self-healing ability of high-strength fibre-reinforced concrete with fly ash and crystalline admixture

the aim of this study is to analyse the self-healing capability of high-strength fibre-reinforced concrete (m70) with fly ash and crystalline admixture (ca) in four types of environmental exposures i.e. water immersion (wi), wet -dry cycles (wd), water contact (wc) and air exposure (ae). specimens for four mixes are cast, one mix containing 1.1% of ca and three mixes with 10%, 20% and 30% partial replacement of cement with fly ash and additions of 1.1% ca. the specimens were pre-cracked at 28 days, in the range of 0.10-0.40 mm and the time set for healing was 42 days. the result shows that all the mixes have considerable amount of closing ability and strength-regaining capability for all exposure conditions. the concrete with 20% fly ash and 1.1% ca has complete crack closing ability and 100% strength-regaining capability for wi and wd cycle conditions. from sem analysis, it is confirmed that self-healing products are caco3 and c-s-h gel.