Multicomponent system for improving modulus of asphalt mixture, and application method and modified asphalt thereof

A technology of asphalt mixture and application method, which is applied in building insulation materials, building components, buildings, etc., and can solve problems such as unsatisfactory low-temperature flexibility and crack resistance of asphalt concrete, unguaranteed low-temperature flexibility, and restricted production conditions. , to achieve the effect of improving high temperature stability, ensuring high strength and enhancing compatibility

Inactive Publication Date: 2014-05-14
SHANGHAI PUDONG ROAD & BRIDGE CONSTR +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these two types of technologies have obvious defects. The use of low-grade hard asphalt can increase the modulus of the mixture and make the mixture have excellent high-temperature performance, but the low-temperature flexibility cannot be guaranteed.
However, the application of hard asphalt in road engineering has just started, and the understanding of many issues is still unclear, and is restricted by production conditions; the compatibility of external admixture PP or PE with asphalt is poor, and the asphalt concrete modified by it The low temperature flexibility and crack resistance are not ideal, and it is easy to be brittle at low temperature

Method used

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  • Multicomponent system for improving modulus of asphalt mixture, and application method and modified asphalt thereof
  • Multicomponent system for improving modulus of asphalt mixture, and application method and modified asphalt thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This example provides a multi-component system for improving the modulus of asphalt mixture, which consists of 1 part of organic activated calcium sulfate whisker, 6 parts of waste tire rubber powder and 1 part of inferior animal and vegetable oil, wherein the organic activated calcium sulfate whisker is Calcium sulfate whiskers with borate-modified surfaces.

[0030] The method of applying this multi-component system to modified asphalt is as follows:

[0031] Put 0.5 parts of low-quality animal and vegetable oil in a cylindrical sealed tank, cover the surface with 6 parts of waste tire rubber powder, seal the sealed tank and place it in an oven at a temperature of 110°C for 2 hours; pour calcium sulfate whiskers Add 0.5 parts of low-quality animal and vegetable oil, and stir evenly; after the sealed tank is placed in the oven for 2 hours, take out and pour the mixture of low-quality animal and vegetable oil and waste tire rubber powder into hot asphalt at 130°C, keep ...

Embodiment 2

[0033] This example provides a multi-component system for improving the modulus of asphalt mixture, which consists of 2 parts of organic activated calcium sulfate whiskers, 7 parts of waste tire rubber powder and 2 parts of inferior animal and vegetable oils, wherein the organic activated calcium sulfate whiskers are Calcium sulfate whiskers surface-modified with stearic acid.

[0034] The method of applying this multi-component system to modified asphalt is as follows:

[0035] Put 1 part of low-quality animal and vegetable oil in a sealed tank, cover the surface with 7 parts of waste tire rubber powder, seal the sealed tank and place it in an oven at a temperature of 130°C for 3 hours; pour calcium sulfate whiskers into 1 After the sealed tank is placed in the oven for 3 hours, take out and pour the mixture of low-quality animal and vegetable oil and waste tire rubber powder into the base asphalt at 120°C, keep warm and continue stirring for 90 minutes; remove the heat prese...

Embodiment 3

[0037] The modification effect of Example 1 of the present invention on 70# matrix asphalt was compared with that of ordinary rubber powder modified asphalt process. The results show that the present invention not only greatly improves the high-temperature stability of 70# matrix asphalt, but also significantly improves the low-temperature extension than ordinary rubber powder under the premise of fully meeting the national standard "Waste Tire Rubber Powder Rubber Modified Asphalt in Highway Engineering" JT / T798-2011 Modified asphalt process. At the same time, the test results also show that the multi-component system has good compatibility with asphalt. The specific experimental parameters are shown in Table 1.

[0038] Table 1 The present invention and ordinary rubber powder modified asphalt process test results

[0039]

[0040]

[0041] Note: The normative standards quoted in Table 1 are the requirements of climate zone-temperature zone

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Abstract

The invention relates to a multicomponent system for improving the modulus of asphalt mixture, and an application method and modified asphalt thereof, wherein the multicomponent system comprises the following active ingredients in parts by weight: 1-2 parts of calcium sulfate, 1-2 parts of animal and plant oil, and 5-7 parts of waste tire rubber powder. The application method comprises the following steps: taking a part of animal and plant oil in a closed tank, covering the waste tire rubber powder on the surface of animal and plant oil, sealing a test tank, and closely heating at 100-140DEG C; infiltrating the calcium sulfate whiskers with the remaining animal and plant oil, and stirring to be evenly mixed; transferring the mixture in the test tank into hot asphalt which is at 130-140DEG C, continuously stirring for 40-90min, removing a heat source, continuously stirring until the temperature is reduced to 110-120DEG C, adding the mixture of calcium sulfate whiskers and animal and plant oil, and continuously stirring until the temperature is reduced to 95-100DEG C. The modified asphalt has multiple characteristics of being high in strength, strong in track resistance capability, good in low-temperature flexibility and asphalt compatibility, economic and environmentally friendly and the like.

Description

technical field [0001] The invention belongs to the intersecting field of roads, materials and environmental protection, and specifically relates to a multi-component system for improving the modulus of asphalt mixture and an application method of the multi-component system. In addition, the invention also relates to the modified bitumen modified by the multi-component system and the application method. Background technique [0002] At present, the combination of semi-rigid base and asphalt pavement structure is generally used on high-grade highways in our country. However, the intensification and upgrading of contradictions such as overloading, heavy load, heavy axle and double traffic volume have brought serious problems to the performance and life of the road. The pressure is getting heavier and heavier. Year after year of temperature rise, the number of passing vehicles and the increase of load (especially overload) and other factors are most likely to cause rutting, wh...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08K13/06C08K9/04C08K7/08C08K3/30C08K5/00C08L101/00
Inventor 罗芳艳王红玉闫国杰邓国民李军代陆风云马利志赫振华袁月李交夏庆宇徐韵淳邱轶王腾飞陈文娟吴月琴
Owner SHANGHAI PUDONG ROAD & BRIDGE CONSTR
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