CN100451237C - Materials and Pavement Construction Methods of Bridge Deck Pavement Waterproof System - Google Patents

Abstract

The present invention is material for waterproof bridge surface system and its paving process. The material for waterproof bridge surface system includes: lower closing layer material comprising component A of bisphenol A epoxy resin and toughening agent, component B of modified epoxy curing agent and crushed stone in certain weight proportion; solvent type asphalt rubber comprising AH-70# asphalt, solvent, styrene-butadiene block copolymer, petroleum resin and neoprene; and rubber asphalt sand glue comprising AH-70# asphalt, rosin, styrene-butadiene block copolymer, asphalt modifier, rock asphalt and stone powder. The waterproof bridge surface system has excellent waterproof effect, excellent protection on the bridge structure and other advantages.

Description

Materials and Pavement Construction Methods of Bridge Deck Pavement Waterproof System

1. Technical field

The invention relates to a novel bridge deck pavement waterproof system, and provides materials, preparation and pavement construction method of the waterproof system.

2. Background technology

At present, in most domestic projects, the pavement layer of the bridge deck is only designed according to the wear layer without considering the waterproof effect, which causes water to seep into the gap between the pavement layer and the bridge deck to form dynamic erosion between them, or cause freeze-thaw damage in cold regions, resulting in the failure of the pavement. The layer is separated from the bridge deck, and the bridge deck pavement is damaged early, which not only seriously affects the use effect of high-grade highways, but also causes hidden dangers to driving safety, affects the traffic environment of the road, and increases maintenance costs; on the other hand, water seeps into the bridge deck And in the bridge structure, it will cause premature corrosion of steel bars in the inner plate and beam structure of the structure, carbonization and corrosion of the concrete surface, and a decrease in the bearing capacity of the concrete, which will lead to a decrease in the bearing capacity of the entire bridge structure, and the durability of the bridge will be affected. Foreign experience tells us that if we ignore the effective protection of the bridge structure during bridge construction, we will pay a heavy maintenance price in the later use of the bridge.

In the construction of high-grade highways in China, most of the bridge deck pavement fails to fully consider the requirements of bridge performance. At present, the driving function of some bridges built in the early stage of high-grade highway construction has been reduced, and There are more and more cases of damage to the bridge structure due to water leakage; some bridges built later, although the waterproofing of the bridge deck pavement was considered, but the waterproof bonding performance is poor, it is difficult to achieve the desired effect during construction, and the waterproofing The durability of the layer is poor, and at the same time, insufficient attention is paid to the protection of the bridge structure. Some bridge deck pavement began to appear various diseases shortly after it was opened to traffic, and the disease reappeared after treatment. The maintenance frequency of the bridge deck is high. Chinese patent CN200420007829.6 discloses a steel bridge deck waterproof pavement structure using 3-6mm neoprene as a waterproof layer and paving 25-35mm thick modified asphalt SMA; Chinese patent application number is 200410027199 Disclosed is the use of polyurethane resin pasted plate as a waterproof layer; JP2003160937 discloses a bridge deck waterproof composed of polyurethane waterproof material and asphalt concrete; JP2002122981 discloses a polyurethane waterproof material, thermoplastic adhesive The bridge deck composed of bonding material and poured asphalt concrete is waterproof. In these inventions, it is not enough to only use reactive resin as waterproofing. This layer has poor bonding performance with asphalt concrete, poor deformation performance, and the reactive resin material after construction is not sprinkled with small gravel, and the surface is relatively smooth. This will lead to poor shear resistance of the pavement layer, and it is prone to delamination and other diseases during use.

3. Contents of the invention

The idea of the present invention is to combine the reactive resin lower sealing layer, solvent-type asphalt rubber and rubber asphalt mastic together to form a waterproof system for bridge deck pavement. The lower sealing layer of the reactive resin has a strong waterproof sealing effect, and at the same time can provide a rough interface for the pavement layer to ensure the bonding between the pavement layers and prevent the layer from moving. Solvent-based asphalt rubber has high adhesive performance, and can better bond the reactive resin lower sealing layer and rubber asphalt mastic, and will not pollute the environment at the same time, and is convenient for construction. Rubber asphalt mastic has high water sealing and deformation properties, can absorb part of the deformation of the bridge deck, reduce the damage caused by the local stress concentration of the bridge deck, and has good bonding and shearing properties.

