Method for biomimetic mineralization and cementation of loose sand grains

Abstract

The invention belongs to the technical field of foundation reinforcement, and discloses a method for biomimetic mineralization and cementation of loose sand grains, which comprises the following steps: preparing L-aspartic acid and calcium chloride into a CaCl2-L-Asp mixed solution, and adjusting the pH value of the solution; preparing sodium carbonate into a Na2CO3 solution; after the CaCl2-L-Asp mixed solution is immersed into the loose sand body, the Na2CO3 solution with the same volume as the CaCl2-L-Asp mixed solution is immersed into the loose sand body; and the loose sand body completes the designed immersion cycle number, and cementing is completed after the interior of the sand body is dried. The method does not need to culture microorganisms, has no harsh cementation environment, and is green and environment-friendly; meanwhile, the cementing process is easy to operate, and the time cost is low; the sand body obtained through the method has high strength and high practicability.

Description

technical field [0001] The invention belongs to the technical field of foundation reinforcement, and in particular relates to a method for cementing loose sand particles into a sand body. Background technique [0002] With the continuous urbanization, our country is building or renovating basic buildings almost every moment. During this process, it is inevitable to encounter some soils that need to be reinforced by artificial means to meet the needs of engineering construction. At present, the traditional foundation treatment technology usually uses large mechanical equipment and artificial synthetic materials to physically and chemically strengthen the soil, so as to improve the mechanical properties of the soil to achieve the reinforcement effect. The common methods are: dynamic compaction method, replacement method, preloading method Or mix cement, lime, epoxy resin, sodium silicate, polyurethane, etc. into the soft soil. [0003] At present, the widely used foundation ...

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Problems solved by technology

[0011] The present invention focuses on solving the technical problems encountered in the practical application of MICP technology, such as harsh microbial growth environment, difficult control of microbial distribution in situ activity, strong pollution of by-products, etc., and provides a method for cementing loose sand grains through bionic mineralization. This method uses L-aspartic acid (L-Asp) as a crystal form regulator, which is fast in cementation, environmentally friendly and has no by-products, and the cemented sand body has a certain compressive strength

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