Characterization of microstructure evolution of cement paste by micro computed tomography
来源期刊：中南大学学报(英文版)2013年第4期
论文作者：He Yong-jia(何永佳) Jason Mote David A. Lange
文章页码：1115 - 1121
Key words：Micro computed tomography (Micro-CT); 3D image; microstructure; cement paste
Abstract: 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.
He Yong-jia(何永佳)1,2, Jason Mote3, David A. Lange3
(1. State Key Laboratory of Silicate Materials for Architectures (Wuhan University of Technology),
Wuhan 430070, China;
2. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;
3. Department of Civil and Environmental Engineering,
University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA)
Abstract: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.
Key words:Micro computed tomography (Micro-CT); 3D image; microstructure; cement paste
