1 State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China 2 State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution, Chengdu University of Technology, Chengdu 610059,China
Abstract: Land degradation is a major problem threatening human survival and development. Soil stabilization has been hotspots for scholars at home and abroad. Physical stabilization measures such as dynamic compaction, fiber stabilization and geotextile can reinforce the soil. However, compared with physical stabilization measures, the chemical stabilization of soil with soil stabilizer has the advantages of high strength, low cost and low pollution, which has attracted the attention of many researchers. Soil stabilizers are divided into calcium-based soil stabilizers and non-calcium-based soil stabilizers. Traditional calcium-based stabilizers (such as cement, fly ash, and lime) have the disadvantages of serious pollution, long curing time and damage to soil functions, which are mostly used in roads and construction fields. Non-calcium-based soil stabilizers are the best choice in the application fields of desertification control, slope restoration, soil and water conservation and others, required to not only have excellent solidification performance, but also have good ecological properties. Non-calcium-based stabilizers can be divided into polymer stabilizers, biological enzyme stabilizers and ionic stabilizers, according to the chemical composition. The curing mechanisms of various stabilizers are different. The polymer stabilizers mainly strengthen the soil through gel adsorption, wrapping and filling. The biological enzyme stabilizers mainly reinforce the soil by enzyme-catalyzed ion exchange reaction between cations on the surface of soil particles and soil organic matter. The ionic stabilizers accelerate the ion exchange reaction rate and reduce the hydrophilicity of soil particles to achieve soil stabilization. The application performance of non-calcium-based stabilizers is divided into engineering performance and ecological performance. The engineering performance is reflected in improving the mechanical properties of soil and strengthening the anti-erosion ability and anti-deformation ability of soil, while the ecological performance is mainly manifested in improving soil water holding capacity and indirectly promoting plant growth. In this paper, the research progress of non-calcium-based stabilizers is summarized. The curing mechanisms of non-calcium-based stabilizers are introduced. The engineering and ecological performance of non-calcium-based stabilizers is combed. In addition, the future development of non-calcium-based stabilizers is also prospected.
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