微生物水泥基材料的红外光谱研究

Study on infra-red spectra of microbe cementitious materials

微生物水泥是在节能减排大环境下而研发的一种新型生物水泥。利用X射线衍射(XRD)、透射电镜(TEM)和红外光谱(IR)分别对微生物水泥基材料的成分、形貌、微观结构进行了研究。TEM分析表明,微生物水泥基材料内部微观结构与化学法浇注的砂颗粒内部微观结构不同。微生物矿化形成的方解石可以胶结松散颗粒,而化学法形成的方解石与松散颗粒之间存在孔隙,不能胶结松散颗粒;IR分析表明,微生物水泥基材料中的Si—O键和C—O键频率均发生红移,而化学法浇注的砂颗粒中Si—O键和C—O键频率未发生改变,另外,化学法浇注的砂颗粒中Si—O键与单纯石英砂中的Si—O键频率相同。

Microbe cement was a new kind of biological cement due to the ever increasing awareness of environmental protection. The composition, morphology and microstructure were researched by X-ray diffraction （XRD）, transmission electron microscope （TEM） and infra-red spectra （IR）. TEM results showed that the microstructure of microbe cementitious materials was different with that by chemical methods. The calcite produced by microbial could bind loose particles and that produced by chemical methods could not bind particles. IR results indicated that the frequency of Si-O and C--O took up the extent of the red shifts. However, the frequency of Si-O and C-O could not change. Moreover, the frequency of Si-O at quartz sand by chemical method and at pure quartz sand was the same.