A diatomite asphalt mixture modifier and modified asphalt mixture

Abstract

The invention discloses a diatomite asphalt mixture modification agent and a modified asphalt mixture. The diatomite asphalt mixture modification agent is prepared from activated diatomite and polyethylene wax, wherein the mass percent of the polyethylene wax is 2%-22%; the activated diatomite is diatomite obtained by carrying out an activation step on diatomite raw ores; the activation step comprises the following steps of crushing the diatomite raw ores, scrubbing, grading and carrying out ultrasonic vibration; the fineness of the activated diatomite is 325-800 meshes. Compared with an asphalt mixture modified by SBS (Styrene Butadiene Styrene), the dynamic stability DS of the asphalt mixture modified by the modification agent is increased by at least 30%, the water stability (residue stability) is increased by at least 3% and the low-temperature anti-cracking performance (low-temperature failure strain) is improved by at least 1%.

Description

technical field [0001] The invention relates to the technical field of modifiers for asphalt mixtures. Background technique [0002] Ordinary road asphalt has poor temperature sensitivity, poor elasticity, and poor aging resistance without modification. It is prone to flow at high temperatures and brittle cracks at low temperatures. The increase in the number of vehicles and the increase in the heavy load of vehicles have increased the requirements for pavement materials. [0003] The performance of asphalt pavement depends largely on the nature and quality of the asphalt mixture used. A lot of research has been done at home and abroad on the modification of asphalt and asphalt mixture. The currently studied modifiers include thermoplastic rubber. , such as SBS, SIS, SE / BS, etc.; Rubber, such as NR, SBR, CR, BR, etc.; The quality is difficult to control, the energy consumption is high, and the environmental protection is poor. Contents of the invention [0004] The obje...

AI Technical Summary

Problems solved by technology

[0002] Ordinary road asphalt has poor temperature sensitivity, poor elasticity, and poor aging resistance without modification. It is prone to flow at high temperatures and brittle cracks at low temperatures. increase, the heavy load of vehicles increases, and the requirements for pavement materials continue to increase

[0003] The performance of asphalt pavement depends largely on the nature and quality of the asphalt mixture used. A lot of research has been done at home and abroad on the modification of asphalt and asphalt mixture. The currently studied modifiers include thermoplastic rubber. , such as SBS, SIS, SE / BS, etc.; Rubber, such as NR, SBR, CR, BR, etc.; Difficult to control quality, high energy consumption, poor environmental protection