Classifications

• • 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
  • E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
  • E01C7/14—Concrete paving
  • E01C7/142—Mixtures or their components, e.g. aggregate
• • 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
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
  • C04B28/021—Ash cements, e.g. fly ash cements ; Cements based on incineration residues, e.g. alkali-activated slags from waste incineration ; Kiln dust cements
• • 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
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
  • C04B28/04—Portland cements
• • 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
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W30/00—Technologies for solid waste management
  • Y02W30/50—Reuse, recycling or recovery technologies
  • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

• Hydraulic road binder comprising fly ash from biomass, material for pavement bedding and soils treated with said binder
• the present invention relates to the field of hydraulic road binders (LHR) and materials comprising.
• LHR hydraulic road binders
• the present invention relates to materials and soils treated with hydraulic road binders for the base and subgrade of the roadway, such as road gravel, made up of natural and / or recycled aggregates and sands (asphalt aggregates bituminous, crushed concrete, incineration bottom ash) and natural soils (silt, sands).
• road gravel made up of natural and / or recycled aggregates and sands (asphalt aggregates bituminous, crushed concrete, incineration bottom ash) and natural soils (silt, sands).
• Standardized hydraulic road binders (LHR) and cements (CEM) are main constituents of materials used in public works, civil engineering and construction.
• CEM cements
• the manufacturing processes of these usual binders such as traditional Portland cement (CEM I) generate a considerable CO2 emission. Therefore, alternative hydraulic binders that emit less CO2 than Portland cement have been developed and are still being investigated.
• by-products from other industries can be used as the main constituent of road hydraulic binder.
• Granulated and ground blast furnace slag resulting from the manufacture of cast iron from iron ore at high temperature (1250 ° C), has been used for many years in hydraulic binders and CEM II standardized cements and CEM III, in addition to clinker.
• CEM I traditional Portland cement
• granulated and ground LHF in hydraulic binders and cement compositions remains limited since many of them only contain a small proportion of LHF, less than 50%, the rest of the constituents being mainly CEM I which makes it possible to obtain fast setting kinetics and mechanical performance over time.
• the biomass sector is broken down into three sub-sectors, segmented according to size and the resulting energy production: individual wood heating, biomass boilers and biomass cogeneration.
• One result of these developments is the future increase in the production of biomass ash that it would be advantageous to be able to recover.
• Sub-hearth ash is granular while fly ash is in the form of powder.
• biomass fly ash is not currently valued as an alternative hydraulic binder to Portland cement, because it is not considered hydraulic, that is to say of ability to set and harden in presence of water.
• the Applicants have been able, surprisingly, to incorporate fly ash from biomass into compositions of hydraulic road binders, in particular intended for the treatment of serious roads and soils, up to high proportions.
• the present invention relates to a hydraulic road binder composition
• a hydraulic road binder composition comprising at least 50% by weight of biomass fly ash and at least one other component selected from the group consisting of slaked lime, quicklime, source materials of sulphates such as, for example, gypsum and desulphogypsum, granulated and ground blast furnace slag, papermaking ash, Portland cement, ground pozzolans, crushed calcined shales, crushed calcined clays, limestone filler, alone or in mixed.
• the invention also relates to a treated material for a pavement bed comprising said composition of road hydraulic binder and a mixture of aggregates and sand, natural and / or recycled.
• the invention also relates to a method of manufacturing said treated material, comprising a step of cold mixing, generally at a temperature between 10 ° C and 40 ° C of said road hydraulic binder composition and natural and / or recycled aggregates and sand.
• the invention also relates to the use of biomass ash in compositions for hydraulic road binders.
• Figure 1 is a bar diagram representing the compressive strength as a function of the curing time of different compositions of hydraulic road binders according to the invention.
