Pavement super-tough wearing layer and hot paving process thereof

Abstract

The invention discloses a pavement super-tough wearing layer and a hot paving process thereof. The pavement super-tough wearing layer comprises a bonding lower layer and a wearing upper layer. The bonding lower layer comprises the following components, by weight: 40 to 50 parts of asphalt, 30 to 60 parts of xylene, 2 to 15 parts of acrylic resin, 2 to 15 parts of polyurethane, and 2 to 8 parts ofSBS thermoplastic styrene-butadiene rubber; the wearing upper layer comprises the following components, by weight: 80 to 110 parts of aggregate, 5 to 9 parts of high-toughness and high-elasticity composite modified asphalt, and 3 to 6 parts of mineral powder. Besides, the hot paving process of the pavement super-tough wearing layer comprises a paving step of a bonding lower layer and a paving stepof a wearing upper layer. After improvement of the components of the bonding lower layer and the wearing upper layer, the pavement has super-strong reflection crack resistance, low-temperature cracking resistance and fatigue cracking resistance.

Description

technical field [0001] The invention relates to a pavement super-tough wearing layer and a hot paving process thereof, belonging to the technical field of pavement construction. Background technique [0002] Asphalt pavement has the advantages of driving safety, comfort, and convenient maintenance. At present, more than 85% of new high-grade highways in my country use asphalt pavement. Under the long-term effect of natural environment and vehicle load, asphalt pavement will gradually show phenomena such as cracking, rutting, insufficient skid resistance, looseness, aging and pitting. If it is not repaired in time, the disease will further accelerate and deteriorate. On the one hand, it will affect the pavement The overall service life of the asphalt pavement accelerates the arrival of major and medium repairs on the pavement; on the other hand, it will affect the safety, comfort and aesthetics of driving. . In addition, many cement pavements were built in my country in the...

AI Technical Summary

Problems solved by technology

In addition, many cement pavements were built in my country in the early stage. Due to the defects of difficult maintenance, poor comfort, safety and aesthetics of cement pavements, many cement pavements have been or need to be transformed from "white to black". It can be applied to asphalt pavement maintenance and cement pavement "white to black" ultra-thin overlay. This ultra-thin overlay should be able to form a super-strong bond with the old pavement. The wear layer should have super crack resistance and good wear resistance. Anti-slip, anti-water damage, high-temperature stability, and should also have the characteristics of driving comfort, safety, durability, and low noise

[0003] At present, the asphalt pavement maintenance overlay and the "white to black" technology that have been widely used in China have micro-surfacing. The bonding strength between the traditional micro-surfacing and the old pavement is insufficient, and it is easy to fall off, fast attenuation, poor durability, and surface bone. However, although the ultra-thin wear layer technology in the prior art can overcome some of the defects of the micro-surfacing technology, it can be changed from white to black on asphalt pavement or cement pavement with severe cracks. "Reflective cracks are easy to occur when covering the surface. The cracking will weaken the waterproof function of the covering layer, affecting the durability and aesthetics. Because the ultra-thin wearing layer adopts open gradation, the void ratio is large, and the cement pavement or bridge surface is "white to black". When overlaying, the adhesion between the overlay and the old cement pavement is poor, and it is easy to fall off

In addition, the ultra-thin wear layer needs a special synchronous asphalt paver for synchronous spraying of emulsified asphalt sticky layer oil. The cost of paving equipment is high, the investment is large, and the economic and social benefits are not ideal.

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