Chemical mapping of cement pastes by using confocal Raman spectroscopy

作     者：Fengjuan LIU Zhihui SUN 

作者机构：Department of Civil Construction and Environmental Engineering The University of Alabama Tuscaloosa AL 35487 United States Department of Civil and Environmental Engineering University of Louisville Louisville KY 40292 United States 

出 版 物：《Frontiers of Structural and Civil Engineering》 (结构与土木工程前沿（英文版）)

年 卷 期：2016年第10卷第2期

页      面：168-173页

核心收录：

学科分类：1305[艺术学-设计学（可授艺术学、工学学位）] 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] 0814[工学-土木工程] 

基　　金：Acknowledgements The financial supports from the National Science Foundation (CMMI-1265983)  the Department of Civil and Environmental Engineering  and the Graduate School Diversity Research Grant for Graduate Students (CODRE) at the University of Louisville  are highly appreciated. We also thank the Conn's Center for providing Raman spectroscopy. The authors also appreciate Dr. Chengqing Qi from CEMEX Technical Center for cement chemical composition analysis 

主　　题：chemical mapping Raman spectroscopy calcium silicates calcium hydroxide ettringite 

摘      要：In the present study, chemical mapping on the hydration process of cement paste with water-to-cement （w/c） ratio of 0.60 was implemented by Raman spectroscopy （RS）. The RS was applied to study the paste from 12 hours after mixing to 28 days. Cement ingredients and hydration products, including calcium silicates （C3S and C2S）, calcium hydroxide （CH）, and ettringite, were quantitatively studied. From the research, it is observed that calcium silicates were consumed gradually with the increased hydration age. Calcium hydroxide increased and tended to cluster in the pore vicinity during hydration. Ettringite was found to form on the surface of the unreacted particles, which was shown as a mixed zone of ettringite and calcium silicates in the maps. It is concluded from the study that chemical mapping was an effective method to assist in visualizing particle dispersion and connection on top of the quantitative analysis.