Asphalt modifier, modified emulsified asphalt, modified asphalt mixture and respective preparation methods thereof

Abstract

The invention provides an asphalt modifier which consists of a composition I and styrene-butadiene-styrene block copolymer emulsion, wherein the composition I consists of ethylvinylacetate emulsion, styrene-butadiene emulsion, waterborne bisphenol A epoxy resin emulsion and organic silicon modified acrylate emulsion. The invention also provides modified emulsified asphalt and a rapid-curing modified asphalt mixture which comprise the asphalt modifier, and respective preparation methods. The modified asphalt mixture provided by the invention is a brand new rapid-curing high-performance pavement material. The modified asphalt mixture not only has rigidity and intensity of mineral aggregates, but also has flexibility of asphalt and has Marshall stability of over 12KN and a flow value of between 2 to 4mm; and after an asphalt pavement repair layer with a thickness of 1 to 3cm is constructed for about 4 hours, the traffic can be opened.

Description

technical field [0001] The invention belongs to the technical field of macromolecules and road materials, and in particular relates to an asphalt modifier, modified emulsified asphalt containing the modifier, asphalt mixture containing the modified asphalt and their respective preparation methods. Background technique [0002] Emulsified asphalt is the base asphalt that is usually used at high temperature, through mechanical stirring and chemical stabilization, diffused into water and liquefied into a liquid asphalt with low viscosity and good fluidity at room temperature. Emulsified asphalt can be mixed with mineral powder and other aggregates at room temperature to obtain asphalt mixture, thereby overcoming the problems of hot-mix asphalt producing toxic gas and polluting the environment, especially suitable for construction environments such as tunnels with poor ventilation conditions. However, emulsified asphalt has the following problems: (1) It is difficult to control ...

AI Technical Summary

Problems solved by technology

However, emulsified asphalt has the following problems: (1) It is difficult to control the demulsification and the solidification speed is slow, which brings trouble and inconvenience to construction and open traffic; (2) The performance is low, such as insufficient coating and adhesion, and the asphalt pavement is easy to Cracks, resulting in short road life and increased road maintenance costs

Ordinary Portland cement is used as a curing agent, the hydration speed is slow, the early strength performance of the mixture is not superior, and a large amount of mixing water cannot be converted into solid crystal water, which also has a certain impact on the later road performance

[0005] It can be seen that although the commonly used modifiers and curing agents can improve the performance of emulsified asphalt asphalt mixture to a certain extent, they still cannot fully meet the high requirements for repair time and pavement performance of urban arterial roads and expressways.

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