Hydration evolution and compressive strength of calcium sulphoaluminate cement constantly cured over the temperature range of 0 to 80 °C
Hydration evolution and compressive strength of calcium sulphoaluminate cement constantly cured over the temperature range of 0 to 80 °C
复制标题
0~80℃持续养护硫铝酸钙水泥的水化演化及抗压强度
DOI：
10.1016/j.cemconres.2017.05.025
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发表时间：
2017-10-01
影响因子：
11.4
通讯作者：
Xu, Linglin
中科院分区：
文献类型：
--
作者：
Wang, Peiming;Li, Nan;Xu, Linglin
养护温度对水泥浆体的性能和水化性能起着至关重要的作用。研究了养护温度（0 ~ 80℃）对硫铝酸钙（CSA）水泥水化演化和抗压强度的影响。采用XRD、DSC-TGA和BSE-IA对其进行了分析。实验结果表明，不同的养护温度不会改变水化产物的种类，但会影响水化产物的数量。AFm和AFm的最大值分别出现在20℃和40℃。高温会促进水合作用。1 d水化度从0℃时的20.3%增加到80℃时的53.0%，但在低温（< 20℃）下，由于持续的大量水化，有利于形成更致密、更均匀的基质。早期抗压强度随温度升高而升高。但在40℃和80℃时，抗压强度从7天开始下降。这与水化演化有一定的关系。在达到临界水化程度（本研究约为53%）之前，抗压强度受水化程度控制。之后，以AFt/AFm比和微观结构为主。
Curing temperature plays a critical role in the properties and hydration of cement pastes. The influence of curing temperature (0-80 degrees C) on the hydration evolution and compressive strength of calcium sulphoaluminate (CSA) cement has been studied in this paper. It was investigated by a combination of XRD, DSC-TGA and BSE-IA. The experimental results indicate that various curing temperatures do not change the type of hydration products but do affect their amounts. The maximum amounts of AFt and AFm appear at 20 degrees C and 40 degrees C respectively. Elevated temperatures promote the hydration. The 1 d-hydration degree increases from 20.3% at 0 degrees C to 53.0% at 80 degrees C. However, low temperature (< 20 degrees C) is in favor of a denser and more homogeneous matrix due to continuous substantial hydration. The early-age compressive strength increases at elevated temperatures. But at 40 degrees C and 80 degrees C, the compressive strength decreases since 7 days. It has some connections with the hydration evolution. Before reaching a critical degree of hydration (about 53% in this study), the compressive strength is controlled by hydration degree. After that, it is dominated by AFt/AFm ratio and microstructure.