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- 混凝土与制品
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膨胀剂对某地下室侧墙C50混凝土抗裂性能的影响
作者：倪玉祥1，2，陆安群1，2，王建军3
（1.高性能土木工程材料国家重点实验室，江苏省建筑科学研究院有限公司，江苏 南京 210008；
2.江苏苏博特新材料股份有限公司，江苏 南京 211103；3.广西交通投资集团有限公司，广西 南宁 530022）
摘要：研究了氧化钙-硫铝酸钙类膨胀剂对地下室侧墙C50混凝土抗裂性能的影响。结果表明：随着膨胀剂掺量增加，C50混凝土的限制膨胀率和自生体积变形增大；内掺8%膨胀剂的C50混凝土的限制膨胀率符合JGJ/T 178—2009《补偿收缩混凝土应用技术规程》规定的抗裂性要求；约束条件下，膨胀剂内掺0～12%范围内，随着膨胀剂掺量增加，C50混凝土的抗渗性能提高；在50 cm厚地下室侧墙C50混凝土温度历程下，掺8%膨胀剂可有效补偿侧墙混凝土的温度收缩和早期自收缩，降低了地下室侧墙C50混凝土的开裂风险。
关键词：膨胀剂；地下室侧墙；C50混凝土；抗渗；变形
中图分类号：TU528.042+.4 文献标识码：A 文章编号：1001-702X（2018）12-0001-04
Effects of expansive agent on anti-crack performance of sidewall C50 concrete in a basement
NI Yuxiang1，2，LU Anqun1，2，WANG Jianjun3
（1.State Key Laboratory of High Performance Civil Engineering Materials，Jiangsu Research Institute of Building Science，Nanjing 210008，China；
2.Jiangsu Sobute New Materials Co. Ltd.，Nanjing 211103，China；
3.Guangxi Communications Investment Group Co. Ltd.，Nanning 530022，China）
Abstract：In this paper，effects of calcium oxide and calcium sulphoaluminate expansive agent on anti-crack performance of sidewall concrete in a basement were investigated. The results indicated that restrained expansion rate and autogenous volume deformation of C50 concrete increased with increase of expansive agent. The restrained expansion rate of C50 concrete with 8% expansive agent meets requirements in JGJ/T 178—2009 "Technical Specification for Application of Compensating Shrinkage Concrete". Impermeability of C50 concrete with 0～12% expansive agent would be improved under constraint condition with the increase of the expansive agent. Shrinkage induced by temperature drop and early autogenous shrinkage of side wall concrete with 8% expansive agent could be compensated under temperature history of C50 concrete for 50 cm sidewall in a basement，which lead to lower cracking risk.
Key words：expansive agent，sidewall in a basement，C50 concrete，impermeability，deformation