Asphalt modified with desulfurized rubber powder

A technology of desulfurized rubber powder and modified asphalt, which is applied to building components, building insulation materials, buildings, etc., can solve the problems of poor storage stability of modified asphalt, large void ratio, and insufficient compaction of asphalt concrete pavement

Inactive Publication Date: 2003-09-10
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because this rubber powder is in a vulcanized state, it can only swell a small amount in asphalt, and the rubber powder exists in asphalt similar to elastic fillers, and has limited modification effect on the high and low temperature properties of asphalt. , the storage stability of modified asphalt is very poor, and rubber powder and asphalt are easily separated
In addition, since the rubber powder has not been dissolved and swelled, it has a certain degree of resilience, which can easily cause insufficient compaction of the asphalt concrete pavement, large void ratio, and the pavement is easy to be damaged

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Asphalt (softening point 46°C, penetration degree 88dmm) 89.5%, 10% desulfurized rubber powder prepared by high-speed rotation heating method, and 0.5% epoxidized polybutadiene. The manufacturing method is as follows: first heat the asphalt to 180~190℃, then add desulfurized rubber powder and epoxidized polybutadiene, control the temperature unchanged, stir at high speed for 3 hours, and cool down to obtain the desulfurized rubber powder modified asphalt . Compared with the undesulfurized rubber powder modified asphalt, the softening point of the modified asphalt increased from 57℃ to 59℃, the ductility at 5℃ increased from 8.3cm to 10.5cm, and the softening point difference of the upper and lower layers after storage at 163℃ for 48h was from 9.2℃ is reduced to 6.5℃, so it has better high and low temperature performance and storage stability.

Embodiment 2

[0017] Asphalt (softening point 44°C, penetration degree 121dmm) 84.7%, 15% desulfurized rubber powder prepared by dynamic desulfurization method, and 0.3% glycidyl methacrylate. The manufacturing was carried out according to the manufacturing procedure similar to that of Example 1. Compared with the modified asphalt with undesulfurized rubber powder, the obtained modified asphalt has a softening point increased from 60°C to 63°C, and a ductility at 5°C increased from 12.6cm to 15.5cm. After storage at 163°C for 48 hours, the softening point difference of the upper and lower layers has increased from 11.4℃ is reduced to 7.2℃, showing better modification effect.

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PUM

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Abstract

The present invention relates to asphalt modified with desulfurized rubber powder for road construction. The modified asphalt is produced with desulfurized rubber powder 5-30 wt%, asphalt 70-95 wt% and compatibilizer 0-1.5 wt% and through high speed shearing stirring for grinding in colloid mill. The modifier desulfurizing rubber powder has good dissolving and swelling performance in asphalt and has much active radicals in the surface for bonding with asphalt, and the compatilizer can further increase the interaction between the rubber powder and asphalt, so that the modified asphalt has excellent high and low temperature performance and storage stability.

Description

Technical field [0001] The invention relates to a desulfurized rubber powder modified asphalt suitable for road construction. Background technique [0002] Asphalt is an important building material and has been widely used in road construction and building waterproofing. However, ordinary asphalt can no longer meet the performance requirements of modern high-grade pavements due to its shortcomings such as easy brittleness at low temperature, easy softening at high temperature, and poor elasticity. With the development of transportation and the massive construction of high-grade highways, the demand for high-performance asphalt is increasing. For this reason, the asphalt must be modified. Asphalt modification usually involves adding polymers to the asphalt to improve the heat resistance of the asphalt, reduce its low-temperature brittleness, improve its elasticity, plasticity and low-temperature deformation, and increase its anti-destructive ability. The polymers currently used fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00
Inventor 余剑英
Owner WUHAN UNIV OF TECH
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