Rubber powder modified asphalt with high fatigue resistance and cracking resistance and preparation method of rubber powder modified asphalt

Abstract

The invention discloses a rubber powder modified asphalt with high fatigue resistance and cracking resistance and a preparation method of the rubber powder modified asphalt. Firstly, nano-crystallinecellulose is grafted with an epoxy group, and then nano-crystalline cellulose is subjected to a reaction with white carbon black, and modified white carbon black is obtained; the surface of waste rubber powder is grafted with polystyrene, the waste rubber powder is modified with polyphenyl ether and hydrogenated styrene-ethylene-styrene terpolymer particles, and modified rubber powder is obtained;glass fibers are modified with a silane coupling agent, the modified glass fibers, the modified rubber powder and limestone are mixed into matrix asphalt, the modified rubber powder, the modified glass fibers and groups in asphalt raw materials are reacted mutually, a dense and stable network structure is formed, pores of an asphalt mixture are filled with the limestone, and the rubber powder modified asphalt is prepared. The principle is simple, reaction conditions are mild, waste rubber tire resources are utilized reasonably, environmental pressure is relieved, and the prepared asphalt mixture has good overall performance, is cheap and is quite practical.

Description

technical field [0001] The invention relates to the technical field of asphalt, in particular to a rubber powder modified asphalt with high fatigue resistance and crack resistance and a preparation method thereof. Background technique [0002] Asphalt is a high-viscosity organic mixture composed of hydrocarbons of different molecular weights and their non-metallic derivatives. It is mainly divided into three types: coal tar pitch, petroleum pitch, and natural pitch. It has excellent ductility and is widely used in construction. , roads and other fields; however, after repeated loads on asphalt pavement, the compressive strength decreases and fatigue cracking is prone to occur; adding rubber powder as a modifier to asphalt mixture can effectively improve the fatigue resistance of asphalt materials, Enhance the freeze-thaw resistance and sound insulation effect of asphalt pavement, but at the same time, it will also cause the problem of decrease in asphalt strength; in order t...

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Problems solved by technology

[0002] Asphalt is a high-viscosity organic mixture composed of hydrocarbons of different molecular weights and their non-metallic derivatives. It is mainly divided into three types: coal tar pitch, petroleum pitch, and natural pitch. It has excellent ductility and is widely used in construction. , roads and other fields; however, after repeated loads on asphalt pavement, the compressive strength decreases and fatigue cracking is prone to occur; adding rubber powder as a modifier to asphalt mixture can effectively improve the fatigue resistance of asphalt materials, Enhance the freeze-thaw resistance and sound insulation effect of asphalt pavement, but at the same time, it will also cause the problem of decrease in asphalt strength; in order to make up for the problem of decrease in strength of asphalt mixture after adding rubber powder, people will add white carbon black to asphalt mixture

Silica is an ultrafine powder with white amorphous structure, the main component is amorphous silica, its surface has a large number of silanol hydroxyl groups, and the compatibility with rubber molecules is very poor. Silica particles Insufficient inter-repulsion force, prone to agglomeration, resulting in poor reinforcement effect

[0003] With the rapid development of the automobile industry, a large number of waste rubber tires are produced every year. The waste rubber tires are difficult to degrade naturally. The accumulation of a large number of waste rubber tires will not only occupy a large amount of space, but also pollute the environment. Improper storage can also easily cause spontaneous combustion and release a large amount of toxic gases. and particulate matter, endangering human health; rational use of waste rubber tires to alleviate "black pollution" and reduce environmental pressure is imminent; adding rubber powder made from waste rubber tires to asphalt mixture can significantly improve the high temperature stability and low temperature resistance of asphalt pavement cracking, anti-aging and durability, but the rubber powder made of waste rubber tires has poor storage stability, poor binding force with asphalt mixture, prone to segregation, and cannot effectively exert its performance, so the waste rubber powder is directly mixed into asphalt In the mixture, the prepared rubber powder has insufficient anti-fatigue ability, and is prone to breakage under impact and vehicle rolling. At present, related technologies mainly use organic solvents and aromatic oils to stir and dissolve at a temperature of 150-300°C, thereby increasing waste rubber. However, the use of a large amount of organic solvents will cause great harm to the environment, and the flame retardancy of ordinary waste rubber powder is insufficient. The asphalt and mixture made of ordinary waste rubber powder encounter sudden It is easy to cause burning in the event of a catastrophic fire, and it is difficult to control the fire in time, resulting in economic and property losses

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