Expansive soil modifier and method of use thereof

Abstract

The invention discloses an expansive soil modifier, which comprises the following components by weight percentage: 33%-70% of aluminum sulfate octadecahydrate, 5%-18% of ferric chloride, cetyltrimethylammonium bromide 8% to 20%, polyacrylamide 0.1% to 1%, polyaluminum chloride 8% to 20%, sodium silicate nonahydrate 3% to 8%. The expansive soil modifier of the invention can well suppress the expansion potential of the expansive soil, enhance the unconfined compressive strength, and meet the engineering construction requirements of the "Code for Design of Highway Subgrade" (JTG E30-2004). Moreover, the raw materials for preparing the improving agent are easy to obtain, low in price, non-toxic and harmless, and have no influence on human health and the environment. The improver has good permeability and simple construction. It improves the expansive soil by direct spraying, and then completes the curing of the expansive soil, which greatly reduces the construction cost and the impact of the construction process on people and the environment.

Description

technical field [0001] The invention relates to the technical field of rock and civil engineering, in particular to an expansive soil modifier and a using method thereof. Background technique [0002] Expansive soil is widely distributed in my country, and its mineral composition is mainly composed of illite and montmorillonite, with a small amount of kaolinite included. These hydrophilic clay minerals swell when exposed to water, shrink when dehydrated, and have obvious expansion and contraction properties. Multiple cracks and super-consolidation can easily cause accidents such as subsidence, sliding, longitudinal cracking, and collapse. In the construction of highways, railways, water conservancy, industrial and civil buildings, etc., it is inevitable to pass through the expansive soil area. In order to ensure the construction and safety of the project construction and use process, it is necessary to carry out necessary treatment on the expansive soil, such as reducing The...

AI Technical Summary

Problems solved by technology

At present, there are two main methods of dealing with expansive soil: physical method and chemical method. Physical methods include: surface water protection, slope protection, support and reinforcement protection, soil replacement method, humidity control method, pile foundation method, etc.; chemical methods Mainly include: adding inorganic salts or organic compounds to expansive soil, improving the interaction between water and soil by catalyzing and activating the surface reaction of soil particles, so that the properties of soil can still reach the established indicators under the influence of water, improving The engineering properties of expansive soil, such as mixing lime and cement into expansive soil, etc., the solidification mechanism of lime is the cementation between silicate and aluminum hydrates and particles, the gradual dehydration of cement and the crystallization of new minerals, Thereby reducing the liquid limit and increasing the shear strength of the soil, but the reaction speed between lime and cement and soil is slow, and the hydrates produced have low strength and poor durability, and the lime content is more than 8%. Only when the dosage is 6% can a certain effect be achieved, the construction cost is relatively high, the construction needs to be mixed evenly repeatedly, the cycle is long, time-consuming, and it is not easy to grasp, and it is prone to quality hidden dangers. At the same time, it also has problems such as polluting the environment and not being conducive to greening

Images