Modified emulsified asphalt as well as preparation method and application thereof

Abstract

The invention provides modified emulsified asphalt and a preparation method and application thereof.The modified emulsified asphalt comprises emulsified asphalt, a modifier and a stabilizer, the modifier is composed of natural latex, petroleum resin emulsion and third modified liquid, and the third modified liquid is at least one of neoprene latex, butyronitrile latex and terpene resin emulsion. The natural latex, the petroleum resin emulsion and the third modified liquid are compounded, so that the bonding strength and the low-temperature performance of the emulsified asphalt can be well considered, and other complicated modification steps are not needed. Meanwhile, the modified emulsified asphalt can accelerate the demulsification speed, has the characteristic of no adhesion to wheels, allows paving equipment to construct on an adhesive layer material, does not influence the adhesive layer quality and cause performance loss due to adhesion of asphalt to a tire in the construction process, has good adhesive strength of a formed adhesive layer surface, improves the construction efficiency, and has good application prospects. And the diseases such as pavement delamination and fatigue cracking caused by bonding failure are reduced.

Description

technical field [0001] The invention relates to the technical field of road materials, in particular to a modified emulsified asphalt and its preparation method and application. Background technique [0002] Thin layer overlay is an ultra-thin asphalt concrete wear layer technology, mainly used for preventive maintenance of high-grade asphalt or cement pavement and corrective maintenance of minor diseases. Generally speaking, the service life of general expressway pavement is at least 6 years, but an excellent thin-layer overlay can effectively prolong the service life of expressways, and usually can make the service life reach more than 8-10 years. At the same time, the rough surface of the wear layer can increase the skid resistance of the wheel, effectively reduce noise, and has better water permeability, which can greatly reduce the common water mist in rainy days and improve visibility. [0003] Because the thin-layer overlay often does not have a large thickness (gene...

AI Technical Summary

Problems solved by technology

During the construction of a specific project, ordinary emulsified asphalt or SBS modified emulsified asphalt is often used for the general sticky layer, which is easily damaged by the rolling of construction vehicles during the construction process, and it is easy to cause the interlayer bonding to fail to meet the standard

The poor interlayer bonding state will seriously affect the performance of various pavement structures. During construction, the interlayer treatment effect will not be good, and insufficient shear strength and bond strength will be provided, resulting in interlayer shear damage. Then various diseases appear in the late stage of asphalt pavement

However, if the bond strength is increased blindly, it will easily lead to the decline of low temperature performance, that is, the ductility is poor in low temperature environment, and it is not easy to construct.

At the same time, the existing emulsified asphalt takes a long time to demulsify. After spreading, the construction unit usually needs to wait for several hours before allowing the paving vehicles to enter the site for the paving of the mixture, resulting in a decrease in construction efficiency.

That is to say, it is difficult for the existing technology to balance the three aspects of bonding performance, low temperature performance and construction efficiency

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