Wide temperature range modified asphalt for roads and preparation method thereof

Abstract

The invention relates to wide temperature range modified asphalt for roads. The asphalt is composed of, by weight, 80-90 parts of matrix asphalt, 1-6 parts of SBS (styrene-butadiene-styrene) modifier, 10-30 parts of activated waste tire rubber powder, 2-6 parts of light oil, 0.1-0.5 part of terpene resin and 0.1-0.5 part of elemental sulfur. The wide temperature range modified asphalt for the roads has good performances of being free of flowing at high temperature and being free of cracking at low temperature, usage temperature range can reach higher than 100 DEG C, the preparation method is simple, and production can be directly performed on original SBS modifier production devices, so that cost investment of production equipment is reduced.

Description

technical field [0001] The invention relates to a modified asphalt and a preparation method thereof, in particular to a wide temperature range modified asphalt for roads and a preparation method thereof. Background technique [0002] Asphalt is a kind of viscoelastic material, which is widely used in the paving of road surface. It has many advantages such as comfortable driving, easy repair and long service life. However, the temperature range of ordinary road petroleum asphalt is narrow, and flow deformation occurs at high temperature, which leads to road rutting, and cracks are easy to occur at low temperature, so modified asphalt appears as a new pavement material, which solves the above problems well. However, under normal circumstances, the operating temperature range of modified asphalt is only about 80°C. For example, the commonly used PG64-22 has a temperature operating range of 86°C. For areas with large temperature differences, such as the Gobi area in Hexi, Gansu...

AI Technical Summary

Problems solved by technology

For areas with large temperature differences, such as the Gobi area in Hexi, Gansu, the daytime temperature is as high as 40°C in summer, and it will drop below 0°C at night, while the road surface temperature will be as high as 70°C during the day, and the low temperature in winter can reach -30°C. Defects such as rutting and cracks will quickly occur on permanent asphalt, resulting in a decrease in road quality and a shortened service life. If the amount of modifier is increased blindly, it will lead to a decrease in asphalt construction performance and unstable quality.

[0003] The patent application number 201010522786.5 mentions that styrene-butadiene rubber and polyethylene wax are used as raw materials to prepare wide temperature range modified asphalt. Although it is introduced that its 5°C ductility is greater than 150cm, the addition of polyethylene wax makes the modified asphalt brittle. rise, but degrades the low-temperature performance

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