李沛豪¹，屈文俊²
(1 浙江工业大学建筑工程学院，杭州310014; 2 同济大学土木工程学院，上海200092)

[摘要] 针对石砌古建筑修复保护，开展细菌诱导矿化沉积修复加固石质试件试验。采用X衍射仪、扫描电镜、压汞仪及超声波研究分析了沉积晶体晶相、沉积层生长及形貌、沉积对试件孔隙影响以及沉积层黏结与保护效果。结果表明：矿化晶体为方解石和球文石，沉积晶体在试件的表面均匀沉积，并形成了有效地防护层，沉积对孔隙分布无显著影响，但致使试件孔隙率减小22.2%，沉积层与基层可形成有效黏结。细菌修复加固可作为一种有效的石砌古建筑保护方法。
[关键词] 石砌古建筑；细菌；生物矿化；生物修复加固

    Remediation of ancient masonry buildings by bacterially induced biomineralization
    Li Peihao¹, Qu Wenjun²
    (1 College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 3 10014, China; 2 College of Civil Engineering, Tongji University, Shanghai 200092, China)

Abstract: Laboratory experiments were conducted to consolidate ancient masonry buildings by bacterially-induced calcium carbonate precipitation to form a deposition layer on the surface of marble samples. The effects of crystal phase and growth of the mineralized layer as well as the deposited crystal on the porosity of samples and on the efficiency of bonding and protection were analyzed by means of XRD, SEM, mercury intrusion porosimeter (MIP) and ultrasonic test. Experimental results show that the mineral crystal is composed of calcite and vaterite phases, that bacteria act as nucleation sites in the precipitation of the mineral crystal uniformly depositing on the sample surface, that the precipitation has no significant effect on the pore size distribution of samples rather than results in a porosity decrease by 22.2%, and that the mineral crystal strongly attaches the substratum. It is thus concluded that the bacterially-induced biomineralization is effective in remediating ancient masonry buildings.
Keywords: ancient masonry building; bacterium; biomineralization; bioremediation