CN111925155A - In-situ heat-regenerated asphalt mixture, preparation method and long-road-age pavement construction method - Google Patents
In-situ heat-regenerated asphalt mixture, preparation method and long-road-age pavement construction method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
- E01C7/182—Aggregate or filler materials, except those according to E01C7/26
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Architecture (AREA)
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Abstract
The invention provides a hot in-place recycling asphalt mixture, which comprises a mixture of a component A and a component B; wherein the component A comprises 15-30 parts by weight of hot-mix asphalt mixture; the component B comprises 70-85 parts by weight of asphalt pavement reclaimed materials, a regenerant and styrene-butadiene latex; wherein the weight ratio of the asphalt pavement reclaimed materials to the regenerant is 100: 2.5-100: 4; the weight ratio of the asphalt pavement reclaimed materials to the styrene-butadiene latex is 100: 3-100: 5. the invention also provides a preparation method of the in-situ heat regeneration asphalt mixture and a construction method of long-road-age pavements. According to the in-situ heat regeneration asphalt mixture, on the premise that the usage amount of asphalt pavement reclaimed materials in the in-situ heat regeneration asphalt mixture is high, the high temperature resistance and the fatigue resistance of the in-situ heat regeneration asphalt mixture are improved; after the styrene-butadiene rubber latex is constructed on the road surface, the early rutting phenomenon of the regenerated road surface caused by the addition of the regenerant is reduced by the addition of the styrene-butadiene rubber latex.
Description
Technical Field
The invention relates to the field of road engineering materials, in particular to an in-situ thermal regeneration asphalt mixture, a preparation method and a long-road-age pavement construction method.
Background
In recent years, the road engineering industry in China is unprecedentedly developed. The total mileage of the expressway in China is listed as the first in the world. According to statistics, the total highway mileage of China reaches 484.65 kilometers by 2018, wherein the highway mileage is 14.26 kilometers, and more than ninety percent of the highway is the asphalt pavement.
At present, the design service life of the asphalt pavement of the expressway is usually 15 years, and roads built in early stage gradually enter the major and middle repair stages. However, the maintenance mode of asphalt pavement in China is mainly milling and re-paving, so that a large amount of pavement milling materials are generated every year in the maintenance process, resource waste is caused, and the natural environment is polluted.
The regeneration and utilization of asphalt pavement is characterized by that the old asphalt pavement is undergone the processes of digging, recovering, crushing and screening, then mixed with regenerant, new asphalt material and new aggregate to form a mixture, and then laid on the pavement again. The asphalt mixture thermal regeneration technology can ensure certain pavement performance and recycle the waste pavement materials, effectively solves the problems of resource waste, stone shortage and environmental pollution, and has wide development prospect. Among them, the hot in-place recycling technology is concerned by road workers because of the advantages of fast construction progress, high recycling ratio of old materials, economy, environmental protection, resource saving and the like.
However, due to the high blending ratio of the old materials in the existing in-situ thermal regeneration and the continuous increase of the service life of the pavement, the traditional regeneration mode adopted for the pavement with long road age (usually about 15 years) is easy to cause the instability of the service performance of the pavement and the attenuation of the fatigue resistance performance, and the problem of the performance attenuation can be solved by increasing the blending amount of the regenerant, but the risk of the early rutting of the regenerated pavement can be increased.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the hot-in-place recycling asphalt mixture for long-road-age pavements, which improves the high temperature resistance and fatigue resistance of the hot-in-place recycling asphalt mixture on the premise of high usage amount of asphalt pavement recycling materials in the hot-in-place recycling asphalt mixture, and reduces the occurrence of early rutting phenomenon of the recycling pavements caused by the addition of a recycling agent after being constructed on the road pavements.
In order to achieve the above object, the present invention is achieved by the following technical solutions.
The invention provides an in-situ hot recycled asphalt mixture for long-road-age pavements, which comprises a mixture of a component A and a component B; wherein,
the component A comprises 15-30 parts by weight of hot-mix asphalt mixture;
the component B comprises 70-85 parts by weight of asphalt pavement reclaimed materials, a regenerant and styrene-butadiene latex; wherein the weight ratio of the asphalt pavement reclaimed materials to the regenerant is 100: 2.5-100: 4; the weight ratio of the asphalt pavement reclaimed materials to the styrene-butadiene latex is 100: 3-100: 5.
preferably, the hot mix asphalt mixture comprises a mixture of asphalt and aggregate; the regenerant is used for hot mixing.
