Semi-rigid asphalt pavement material and preparation method thereof

Abstract

The invention relates to a pavement engineering material, and concretely relates to a semi-rigid asphalt pavement material and a preparation method thereof. The semi-rigid asphalt pavement material comprises, by volume, 75-85% of a macro-porous asphalt mixture and 15-25% of a grouting material; the macro-porous asphalt mixture is obtained through mixing mineral, a filler and rubber high-viscosity modified asphalt; and the grouting material is obtained through mixing fine particle modified emulsified asphalt, PC42.5 composite Portland cement, an active admixture, sands, water, a water reducer, an aluminum powder, an expanding agent, an air entraining agent, an antifoaming agent and limestone mineral powder. The semi-rigid asphalt pavement material has the advantages of good construction workability, strong high-temperature rut resistance and low-temperature cracking resistance, good durability, long fatigue life, good combination property of the macro-porous asphalt mixture with the grouting material, small temperature shrinkage and dry shrinkage cracks, energy saving, environmental protection, and realization of the high cost performance of recycling of solid wastes.

Description

technical field [0001] The invention relates to pavement engineering materials, in particular to a semi-rigid asphalt pavement material and a preparation method thereof. Background technique [0002] Asphalt concrete pavement belongs to flexible pavement and is the main structural form of highway and urban road pavement in my country. It has good driving comfort, smooth surface, low noise and excellent skid resistance. At the same time, it has a high degree of mechanization in construction applications and fast construction. Simple maintenance and other features. However, with the rapid increase of traffic volume and vehicle load in recent years, asphalt concrete pavement produces plastic deformation under the repeated action of vehicle load, resulting in rutting, hugging, moving and other high-temperature performance and insufficient strength. Traffic light intersections and evaluation crossings of resource-carrying roads and urban roads are very prominent, which seriously ...

AI Technical Summary

Problems solved by technology

However, the traditional macroporous asphalt mixture uses polymer-modified asphalt as the cementing material, which not only has high cost, but also has high viscosity at high temperature, poor construction workability, and high energy consumption for construction.

Low viscosity at low temperature, on the one hand, cannot provide sufficient bonding strength for large-pore asphalt mixture, causing construction vehicles and grouting equipment to further compress the internal voids during construction, resulting in difficulty in grouting, internal grouting is not dense, and affects the overall durability of the pavement On the other hand, when the viscosity is low, the polymer-modified asphalt film attached to the surface of the stone is very thin, which greatly reduces the ability of the semi-rigid asphalt pavement to resist low temperature cracking, base reflection cracking and fatigue cracking

Also, in order to ensure that the semi-rigid asphalt pavement has sufficient mechanical strength and fluidity required for grouting, a large amount of cement material and mixing water are often added, which increases the cost and energy consumption of the entire construction process

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