Introduction

In recent years,autogenous selfhealing has shown great promise in the improvement of concrete durability[1-4].However,a limited number of reports were published on its performance when subjected to repeated loading.Sahmaran et al.[5,6]repeatedly preloaded engineered cementitious concrete(ECC)with FA or slag to 70% of their splitting tensile deformation capacities.Sneock et al.[7]preloaded the strain-hardening cementitious composites twice to 1% of their maximum strain.The pre-damage level of both studies was restricted.Also,the tested specimens were limited on advanced concrete instead of the common mortar.In this paper,influences of various degrees of predamage on self-healing behavior of mortars were investigated based on mechanical tests.