The second purpose of the invention is to provide a method for preparing an in-situ hot recycling asphalt mixture, which comprises the following steps:
s11, respectively preheating the asphalt and the aggregate, mixing under a heating condition and stirring to obtain a component A;
s12, preheating the recycled asphalt pavement material, mixing the recycled asphalt pavement material with a regenerant and styrene-butadiene latex under a heating condition, and stirring to obtain a component B;
and S13, mixing the component A and the component B under the heating condition and stirring to obtain the hot-in-place recycled asphalt mixture.
Preferably, the preheating temperature of the asphalt in the step S11 is 150-170 ℃, and the preheating temperature of the aggregate is 170-210 ℃; in step S11, the mixing temperature of the asphalt and the aggregate is 150-170 ℃.
Preferably, the preheating temperature of the recycled asphalt pavement material in the step S12 is 112-138 ℃; in step S12, the mixing temperature is 112 to 138 ℃.
Preferably, in step S12, the recycling agent is added to the preheated recycled asphalt pavement under heating and then stirred, and then the styrene-butadiene latex is added and mixed and stirred.
Preferably, the mixing temperature in step S13 is 112 ℃ to 138 ℃.
The third purpose of the invention is to provide a construction method of a long road age pavement, which comprises the following steps:
s31, preheating the asphalt pavement;
s32, heating and milling the preheated asphalt pavement, adding a regenerant and styrene-butadiene latex into the milled asphalt pavement reclaimed material, and stirring to form a first component;
s33, sprinkling a hot-mix asphalt mixture as a second component on the first component formed in the step S32, heating, dehumidifying and stirring to form the hot-in-place recycling asphalt mixture;
and S34, spreading the hot in-place recycled asphalt mixture on the road surface, and compacting.
Preferably, the step S32 specifically includes heating and milling the preheated pavement by using a heating and milling machine, adding a regenerant into the milled asphalt pavement reclaimed material, stirring and gathering, adding styrene-butadiene latex into the gathered material, and stirring; the heating and dehumidifying in the step S33 specifically includes spreading a mixture of the first component and the second component on a road surface, and drawing grooves while heating the surface of the spread material by using a heater provided with pear hooks.
Preferably, the method further comprises a pavement crack pretreatment step before the pavement is preheated, and the method comprises the following steps:
s21, cleaning the asphalt pavement;
s22, determining and marking the crack position; milling and milling two sides of the crack in a layering manner; milling lengths of two sides of the upper surface layer crack are longer than those of two sides of the middle surface layer crack;
s23, cleaning the middle surface layer milling part, spreading emulsified asphalt, and paving self-adhesive polyester glass fiber cloth after emulsion breaking of the emulsified asphalt;
and S24, filling asphalt concrete into the middle surface layer and the upper surface layer in sequence, and compacting.
Compared with the prior art, the invention has the beneficial effects that:
according to the hot in-place recycling asphalt mixture for the long-road-age road surface, the asphalt road surface reclaimed material is mixed with the recycling agent and the styrene-butadiene latex, so that on the premise of ensuring that the using amount of the asphalt road surface reclaimed material is high, the performances of the asphalt in the asphalt road surface reclaimed material, such as the colloid structure, the rheological property, the crack resistance and the durability, are improved through the recycling agent, the early rutting phenomenon of the recycled road surface caused by the addition of the recycling agent is improved through the addition of the styrene-butadiene latex, the high temperature resistance and the fatigue resistance of the hot in-place recycling asphalt mixture are improved through the combined action of the recycling agent and the styrene-butadiene latex, and the hot in-place recycling asphalt mixture can be applied to.
The construction method of the long road-age pavement provided by the invention is easy to operate, the regenerant and the styrene-butadiene latex are easy to store, the regenerant and the styrene-butadiene latex are convenient to add into the recycled asphalt pavement, and the construction is simple and convenient.
The foregoing description is only an overview of the technical solutions of the present invention, and some embodiments are described in detail below in order to make the technical solutions of the present invention more clearly understood and to implement the technical solutions according to the content of the description. Specific embodiments of the present invention are given in detail by the following examples.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow chart of a method of preparing a hot in-place recycled asphalt mixture according to the present invention;
FIG. 2 is a flow chart of a long-age road construction method according to an embodiment of the present invention;
fig. 3 is a flow chart of a pavement crack preprocessing method of a long-age pavement construction method according to an embodiment of the present invention.