The purpose of the present invention is to provide a bridge deck pavement waterproof system with excellent performance, including the composition and preparation method of the system.

The present invention is achieved in this way: the system is composed of reactive resin lower sealing layer, solvent type asphalt rubber and rubber asphalt mastic, and the composition mass components of reactive resin lower sealing layer are:

Component A: bisphenol A epoxy resin 80-98 parts

Toughener 0～20 parts

B component: modified amine epoxy curing agent

The mass ratio of A and B components is 1:1～5:1

The ratio of small gravel to component A by mass is 40:1~1:1

The composition mass components of solvent-based asphalt rubber are:

AH-70 ^#Asphalt 20～60 parts

Benzene-free solvent 30～75 parts

Styrene butadiene block copolymer 5～25 parts

Petroleum resin 0～25 parts

Neoprene 0～15 parts

The composition quality components of rubber asphalt mastic are:

AH-70 ^#Asphalt 5～28 parts

Rosin 0～10 parts

Styrene butadiene block copolymer 0～10 parts

Asphalt modifier 0～12 parts

Natural rock asphalt 0～15 parts

50-88 parts of stone powder.

The modified amine epoxy curing agent of the present invention can be operated for a long time at normal temperature, and can continue to cure at normal temperature after construction.

The toughening agent in the present invention is a linear polymer containing hydroxyl and carboxyl groups.

The small crushed stones in the present invention are hard crushed stones of 0.3-2.36 m. Small gravel is required to be clean and clean.

The solvent of the present invention is a benzene-free solvent, has strong solubility, and belongs to alkanes.

The styrene-butadiene block copolymer of the present invention is a thermoplastic elastomer SBS prepared by anionic polymerization using alkyllithium as a catalyst.

The petroleum resin of the present invention is C5 petroleum resin or C9 petroleum resin.

The rosin of the present invention is a kind of natural organic matter, mainly composed of various resin acids, easily soluble in various organic solvents, and has unique chemical activity.

The asphalt modifier UB of the present invention is a new type of polyolefin asphalt modifier. Its melting point is about 115°C.

The natural rock asphalt of the present invention is a natural solid hydrocarbon resin type hard powder natural rock asphalt.

The stone powder in the present invention is limestone powder used in common asphalt concrete. But stone powder needs to be dried.

The pavement construction method of the material of bridge deck pavement waterproof system of the present invention, it is made up of following several steps:

Step 1: Preparation of solvent-based asphalt rubber, put styrene-butadiene block copolymer, petroleum resin, and neoprene into a closed container with stirring equipment according to the mass ratio, and then pour the specified quality of benzene-free solvent , melt it for 30 to 90 minutes, and fully stir it, then add AH-70 ^# asphalt in batches, stir to make it evenly mixed, and obtain solvent-based asphalt rubber;

Step 2: Mix the components A and B in the lower sealing layer of the reactive resin according to the mass ratio at room temperature and stir evenly with an electric hand-held stirring device, then roll it on the dry and clean bridge deck with a roller, and immediately sprinkle small gravel;

Step 3: After the sealing layer under the reactive resin is basically cured, apply solvent-based asphalt rubber with a roller;

Step 4: 4 to 10 hours after the construction of solvent-based asphalt rubber, rubber asphalt mastic can be constructed;

Step 5: Preparation of rubber asphalt mastic, first heat up AH-70 ^# asphalt to 160-180°C, then use an asphalt pump to inject it into the asphalt modification equipment and heat it up to 170-190°C, then add rosin, styrene butadiene Diene block copolymer, put the asphalt modifier UB into it and melt for 15-50 minutes, grind it with the colloid mill in the asphalt modification equipment for 5-15 times, and put the natural rock asphalt into it for mixing Evenly, the rubber asphalt binder is obtained. Put the produced rubber asphalt binder into the special stirring and heating equipment, and measure it, and then add the specified quality of stone powder in batches, and stir and heat up to 180-240°C to get Rubber asphalt mastic;

Step 6: Transport the rubber asphalt mastic to the construction site where the reactive resin lower sealing layer and solvent-based asphalt rubber construction have been completed, pour the rubber asphalt mastic onto the work surface in stages, and immediately smooth it with a trowel , that is to complete the construction of rubber asphalt mortar, and also complete the pavement construction of the entire bridge deck waterproof system.

