RELATIONSHIP BETWEEN FATIGUE BEHAVIOR AND MICROSTRUCTURE
In this contribution, porosity of matrix and microhardness of the vicinity of aggregate weretested by means of mercury intrusion porosimetry and nano-inndentation respectively forconcrete with different slag/fly ash content. Fatigue behavior of concrete was also exanimateunder cyclic-flexural load. Relationship between microstructure features of matrix, theinterface transition zone and fatigue behavior are estabilshed by adopting two indexes, i.e.matrix index M and the ITZ index 1, which charactering effects of matrix and the interfacetransition zone on fatigue behavior respectively. Results show that the interface transitionzone index I increase with the decrease in difference of mierohardness between the interfacetransition zone and bulk matrix. The matrix index M decreases with the increase in bulkmatrix porosity. The findings suggest a basic way to improve concrete fatigue behavior byimproving the interface transition zone structure and/or strengthening bulk matrix.
Keren Zheng Wei Sun
School of Civil Engineering & Architecture,Central South University,China;Key Laboratory of Concrete College of Materials Science and Engineering,Southeast University,China
国际会议
南京
英文
677-684
2008-10-13（万方平台首次上网日期，不代表论文的发表时间）