限制条件下砂浆中MgO膨胀剂的膨胀特性  

Expansion Characteristics of MgO-based Expansive Agents in Restrained Mortar

作　　者：储玉婷 邓敏[1,2] 莫立武[1] 王光银[1] 

机构地区：[1]南京工业大学材料科学与工程学院,材料化学与工程国家重点实验室,南京210009 [2]先进土木工程材料协同创新中心,南京211189

出　　处：《硅酸盐通报》2014年第11期2767-2771,共5页Bulletin of the Chinese Ceramic Society

基　　金：国家科技支撑计划项目(2011BAE27B01);长江学者和创新团队发展计划(IRT1146)

摘　　要：本文研究了掺MgO膨胀剂(MEA)的限制砂浆试件在不同温度水养护条件下的限制膨胀率,对不同活性的MEA的膨胀特性进行了评价。结果表明,随着MEA掺量的增加,砂浆试件的限制膨胀率也随之增大;MEA活性越高,试件膨胀率增长越快;养护温度的升高缩短了膨胀稳定的时间,活性反应时间为68 s的MEA在20℃、30℃、40℃、60℃和80℃水养护条件下膨胀终止时间分别约为180 d、120 d、90 d、14 d和7 d,可见,养护温度的升高对MEA的水化加速作用明显;同时,养护温度的升高对掺MEA砂浆试件的最终膨胀率有一定影响。高温养护与低温养护条件下MEA的膨胀特性具有一定的关联性。Restrained expansion of mortars mixed with different activity MgO-based expansive agents（ MEA） cured in water at different temperatures were studied. The results showed that expansion of restrained mortars increased with the increasing of MEA amount. The higher the activity of MEA,the faster the expansion development of the mortars. With the increasing of curing temperature,the expansion of mortars stabled at earlier curing age. When the restrained mortars mixed with the MEA whose activity reaction time was 68 s cured in water at 20 ℃,30 ℃,40 ℃,60 ℃ and 80 ℃,the time trend to stable were about 180 d,120 d,90 d,14 d and 7 d,respectively. It indicated that higher curing temperature accelerate the hydration of MEA. Meanwhile,curing temperature had a certain influence on the final expansion. There was a correlation of MEA expansion characteristics between the high and normal curing temperatures.

关 键 词：MGO膨胀剂 限制膨胀率 养护温度 膨胀特性 

分 类 号：TU528[建筑科学—建筑技术科学]