Experimental Research On The Corrosion Resistance Of New Material Based On MICP Technology

As a global ecological problem, desertification is concerned by more and more countries. The situation of land desertification is even more serious in China. Many effective measures have been taken to prevent and control the desertification, but the desertification still develops at fast speed. As a result, the traditional methods of desertification control can’t meet the requirement of current desertification control, and there is an urgent need for a new way of desertification control. Microbial mineralization material is a new type of environment-friendly materials, which is derived from loose sand through microbial-induced calcium carbonate precipitation. If this soil consolidation can be employed in the land desertification, it will be able to accelerate the desertification control in China, and bring tremendous environmental and economic benefits.Greater demands are being placed on the durability of microbial mineralization material due to the complex ecological environment in the desert. The acid and alkali corrosion resistance is one of the important parts in the material durability, and so the research on acid and alkali corrosion resistance of the material is necessary, which can provide theoretical basis for the follow-up durability study.In this paper, a new method was introduced to prepare a new microbial mineralization material with standard sand and aeolian sandy soil in the lab. The reasonable cure time of this artificial material was explored in the test and its mechanism of microbial-induced mineralization was researched through the electron microscope scanning test and chromatographic test. Finally with unconfined compressive strength test and mathematical methods, the resistance of this microbial mineralization material was analyzed in the lab.The experiment shows that the self-design reactor to prepare microbial mineralization material was proved to be simple and effective. The reasonable mineralization time of microbial mineralization material from standard sand is 7 days. Calcium ions in the materials increase dramatically as the curing time extends. The bacterial cells attached with calcium ions serve as crystallization nucleus, and fill the pore space of material. They grew fully and were evenly distributed, binding sand particles effectively. The strength of microbial mineralization material derived from standard sand demonstrates a tendency of being lower, then higher, lower in the acid solution. The worst resistance to acid erosion Of MICP-stand sand lies in the 4 g/L acid solution. The elastic-plastic of microbial mineralization material wasn’t changed by the acid and alkali corrosion in the test. Theresults indicate that microbial mineralization is a acid resistant material instead of a alkali resistant material, and microbial mineralization materials which were prepared in the high concentration of bacteria liquid have the stronger resistance to acid and alkali corrosion.