Investigation of cement mortar incorporating Bacillus sphaericus  

作　　者：Kirti Kanta Sahoo Aparna K.Sathyan Chandni Kumari Pradip Sarkar Robin Davis 

机构地区：[1]Department of Civil Engineering,National Institute of Technology Rourkela,Odisha,India

出　　处：《International Journal of Smart and Nano Materials》2016年第2期91-105,共15页国际智能和纳米材料杂志（英文）

摘　　要：Ureolytic-type bacteria has been used to improve the strength of cement mortar by the precipitation of calcium carbonate.In the present study Bacillus sphaericus has been used to improve the properties of cement mortar such as setting time,compressive strength and sorptivity.The setting time is found to be unaffected by the presence of bacteria.It is found that compressive strength at both 7-days and 28-days of mortar cube increases with the increase of bacteria concentration.At the optimum bacteria dosage of 107 cells/ml,the average compressive strength increases by 58%(at 7 day)and 23%(at 28 day)over the control specimen.The sorpitivity coefficient decreases as the concentration of bac-terial cells increases.The mineralogy and morphology of the cal-cium carbonate precipitation have been tested by XRD and FESEM.

关 键 词：BACTERIA setting time compressive strength calcite precipitation SORPTIVITY 

分 类 号：TU5[建筑科学—建筑技术科学]