Abstract The tensile response of strain hardening UHPFRC under full restraint, subjected to curing temperatures of 20 °C, 10 °C, 5 °C, was investigated for two types of mixes with silica fume; Mix I with pure type I cement and Mix II with 50% replacement of cement with limestone filler, both having a similar steel fibrous mix. The development of the elastic modulus, tensile strength, autogenous shrinkage and eigenstresses were put into perspective with the hydration kinetics. Two phases of pozzolanic reaction with different rates of consumption of silica fume were identified. A systematic increase of the autogenous shrinkage and eigenstresses with the curing temperatures was observed. The eigenstresses development was much slower in the case of Mix II, owing to its larger relaxation potential. The eigenstresses in Mix I reached the strain hardening domain after one month, whereas the same in Mix II were only approaching the strain hardening domain after three months.

中文翻译：

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低固化温度对完全约束下低熟料应变硬化 UHPFRC 拉伸响应的影响

摘要 研究了两种类型的硅粉混合物在完全约束下应变硬化 UHPFRC 在 20 °C、10 °C、5 °C 固化温度下的拉伸响应；混合 I 与纯 I 型水泥和混合 II 用石灰石填料替代 50% 的水泥，两者都具有类似的钢纤维混合物。弹性模量、拉伸强度、自收缩和本征应力的发展与水合动力学有关。确定了具有不同硅粉消耗速率的火山灰反应的两个阶段。观察到自收缩和特征应力随固化温度的系统性增加。在 Mix II 的情况下，特征应力的发展要慢得多，因为它具有更大的松弛潜力。