Synthesis method and application of hydroxy aluminum expansive soil improver

Abstract

The invention discloses a synthesis method and application of the hydroxy aluminum expansive soil improver, belonging to technical field of geotechnical engineering. The synthesis method of the hydroxy aluminum expansive soil improver comprises the following steps: (1) preparing the 1mol / L AlCl3 solution in a glass beaker, adding into a thermostat magnetic heating stirrer, and heating; (2) after heating the AlCl3 solution to 80 DEG C dropwise adding 0.6mol / L NaOH solution into the AlCl3 solution slowly until the basicity B value is 1.5-2.5; (3) making the content of aluminum in the solution be 0.5mol / L to obtain the hydroxy aluminum expansive soil improver; and (4) constructing 5-60 days after the hydroxy aluminum expansive soil improver is synthesized. The hydroxy aluminum expansive soil improver synthesized by adopting the synthesis method is a weakly acidic solution, causes less influence to the groundwater and the vegetation and is used for safely processing the expansive soil in situ without disturbing the original soil layer.

Description

technical field [0001] The invention relates to geotechnical engineering technology, in particular to a synthesis method and application of a hydroxyaluminum expansive soil modifier. Background technique [0002] The subgrade filling of expansive soil has achieved satisfactory results by adding admixtures such as lime and cement, but the subgrade filling is disturbed soil, and artificial methods can control its filling quality. However, for in-situ foundations and slopes, etc. As far as expansive soil is concerned, there are many difficulties in engineering by adding admixtures such as lime. In addition, the calcium and other mineral components in the above-mentioned admixture will form ettringite, wollastonite, etc. with the sulfur in the soil (usually gypsum), which will cause the roadbed to bulge later and lead to roadbed damage. The interaction between aluminum oxide or aluminum hydroxide and clay minerals plays an important role in soil and water conservation, pollutio...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcoming and deficiency that above-mentioned technology exists, provide a kind of synthetic method of hydroxyaluminum expansive soil modifier and application thereof, promptly synthesize a kind of low pollution, convenient construction hydroxyaluminum expansive soil modifier in laboratory, Used for in-situ treatment of expansive soil engineering problems, essentially improving its hydrophilic properties and expansion and contraction properties, and improving its physical and mechanical properties

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