Low-shrinkage and high-strength aeolian sand subgrade material and preparation method thereof

Abstract

The invention discloses a low-shrinkage and high-strength aeolian sand subgrade material and a preparation method thereof. The material comprises, by mass, 74-78% of aeolian sands, 6-8% of cement, 1.5-2.5% of a nanomaterial, 0.1-0.5% of polyvinyl alcohol, 0.2-0.8% of a polymer emulsion, 0.5-1.2% of water glass, and the balance of water. The aeolian sand subgrade material prepared in the inventionhas the advantages of low shrinkage rate, high strength, good waterproof performance, reduction of the influences of water on the stability of the aeolian sand subgrade, realization of wide application of an aeolian sand subgrade construction technology in the northwest region, improvement of the construction quality, and good economic and environmentally-friendly benefits.

Description

technical field [0001] The invention relates to road engineering materials, in particular to a low-shrinkage, high-strength solidified aeolian sand roadbed material and a preparation method thereof. Background technique [0002] my country's desertified land has reached more than 1.7 million square kilometers, accounting for more than 18% of the country's land area, affecting 30 first-level administrative regions, provinces, autonomous regions, and municipalities directly under the Central Government. The eight major deserts and the four major sandy lands are the main sand sources in my country, and there are sporadic sandy lands along the rivers, rivers, and seas in the south. Subgrade filling materials in desert areas are limited, and aeolian sand is an extremely abundant and highly regional material in Northwest China. The cost of road construction can be greatly reduced. At the same time reduce the environmental pollution caused by aeolian sand. [0003] At present, t...

AI Technical Summary

Problems solved by technology

However, the above-mentioned SH sand-fixing agent is for new sand-fixing vegetation materials, not for roadbed materials in desert areas. In the extremely dry environment of desert areas, roadbed materials need to have high strength to ensure load-bearing and low shrinkage to prevent road cracks. In contact with wet strata, good water resistance is required to prevent erosion by groundwater, which cannot be met by existing technologies

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