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A toughened warm mix epoxy asphalt for steel bridge deck pavement

A technology of steel bridge deck and asphalt, applied in the field of transportation, can solve the problems of failure and damage, high brittleness of concrete, different chemical properties, etc., and achieve the effect of improving road performance and high temperature stability.

Active Publication Date: 2018-09-28
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since epoxy asphalt is a complex multi-component blending system with different chemical properties among its components, how to ensure the structural stability of the blending system and the excellent performance of the cured product is a key issue in the research and development of epoxy asphalt. In addition, during the use of epoxy asphalt concrete steel bridge deck pavement, due to the high brittleness of epoxy asphalt concrete, the cracking of the pavement layer, fatigue cracks and interlayer bond failure caused by insufficient flexibility are also not uncommon

Method used

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  • A toughened warm mix epoxy asphalt for steel bridge deck pavement
  • A toughened warm mix epoxy asphalt for steel bridge deck pavement
  • A toughened warm mix epoxy asphalt for steel bridge deck pavement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1 Steel bridge deck pavement binder preparation

[0015] Accurately weigh the following materials by weight:

[0016]

[0017] B component: Bisphenol A type epoxy resin E51 100 parts

[0018] Propylene oxide butyl ether 2 parts

[0019] In component A, first mix asphalt and maleic anhydride at 120°C and mix evenly, when the maleic anhydride is completely incorporated into the asphalt, then add MBS elastomer to the asphalt at 120°C, keep stirring, and the stirring rate is controlled at 200 -250rpm, after the MBS elastomer is completely dissolved in the asphalt, add methyl hexahydrophthalic anhydride and phenol in turn, stir and mix, the stirring speed is controlled at 200-250rpm, and the stirring time is 20min.

[0020] In component B, add bisphenol A epoxy resin E51 to propylene oxide butyl ether at 50°C and stir evenly.

[0021] Mix components A and B according to the mass ratio A:B=1:6.08, and stir at 120°C for 2-3 minutes to prepare a binder.

Embodiment 2

[0023] By preparing the binder mixed with MBS modification and the binder without MBS modification, and carried out the test of tensile strength and elongation at break, the standard specified in GB / T 16777-2008 "Test Methods for Building Waterproof Coatings" was adopted. Test piece production method Form the test piece. After the test piece is prepared, it is placed in an oven at 120 ° C for 4 hours. At this time, the test piece is completely cured. After the temperature of the specimen is stable, the tensile test is carried out. The whole test is carried out on a universal material testing machine, and the test tensile rate is 50±5mm / min. Six specimens were selected as a group for tensile test, and the average value of the results was taken as the test result.

[0024] The test results are as follows:

[0025] Table 1 Tensile strength and elongation at break of the binder under different test conditions

[0026]

Embodiment 3

[0030] The epoxy asphalt mixture was subjected to rutting test, low temperature bending test, freeze-thaw splitting test and fatigue test. The test process is as follows:

[0031] Rutting test: The rutting test in my country uses a 300mm×300mm×50mm rutting test mold, and the specimen is formed by a wheel mill according to the standard method stipulated in the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011). The test wheel is a solid tire made of rubber, with a diameter of 200mm, a width of 50mm, a rubber layer thickness of 15mm, a wheel pressure of 0.7MPa, a test temperature of 70°C, and a running speed of the loading wheel at 42 times / min. The rutting test is usually carried out for 60 minutes or until the maximum deformation reaches 25mm, and the dynamic stability DS (times / mm) is calculated according to the formula:

[0032]

[0033] In the formula: d 1 is the load wheel action time t 1 (Generally 45min) permanent deformation, ...

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Abstract

The invention belongs to the technical field of traffic, and discloses a novel material which is mainly used for steel bridge deck pavement to improve the pavement performance of steel bridge deck pavement. The asphalt material is softened and toughened by adopting a MBS core-shell grafted copolymer as a toughening agent and adopting a phenolic compound as a compatibilizing agent through the characteristics that the flexibility of the MBS core-shell grafted copolymer is good at low temperature and the MBS core-shell grafted copolymer can be soluble with asphalt, the interfacial tension between the asphalt and epoxy resin is decreased by serving the phenolic compound as a third phase through the characteristic that the phenolic compound can be soluble with the asphalt and the epoxy resin, and then the purpose that the blend system is stable is achieved.

Description

technical field [0001] The invention belongs to the technical field of traffic, and is mainly used for steel bridge deck pavement, and is a novel material for improving the road performance of the steel bridge deck pavement. Background technique [0002] With the gradual expansion of my country's modern highway infrastructure construction, more and more steel structure bridges have been built and put into operation. Orthotropic steel bridge decks are generally used in steel structure bridges. Due to the complex stress and deformation of steel bridge decks, the pavement problem has always been a hot and difficult point in the world. As a kind of thermosetting material, epoxy asphalt material has excellent high temperature stability and fatigue cracking resistance compared with thermoplastic ordinary asphalt material, so it is an ideal steel bridge deck pavement material. However, since epoxy asphalt is a complex multi-component blending system with different chemical propert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C08L51/04C08L63/00C08K5/00C08K5/1539C08K5/13C08K5/1515
CPCC08K2201/014C08L95/00C08L2201/08C08L2205/03C08L2207/53C08L2555/24C08L2555/80C08L51/04C08L63/00C08K5/00C08K5/1539C08K5/13C08K5/1515Y02A30/30
Inventor 张平李宇峙黄云涌赵锋军
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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