• Figure 2 is a bar diagram representing the compressive strength on standardized mortars after 56 days of curing different compositions of hydraulic road binders according to the invention.
• Figure 3 is a graph showing the compressive strength as a function of the curing time of different materials treated for pavement bedding according to the invention.
• Figure 4 is a graph showing the compressive strength as a function of the curing time of different materials treated for pavement bed according to the invention.
• FIG. 5 is a bar diagram representing the compressive strength as a function of the curing time of a soil treated with a hydraulic road binder composition according to the invention. Detailed description of the invention
• the invention relates to a road hydraulic binder composition
• a road hydraulic binder composition comprising at least 50% by weight of biomass fly ash and at least one other component selected from the group consisting of slaked lime, quicklime, source materials of sulphates such as, for example, gypsum and desulphogypsum, granulated and ground blast furnace slag, papermaking ash, Portland cement, ground pozzolans, crushed calcined shales, crushed calcined clays, limestone filler, alone or in mixture, advantageously chosen from the group consisting of slaked lime, quicklime, sulphate source materials such as for example gypsum and desulphogypsum, granulated and ground blast furnace slag, stationery ash, Portland cement , crushed calcined shale, calcined and crushed clay, alone or in mixture.
• a road hydraulic binder is a material for binding together granular compounds or soil particles by reaction with water so that the final material is cohesive and applicable to the road.
• LFIRs are intended for the treatment of aggregates and soils for the construction of road bases, subgrade and earthworks. .
• biomass denotes any product composed of a plant material originating from agriculture or forestry and which can be used as fuel for the purpose of use. amount of energy it contains as well as the following wastes, used as fuel:
• wood waste which is likely to contain halogenated organic compounds or toxic metals following treatment with wood preservatives or the placement of a coating, including in particular wood waste of this type originating from construction or demolition waste.
• biomass fly ash corresponds to fly ash obtained during the combustion, at at least 850 ° C, of biomass and / or co-combustion, at at least 850 ° C, of biomass and at least one recycled fuel product (PCR) and / or a fuel of fossil origin, such as ashy coal, gas or heavy fuel oil in minority proportions, i.e. less than 15 % in weight.
• PCR recycled fuel product
• source of sulfates means a compound or a material releasing sulfate ions (SO4 2 ' ) in an aqueous medium, such as natural gypsum, desulfogypsum and any other industrial gypsum (phosphogypsum, lactogypsum, etc.).
• the road hydraulic binder composition comprises at least two other components chosen from slaked lime, Portland cement and granulated and ground blast furnace slag.
• the road hydraulic binder composition comprises at least one material which is a source of sulphates, such as gypsum and / or desulphogypsum.
• the road hydraulic binder composition comprises at least two other components chosen from slaked lime, Portland cement and granulated and ground blast furnace slag and comprises at least one source material of sulphates, such as gypsum and / or desulfogypsum.
• the road hydraulic binder composition according to the invention comprises between 55% and 90% by weight of biomass fly ash, advantageously between 60% and 85% by weight and more advantageously between 65% and 80% by weight.
• the road hydraulic binder composition according to the invention can comprise up to 20% by weight of slaked lime, advantageously between 5% and 20% by weight, more advantageously between 10% and 15% by weight.
• the road hydraulic binder composition according to the invention can comprise up to 20% by weight of quicklime, advantageously between 5% and 20% by weight, more preferably between 10% and 15% by weight.
• the road hydraulic binder composition according to the invention can comprise up to 15% of the sulphate source material, advantageously between
• the sulfate source material is chosen from gypsum and desulfogypsum alone or as a mixture.
• the road hydraulic binder composition according to the invention can comprise up to 35% by weight of granulated and ground blast furnace slag, advantageously between 5% and 35% by weight, more advantageously between 10% and 30% by weight. weight.
• the road hydraulic binder composition according to the invention can comprise up to 50% by weight of papermaking ash, preferably between 5% and 50% by weight, more preferably between 10% and 30% by weight.
