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[1] Guo Liping, Andrea Carpinteri, Sun Wei, et al. Measurement and analysis of defects in high-performance concretewith three-dimensional micro-computer tomography [J]. Journal of Southeast University (English Edition), 2009, 25 (1): 83-88. [doi:10.3969/j.issn.1003-7985.2009.01.018]
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Measurement and analysis of defects in high-performance concretewith three-dimensional micro-computer tomography()
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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:
25
Issue:
2009 1
Page:
83-88
Research Field:
Materials Sciences and Engineering
Publishing date:
2009-03-30

Info

Title:
Measurement and analysis of defects in high-performance concretewith three-dimensional micro-computer tomography
Author(s):
Guo Liping1;  2;  Andrea Carpinteri3;  Sun Wei1;  2;  Qin Wenchao4
1School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
2Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 211189, China
3Department of Civil Engineering, University of Parma, Parma 43100, Italy
4YXLON International X-Ray GmbH Shanghai Rep.Office, Shanghai 200041, China
Keywords:
high-performance concrete;  defect;  microstructure;  X-ray micro-focus computer tomography;  mineral admixtures
PACS:
TU522.07
DOI:
10.3969/j.issn.1003-7985.2009.01.018
Abstract:
In order to investigate the effects of two mineral admixtures(i.e., fly ash and ground slag)on initial defects existing in concrete microstructures, a high-resolution X-ray micro-CT(micro-focus computer tomography)is employed to quantitatively analyze the initial defects in four series of high-performance concrete(HPC)specimens with additions of different mineral admixtures.The high-resolution 3D images of microstructures and filtered defects are reconstructed by micro-CT software.The size distribution and volume fractions of initial defects are analyzed based on 3D and 2D micro-CT images.The analysis results are verified by experimental results of water-suction tests.The results show that the additions of mineral admixtures in concrete as cementitious materials greatly change the geometrical properties of the microstructures and the spatial features of defects by physical-chemistry actions of these mineral admixtures.This is the major cause of the differences between the mechanical behaviors of HPC with and without mineral admixtures when the water-to-binder ratio and the size distribution of aggregates are constant.

References:

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Memo

Memo:
Biographies: Guo Liping(1979—), female, doctor, lecturer, guoliping@seu.edu.cn;Sun Wei(1935—), female, doctor, professor, academician of China Engineering Academy, sunwei@seu.edu.cn.
Foundation items: The Scholarship Supported by Ministry of Education of China for Research Abroad(No.3037 [2006]), the Excellent Doctoral Dissertation Foundation of Southeast University(No.YBTJ-0512), the National Basic Research Program of China(973 Program)(No.2009CB623203).
Citation: Guo Liping, Andrea Carpinteri, Sun Wei, et al.Measurement and analysis of defects in high-performance concrete with three-dimensional micro-computer tomography[J].Journal of Southeast University(English Edition), 2009, 25(1):83-88.
Last Update: 2009-03-20