微生物诱导碳酸钙沉积固化建筑渣土抗风蚀扬尘影响因素的试验研究

Experimental Study on Influence Factors of Anti-Wind Erosion and Anti-Dust for Construction Debris Cemented by MICP

为研究钙源、胶结液浓度、菌液浓度、温度和胶结液pH值等对微生物诱导碳酸钙沉积(MICP)固化渣土抗风蚀和扬尘的影响,开展了单因素正交MICP固化建筑渣土试验和风洞试验,同时辅以X射线三维显微镜和X射线衍射等微观手段。试验结果表明:以氯化钙为钙源,胶结液浓度为0.5 mol/L,菌液浓度(OD600值)为4.0,温度为20~40℃,中性或弱碱性环境下MICP固化建筑渣土抗风蚀效果教佳;MICP固化建筑渣土的易溶盐含量和pH值最大增幅分别为0.92%和0.20,MICP固化建筑渣土兼具环境友好的特性。

In order to systematically study the effect of calcium sources, cementitious solution concentrations, bacteria liquid concentrations, temperatures and pH values of microbial cementitious liquids on the resistance capacity of fugitive dust and wind erosion of construction debris cemented by microbial induced calcite precipitation(MICP), single-factor orthogonal tests cemented construction debris by MICP and wind tunnel tests were conducted, assisted by SEM and XRD microscopic methods. The test results showed that using calcium chloride as a calcium source, the concentration of the cementitious solution was 0.5 mol/L, the concentration of the bacterial liquid(OD600) was 4.0, the temperature was 20 to 40 ℃, and the resistance effect of wind erosion for construction debris cemented by MICP in the neutral or weakly alkaline environment was better. The maximum increments of the soluble salt content and the pH value in construction debris cemented by MICP were 0.92% and 0.20 respectively, and the method to cement construction debris by MICP was of the advantage of environmental friendliness.