Detailed Description
In order that the invention described herein may be more fully understood, the following examples are set forth. It should be understood that these examples are for illustrative purposes only and are not to be construed as limiting the invention in any way.
The invention provides an in-situ hot recycled asphalt mixture for long-road-age pavements, which comprises a mixture of a component A and a component B; wherein,
the component A comprises 15-30 parts by weight of hot-mix asphalt mixture;
the component B comprises 70-85 parts by weight of asphalt pavement reclaimed materials, a regenerant and styrene-butadiene latex; wherein the weight ratio of the asphalt pavement reclaimed materials to the regenerant is 100: 2.5-100: 4; the weight ratio of the asphalt pavement reclaimed materials to the styrene-butadiene latex is 100: 3-100: 5.
long road age pavement typically means a road age of 15 years or close to 15 years, such as 14 years, 15 years or more than 15 years. The asphalt comprises oil, colloid, and asphaltene. The oil comprises saturated components and aromatic components, so that the asphalt has fluidity; the colloid enables the asphalt to have certain plasticity, flowability and cohesiveness; the asphaltene is the highest molecular weight component in the asphalt, so that the asphalt has certain binding power, viscosity and temperature stability. In the use process of the asphalt pavement, due to the action of various natural factors, various components in the asphalt pavement material are oxidized, so that the physicochemical property or the mechanical property of the asphalt is irreversibly changed; in addition, traffic loads in automobiles can also cause irreversible plastic deformation of the asphalt, which in turn can lead to structural failure and, ultimately, to the gradual, brittle and aging of the pavement. With the use of the road surface, the softening point and viscosity of the asphalt in the road surface increase, and the penetration and ductility of the asphalt decrease. And long-road-age pavements are used for a long time, and asphalt pavements are aged for a long time and have larger performance reduction range.
With the increase of the doping amount of the recycled asphalt pavement material, the problems of fatigue cracks and temperature cracks under the action of repeated load of the formed recycled pavement in final construction can be caused, and the performance of the formed recycled pavement can be improved and the temperature cracks can be reduced by mixing the recycling agent, the styrene-butadiene latex and the recycled asphalt pavement material. The component B comprises an asphalt pavement reclaimed material, a regenerant and styrene-butadiene latex. The regenerant contains saturated components and aromatic components, the asphalt in the asphalt pavement reclaimed material is recovered to a certain degree through the regenerant, so that the viscosity of the asphalt with increased viscosity is reduced, the fluidity of the asphalt in a regenerated asphalt mixture on site is increased, the asphalt is changed into a soft plastic state from a brittle state, and agglomerated asphaltene is dissolved and dispersed in oil, so that the aims of adjusting the colloid structure of the asphalt, improving the rheological property of the asphalt, improving the crack resistance and durability of the asphalt and improving the coating property of aggregates are achieved, and the asphalt pavement reclaimed material has certain pavement performance for being paved on a road again.
Adding styrene-butadiene latex, and enabling part of asphalt to enter a rubber network structure of the styrene-butadiene latex to form a blending structure; the styrene-butadiene latex is distributed in asphalt in a particle size of 2-5 microns to form an embedded structure, and in the dispersing process of the styrene-butadiene latex particles, the styrene-butadiene latex has large dispersity, large specific surface area and high surface energy, so that the asphalt is absorbed on the surfaces of the styrene-butadiene latex particles, an adsorption layer is formed on the surfaces of the styrene-butadiene latex particles, the combination between the styrene-butadiene latex particles and two phases of the asphalt is facilitated, and the styrene-butadiene latex particles are not easy to separate from the asphalt. The synergistic effect of a plurality of styrene-butadiene latex particles ensures that the blend is not easy to damage under the action of external force. After the styrene-butadiene latex is dispersed in the asphalt of the asphalt pavement reclaimed material, the styrene-butadiene latex is hard at low temperature and relatively soft, so that the deformation and stretching of the styrene-butadiene latex particles play a certain toughening role under the action of an external force, the brittleness of the whole material of the component B is reduced, and the low-temperature performance is improved. Meanwhile, the molecular weight of the styrene-butadiene latex is large, so that the average molecular weight of the modified asphalt is increased and the elasticity is enhanced after the styrene-butadiene latex is doped into the asphalt of the asphalt pavement reclaimed material, and the macromolecules of the styrene-butadiene latex play a winding role in the asphalt to block the flow of asphalt molecules, thereby enhancing the high-temperature performance of the asphalt. In addition, the styrene-butadiene latex is a linear polymer material, the polymers are combined through Van der Waals force, although the molecular chain contains benzene rings which can increase the torsional resistance, the intermolecular distance is larger, and the butadiene chain segments contain flexibility, so that the B component has larger deformation resistance after the styrene-butadiene latex is added, and the viscosity toughness and toughness are improved, namely the styrene-butadiene latex is used as a modifier in the B component. In addition, the addition of the regenerant can cause early rutting of the regenerated pavement to a certain extent, and the addition of the styrene-butadiene latex can reduce the occurrence probability of the early rutting of the regenerated pavement.
