Fiber-toughened cement-emulsified asphalt-based mixture and preparation method thereof

Abstract

The invention relates to the field of preparation of highway asphalt pavement materials, and particularly relates to a fiber-toughened cement-emulsified asphalt-based mixture and a preparation method thereof. The fiber-toughened cement-emulsified asphalt-based mixture comprises the following ingredients in parts by weight: 0.1-0.6 part of brucite mineral fiber, 1-5 parts of cement, 1-10 parts of emulsified asphalt, 0.5-2.0 parts of bisphenol A-type epoxy resin, 0.2-0.6 part of diethylenetriamine and 81.4-95.0 parts of aggregate. The method comprises the following steps of: adding the brucite mineral fiber into aggregate and performing dry mixing in a room-temperature condition; adding a proper amount of water, and mixing again; sequentially adding the emulsified asphalt, the bisphenol A-type epoxy resin and the diethylenetriamine, and mixing; and finally, adding the cement and uniformly mixing to obtain the fiber-toughened cement-emulsified asphalt-based mixture. The fiber-toughened cement-emulsified asphalt-based mixture provided by the invention can improve the tensile deformation ability, low-temperature crack resistance and fatigue rupture resistance of the cement emulsified-asphalt mixture and prolong the service life of pavement; and the construction process is simple to operate and economical and environment-friendly.

Description

technical field [0001] The invention relates to the field of preparation of highway asphalt pavement materials, in particular to a fiber-reinforced cement emulsified asphalt-based mixture and a preparation method thereof. Background technique [0002] In recent years, researchers generally believe that the short service life of asphalt pavement and poor durability of pavement structure in my country have a certain relationship with the uniform use of semi-rigid base asphalt pavement structure in China. The analysis shows that the semi-rigid base asphalt pavement has many problems, and some problems are even unsolvable. For example, the semi-rigid base is prone to shrinkage and cracking, which will lead to reflection cracks in the asphalt surface; the semi-rigid base has weak erosion resistance and is prone to mud pumping; the semi-rigid base has no healing ability after damage and is difficult to repair; the semi-rigid asphalt Unstable ruts are prone to occur on the road su...

AI Technical Summary

Problems solved by technology

[0004] However, the currently used cement-emulsified asphalt mixture, although utilizing the hydration reaction of cement to accelerate the demulsification process of emulsified asphalt to improve its early strength, does not pay attention to the bridging effect between the organic and inorganic binders , only rely on the self-reaction of cement and emulsified asphalt to provide cohesion, and the composite effect of the material is not fully utilized, so the performance and durability of conventional cement emulsified asphalt mixtures are insufficient

On the other hand, although the addition of cement accelerates the development of the early strength of emulsified asphalt mixture, it also greatly improves the modulus of the mixture, which increases the risk of brittle cracking of cement-emulsified asphalt concrete. The toughness and deformation properties have been reduced to a certain extent, which is also very unfavorable for improving the service life of the pavement

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