The microstructure of concrete cured at elevated temperatures
The microstructure of concrete cured at elevated temperatures
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DOI：
10.1016/0008-8846(95)00036-c
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发表时间：
1995-04
影响因子：
11.4
通讯作者：
H. H. Patel-H.;C. Bland;A. Poole
中科院分区：
文献类型：
--
作者：
H. H. Patel-H.;C. Bland;A. Poole
养护过程中的温度和相对湿度影响混凝土的强度发展、微观结构和长期耐久性。光学和电子显微镜技术已被用来评估在不同温度和湿度条件下养护的实验室制备的混凝土和案例材料的微观结构特征。对在16℃、42℃和46℃养护的两个月龄期混凝土的微观结构检查表明，水合物的空间分布、形态和体积以及其他微观结构特征没有明显差异。所有混凝土的基质中都有明显的微裂缝网络，在85℃养护的混凝土和使用18年的样品显示出较高的微裂缝程度。在46°C以上的温度下制备的混凝土还发现，在气孔和微裂缝中有大量水合物，特别是钙矾石，并具有普遍较粗糙的微观结构。
The temperature and relative humidity pertaining during curing influence the strength development, microstructure, and long term durability of concrete. Optical and electron microscopy techniques have been used to assess the microstructural characteristics of laboratory prepared concrete and case study material cured under a range of temperature and humidity regimes. Microstructural examination of two month old concrete cured at 16 °C, 42 °C and 46 °C has revealed no marked differences in the spatial distribution, morphology, and volume of hydrates and other microstructural features present. A network of microcracks was evident within the matrix of all the concretes, with that cured at 85 °C, and the sample with eighteen years in-service use, showing a higher degree of microcracking. The concretes prepared at temperatures above 46 °C were also found to have significant development of hydrates, particularly ettringite, within pores and microcracks, together with a generally coarser microstructure.