In one embodiment, the hot mix asphalt mixture comprises a mixture of asphalt and aggregate. The aggregate comprises coarse aggregate, fine aggregate and mineral powder, and the specific composition and weight ratio of the asphalt and the aggregate are determined according to the components and weight ratio of the asphalt mixture of the currently maintained long-road-age pavement.
In one embodiment, the regenerant is a hot-mix regenerant, has good heat resistance, and is commercially available, and the hot-mix regenerant includes, but is not limited to, RA1, RA5, RA25, RA75, RA250, RA500, and tall oil fatty acid and derivatives thereof. Further, the regenerant is liquid at normal temperature. In one embodiment, the regenerant comprises saturates, aromatics, colloids and asphaltenes, and is added into the asphalt pavement reclaimed material, and the regenerant permeates into old asphalt of the asphalt pavement reclaimed material to improve the content of each component of the saturates, the aromatics, the colloids and the asphaltenes in the old asphalt, so that partial performance of the asphalt pavement reclaimed material can be recovered to a certain degree.
The invention also provides a preparation method of the in-situ hot recycled asphalt mixture, which comprises the following steps as shown in figure 1:
s11, respectively preheating the asphalt and the aggregate, mixing and stirring under a heating condition to obtain a component A, namely a hot-mix asphalt mixture; the specific components and weight ratio of the asphalt and the aggregate in the hot-mix asphalt mixture can be determined according to the asphalt pavement material of the long-road-age pavement needing to be maintained at present;
s12, preheating the recycled asphalt pavement material, mixing the recycled asphalt pavement material with a regenerant and styrene-butadiene latex under a heating condition, and stirring to obtain a component B; the regenerant is used for recovering the aged asphalt in the asphalt pavement reclaimed material to a certain performance, adjusting the colloid structure of the asphalt and improving the rheological property of the asphalt; the styrene-butadiene latex is used for improving the toughness, elasticity and high temperature resistance of the obtained component B;
and S13, mixing the component A and the component B under the heating condition and stirring to obtain the hot-in-place recycled asphalt mixture.
In one embodiment, the preheating temperature of the asphalt in step S11 is 150-170 ℃, the preheating temperature of the aggregate is 170-210 ℃, and the asphalt and the aggregate are respectively preheated for subsequent mixing, thereby shortening the mixing time. In the step S11, the mixing temperature of the asphalt and the aggregate is 150-170 ℃ to obtain the hot-mixed asphalt mixture, and the strength, the high-temperature stability and the fatigue resistance of the hot-mixed asphalt mixture are superior to those of the conventional in-situ hot-recycled asphalt mixture.
In one embodiment, the preheating temperature of the recycled asphalt pavement material in step S12 is 112 ℃ to 138 ℃, and since the amount of the recycled asphalt pavement material is much larger than that of the recycling agent and the styrene-butadiene latex, and the heating time of the recycled asphalt pavement material is relatively long, the recycled asphalt pavement material is preheated for subsequent mixing with the recycling agent and the styrene-butadiene latex. In the step S12, the mixing temperature is 112-138 ℃, so that the reclaimed asphalt pavement can be preheated, and the performance of the regenerant is prevented from being influenced by overhigh temperature under the heating condition.
