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首页> 外文会议>Proceedings of the 2nd international symposium on Asia urban geoengineering >Effect of Water Content on the Strength of Bio-Cemented Sand in Various Drying Process
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Effect of Water Content on the Strength of Bio-Cemented Sand in Various Drying Process

机译：含水量对不同干燥过程中生物胶结砂强度的影响

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摘要

Microbially induced calcium carbonate precipitation (MICP) is a novel ground improvement technique which has promising applications in geotechnical engineering. The research of this technique commonly focuses on calcium carbonate precipitation and geotechnical properties of bio-cemented soil in fully saturated or dry states. However, the natural soil may contain different amount of water, which will have influences on the geotechnical properties of soil. The objective of the present study is to investigate the mechanical properties of bio-cemented sand with different water contents and drying temperatures. During MICP treatment, all the bio-cemented sand samples were prepared at the same cementation level. Meanwhile, two drying temperatures (i.e., 30 ℃ and 60 ℃) were adopted to obtain different water contents. Calcium carbonate content and water distribution were tested, and unconfined compression test was conducted to measure the unconfined compressive strength. The experimental results show that, as the water content increases, the strength decreases firstly and then increases at the same drying process. This phenomenon may be caused by the interaction of pore water and calcium carbonate crystals during the drying period. However, under the same water content, drying in 30 ℃ has more remarkable influences on the strength in comparison with the drying in 60 ℃. The much higher strength obtained by the 30 ℃ drying in dried state implies that different temperatures may change the crystal forms of calcium carbonate.
机译：微生物诱导的碳酸钙沉淀（MICP）是一种新颖的地面改良技术，在岩土工程中具有广阔的应用前景。该技术的研究通常集中在完全饱和或干燥状态下的碳酸钙沉淀和生物水泥土壤的岩土特性。但是，天然土壤可能包含不同量的水，这将对土壤的岩土特性产生影响。本研究的目的是研究不同含水量和干燥温度的生物水泥砂的力学性能。在MICP处理期间，所有生物胶结砂样品均以相同的胶结水平制备。同时，采用两种干燥温度（即30℃和60℃）以获得不同的含水量。测试碳酸钙含量和水分布，并进行无侧限抗压试验以测量无侧限抗压强度。实验结果表明，在相同的干燥过程中，随着含水量的增加，强度先降低后升高。此现象可能是由于干燥期间孔隙水和碳酸钙晶体的相互作用引起的。但是，在相同含水量下，与60℃干燥相比，在30℃干燥对强度有更显着的影响。通过在干燥状态下30℃干燥获得的更高强度意味着不同温度可能会改变碳酸钙的晶体形式。

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