采用约束圆环试验研究了早龄期水泥砂浆的应力变化规律与开裂趋势。应用早龄期砂浆水化热模型、收缩与徐变等预测分析模型，建立了考虑温度、干缩与自收缩、徐变及硬化等多种效应综合作用下的约束水泥砂浆环早龄期时变应力分析模型，讨论了约束钢环与砂浆环的相对约束刚度对钢环约束效应的影响，提出了圆环开裂预测因子以分析约束水泥砂浆环的开裂趋势，与实际观察结果和数值分析结果的对比表明，上述理论分析与预测模型是合理并适用的。

The restraint ring test is used to assess the restraint stresses development and cracking potential for early-age cement based construction materials. An analytical expression is presented to estimate the time-dependent residual stresses of the restraint mortar ring considering the synthetic effects of hydration heat, autogenous shrinkage, drying shrinkage, creeping and restraint by the steel ring. The relative stiffness of the steel ring to the mortar ring is discussed. The tendency and age of cracking of the restrain mortar ring is predicted by introducing the cracking tendency factor. The present analytical method demonstrates significant agreement with the restraint ring test and numerical simulation by FEM.

国家自然科学基金(11272362); 教育部科学技术研究重大项目(315039); 中央高校基本科研业务费资助(CDJZR12245501)