In one embodiment, in step S12, the recycling agent is added to the preheated recycled asphalt pavement under heating and then stirred, and then the styrene-butadiene latex is added and mixed and stirred. The recycling agent is added into the recycled asphalt pavement material, the recycled asphalt pavement material is improved through the recycling agent, and the recycled asphalt pavement material is softened and then is conveniently mixed with styrene-butadiene latex. The regenerant fills gaps of the recycled asphalt pavement materials and improves the water resistance of the recycled asphalt pavement materials. In another embodiment, in step S12, the styrene-butadiene latex is added to the preheated recycled asphalt pavement under heating and then stirred, and then the recycling agent is added and mixed and stirred. Further, a regenerant and a styrene-butadiene latex were applied to the asphalt pavement reclaimed material by a sprayer, respectively. The contact area of the regenerant, the butylbenzene and the recycled asphalt pavement material can be increased by spraying, and the mixing is accelerated.
In one embodiment, the mixing temperature in step S13 is 112 ℃ to 138 ℃ for stirring and mixing.
The invention also provides a construction method of the long road age pavement, which comprises the following steps as shown in figure 2:
s31, preheating the asphalt pavement to soften the asphalt pavement; in one embodiment, the asphalt pavement to be maintained is heated to 160-190 ℃ by a thermal regeneration heater so as to soften the asphalt pavement;
s32, heating and milling the preheated asphalt pavement, adding a regenerant and styrene-butadiene latex into the milled asphalt pavement reclaimed material, and stirring to form a first component;
s33, spreading a hot-mix asphalt mixture as a second component on the first component formed in the step S32, heating for dehumidification, and stirring to form a hot-in-place recycled asphalt mixture;
and S34, paving the in-situ hot recycled asphalt mixture on the road surface, and compacting to form the recycled road surface. The addition of the styrene-butadiene latex and the regenerant is beneficial to compaction of the pavement, the compaction mode can be determined according to the aging degree of the original asphalt pavement, and the void ratio of the hot in-place recycled asphalt mixture of the compacted recycled pavement is controlled to be 4-6%.
The first component formed in step S32 includes an asphalt pavement reclaimed material, a recycling agent, and styrene-butadiene latex, which is the component B in the above-mentioned hot-in-place recycled asphalt mixture. The second component formed in step S33 is a hot-mix asphalt mixture, that is, the component a in the hot-in-place recycled asphalt mixture. During on-site construction, the first component comprises 70-85 parts by weight of an asphalt pavement reclaimed material, a regenerant and styrene-butadiene latex; wherein the weight ratio of the asphalt pavement reclaimed materials to the regenerant is 100: 2.5-100: 4; the weight ratio of the asphalt pavement reclaimed materials to the styrene-butadiene latex is 100: 3-100: 5. the second component comprises 15-30 parts by weight of hot-mix asphalt mixture; further, the hot mix asphalt mixture includes a mixture of asphalt and aggregate.
In an embodiment, step S32 specifically includes heating and milling the preheated pavement with a heating and milling machine, adding the recycling agent to the milled asphalt pavement recycled material, stirring and gathering, adding the styrene-butadiene latex to the gathered material, and stirring. Firstly, spraying a regenerant on the surface of the reclaimed asphalt pavement material, improving the reclaimed asphalt pavement material through the regenerant, and softening the reclaimed asphalt pavement material to facilitate subsequent mixing with styrene-butadiene latex. Further, respectively applying a regenerant and styrene-butadiene latex to the asphalt pavement reclaimed materials through a sprayer; the regenerant and the styrene-butadiene latex are easy to add and store and can be stored at normal temperature. The contact area of the regenerant, the butylbenzene and the recycled asphalt pavement material can be increased by spraying, and the mixing is accelerated. Further, step S32 specifically includes the steps of: and (4) heating, milling and loosening the asphalt pavement preheated in the step S31 according to a certain depth by using a heating milling machine, milling to obtain an asphalt pavement reclaimed material, uniformly spraying a regenerant on the surface of the asphalt pavement reclaimed material, stirring and gathering, uniformly spraying styrene-butadiene latex in the gathered material, and stirring. In another embodiment, step S32 specifically includes heating and milling the preheated pavement with a heating and milling machine, adding styrene-butadiene latex to the milled asphalt pavement reclaimed material, stirring and gathering, adding the regenerant to the gathered material, and stirring. In addition, in order to avoid the premature emulsion breaking (i.e. the separation of the oil phase and the water phase) of the latex during the construction process, a pre-test laying stage can be arranged, and the proportion of water in the styrene-butadiene latex can be properly adjusted in the pre-test laying stage, so as to prevent the premature emulsion breaking of the styrene-butadiene latex caused by the overhigh proportion of water and influence the compaction effect of the regenerated pavement.
