Paper Title
The Effects of Healed Crack Length on the Healing Efficiency of Self-Healing Concrete

Abstract
The effects of healed-crack length on healing efficiency of self-healing concrete are investigated computationally. The proposed models based on the combination of eXtended Finite Element Method (XFEM) and FEM elements. XFEM used with the cohesive zone to predict crack propagation. The models represented a uniaxial tensile test. Special attention is given to effects of healed-crack length on fracture strength, on the load carrying capacity and fracture probability of the solidified healed crack. The effect of healed-crack length on healing efficiency is found to be significant factor on the load carrying capacity and crack propagation. It is shown clearly that there is a trend of increasing carrying load capacity of self-healing concrete with increasing of the healed- crack length. In addition, with the a minimum healed-crack length of healed sample still there is a good healing efficiency as it has load carrying capacity almost more than twice the load carrying capacity of the virgin sample. Keywords - Healing Efficiency, Healed-crack Length, Self-healing Concrete, XFEM.