High-viscosity anti-rut modified asphalt for ultrathin overlay and preparation method thereof

Abstract

The invention discloses a high-viscosity anti-rut modified asphalt for an ultrathin overlay and a preparation method thereof, and belongs to the technical field of road maintenance. The modified asphalt is prepared from 100 to 110 parts of matrix asphalt, 25 to 30 parts of waste tire rubber powder pretreated by a silane coupling agent, 5 to 8 parts of SBS and 1 to 3 parts of DOMIX. The softening point (DEG C) of the prepared high-viscosity anti-rut modified asphalt is 85.7, the needle penetration (25 DEG C, 0.1 mm) is 23.5, the ductility (5 DEG C, 5cm/min) is 29.6, the elastic recovery (%) is89.0, and the dynamic viscosity (60 DEG C, Pa.s) is 203528. The asphalt has excellent high-temperature stability, low-temperature crack resistance, viscosity, self-healing property and economical efficiency; and the preparation method is simple, green and efficient, can be used for large-scale batch production in construction sites and factories, can adapt to various engineering application requirements, and has important significance for promoting application and popularization of preventive maintenance technologies such as ultrathin overlay and the like in new construction and maintenance ofasphalt pavements in China.

Description

technical field [0001] The invention relates to the technical field of road maintenance, in particular to a high-viscosity anti-rutting modified asphalt for ultra-thin overlays and a preparation method thereof. Background technique [0002] At present, ultra-thin overlay maintenance technology has become a commonly used preventive maintenance and intermediate maintenance method in the world. It has the advantages of prolonging the service life of the road surface, improving service quality, short closed traffic time, fast maintenance, light weight and thickness It is thin, has little change to the original road elevation, can be used for bridge pavement paving, and has good economical advantages. Although the ultra-thin overlay has the above advantages, the ultra-thin overlay maintenance technology still has the following deficiencies: (1) The adhesion between the ultra-thin overlay and the road surface is poor, and under the action of driving load, it is easy to cause ultra...

AI Technical Summary

Problems solved by technology

Although the ultra-thin overlay has the above advantages, the ultra-thin overlay maintenance technology still has the following deficiencies: (1) The adhesion between the ultra-thin overlay and the road surface is poor, and under the action of driving load, it is easy to cause ultra-thin overlay. The overlay is separated from the road surface; (2) The durability of the ultra-thin overlay is insufficient. With the erosion of the sun, the moon, and the erosion of rainwater, the performance of the overlay such as skid resistance, high-temperature stability, and low-temperature crack resistance declines rapidly; (3) The performance of asphalt binder is poor, and the ultra-thin overlay mixture is prone to looseness, rutting, and wrapping, etc.

Although its high-temperature performance has been improved to a certain extent, it is not outstanding, and its low-temperature performance is poor, and its viscosity is low, which cannot completely solve the drawbacks of the ultra-thin overlay; Coal ash or coal gangue, calcium carbonate, vaseline to prepare high-efficiency rubber asphalt modifier and preparation method. Although the modified asphalt prepared by this method has certain high temperature stability, its low temperature stability, water stability and viscosity are not outstanding , not enough to fundamentally solve the problem of ultra-thin cover

In summary, the high-viscosity anti-rutting modified asphalt prepared by the current method cannot meet the performance requirements of the ultra-thin overlay maintenance technology, which greatly reduces the high-temperature stability, low-temperature crack resistance, water stability and viscosity of the asphalt. Service quality, service life and application range of ultra-thin overlay maintenance technology

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