Experiment and Study on Direct Shear Behavior for Adhesion of Fiber Reinforced High Ductility Cementitious Composites on Existing Concrete

Fiber reinforced high ductility cementitious composites(ECC) has high ductility and could effectively control micro-crack width.The experiment of direct shear behavior is researched for adhesion of ECC on existing concrete and provides records for retrofitting or strengthening concrete.Experimental results show that compressive and flexural strength of ECC are improved with increase of age;Interface shear strength of ECC bonding specimens is improved with increase of S/C,indicating the behavior of adhesion of ECC on existing concrete is improved with increase of S/C;The behavior of adhesion of ECC on existing concrete is much better than on self-compacting concrete and plain concrete.ECC is perfect material for retrofitting deck and pavement,strengthening reservoir and dam.