The bridge deck pavement waterproofing system of the present invention has excellent performances such as waterproofing, bonding, anti-shearing, and anti-deformation. Compared with the existing bridge deck waterproof layer (film waterproof, membrane waterproof, polyurethane waterproof, etc.), it has excellent waterproof performance, convenient construction, and can be better combined with the upper asphalt concrete pavement to form a whole. With higher bonding strength and shear strength, asphalt rubber mastic has good deformation properties, so it can absorb part of the deformation of the bridge deck.

4. Specific implementation

The present invention is specifically described below through specific examples.

Example

Reactive Resin Lower Sealing Layer

(1) Weigh raw materials according to the following ratio

Component A: bisphenol A epoxy resin 86 parts

Toughener 14 parts

B component: modified amine epoxy curing agent 25 parts

Small gravel 270 parts.

(2) Preparation process

Add bisphenol A epoxy resin, toughening agent and modified amine epoxy curing agent into the container, stir and mix for about 15 minutes, and apply the mixture on the bridge deck with a roller, and immediately spread small gravel. That is, the lower sealing layer of the reactive resin is obtained.

Solvent-based asphalt rubber

(1) Weigh raw materials according to the following ratio

AH-70 ^#bitumen 40 parts

Benzene-free solvent 42 parts

Styrene butadiene block copolymer 13 parts

C5 petroleum resin 3 parts

Neoprene 2 parts

(2) Preparation process

Melt styrene-butadiene block copolymer, C5 petroleum resin, and neoprene in a benzene-free solvent for 30-90 minutes, and fully stir, then add AH-70 ^# asphalt in batches, stir to mix Evenly, the solvent-based asphalt rubber is obtained. And the solvent-based bituminous rubber is rolled on the basically cured reactive resin lower sealing layer with a roller.

rubber asphalt mastic

(1) Weigh raw materials according to the following ratio

AH-70 ^#asphalt 20 parts

Rosin 0.8 parts

Styrene butadiene block copolymer 2.6 parts

Asphalt modifier UB 0.4 parts

Natural rock asphalt 0.2 parts

Stone powder 76 parts

(2) Preparation process

First, raise the temperature of AH-70 ^# asphalt to 160-180°C, then use an asphalt pump to inject it into the asphalt modification equipment and heat it up to 170-190°C, then add rosin, styrene-butadiene block copolymer, and asphalt to modify Put agent UB into it and melt and expand for 15-50 minutes, grind 5-15 times with the colloid mill in the asphalt modification equipment, put the natural rock asphalt into it and mix it evenly to get the rubber asphalt binder. The produced rubber asphalt binder is poured into the special stirring and heating equipment, and measured, and then the specified quality stone powder is added in batches, and the temperature is stirred to 180-240°C to obtain the rubber asphalt mastic.

(3) Construction technology

Transport the rubber asphalt mastic to the construction site where the reactive resin lower sealing layer and solvent-based asphalt rubber construction have been completed, pour the rubber asphalt mastic on the work surface in stages, and immediately smooth it with a troweling tool, and it is complete Construction of rubberized asphalt mastic.

result test

The properties of the bridge deck pavement waterproofing system prepared in the above examples are shown in Table 1.

Table 1 Performance of bridge deck pavement waterproof system

Remarks: The bonding strength is tested by pulling out; the shear strength is tested by compression shearing; the water seepage coefficient is tested by keeping the water seepage pressure constant at 500mbar and continuing for 15 minutes; in the low temperature bending test, the rubber asphalt The sand rubber specimen is cut into length (250±2)mm, width (30±2)mm, height (35±2)mm prismatic trabecular, span diameter is (200±0.5)mm, mid-span loading, loading rate Under the condition of 50mm/min, test the flexural-tensile strain and flexural stiffness modulus at -10°C.

