Characterization of microstructure evolution of cement paste by micro computed tomography  

作　　者：何永佳 Jason Mote David A. Lange 

机构地区：[1]State Key Laboratory of Silicate Materials for Architectures (Wuhan University of Technology) [2]School of Materials Science and Engineering, Wuhan University of Technology [3]Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign

出　　处：《Journal of Central South University》2013年第4期1115-1121,共7页中南大学学报（英文版）

基　　金：Project(2009CB623201) supported by the National Basic Research Program of China;Projects(50902106, 51272193) supported by the National Natural Science Foundation of China;Project(NCET-10-0660) supported by New Century Excellent Talents in Universities of China

摘　　要：Micro computed tomography (Micro-CT) was applied to obtain three-dimensional images of the microstructure of cement paste (water-to-cement mass ratio of 0.5) at different ages. By using the Amira software, component phases of the cement paste such as pores, hydration products, and unhydrated clinker particles were segmented from each other based on their 3D image grey levels; their relative contents were also calculated with the software, and the data are 61.2%, 0% and 38.8% at the beginning of hydration and 11.8%, 78.5% and 9.7% at 28 d age, respectively. The hydration degree of cement paste at different ages was compared with the experimental data acquired by loss on ignition (LOI) tests. The results show that the calculated and measured data reasonably agree with each other, which indicates that micro-CT is a useful and reliable approach to characterize the micro structure evolution of hydrating cement paste.Micro computed tomography （Micro-CT） was applied to obtain three-dimensional images of the microstructure of cement paste （water-to-cement mass ratio of 0.5） at different ages. By using the Amira software, component phases of the cement paste such as pores, hydration products, and unhydrated clinker particles were segmented from each other based on their 3D image grey levels; their relative contents were also calculated with the software, and the data are 61.2%, 0% and 38.8% at the beginning of hydration and 11.8%, 78.5% and 9.7% at 28 d age, respectively. The hydration degree of cement paste at different ages was compared with the experimental data acquired by loss on ignition （LOI） tests. The results show that the calculated and measured data reasonably agree with each other, which indicates that micro-CT is a useful and reliable approach to characterize the micro structure evolution of hydrating cement paste.

关 键 词：Micro computed tomography （Micro-CT） 3D image MICROSTRUCTURE cement paste 

分 类 号：TU528[建筑科学—建筑技术科学]