A Fariborz Nateghi - Professor, Department of Structural Engineering, International Institute of Earthquake Engineering and Seismology, Tehran, Iran
M.H Ahmadi - PhD, Department of Structural Engineering, International Institute of Earthquake Engineering and Seismology, Tehran, Iran

Cement-based composite materials like Engineered Cementitious Composites (ECCs) are applicable in the strengthening of structures because of the high tensile strength and strain. Proper mix proportion, which has the best mechanical properties, is so essential in ECC design material to use in structural components. In this paper, after finding the best mix proportion based on uniaxial tensile strength and strain, the correlation between these parameters were calculated. Since material properties depend on the content ratios, six mixtures with different Fly Ash (FA) content were considered to find the best ECC mixture called Improved ECC (IECC). Also, the influence of local fine aggregates and FA on the tensile behavior of ECC was considered to introduce IECC which has the best tensile properties. The results show that the effects of FA and fine aggregates on tensile behavior are considerable.

Engineered Cementitious Composites, Experimental Study, Local Admixtures, Mechanical Properties