Flexural behavior and crack-damage mitigation of plain concrete beam with a strain-hardening cement composite (SHCC) layer at tensile region

摘要: Abstract The paper deals with the flexural and cracking behavior experimentally observed in plain concrete beam a hybrid polyvinyl alcohol (PVA) polyethylene (PE) fiber reinforced strain-hardening cement composite (SHCC) layer before after repeated freeze–thaw exposure. influences of SHCC thickness, type, freezing–thawing cycles on overall performance SHCC-layered beams are investigated. Concrete beams, which had 100 × 100 mm rectangular cross section 300 mm span length, were tested four-point bending. Two kinds SHCCs used as materials for tension zone beam. Beam specimens two different thicknesses (30 mm 50 mm) prepared. Freezing thawing tests followed ASTM C 666 Procedure B continued until specimen achieved 300 cycles. Experimental study shows that when subject to monotonic loading, repair system showed 2.5–3.5 times increased load carrying capacity, mitigated damage compared enhancement strength ductility is found increase SHCC’s tensile strain capacity thickness. While freezing exposure decreased deflection at ultimate beam, 300 cycles up average 15% virgin