Engineering Properties of MICP-Bonded Sandstones Used for Historical Masonry Building Restoration
Engineering Properties of MICP-Bonded Sandstones Used for Historical Masonry Building Restoration
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DOI：
10.1061/41165(397)412
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发表时间：
2011-03
期刊：
影响因子：
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通讯作者：
Zuan Yang;X. Cheng;Meng Li
中科院分区：
文献类型：
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作者：
Zuan Yang;X. Cheng;Meng Li
与混凝土、天然灰岩或砂岩沉积物等其他胶结土工材料相比，巴氏孢子八叠球菌（Sporosarcina pasteurii）微生物诱导碳酸盐原位沉淀（MICP）胶结砂岩由于其强度较低而限制了其在土木加固工程中的应用。建立的抗压强度参数和MICP屈服的经验相关性并不令人满意，因为对于大于8 × 10 MPa的单轴抗压强度，几乎没有报告验证数据。本研究采用先进的材料和生物科学方法，在实验室和现场条件下制备具有高强度的MICP胶结砂岩。根据清华大学的前期研究，在酶活性为18 mM/min的尿素水解条件下，连续4周的生物处理，可以得到单轴抗压强度不超过5 MPa的立方体砂岩。使用粗粒和细粒砂，但观察到强度增加很少。研究了原位提供培养料和优化灌浆路线等提高强度的技术。
Compared to many other cemented geo-materials, such as concrete and natural limestone or sandstone sediments, the applications of microbial induced carbonate in-situ precipitation (MICP) bonded sandstones by Sporosarcina pasteurii in many civil strengthening works were limited due to their low strength. The established empirical correlation of the compressive strength parameter and the MICP yield was not satisfactory since little validation data was reported for the uniaxial compressive strength higher than 8∼10MPa. The present study was focused on producing MICP bonded sandstones under laboratory and field conditions with the high strength using advanced material and biological science approach. According to the previous studies carried out at Tsinghua University, the continuous 4 weeks biological treatment with the enzyme activity about 18mM urea hydrolyzed per min could lead to the cubic sandstone with the uniaxial compressive strength (UCS) no more than 5MPa. Coarse-grained and fine-grained sands were used, but little strength gain was observed. Strength improvement technologies were considered and investigated including the in-situ supply of cultivation culture and optimization of grouting route.