Compressive properties of epoxy resin-concrete at early-age

Epoxy resin-concrete is a new type of polymer concrete prepared by mixing epoxy resin, curing agent and aggregate. Fast growth of early strength is one of its excellent properties. In this paper, the uniaxial compression tests of epoxy resin-concrete at different ages were carried out to study the early compressive performance of epoxy resin-concrete. Test results show that the compressive strength of epoxy resin-concrete increases rapidly during the first 24 h curing age, and the compressive strength after curing 24 h can achieve 50.3 MPa. Considering the strength growth mechanism of epoxy resin-concrete and the stability of compressive strength after curing 72 h, a prediction model of early compressive strength of epoxy resin-concrete based on a nth order curing model for epoxy resin was established. The model has better prediction results compared with the classic CEB-FIP and ACI 209 models forconventional cement concrete. Based on the prediction model and experimental results of compressive strength, a uniaxial compression constitutive model of epoxy resin-concrete was established. This model can predict the compressive stress-strain relationship of epoxy resin-concrete at early-age.