Claims (9)

1. the material of a deck paving waterproof system is made up of reaction resin bottom impermeable layer, solvent-borne type asphalt rubber and rubber asphalt sand gel, it is characterized in that the composition mass component of reaction resin bottom impermeable layer is:

A component: 80～98 parts of bisphenol A epoxide resins

0～20 part of flexibilizer

B component: amine epoxy curing agent modified

A, B constituent mass ratio are 1: 1～5: 1

Small crushed stone and A constituent mass component ratio are 40: 1～1: 1

The composition mass component of solvent-borne type asphalt rubber is:

AH-70 ^#20～60 parts of pitches

30～75 parts of non-toluene solvents

5～25 parts of styrene butadiene block copolymers

0～25 part of Petropols

0～15 part of neoprene

The composition mass component of rubber asphalt sand gel is:

AH-70 ^#5～28 parts of pitches

0～10 part of rosin

0～10 part of styrene butadiene block copolymer

0～12 part of asphalt modifier

0～15 part of natural kir

50～88 parts of stone flours.

2. according to the material of the described a kind of deck paving waterproof system of claim 1, it is characterized in that: described flexibilizer is the linear polymer that contains hydroxyl, carboxyl.

3. according to the material of the described a kind of deck paving waterproof system of claim 1, it is characterized in that: described small crushed stone is 0.3～2.36mm hard rubble.

4. according to the material of the described a kind of deck paving waterproof system of claim 1, it is characterized in that: described styrene butadiene block copolymer is to be that catalyzer carries out a kind of thermoplastic elastomer SBS that anionic polymerisation makes with the lithium alkylide.

5. according to the material of the described a kind of deck paving waterproof system of claim 1, it is characterized in that: described Petropols are carbon 5 or carbon 9 Petropols.

6. according to the material of the described a kind of deck paving waterproof system of claim 1, it is characterized in that: rosin is to refine through distillation with natural pine resin to form.

7. according to the material of the described a kind of deck paving waterproof system of claim 1, it is characterized in that: described asphalt modifier is a kind of polyolefin asphalt modifier UB.

8. according to the material of the described a kind of deck paving waterproof system of claim 1, it is characterized in that: the limestone stone flour that described stone flour adopts for the plain asphalt concrete.

9. the pavement construction method of the material of a deck paving waterproof system as claimed in claim 1 is characterized in that it is made up of following step:

Step 1: the preparation of solvent-borne type asphalt rubber, by mass ratio styrene butadiene block copolymer, Petropols, neoprene are put into the closed container that has mixing plant, pour the non-toluene solvent of definite quality then into, it is melted rise 30～90 minutes, and fully stir, again with AH-70 ^#Pitch adds in batches, stirs it is mixed, and promptly gets the solvent-borne type asphalt rubber;

Step 2: after the A in the reaction resin bottom impermeable layer, B component mixed at normal temperatures by mass ratio and stirring with the electric hand mixing plant, with cylinder with its roller coating on the bridge deck of dry cleansing, and spreading small crushed stone immediately;

Step 3: after question response resin bottom impermeable layer solidifies substantially, with cylinder roller coating solvent-borne type asphalt rubber;

Step 4: after the construction of solvent-borne type asphalt rubber finished 4～10 hours, the rubber asphalt sand gel of can constructing;

Step 5: the preparation of rubber asphalt sand gel, before this with AH-70 ^#Pitch is warming up to 160～180 ℃, then be injected into asphalt modification equipment and be warmed up to 170～190 ℃ with bitumenpump, again with rosin, styrene butadiene block copolymer, asphalt modifier UB put into wherein melt rose 15～50 minutes after, grind 5～15 times with the colloid mill in the asphalt modification equipment, and natural kir put into carry out mixing and stirring, promptly get the rubber asphalt binder, squeeze in the special-purpose stirring intensification equipment producing good rubber asphalt binder, and measure, then add the stone flour of definite quality in batches, and stir and to be warmed up to 180～240 ℃, promptly obtain rubber asphalt sand gel;

Step 6: rubber asphalt sand gel is transported to the job site of finishing reaction resin bottom impermeable layer and the construction of solvent-borne type asphalt rubber, the rubber asphalt sand gel gradation is poured on the scope of operation, and carry out floating with floating instrument immediately, promptly finish the construction of rubber asphalt sand gel, also finish the pavement construction of whole bridge deck water-proof system simultaneously.