土木与环境工程学报（中英文）2024，Vol.46Issue(5)：135-142,8.DOI:10.11835/j.issn.2096-6717.2023.115
增强再生骨料固载混菌对混凝土裂缝自修复性能的影响试验研究
Experimental study on the effect of microbial consortia-enhanced recycled concrete aggregates on the self-healing performance of concrete cracks
摘要
Abstract
Microbial induced carbonate precipitation can achieve the crack self-healing in concrete.Bacterial carrier can effectively improve the survival rate of bacteria in concrete matrix and thus improve the crack self-healing effect in concrete.However,the potential decrease in mechanical properties,poor compatibility with the cementitious matrix and relatively high cost of the current bacterial carrier cannot be ignored.The self-healing concrete based on enhanced recycled concrete aggregate as bacterial carrier is proposed in this paper.The influence of enhancement time of recycled concrete aggregate on compressive strength and self-healing capacity of concrete was studied to determine the reasonable mineralization enhancement time of recycled concrete aggregates,and the enhancement mechanism of recycled concrete aggregates and self-healing mechanism of concrete are revealed.The experiment result shows that the reasonable enhancement time of recycled concrete aggregates is 7 days,the water absorption and crushing index of enhanced recycled concrete aggregates decrease by 20.5%and 9.5%,the compressive strength of concrete prepared with the enhanced recycled concrete aggregates increased by 8.6%.After 56d of curing and healing,the average value of healed crack widths and completely healing percentages of the concrete prepared with enhanced recycled concrete aggregates are 0.44 mm and 73%,respectively.The surface precipitates on the enhanced recycled concrete aggregates exhibit regular cubic shapes and the crystals of these precipitates are calcite.The crack-filling precipitation crystals of the self-healing concrete exhibit regular cubic shapes and cluster shapes.The crystals of these precipitations are calcite and aragonite.关键词
微生物矿化/增强再生骨料/混菌/裂缝自修复/抗压强度Key words
microbial mineralization/enhanced recycled concrete aggregates/microbial consortia/crack self-healing/compressive strength分类
建筑与水利引用本文复制引用
韩瑞凯,张家广,马奥炜,李真真,周爱娟..增强再生骨料固载混菌对混凝土裂缝自修复性能的影响试验研究[J].土木与环境工程学报（中英文）,2024,46(5):135-142,8.基金项目
山西省基础研究计划(202203021221065) Basic Research Program of Shanxi Province(No.202203021221065) （202203021221065）