Further, the heating and dehumidifying in step S33 includes spreading the mixture of the first component and the second component on the road surface, drawing grooves while heating the surface of the spread material by using a heater with pear hooks, and drawing a plurality of grooves on the spread material by using the pear hooks of the heater, so as to increase the external surface area of the material, accelerate heating, and facilitate moisture evaporation.
In one embodiment, the method further comprises a pavement crack pretreatment step before preheating the pavement, as shown in fig. 3, and comprises the following steps:
s21, cleaning the asphalt pavement; when the road surface is wet, cleaning the asphalt pavement after the road surface is dried;
s22, determining and marking the crack position, and marking the crack position for subsequent repair; milling and milling two sides of the crack in a layering manner; milling lengths of two sides of the crack of the upper layer are longer than those of two sides of the crack of the middle layer; specifically, the lane width is 3.75 meters, the milling is carried out in layers on two sides of the crack by taking the crack as the center, the milling is carried out on two sides of the crack on the upper layer by 1.25 meters respectively, and the milling is carried out on two sides of the crack on the middle layer by 0.75 meters respectively;
s23, cleaning the middle surface layer milling part, spreading emulsified asphalt, and paving self-adhesive polyester glass fiber cloth after emulsion breaking of the emulsified asphalt; specifically, cleaning two sides of a middle surface layer crack within a range of 1.5 meters, removing dust, mortar, oil stain, clay blocks and the like, spreading emulsified asphalt on the middle surface layer milling part, and manually laying self-adhesive polyester glass fiber cloth after emulsion breaking of the emulsified asphalt; when the self-adhesive polyester glass fiber cloth is laid, the self-adhesive polyester glass fiber cloth is ensured to be flat and without folds, and if folds exist, the folds are cut at the folds and laid flat;
and S24, filling asphalt concrete into the middle surface layer and the upper surface layer in sequence, and compacting. In particular, AC-13 or SMA-13 dense asphalt concrete can be filled.
In order to illustrate the invention herein, various specific examples are set forth below. It should be understood that these examples are for illustrative purposes only and are not to be construed as limiting the invention in any way.
Example 1
The invention provides an in-situ hot recycled asphalt mixture for long-road-age pavements, which comprises a mixture of a component A and a component B; wherein,
the component A comprises 15.75 parts by weight of hot-mix asphalt mixture; wherein the hot-mix asphalt mixture comprises 0.75 weight part of asphalt and 15 weight parts of aggregate;
the component B comprises 85 parts by weight of asphalt pavement reclaimed materials, 2.17 parts by weight of regenerant and 3.4 parts by weight of styrene-butadiene latex.
Example 2
The invention provides an in-situ hot recycled asphalt mixture for long-road-age pavements, which comprises a mixture of a component A and a component B; wherein,
the component A comprises 26.25 parts by weight of hot-mix asphalt mixture; wherein the hot-mix asphalt mixture comprises 1.25 parts by weight of asphalt and 25 parts by weight of aggregate;
the component B comprises 75 parts by weight of asphalt pavement reclaimed materials, 1.91 parts by weight of regenerant and 3 parts by weight of styrene-butadiene latex.
Example 3
The invention provides an in-situ hot recycled asphalt mixture for long-road-age pavements, which comprises a mixture of a component A and a component B; wherein,
the component A comprises 31.5 parts by weight of hot-mix asphalt mixture; wherein the hot-mix asphalt mixture comprises 1.5 parts by weight of asphalt and 30 parts by weight of aggregate;
the component B comprises 70 parts by weight of asphalt pavement reclaimed materials, 1.79 parts by weight of regenerant and 2.8 parts by weight of styrene-butadiene latex.
Example 4
The preparation method of the in-situ regeneration asphalt mixture comprises the following steps: heating the asphalt, the aggregate and the reclaimed asphalt pavement material weighed according to the corresponding weight parts respectively at 125 ℃, 160 ℃ and 190 ℃. Taking a mixing pot, putting the preheated asphalt and the aggregates into the mixing pot, uniformly stirring at the temperature of 160 ℃, stirring for 60 seconds to obtain a component A, and putting the component A into an oven for heat preservation. Respectively weighing the regenerant and the styrene-butadiene latex according to the corresponding weight; taking a new mixing pot, putting the heated recycled asphalt pavement material into the new mixing pot, spraying the regenerant into the mixing pot, uniformly stirring at 125 ℃, stirring for 60 seconds, adding the styrene-butadiene latex into the mixing pot, and stirring at 125 ℃ for 60 seconds to obtain the component B. And mixing and stirring the component A and the component B which are well insulated at 125 ℃ to obtain the in-situ heat regeneration asphalt mixture.
