The relative high cost remains an obstacle for wider commercial use of Engineered Cement-based Composites (ECC). By making extensive use of locally available, waste materials as ingredients, this may be overcome. In this paper, the use of large quantities of fly-ash (FA) and ground granulated blast furnace slagment (slag) is reported. Their influence on ECC mechanical response in direct tensile tests is quantified and the reasons for the different behaviours studied via scanning electron microscope (SEM) photos. This study is performed on ECC specimens containing varying amounts of slag and/or fly-ash to assist in rational ECC mix design strategies. Particular focus is on the beneficial effect of fly-ash on the fresh mixability and eventual toughness of ECC. To compensate for the slow early-age strength development, fine grounded slagment is blended into the mix.
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