A semi-rigid base material for expressway and its preparation process

Abstract

The invention discloses a semi-rigid base material for a highway. The semi-rigid base material is prepared from following materials in mass fraction: a stable mixture, mixed aggregate, cement fly ash-bound hoggin, granular asphalt, an early strength agent, high-elasticity fiber, crushed quartz stone, an anti-shrink additive, cement soil, polymer concrete and a salt additive. The invention furtherprovides a preparation process of the semi-rigid base material for the highway. The process comprises the following steps: step 100, dividing the raw materials into a base material group, an anti-shrink material group, a stress change agent group and a durability modifier group in proportion; step 200, adding water to the base material until the base material is in a semi-bonding state, controlling conditions and adding the anti-shrink material and the stress change agent until the material is in a mortar state, adding the durability modifier and mixing the materials to obtain a primary blended material; step 300, performing multistage development on the primary blended material to obtain a multistage finished material, and laying the multistage finished material in stage sequence. The semi-rigid base material obtained with the formula and the process has good temperature retraction resistance and corrosion resistance and high permeation resistance and durability.

Description

technical field [0001] The invention relates to the technical field of road construction, in particular to an expressway semi-rigid base material and a preparation process. Background technique [0002] With the rapid development of my country's national economy, various regions are carrying out a large number of road construction projects in full swing, and the demand for engineering materials such as gravel, gravel, and sand has increased geometrically. For the widely used semi-rigid base materials at this stage, the crushed stone layer is mainly stabilized by cement, which requires a large amount of crushed stone and sand materials. The gravel, sand and other materials in the project construction are mainly obtained through blasting mountain gravel, dredging river sand and other channels, which seriously damages the ecological environment and does not meet the development requirements of an environment-friendly society and a resource-saving society. At the same time, a l...

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Problems solved by technology

[0006] (1) The general semi-rigid base material mainly uses cement stone with a high temperature shrinkage coefficient as the aggregate raw material, which leads to temperature shrinkage of the internal structure of the semi-rigid base after forming, and poor shrinkage resistance. When the internal structure is easily deformed, the road is damaged and the service life is reduced, and the shrinkage resistance of the semi-rigid material in the above reference document has not been improved;

[0007] (2) At the same time, the internal structure and materials of the general semi-rigid base are not only prone to water seepage and corrosion, but also the strength of the initial forming and later forming cannot meet the requirements, and cannot be used for a long time

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