硅酸盐通报2025，Vol.44Issue(2)：613-622,10.DOI:10.16552/j.cnki.issn1001-1625.2024.0977
核壳结构磷石膏基骨料/硅酸盐水泥界面特性及其调控
Interface Characteristics and Regulation of Core-Shell Structure Phosphogypsum-Based Aggregate/Portland Cement
何静 1吕伟 2吴赤球 2余正康 1李义胜 1水中和3
作者信息
- 1. 武汉理工大学材料科学与工程学院,武汉 430070
- 2. 湖北昌耀新材料股份有限公司,宜昌 443000
- 3. 武汉理工大学材料科学与工程学院,武汉 430070||武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070
- 折叠
摘要
Abstract
In order to solve the compatibility problem between phosphogypsum-based aggregate and ordinary Portland cement,a core-shell structure phosphogypsum-based aggregate was prepared in this paper.Based on the systematic study of the influence of the composition of aggregate shell on the macroscopic properties such as aggregate water absorption,cylinder compressive strength and compressive strength,the influence of the composition of aggregate shell on the microstructure characteristics of the interfacial transition zone of concrete was studied by means of modern analysis and testing methods.The results show that the performance of the core-shell structure phosphogypsum-based aggregate is improved compared with the uncoated aggregate,and the compressive strength of the concrete test block made of this aggregate and ordinary Portland cement is improved.The interface formed by phosphogypsum-based aggregate and cement with core-shell structure is compared with that without shell.In the early stage of hydration,the content of Ca(OH)2 at the interface is reduced,the pore structure at the interface is optimized,the microhardness at the interface is improved,the width of the interfacial transition zone is reduced,and the shell layer can reduce the probability of S element in the aggregate core diffusing to the interface.In the later stage of hydration,the hydration reaction at the interface is basically stable,and the shell layer can still slow down the trend of S element diffusion from the core to the interface,reduce the risk of expansion and cracking at the interface,and increase the feasibility of the application of phosphogypsum-based aggregate in ordinary Portland cement system.关键词
磷石膏基骨料/核壳结构/界面过渡区/反应机理/孔隙率Key words
phosphogypsum-based aggregate/core-shell structure/interfacial transition zone/reaction mechanism/porosity分类
建筑与水利引用本文复制引用
何静,吕伟,吴赤球,余正康,李义胜,水中和..核壳结构磷石膏基骨料/硅酸盐水泥界面特性及其调控[J].硅酸盐通报,2025,44(2):613-622,10.
