Effect of Pre-wetting Lightweight Aggregates on the Mechanical Performances and Microstructure of Cement Pastes

作     者：丁庆军 向玮衡 ZHANG Gaozhan HU Cheng DING Qingjun;XIANG Weiheng;ZHANG Gaozhan;HU Cheng

作者机构：State Key Laboratory of Silicate Materials for ArchitecturesWuhan University of TechnologyWuhan 430070China School of Material Science and Chemical EngineeringAnhui Jianzhu UniversityHefei 230601China The State Key Laboratory of Refractories and MetallurgyWuhan University of Science and TechnologyWuhan 430081China 

出 版 物：《Journal of Wuhan University of Technology(Materials Science)》 (武汉理工大学学报（材料科学英文版）)

年 卷 期：2020年第35卷第1期

页      面：140-146页

核心收录：

学科分类：08[工学] 081304[工学-建筑技术科学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0813[工学-建筑学] 

基　　金：Funded by National Natural Science Foundation of China(Nos.51878003 and 51778513) Major Special Science and Technology Project of Hubei Province(No.2018AAA001) the National Basic Research Program of China(973 Program)(No.2015CB655101) 

主　　题：pre-wetting lightweight aggregates cement pastes interfacial zone compressive strength microstructure 

摘      要：The water absorption and desorption processes of different types of lightweight aggregates were ***,the influences of pre-wetting lightweight aggregates on compressive strength,microhardness,phase composition,hydration parameters and micromorphology of the cement pastes were *** results showed that the water absorption and desorption capacities of the lightweight aggregates increased with the decrease of the densification *** the addition of pre-wetting lightweight aggregates,the compressive strength of the cement pastes would ***,the enhancement effect was more obviously with the desorption capacity of pre-wetting lightweight aggregates ***,sample S1 with pre-wetting red-mud ceramisites had the highest compressive strength,of which increased to 49.4 MPa after 28 d curing *** reason is that mainly because the addition of pre-wetting lightweight aggregates can promote the generation of C–S–H gels in the interfacial zone,and the hydration degree of the interfacial zone increases with the water desorption of pre-wetting lightweight aggregates *** is contributed to optimize the microstructure to enhance microhardness of the interfacial zone,resulting in the compressive strength of the cement-based materials ***,the pre-wetting lightweight aggregates with high porosity and strength are the potential internal curing agents for high-strength lightweight concretes.