Strain hardening cementitious composite(SHCC)has strain-hardening and multiple micro-cracking characteristics with an ultimate tensile strain exceeding 3% under uniaxial tensile load.Research on crack development of reinforced concrete beams repaired with SHCC was done through four-point bending sustained load test of five repaired beams and a contrast beam.The influence of interface roughness,thickness of repair layer and age of SHCC on crack was mainly investigated.The occurrence,development and distribut...