Mechanical Properties of Engineered Cementitious Composites with High Volume Fly Ash
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2009年第S1期
论文作者：祝瑜 杨英姿
文章页码：166 - 170
摘 要：In order to improve the mechanical properties and Greenness of engineered cementitious composites （ECC）,four-point bending test,compressive strength and flexural strength test were employed to analyze the effects of fly ash content on the mechanical properties of.ECC.The replacement ratio of cement with fly ash was 50%,60%,70% and 80%,respectively.The experimental results indicate that ECCs with high volume fly ash still remained the characteristic of pseudo-strain hardening and the mid-span deflection in four-point bending test increase remarkably by adding more fly ash.The observations of ECCs indicate that the multiple cracks are saturated and the crack width is relatively smaller for higher volume fly ash ECC,owing to the lower strength of matrix and the improvement ofinterface bonding.Fly ash reduces the compressive strength and flexural strength of ECC at all ages.Therefore,as the compressive strength could meet the requirement of practical engineering,employing the higher volume fly ash ECCs would benefit to obtain relatively high ductility.
祝瑜1，杨英姿2,3
1. School of Material Science and Engineering,Harbin Institute of Technology2. School of Civil Engineering,Harbin Institute of Technology3. China Building Materials Academy
摘 要：In order to improve the mechanical properties and Greenness of engineered cementitious composites （ECC）,four-point bending test,compressive strength and flexural strength test were employed to analyze the effects of fly ash content on the mechanical properties of.ECC.The replacement ratio of cement with fly ash was 50%,60%,70% and 80%,respectively.The experimental results indicate that ECCs with high volume fly ash still remained the characteristic of pseudo-strain hardening and the mid-span deflection in four-point bending test increase remarkably by adding more fly ash.The observations of ECCs indicate that the multiple cracks are saturated and the crack width is relatively smaller for higher volume fly ash ECC,owing to the lower strength of matrix and the improvement ofinterface bonding.Fly ash reduces the compressive strength and flexural strength of ECC at all ages.Therefore,as the compressive strength could meet the requirement of practical engineering,employing the higher volume fly ash ECCs would benefit to obtain relatively high ductility.
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