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。
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 Applieation 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.
作者
倪玉祥
陆安群
王建军
NI Yuxiang;LU A nqun;WANG Jianjun(State Key Laboratory of High Performance Civil Engineering Materials,Jiangsu Research Institute of Building Science,Nanjing 210008,China;Jiangsu Sobute New Materials Co.Ltd.,Nanjing 211103,China;Guangxi Communications Investment Group Co.Ltd.,Nanning 530022,China)
出处
《新型建筑材料》
北大核心
2018年第12期1-4,共4页
New Building Materials
基金
广西科技计划项目(桂科AC16380109).
关键词
膨胀剂
地下室侧墙
C50混凝土
抗渗
变形
expansive agent
sidewall in a basement
C50 concrete
impermeability
deformation
