摘要
粉煤灰具有颗粒细、相对质量密度小、孔隙比大的特点,为了实现粉煤灰的有效利用和粉尘污染控制,应用微生物诱导碳酸盐沉淀(MICP)方法,考虑自然蒸发和湿缸养护两种条件,研究了微生物反应机理、强化特性及影响因素。结果表明:①微生物在粉煤灰中产生的碳酸钙为方解石,含量从7%最大增加到15.3%;②MICP湿缸固化条件下,无侧限抗压强度最大提高6.55倍,达97.63 kPa;③固化强度随营养物浓度的增加表现为先增大后降低,保湿缸和自然蒸发条件下的最佳营养浓度分别为0.5 mol/L和1.0 mol/L;④微生物固化粉煤灰可以减少内部水分损失,保水效果明显,还具有良好的抑尘应用前景。
The coal ash has the characteristics of fine particles,small specific gravity and large pore ratio.In order to achieve effective utilization of the coal ash and dust pollution control,the microbial induced carbonate precipitation(MICP)method is used,considering natural evaporation and wet cylinder maintenance conditions,to study the mechanism of microbial response,strengthening characteristics and influencing factors.The results show that:(1)The calcite is the calcium carbonate produced by microorganisms in the coal ash,and the content increases from 7%to 15.3%.(2)Under the MICP wet cylinder curing conditions,the maximum unconfined compressive strength increases by 6.55 times,reaching 97.63 kPa.(3)The solidification strength first increases and then decreases with the increase of the nutrient concentration,and the optimal nutrient concentrations under moisturizing cylinder and natural evaporation conditions are 0.5 and 1.0 mol/L,respectively.(4)The microbial-derived calcium carbonate can reduce the water loss in ash samples and has a significant water retention effect,indicating good prospects for dust suppression applications.
作者
王子文
魏然
吴帅峰
田继雪
梁树军
WANG Ziwen;WEI Ran;WU Shuaifeng;TIAN Jixue;LIANG Shujun(State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research,Beijing 100048,China;MWR Key Lab of Key Lab of Construction and Safety of Water Engineering,China Institute of Water Resources and Hydropower Research,Beijing 100048,China;Beihang University,Beijing 102206,China;Shijingshan Thermal Power Plant of Beijing Jingneng Power Co.,Ltd.,Beijing 100000,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2023年第S01期88-91,共4页
Chinese Journal of Geotechnical Engineering
基金
国家重点研发计划课题(2019YFC1509800)
引江济淮公司科研项目(YJJH-ZT-ZX-20221130515)