文献类型：期刊文献

英文题名：Evolution of mechanical properties and permeability of concrete during steam curing process

作者：Shi, Jinyan[1];Liu, Baoju[1];Wu, Xiang[1];Qin, Jiali[1];Jiang, Junyi[1];He, Zhihai[2]

机构：[1]Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China;[2]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China

年份：2020

卷号：32

外文期刊名：JOURNAL OF BUILDING ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:000588052000235)、、EI(收录号：20204009292972)、Scopus(收录号：2-s2.0-85091773148)、WOS

基金：This research work is financially supported by the National Key R&D Program of China (2017YFB1201204) and National Natural Science Foundation of China (U1534207).

语种：英文

外文关键词：Steam curing process; Mechanical properties; Gas permeability; Performance evolution; Steam-cured concrete

外文摘要：Steam curing involves a complex moisture-thermal coupling process, which greatly affects the performance evolution of cement-based materials. The effects of mineral admixtures and curing ages on the hydration process, mechanical properties and permeability of concrete during the steam curing process had been studied, and the pore structure, micromorphology and interfacial transition zone (ITZ) were also determined by multi-scale image processing and scanning electron microscopy. The results show that the concrete performances are significant changed during the steam curing process, which can be divided into three stages. In the early stage, hydration products are less, the porosity is larger, and the ITZ is weaker. With the increase of the curing temperature and age, the hydration products are continuously deposited, the microstructure is denser, the mechanical properties are enhanced, and the permeability is decreased significantly. As a result, an empirical model is developed to describe the relationship between effective pore structure (multi-scale pores structure and ITZ) and gas permeability.