Shrinkage distortion of fiber-reinforced high-ductility cementitious composites

The effects of sand-to-cementitious materials ratio (S/C), water-to-cementitious materials ratio (W/C), fiber species and using a reduction additive on the shrinkage distortion of fiber-reinforced high-ductility cementitious composites (ECC) were investigated. Experimental results show that the shrinkage strain of ECC reduces with increasing S/C and enlarges with increasing W/C. Chinese PVA fibers effectively control the early stage shrinkage distortion of ECC, but Japanese PVA fibers of high Young's modulus have great effect on the final stage shrinkage distortion of ECC. Hybrid fibers can better control the shrinkage distortion of ECC than Chinese or Japanese PVA fibers separately when the W/C is 0.40. The shrinkage strain probably reduces 200×10^-6 by using a reduction additive, and the reduction additive can also effectively control the shrinkage distortion of ECC at the W/C of 0.40.