- 杜鲁飞1，陈柄丞1，2，孙巍巍1，孙溪晨3，冯 君3，*
2023年第10期
摘要
引用本文
摘 要：基于微生物诱导碳酸钙沉积（MICP）原理，用尿素、CaCl2溶液和巴氏芽孢杆菌溶液按一定比例配制了自修复剂，通过抗压、抗折、单轴拉伸、单根纤维拉拔试验，研究了自修复剂对工程水泥基复合材料（ECC）力学性能的影响。结果表明：掺入自修复剂后，ECC试件的28 d抗压强度提高了8.96%，抗折强度提高了6.73%，极限拉伸强度提高了12.68%，纤维桥接应力提高了9.38%；由于纤维表面的MICP作用，纤维与基体界面的化学黏结能减小，摩擦黏结强度增大，纤维更容易脱黏进入滑移阶段，从而使ECC的多缝开裂特征更明显。
Abstract: Based on the principle of microbial induced carbonate precipitation(MICP), the self repairing agent was prepared by using urea, CaCl2 solution and Sporosarcina pasteurii solution in a certain proportion. The effects of the self repairing agent on the mechanical properties of engineered cementitious composites(ECC) were studied through compressive, flexural, uniaxial tension and single fiber pull-out tests. The results show that after adding self repairing agent, the 28 d compressive strength of ECC specimens is increased by 8.96%, the flexural strength is increased by 6.73%, the ultimate tensile strength is increased by 12.68%, and the fiber bridging stress is increased by 9.38%. Due to the MICP effect on the fiber surface, the chemical bonding energy between the fiber and the matrix interface decreases, the frictional bonding strength increases, and the fiber is more prone to debonding and entering the slip stage, which makes the multi seam cracking characteristics of ECC more obvious.
杜鲁飞,陈柄丞,孙巍巍,等.微生物诱导碳酸钙沉积对ECC力学性能的影响[J].混凝土与水泥制品,2023(10):50-55.
DU L F,CHEN B C,SUN W W,et al.Effect of microbial induced carbonate precipitation on the mechanical properties of ECC[J].China Concrete and Cement Products,2023(10):50-55.
