基于外加剂的水泥砂浆塑性收缩开裂本构关系的研究  

Research on Influence of Admixture to the Constitutive Equation of Plastic Shrinkage Cracking of Cement Mortar

作　　者：马一平[1] 谭畅[1] 杨晓杰[1] 王洋[1] 黎志[1] 

机构地区：[1]同济大学先进土木工程材料教育部重点实验室,上海201804

出　　处：《材料导报（纳米与新材料专辑）》2014年第2期342-348,共7页

基　　金：国家重点基础研究发展计划(973计划)(2009CB623104-5);中央高校基本科研业务费专项资金资助(0500219143);国家自然科学基金项目(51308406)

摘　　要：研究了水泥常用外加剂对砂浆塑性收缩性能的影响。实验表明，当引气剂掺量在0-200×10^-6时，引气剂掺量与抗裂指数成正比，当掺量达到250×10^-6以上时，砂浆开裂；早强剂不利于减少砂浆塑性收缩开裂；减水剂、保水剂可减缓砂浆塑性开裂；建立了引气剂、早强剂、减水剂、保水剂、缓凝剂掺量与砂浆塑性收缩参数及开裂时间的本构关系。The influence of admixture to plastic shrinkage cracking was studied. The results show that the content of air-entraining agent and anti cracking index are proportional when the content of air-entraining agent is lower than 200×10^-6. The cement mortar cracks when air-entraining agent content is up to 250×10^-6. Early strength accelerator counts against reducing the plastic shrinkage cracking of cement mortar, water-reducing agent, water-retaining agent and retarder can reduce the plastic shrinkage cracking of cement mortar. The constitutive relations between the content of air-entraining agent, content of early strength accelerator, content of water-reducing agent, content of water-retain agent, content of retarder and its anti-cracking index have been built.

关 键 词：外加剂 水泥砂浆 塑性收缩开裂 本构关系 

分 类 号：TU528[建筑科学—建筑技术科学]