• the road hydraulic binder composition according to the invention can comprise up to 35% by weight of Portland cement, preferably between 5% and 35% by weight, more preferably between 10% and 30% by weight.
• the road hydraulic binder composition according to the invention can comprise up to 35% by weight of ground pozzolans, advantageously between 5% and 35% by weight, more advantageously between 10% and 30% by weight.
• the hydraulic road binder composition according to the invention can comprise up to 35% by weight of crushed calcined shale, advantageously between 5% and 35% by weight, more advantageously between 10% and 30% by weight.
• the road hydraulic binder composition according to the invention may comprise up to 30% by weight of crushed calcined clays, advantageously between 5% and 30% by weight, more advantageously between 10% and 25% by weight.
• the road hydraulic binder composition according to the invention can comprise up to 35% by weight of limestone filler, preferably between 5% and 35% by weight, more preferably between 10% and 30% by weight.
• the composition for road hydraulic binder according to the invention further comprises one or more of the main and secondary components as defined in standards NF P 15-108, NF EN 13282-1 and NF EN 13282-2.
• the road hydraulic binder composition according to the invention may comprise up to 44% by weight of crystallized ground oxygen converter slag.
• a limestone filler is a material consisting of finely ground limestone and intended to fill the voids left by a granular stack of gravel, chippings and sand.
• the invention also relates to a method of manufacturing the composition of said hydraulic road binder, comprising a step of mixing biomass ash and said at least one other component selected from the group consisting of slaked lime, quicklime , sulphate source materials such as, for example, gypsum and desulphogypsum, granulated and ground blast furnace slag, paper mill ash, Portland cement, ground pozzolans, crushed calcined shales, crushed calcined clays, filler limestone, alone or as a mixture, advantageously used with a production unit for composite products, UPPC N ° 1 - N ° 2 - N ° 3 of Surschiste SA
• the invention also relates to a treated material for a pavement bed comprising said composition of hydraulic road binder according to the invention and a mixture of aggregates and sand, natural and / or recycled.
• the material treated according to the invention can be used in the foundation layer of the road, both as a foundation layer and as a base layer.
• the aggregates and sand of said treated material for pavement base according to the invention consist of at least 80% by weight of recycled asphalt, preferably 100% by weight.
• the recycled asphalt can in particular come from the planing or crushing of the surface layers (rolling, bonding) and / or the base layer of an old pavement.
• the road hydraulic binder composition according to the invention represents between 3.5% and 6% by weight of said treated material for pavement bedding, preferably between 4% and 5% by weight.
• the treated material for pavement base according to the invention further comprises up to 20% by weight of corrective sand.
• Corrector sand is natural and / or recycled sand and serves as a granulometric corrector of the material when the latter does not contain, as it is, sufficient fine particles.
• the materials for pavement bed treated with said hydraulic binder according to the invention have the mechanical strengths corresponding to the standard NF EN 14-227-5 on granular mixtures treated with hydraulic road binders , with a performance class T2, T3 or T4 at 360 days depending on the percentage by weight of said hydraulic binder.
• the invention also relates to a method of manufacturing said treated material comprising a step of cold mixing, advantageously between 10 ° C and 40 ° C, of said hydraulic road binder composition according to the invention and natural aggregates and sand and / or recycled.
• cold is understood to mean the fact of not providing heat energy, in other words, a cold process is a process carried out at the ambient temperature of the place of its implementation.
• the process according to the invention is carried out in a mixing plant.
• the cold mixing of said binder composition and aggregates is carried out in the factory.
• the material obtained is then transported to the site for which it is intended.
• the method according to the invention is carried out directly on site, during the reprocessing of the pavement materials with a dedicated workshop, comprising the spreading of said road hydraulic binder composition according to the invention, the milling of the pavement materials, the mixing, the possible addition of water and the compaction of the treated material.