Example 5
Verifying the effect of the regenerant on the performance of the long-term aged asphalt
Selecting an asphalt pavement with the age of 15 years, preheating the asphalt pavement with the age of 15 years, then screening the asphalt pavement reclaimed materials obtained by heating, milling and planing, determining the gradation of the asphalt pavement, extracting the reclaimed asphalt from the asphalt pavement reclaimed materials, adding a regenerant with the mixing amount of 2-4% of the weight of the reclaimed asphalt into the old asphalt, stirring at 145-160 ℃ for 5 minutes (determining the heating temperature according to the aging degree of the asphalt), and preserving heat for 30 minutes to ensure that the reclaimed asphalt is fully fused; wherein the regenerant is RA25 regenerant for hot mixing. The performance tests of the recycled asphalt, the asphalt mixed with the regenerant and the newly purchased asphalt show that the results are shown in the table I.
Watch 1
As can be seen from the table I, the recycling agent can soften the recycled asphalt, the needle penetration, ductility, softening point and viscosity of the recycled asphalt are improved, and the performances of the recycled asphalt improved by the recycling agent are slightly weaker than those of newly purchased asphalt.
Comparative example 1
The conventional in-situ hot-recycling asphalt mixture comprises a mixture of a component C and a component D; wherein,
the component C comprises 15.75 parts by weight of hot-mix asphalt mixture; wherein the hot-mix asphalt mixture comprises 0.75 weight part of asphalt and 15 weight parts of aggregate;
the component B comprises 85 parts by weight of asphalt pavement reclaimed materials and 2.55 parts by weight of regenerant.
Comparative example 2
The conventional in-situ hot-recycling asphalt mixture comprises a mixture of a component C and a component D; wherein,
the component C comprises 26.25 parts by weight of hot-mix asphalt mixture; wherein the hot-mix asphalt mixture comprises 1.25 parts by weight of asphalt and 25 parts by weight of aggregate;
the component B comprises 75 parts by weight of asphalt pavement reclaimed materials and 2.25 parts by weight of regenerant.
Comparative example 3
The conventional in-situ hot-recycling asphalt mixture comprises a mixture of a component C and a component D; wherein,
the component C comprises 31.5 parts by weight of hot-mix asphalt mixture; wherein the hot-mix asphalt mixture comprises 1.5 parts by weight of asphalt and 30 parts by weight of aggregate;
the component B comprises 70 parts by weight of asphalt pavement reclaimed materials and 2.1 parts by weight of regenerant.
Example 6
The in-situ hot recycling asphalt mixture prepared by the preparation method of example 4 in example 1, example 2 and example 3; the conventional in-situ hot recycling asphalt mixture prepared by the preparation method of the example 4 according to the comparative examples 1, 2 and 3 has zero addition amount of the styrene-butadiene latex in the comparative examples 1, 2 and 3 in the preparation process; the regenerants used in examples 1, 2, 3, 1, 2 and 3 are RA25 regenerants for hot-mix. And compacting the in-situ hot recycled asphalt mixture to obtain a corresponding test piece, and controlling the porosity of the compacted test piece to be 5%. The test pieces were used for performance testing, and the results are shown in table two.
Watch two
Comparative example 1, comparative example 2 and comparative example 3 no styrene-butadiene latex was added, and the amounts of the regenerants added in comparative example 1, comparative example 2 and comparative example 3 were slightly more than those in example 1, example 2 and example 3, respectively. The standard dynamic creep test is used for verifying the high-temperature performance of six groups of test pieces, the freeze-thaw splitting strength ratio is used for verifying the water stability of each test piece, the low-temperature bending strain is used for verifying the low-temperature performance of the six groups of test pieces, and the semi-circle bending fatigue life is used for verifying the fatigue life of the six groups of test pieces. As can be seen from the second table, the four performance conditions of the hot in-place recycling asphalt mixture of the invention all reach the specification requirements, and the high temperature performance, the low temperature performance and the fatigue life of the test pieces of the examples 1, 2 and 3 are respectively better than those of the test pieces of the comparative examples 1, 2 and 3. In the examples 1, 2 and 3, the pavement performance is still better than that of the conventional hot-in-place recycling mixture under the condition that the doping amount of the asphalt pavement recycling material is increased, the required amount of the recycling agent of the asphalt pavement recycling material can be properly reduced by adding the styrene-butadiene latex, and the high temperature resistance and the fatigue resistance of the hot-in-place recycling asphalt mixture are ensured while the addition amount of the recycling agent is reduced.
