Shrinkage of High Strength Engineered Cementitious Composite with Zeolite Particles as Internal Curing Agent

In this paper, shrinkage and internal relative humidity of internally cured ordinary Portland cement-based high strength engineered cementitious composite (OPC-HSECC) are experimentally investigated. Natural zeolite and calcined zeolite particles were used as internal curing agents. Calcination and substitution ratio of internal curing admixture that affects the shrinkage reduction efficiency of HSECC were inspected in the tests. Meanwhile, the effects on compressive strength of the composites are inspected. Test results show that development of shrinkage and internal relative humidity of OPC-HSECC exhibits two-stage progressing mode. As for shrinkage reduction efficiency, pre-wetted calcined zeolite particles is higher than that of natural zeolite in OPC-based cementitious composite and total shrinkage is reduced by more than 54% at 28 days, on the condition that the compressive strength is similar with the reference. According to the results, the optimized replacement ratio of calcined zeolite is around 30%.