个人信息Personal Information
教授
博士生导师
硕士生导师
性别:男
毕业院校:武汉理工大学
学位:博士
所在单位:土木工程系
学科:材料学. 结构工程
联系方式:mlchang@dlut.edu.cn
电子邮箱:mlchang@dlut.edu.cn
Influence of fine cement sand paste in preparation of cementitious materials
点击次数:
论文类型:期刊论文
发表时间:2020-01-10
发表刊物:CONSTRUCTION AND BUILDING MATERIALS
收录刊物:EI、SCIE
卷号:230
ISSN号:0950-0618
关键字:Interfacial transition zone; Fine cement; Sulfoaluminate cement; Image J; Hydration products; Mortar; Fine cement; MIP; SEM; TGA
摘要:The fine cement replacement in conventional cement plays an important role in the microstructure development. To date, no studies have been done to analyze the mixing of fine cement, sand, and water under partial replacement of conventional cement. Therefore, this paper explores the influence of fine cement sand paste on cementitious materials. In this study, the fine calcium sulfoaluminate cement (CSA) cement was prepared to have an average diameter of 2.4 mu m. Furthermore, its partial replacement at different percentages was investigated and compared to the ordinary Portland cement (OPC) system. For mortar preparation, a new method is proposed in this paper. First of all, the fine cement, sand, and water are mixed to form a paste and then conventional cement is added. Results emphasized that strength, porosity, permeability, and crack widths in the interfacial transition zone (ITZ) are more affected by this technique. It is concluded that partial replacement of 20% fine CSA content results in improved strength by 30%-35% as compared to the OPC system. Moreover, porosity and permeability were also reduced by 60%-70%. Also, the crack widths at the interfacial transition zone (ITZ) were also reduced up to 60%. This new technique for mortar preparation of fine cement can be applied to form a good microstructure network in cementitious composites. (C) 2019 Elsevier Ltd. All rights reserved.