• the method according to the invention can be implemented with the ARC ® 700 and ARC ® 1000 (Pavement Treatment Workshop 700 and 1000 Cv) of ElFFAGE Route.
• binder composition for soil treatment
• the invention also relates to the use of said hydraulic road binder composition according to the invention in a method for treating soil for carrying out earthworks.
• the use of the road hydraulic binder composition according to the invention can, for example, be made in the context of a method for earthmoving a ground comprising the steps successive following:
• the step of adjusting the water state can consist in mixing the loose soil either with water if it is not wet enough, or with quicklime if it is not wet enough. is too wet.
• the invention also relates to the use of fly ash from biomass in combination with at least one other component chosen from the group consisting of slaked lime, quicklime, source materials of sulphates, blast furnace slag granulated and ground, paper mill ashes, Portland cement, ground pozzolans, crushed calcined shales, crushed calcined clays, limestone filler, alone or as a mixture in compositions of hydraulic road binders.
• the biomass ash is used in combination with at least two other components selected from slaked lime, Portland cement and granulated and ground blast furnace slag.
• Example 1 Hydraulic setting of hydraulic road binder compositions according to the invention
• Hydraulic reactivity tests were carried out on pure binder pastes (road hydraulic binder composition alone mixed with water). Cylindrical test pieces with a diameter of 4 cm and a height of 8 cm were made with the compositions LHR 1, LHR 2, LHR 3 and LHR 4 by adding 65%, 55%, 55% and 50% respectively. by weight of water, to achieve a similar consistency. These test pieces were stored in closed cases at 20 ° C and 90% humidity. After curing times of 14, 28 and 56 days, they were subjected to crushing in simple compression according to standard NF EN 13286-41.
• Example 2 mechanical performance of binders based on biomass ash on standardized mortars
• Example 3 material for pavement bed treated with a hydraulic binder based on biomass ash
• Test pieces of these two materials were made while respecting the Optimum Proctor compaction references Modified to 5% binder according to standard NF EN 13286-2 in order to be able to characterize them with the following standardized tests:
• the pavement foundation materials according to the invention with the applied hydraulic binder dosages, belong to the mechanical performance class T3 from 60 days of cure.
• the moduli of elasticity obtained are less than 10 GPa. They are intermediate between an asphalt mix and a serious cement, making the treated material much less sensitive to transverse cracking, and offering excellent durability over time.
• Example 4 floor for pavement bed treated with a hydraulic binder based on biomass ash
• Test specimens of these two materials were made while respecting the Optimum Proctor compaction references Modified to 5% binder according to standard NF EN 13286-2 in order to be able to characterize them with the following standardized tests:
• the materials for the pavement base according to the invention, with the applied hydraulic binder dosages, belong to the mechanical performance class T1 at 60 days of cure.
• the moduli of elasticity obtained after 60 days of cure are less than 10 GPa.
• Example 5 soil for a pavement sub-layer treated with a binder based on biomass ash
• This example illustrates the treatment of a natural soil classified as B5 according to the NF P 11-300 standard with the LHR binder 4 at 6% by weight, without pretreatment with quicklime.
• the methodology of the formulation studies in the laboratory was applied according to standard NF P 94-102-2.
• Test specimens of this treated soil were made in accordance with the Optimum Proctor Normal compaction references according to standard NF P 94-093 in order to be able to characterize it with the following standardized tests:

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Structural Engineering (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Inorganic Chemistry (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Combustion & Propulsion (AREA)
• Civil Engineering (AREA)
• Architecture (AREA)
• Road Paving Structures (AREA)
• Curing Cements, Concrete, And Artificial Stone (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=72088233

Family Applications (1)

Country Status (3)

Families Citing this family (2)

Family Cites Families (2)

• 2020
  • 2020-04-27 FR FR2004170A patent/FR3109579B1/fr active Active
• 2021
  • 2021-04-27 EP EP21732395.5A patent/EP4143145A1/de active Pending
  • 2021-04-27 WO PCT/FR2021/050729 patent/WO2021219956A1/fr not_active Ceased

Also Published As

Similar Documents

Legal Events