微生物诱导碳酸钙沉淀技术修复劣化古建砖石砌体的试验研究  

Experimentalstudy on the restoration of deteriorated ancient masonry using microbially induced carbonate precipitation technology

作　　者：彭世震 陈诗雨 卓祖磊 高玉朋 林文彬 PENG Shizhen;CHEN Shiyu;ZHUO Zulei;GAO Yupeng;LIN Wenbin(School of Civil Engineering,Fujian University of Technology,Fuzhou 350118;Institute of Earth Sciences and Engineering,Fujian University of Technology,Fuzhou 350118)

机构地区：[1]福建工程学院土木工程学院,福建福州350118 [2]福建工程学院地球科学与工程研究所,福建福州350118

出　　处：《福建建筑》2023年第2期104-109,共6页Fujian Architecture & Construction

基　　金：2022年大学生创新创业训练计划项目(项目编号:S202210388065);福建工程学院科研启动基金(项目编号:GY-Z20091)。

摘　　要：探索利用微生物诱导碳酸钙沉淀(MICP)技术,修复劣化古建砖石砌体的新方法。首先,对取自福建省三明市泰宁县某古建劣化砖石砌体,进行微生物诱导碳酸钙沉淀修复人造贯通裂缝试验。之后,对修复前后砖石进行超声波速试验、三点弯折试验、X射线衍射试验(XRD)和扫描电镜试验(SEM),从其外观、力学性能、材料性质和胶凝矿物成分等方面进行分析。试验结果表明:砖石贯通裂缝被完全修复,且表面致密,颜色与原砖石相近;贯通裂缝修复后抗弯强度最大值为0.67MPa;修复后,砖石贯通面超声波速最大值为1.46m/s,大于非贯通面超声波速的1.28m/s,表明修复后贯通裂缝处胶凝体密实度相对较高。XRD和SEM试验显示,贯通面中沉淀了以球霰石为主的碳酸钙矿物,且主要分布于砖石颗粒的表面和孔隙中,起到了很好的胶结作用。This paper explores a new method of repairing deteriorated ancient masonry by using Microbially Induced Carbonate Precipitation(MICP)technology.In this paper,MICP technology was applied to the restoration of artificial cracks on a deteriorated masonry from an ancient building in Taining County,Sanming City,Fujian Province.In order to evaluate its appearance,mechanical properties,material properties and cementitious mineral composition,ultrasonic test,three-point bending test,X-ray diffraction test(XRD)and scanning electron microscope(SEM)test were carried out on the masonry before and after restoration.The results show that the masonry cracks are completely repaired,and the surface is dense and the color is similar to the original masonry;the maximum flexural strength of the repaired cracks is 0.67MPa;the maximum ultrasonic velocity of the masonry through surface after repair is 1.46 m/s,which is greater than 1.28 m/s of the ultrasonic velocity of the undamaged surface.This means that the cement density is relatively high after restoration.XRD and SEM tests show that calcium carbonate minerals,mainly vaterite,are precipitated in the surface and pores of masonry particles,which play an important role in cementation.

关 键 词：古建砖石 MICP 微生物注浆 XRD试验 SEM试验 

分 类 号：TU5[建筑科学—建筑技术科学]