Al-Salloum Yousef, Abbas H, Sheikh Q I, Hadi S, Alsayed Saleh, Almusallam Tarek
MMB Chair for Research and Studies in Strengthening and Rehabilitation of Structures, Department of Civil Engineering, College of Engineering, King Saud University, Riyadh 11421, Saudi Arabia.
Department of Molecular Biology and Biotechnology, University of Sheffield, United Kingdom.
Saudi J Biol Sci. 2017 Feb;24(2):286-294. doi: 10.1016/j.sjbs.2016.01.016. Epub 2016 Jan 14.
, a common soil bacterium has been tested for microbial treatment of cement mortar. The present study also seeks to investigate the effects of growth medium, bacterial concentration and different buffers concerning the preparation of bacterial suspensions on the compressive strength of cement mortar. Two growth media, six different suspensions and two bacterial concentrations were used in the study. The influence of growth medium on calcification efficiency of was insignificant. Significant improvement in the compressive as well as the tensile strength of cement mortar was observed. Microbial mineral precipitation visualized by Scanning Electron Microscopy (SEM) shows fibrous material that increased the strength of cement mortar. Formation of thin strands of fillers observed through SEM micrographs improves the pore structure, impermeability and thus the compressive as well as the tensile strengths of the cement mortar. The type of substrate and its molarity have a significant influence on the strength of cement mortar.
一种常见的土壤细菌已被用于水泥砂浆微生物处理的测试。本研究还旨在探讨生长培养基、细菌浓度以及制备细菌悬液时使用的不同缓冲剂对水泥砂浆抗压强度的影响。研究中使用了两种生长培养基、六种不同的悬液和两种细菌浓度。生长培养基对[细菌名称未给出]钙化效率的影响不显著。观察到水泥砂浆的抗压强度和抗拉强度有显著提高。通过扫描电子显微镜（SEM）观察到的微生物矿物沉淀显示出纤维状物质，其增强了水泥砂浆的强度。通过SEM显微照片观察到的细束状填料的形成改善了孔隙结构、不透水性，从而提高了水泥砂浆的抗压强度和抗拉强度。底物的类型及其摩尔浓度对水泥砂浆的强度有显著影响。
