净浆和砂浆外方内圆偏心约束收缩试验方法研究  

Study on the External Square Restrained Eccentric Ring Shrinkage Test Method in Paste and Mortar

作　　者：李浩然[1] 朱涵[1,2] 胡芯国[1] 朱学超[1] 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]天津大学滨海土木工程结构与安全教育部重点实验室,天津300072

出　　处：《硅酸盐通报》2015年第6期1491-1497,共7页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51078261)

摘　　要：由于圆环法试件具高度的几何对称性,使得试件收缩裂缝位置随机出现,不便于裂缝的观察,针对于这一问题提出了净浆和砂浆外方内圆偏心约束试验方法。通过数值分析阐述了外方内圆偏心约束试验方法的原理、确定模具最佳偏心距,并通过试验统计了试件的裂缝位置以及试件的开裂时间。数值分析表明:当偏心距t=20 mm时最佳;试验表明:外方内圆偏心约束试验方法不但能够限定净浆和砂浆试件的裂缝位置,还可以缩短净浆和砂浆收缩试验的试验周期,提高试验的开裂敏感度。In conventional restrained ring test method （RRTM）, specimens are of high symmetric configuration in geometry, which leads to random cracking locations and inconvenience in observation. To solve the problems, a innovative test method, named the restrained squared eccentric ring test method （RSERTM） is presented in the paper. Numerical analysis is introduced to acquire the optimal oft^et distance of mold and predict the cracking locations in the method. Tests are conducted to identify the cracking locations. Numerical analysis offset distance that t = 20 mm is an optimal dimension for the tests mould. Further experiments verify that the method confine the cracking locations of paste and mortar to predictable places and accelerate the cracking compared with conventional method.

关 键 词：外方内圆偏心试验方法 裂缝位置 最佳尺寸 开裂时间 

分 类 号：TU525[建筑科学—建筑技术科学]