嗜碱芽孢杆菌H4对再生骨料性能的改性研究  

Modification of regenerated aggregate by bacillus basophilus H4

作　　者：魏红俊 闫洪生[2] 朱亚光[2] 徐培蓁[2] 王新波 崔永清 WEI Hongjun;YAN Hongsheng;ZHU Yaguang;XU Peizhen;WANG Xinbo;CUI Yongqing(Qingdao Building Energy Conservation and Housing Industrialization Development Center,Qingdao 266061,China;Department of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China;Qingdao Construction Engineering Management Service Center,Qingdao 266071,China;Qingdao Housing Safety Service Center,Qingdao 266071,China)

机构地区：[1]青岛市建筑节能与住宅产业化发展中心,山东青岛266061 [2]青岛理工大学土木工程学院,山东青岛266033 [3]青岛市建筑工程管理服务中心,山东青岛266071 [4]青岛市房屋使用安全服务中心,山东青岛266071

出　　处：《混凝土》2023年第5期65-71,共7页Concrete

基　　金：国家自然科学基金面上项目(51578342);中国博士后科学基金(2015M582418)。

摘　　要：随着再生骨料性能改性研究的深入,以及微生物诱导碳酸盐沉积研究的进展,研究者提出可将微生物用于再生骨料强化处理中。试验研究好氧型嗜碱芽孢杆菌H4矿化活性的最优条件为细菌浓度108个/m L、环境温度25℃、钙离子浓度10 g/L、pH值为10、矿化沉积时间15 d。根据最优条件配制H4细菌矿化液对再生骨料进行浸泡和喷淋处理,通过处理前后再生骨料的吸水率、压碎指标、表观密度、孔隙结构及微观形貌的变化得出喷淋处理对骨料的改性效果优于浸泡处理,喷淋改性后不同粒径再生吸水率降低幅度介于21.9%~32.8%之间,粗骨料压碎指标降低15.9%,孔隙率降低26.1%,SEM-EDS分析可知矿化后再生骨料表面产生大量碳酸钙。With the development of the research on the performance modification of regenerated aggregate and the development of the study on microbe induced carbonate deposition,the researchers proposed that microorganisms could be used in the enhanced treatment of regenerated aggregate.The optimal conditions for the mineralization activity of aerobic basophilic bacillus H4 were as follows bacterial concentration of 108/mL,ambient temperature of 25℃,calcium ion concentration of 10 g/L,pH value of 10,mineralization deposition time of 15 d.According to the optimal conditions,H4 bacterial mineralization solution was prepared for soaking and spraying treatment of recycled aggregate.According to the changes of water absorption,crushing index,apparent density,pore structure and microscopic morphology of recycled aggregate before and after treatment,it was found that the modification effect of spraying treatment on aggregate was better than that of soaking treatment.After spraying modification,the water absorption rate of different particle sizes decreased from 21.9%to 32.8%,the crushing index of coarse aggregate decreased by 15.9%,and the porosity decreased by 26.1%.According to SEM-EDS analysis,a large amount of calcium carbonate was produced on the surface of the mineralized recycled aggregate.

关 键 词：微生物 嗜碱芽孢杆菌H4 矿化沉积 浸泡 喷淋 

分 类 号：TU528.01[建筑科学—建筑技术科学]