- 目录
- 混凝土与制品
- 首页
钙离子对微生物矿化改性再生骨料性能的影响研究
作者：郝小虎，张家广，李珠，赵林
（太原理工大学 建筑与土木工程学院，山西 太原 030024）
摘要：再生骨料可以有效地实现对废弃混凝土的再利用，然而再生骨料存在高吸水率、与水泥砂浆的界面粘结力低等缺陷。基于产脲酶菌矿化沉积特性对再生骨料进行改性处理，考察了钙源、Ca2+浓度对再生骨料吸水率、质量变化率、表观密度和压碎指标等物理力学性能的影响。结果表明，产脲酶菌矿化沉积能够有效提高再生骨料的质量和表观密度，并降低再生骨料的吸水率和压碎指标；再生骨料改性处理后质量增长率可达2%，吸水率可由未改性的5.41%降至2.92%。
关键词：再生骨料；产脲酶菌；矿化沉积；钙离子；改性
中图分类号：TU528.041 文献标识码：A 文章编号：1001-702X（2019）09-0084-04
Study on the effect of calcium ion on the performance of microbial mineralized modified recycled aggregate
HAO Xiaohu，ZHANG Jiaguang，LI Zhu，ZHAO Lin
（College of Architecture and Civil Engineering，Taiyuan University of Technology，Taiyuan 030024，China）
Abstract：Recycled aggregate can effectively realize the reuse of waste concrete. While the defects of high water absorption rate and low interfacial adhesion between recycled aggregate with cement mortar was observed. A modification method of recycled aggregate based on the mineralization characteristics of urease-producing microbial was presented in the paper. The effects of calcium source and Ca2+ concentration on the physical and mechanical properties such as water absorption，mass variation，apparent density and crush value index of recycled aggregate were investigated. The test results show that the mineralization of urease-producing microbial could effectively increase the mass and apparent density of recycled aggregate，and reduce the water absorption and crush value index of recycled aggregates. Moreover，the mass of the recycled aggregates with modification increased 2% compared to the aggregates without modification. The water absorptions of recycled aggregates with modification and without modification were 2.92% and 5.41% respectively.
Key words：recycled aggregate，ureolytic bacteria，mineralization，calcium ion，modification