Composite modified asphalt bridge deck waterproof bonding layer

A technology of composite modified asphalt and waterproof bonding layer, which is applied in the direction of asphalt material adhesives, bridges, adhesives, etc., can solve the problems of premature aging, insufficient crack resistance, and reduced flexibility of asphalt materials, and achieve excellent bonding. Performance and water resistance, effect of improved temperature and mechanical properties, high water resistance and resistance to deformation

Active Publication Date: 2019-05-24
HENAN PROVINCIAL COMM PLANNING & DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing asphalt waterproof adhesive layer materials mainly include epoxy asphalt, SBS modified asphalt, rubber asphalt, etc. There are two main problems in actual use. One is low adhesion and unsatisfactory interlayer bonding effect. The large horizontal push and shear force generated by vehicle braking can easily lead to defects such as wrapping and pits on the bridge deck pavement layer; the second is that the crack resistance is insufficient, and water seepage is prone to occur, resulting in corrosion of steel bars inside the structure , cause irreversible damage to the beam body, shorten the service life of the bridge, and directly endanger the safety of the bridge; the addition of epoxy resin greatly reduces the flexibility of the asphalt material, and often faces the cracking and deflection of the waterproof layer caused by the cracking stress of the base layer being transmitted to the waterproof layer Problems such as fatigue or premature aging under high stress conditions

Method used

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  • Composite modified asphalt bridge deck waterproof bonding layer
  • Composite modified asphalt bridge deck waterproof bonding layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 Preparation of Epoxy Modified Asphalt

[0034] 1. Prepare materials: 100 parts of base asphalt, 15 parts of epoxy resin, 8 parts of curing agent, 4 parts of vulcanizing agent, 1.5 parts of curing accelerator, 3 parts of styrene-butadiene rubber, 0.5 part of 500 mesh talcum powder;

[0035] Preparation steps:

[0036] In the first step, put the melted base asphalt into the mixer, heat it at 170-180°C, add styrene-butadiene rubber, and continue stirring through the colloid mill for 15-30 minutes, so that the styrene-butadiene rubber is evenly distributed in the base asphalt;

[0037] In the second step, the temperature is controlled at 130-150 ℃, adding epoxy resin, vulcanizing agent, curing accelerator and talcum powder, and continuing to stir for 15-20 minutes to mix evenly;

[0038] The third step is to keep the temperature at 120-140 ℃, add the curing agent into the mixer, and stir for 10-15 minutes to obtain epoxy-modified asphalt.

Embodiment 2

[0039] Example 2 Preparation of thermoplastic elastomer modified asphalt

[0040] 1. Preparation of materials: 100 parts of matrix asphalt, 25 parts of epoxidized natural rubber, 35 parts of thermoplastic elastomer, 1.0 part of polyphenylene ether with a fineness of 20-40 mesh, and 4 parts of glass fiber with a length ≤ 5mm;

[0041] 2. Steps:

[0042] The first step is to put the melted matrix asphalt into a high-speed shear mixing emulsifier, the temperature is controlled at 150-160°C, first add thermoplastic elastomer, and shear at a high speed of 4000rpm for 30 minutes to obtain an asphalt binder;

[0043] In the second step, heat the asphalt binder prepared in the first step to 170-180°C, then add polyphenylene ether and epoxy natural rubber, and shear at a high speed of 4000rpm for 40 minutes until the epoxy natural rubber is completely integrated into the asphalt adhesive Finally, add glass fiber and stir for 5 minutes to obtain thermoplastic elastomer modified asphalt...

Embodiment 3

[0044] Example 3 Laying a composite modified asphalt bridge deck waterproof bonding layer

[0045] Its specific construction method is:

[0046] The first step is to apply epoxy modified asphalt at a rate of 0.4kg / m within 2 hours after the completion of the construction on the concrete bridge deck. 2 Spray directly, and lay the epoxy modified asphalt lower bonding layer 1. During the temporary storage and spraying of the asphalt, it needs to be in a state of constant stirring at 120-140°C;

[0047] In the second step, press 0.6kg / m on the adhesive layer 1 under the epoxy modified asphalt 2 Lay the thermoplastic elastomer modified asphalt waterproof layer 2 with the same amount as the first step;

[0048] The third step is laying the engineering plastic modified asphalt upper bonding layer 3 on the thermoplastic elastomer modified asphalt waterproof layer 2, and the laying method is the same as the first step.

[0049] The waterproof adhesive layer of the composite modified...

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Abstract

The invention discloses a composite modified asphalt bridge deck waterproof bonding layer. The composite modified asphalt bridge deck waterproof bonding layer comprising a bonding lower layer, a bonding upper layer and a waterproof layer is characterized in that the bonding upper layer and lower layer are paved from epoxy modified asphalt of 0.4 kilogram per square metre; the waterproof layer is paved from thermoplastic elastomer modified asphalt of 0.6 kilogram per square meter; the epoxy modified asphalt is prepared, in proportion, from matrix asphalt, epoxy resin, curing agents, vulcanizingagents, curing accelerator, styrene butadiene rubber and talc; the thermoplastic elastomer modified asphalt is prepared, in proportion, from matrix asphalt, epoxidized natural rubber, thermoplastic elastomer, polyphenylene ether, and fiber. The composite modified asphalt bridge deck waterproof bonding layer has the advantages of making full use different characteristics of each material to enablethe waterproof bonding layer to have excellent bonding and waterproof properties, guaranteeing the epoxy modified asphalt to be in full bonding with a concrete bridge deck and an asphalt mixture surface layer, and avoiding various problems such as avoids problems such as waterproof layer breakage and flexural fatigue caused by base layer cracking stress transmitted to the waterproof layer, and premature aging under high stress by the thermoplastic elastomer modified asphalt.

Description

technical field [0001] The invention relates to road material engineering, in particular to a composite modified asphalt bridge deck waterproof bonding layer. Background technique [0002] The waterproof bonding layer is an important part of cement concrete bridge deck pavement. The waterproof bonding layer is located between the bridge deck and the asphalt pavement layer, and plays a role in reliably connecting the two structural layers to form an overall structure. One of the key layers in the paving system. [0003] The existing asphalt waterproof adhesive layer materials mainly include epoxy asphalt, SBS modified asphalt, rubber asphalt, etc. There are two main problems in actual use. One is low adhesion and unsatisfactory interlayer bonding effect. The large horizontal push and shear force generated by vehicle braking can easily lead to defects such as wrapping and pits on the bridge deck pavement layer; the second is that the crack resistance is insufficient, and wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D19/08C09J195/00C09J163/00C09J11/08C09J11/04
Inventor 王笑风周本涛刘东旭杨博宋国瑞王振军李豪刘建飞万晨光杨鹏辉孟斌赛高峰
Owner HENAN PROVINCIAL COMM PLANNING & DESIGN INST CO LTD
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