The paper deals with the modification of concrete and epoxy resin with a 2D carbon material (2DCM) obtained by liquid-phase shear exfoliation of graphite. It was experimentally established that the three-point bending strength of graphene-modified samples (0.05 wt.% of graphene in cement) in 1.5 times greater than that of pristine (unmodified) concrete. The water absorption of concrete modified with the 2DCM was found to decrease by 3 times. A method, differing from the known ones where few-layered graphene is obtained directly in the hardener through shear exfoliation of graphite, was developed for modifying the ED-20 epoxy resin using the 2DCM. It allowed us to increase the Charpy impact strength by 25-30 %. The tensile and bending strength were increased by 10 %. The test results of the restored beams after breaking at three-point bending, as well as on the adhesion of the reinforcing fabric to concrete, revealed a synergistic effect while using the concrete and epoxy resin modified with the 2DCM.
展开▼