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of adaptation of the invention, and further modifications can be easily implemented by those skilled in the art, so that the invention is not limited to the specific details and the examples shown herein, without departing from the general concept defined by the claims and the scope of equivalents.
Claims (10)
1. The in-situ heat regeneration asphalt mixture for the long-road-age pavement is characterized by comprising a mixture of a component A and a component B; wherein,
the component A comprises 15-30 parts by weight of hot-mix asphalt mixture;
the component B comprises 70-85 parts by weight of asphalt pavement reclaimed materials, a regenerant and styrene-butadiene latex; wherein the weight ratio of the asphalt pavement reclaimed materials to the regenerant is 100: 2.5-100: 4; the weight ratio of the asphalt pavement reclaimed materials to the styrene-butadiene latex is 100: 3-100: 5.
2. a hot in place recycled asphalt mix for long-age roadways as claimed in claim 1, wherein said hot mix asphalt mix comprises a mixture of asphalt and aggregate; the regenerant is used for hot mixing.
3. The preparation method of the in-situ hot recycling asphalt mixture is characterized by comprising the following steps of:
s11, respectively preheating the asphalt and the aggregate, mixing under a heating condition and stirring to obtain a component A;
s12, preheating the recycled asphalt pavement material, mixing the recycled asphalt pavement material with a regenerant and styrene-butadiene latex under a heating condition, and stirring to obtain a component B;
s13, mixing the component A and the component B under the heating condition and stirring to obtain the in-situ heat-regeneration asphalt mixture as claimed in claim 1.
4. The method for preparing hot in-place recycling asphalt mixture according to claim 3, wherein the preheating temperature of the asphalt in the step S11 is 150-170 ℃, and the preheating temperature of the aggregate is 170-210 ℃; in step S11, the mixing temperature of the asphalt and the aggregate is 150-170 ℃.
5. The method for preparing an in-situ hot recycled asphalt mixture as claimed in claim 3, wherein the preheating temperature of the recycled asphalt pavement material in the step S12 is 112-138 ℃; in step S12, the mixing temperature is 112 to 138 ℃.
6. The method of claim 3, wherein in step S12, the recycling agent is added to the preheated recycled asphalt pavement under heating and then stirred, and then the styrene-butadiene latex is added to mix and stir.
7. The method for preparing hot in place recycling asphalt mixture according to claim 3, wherein the mixing temperature in the step S13 is 112-138 ℃.
8. A construction method of a long road age pavement is characterized by comprising the following steps:
s31, preheating the asphalt pavement;
s32, heating and milling the preheated asphalt pavement, adding a regenerant and styrene-butadiene latex into the milled asphalt pavement reclaimed material, and stirring to form a first component;
s33, sprinkling a hot-mix asphalt mixture as a second component on the first component formed in the step S32, heating, dehumidifying and stirring to form the hot-in-place recycling asphalt mixture as claimed in claim 1;
and S34, spreading the hot in-place recycled asphalt mixture on the road surface, and compacting.
9. The construction method of the long-road-age pavement according to claim 8, wherein the step S32 specifically comprises heating and milling the preheated pavement by using a heating and milling machine, adding a regenerant into the milled recycled asphalt pavement, stirring and gathering, adding styrene-butadiene latex into the gathered material, and stirring; the heating and dehumidifying in the step S33 specifically includes spreading a mixture of the first component and the second component on a road surface, and drawing grooves while heating the surface of the spread material by using a heater provided with pear hooks.
10. The long-age pavement construction method according to claim 8, further comprising a pavement crack preprocessing step before preheating the pavement, comprising the steps of:
s21, cleaning the asphalt pavement;
s22, determining and marking the crack position; milling and milling two sides of the crack in a layering manner; milling lengths of two sides of the upper surface layer crack are longer than those of two sides of the middle surface layer crack;
s23, cleaning the middle surface layer milling part, spreading emulsified asphalt, and paving self-adhesive polyester glass fiber cloth after emulsion breaking of the emulsified asphalt;
and S24, filling asphalt concrete into the middle surface layer and the upper surface layer in sequence, and compacting.
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