摘要
采用XRD,SEM,超声波及混凝土碳化分析研究了细菌诱导矿化材料晶相、生长形貌、与基层的黏结及对混凝土抗碳化性能的影响.结果表明:细菌诱导碳酸钙沉积晶相为方解石和球文石;对于菌种Sporosarcina pasteurii,Ca2+源影响其沉积晶相,培养基中肉汤影响晶体生长形貌;矿化材料在试样表层均匀沉积生长,与基层形成有效黏结,并可有效提高混凝土的抗碳化性能.细菌诱导矿化材料可应用于历史建筑的修复保护与混凝土结构耐久性的改善.
An experimental study was carried out to investigate potential applications of bacterially induced mineralized materials of calcium carbonate on eoncrete surface. The crystal phase and growth morphology of the deposited mineral layer were analyzed by using XRD and SEM. The bond behavior between the deposited mineral and substrate was measured with utralsonication. The durability of modified concrete was studied through an accelerated carbonation test. Experimental results show that phases of mineral crystal are calcite and vaterite. For bacterium Sporosarcina pasteurii, calcium source has an effect on the phase of calcium carbonate mineralization, and the crystal shape of calcium carbonate is influenced by nutrient broth in culture medium. The crystal is deposited uniformly on the concrete surface, mineral crystals are strongly bonded to the substrate resulting in a great improvement of anti-carbonation of concrete. Evidence show that bacterially induced mineralized materials has a great potential for remedy of historic buildings and improvement of concrete durability.
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2009年第4期482-486,共5页
Journal of Building Materials
基金
国家自然科学基金资助项目(50678127)
国家科技支撑计划课题(2006BAJ03A07-04)资助项目
关键词
细菌
生物矿化
生物修复
耐久性
碳化
历史建筑保护
bacterium
biomineralization
bioremediation
durability
carbonation
historic building conservation
