Relationship between fatigue behaviour and microstructure of concrete

Title: Relationship between fatigue behaviour and microstructure of concrete
Author(s): K. Zheng, W. Sun
Paper category : conference
Book title: International Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): W. Sun, K. van Breugel, C. Miao, G. Ye and H. Chen
Print-ISBN: 978-2-35158-065-3
e-ISBN: 978-2-35158-084-4
Publisher: RILEM Publications
Publication year: 2008
Pages: 677 - 684
Total Pages: 8
Nb references: 17
Language: English

Abstract: In this contribution, porosity of matrix and microhardness of the vicinity of aggregate were tested by means of mercury intrusion porosimetry and nano-inndentation respectively for concrete with different slag/fly ash content. Fatigue behavior of concrete was also exanimate under cyclic-flexural load. Relationship between microstructure features of matrix, the interface transition zone and fatigue behavior are estabilshed by adopting two indexes, i.e. matrix index M and the ITZ index I, which charactering effects of matrix and the interface transition zone on fatigue behavior respectively. Results show that the interface transition zone index I increase with the decrease in difference of microhardness between the interface transition zone and bulk matrix. The matrix index M decreases with the increase in bulk matrix porosity. The findings suggest a basic way to improve concrete fatigue behavior by improving the interface transition zone structure and/or strengthening bulk matrix.

Online publication: 2009-06-09
Publication type : full_text
Public price (Euros): 0.00