- 摘 要
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李沛豪1，屈文俊2
(1 浙江工業(yè)大學(xué)建筑工程學(xué)院，杭州310014; 2 同濟大學(xué)土木工程學(xué)院，上海200092)[摘要] 針對石砌古建筑修復(fù)保護，開展細(xì)菌誘導(dǎo)礦化沉積修復(fù)加固石質(zhì)試件試驗。采用X衍射儀、掃描電鏡、壓汞儀及超聲波研究分析了沉積晶體晶相、沉積層生長及形貌、沉積對試件孔隙影響以及沉積層黏結(jié)與保護效果。結(jié)果表明：礦化晶體為方解石和球文石，沉積晶體在試件的表面均勻沉積，并形成了有效地防護層，沉積對孔隙分布無顯著影響，但致使試件孔隙率減小22.2%，沉積層與基層可形成有效黏結(jié)。細(xì)菌修復(fù)加固可作為一種有效的石砌古建筑保護方法。
[關(guān)鍵詞] 石砌古建筑；細(xì)菌；生物礦化；生物修復(fù)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
