High-temperature properties of cement paste with graphene oxide agglomerates

Abstract

This study investigated the high-temperature properties of cement pastes with graphene oxide (GO) agglomerates at temperatures of 105 °C, 200 °C, 300 °C, and 450 °C. Generally, at ambient temperatures, incorporating GO can refine the pore structures and crystal sizes of calcium hydroxide, which is beneficial for the thermal resistance of a cement paste. In this study, during heat treatment, it was found that the water bound in GO agglomerates is negligible (from conducting a weight loss analysis). The GO agglomerates suppress the pore structure coarsening of cement pastes. The pore structure is finer and the total porosity is reduced by 8.5% with incorporation of 0.04% (by weight) GO at 300 °C which is close to critical point of water. With incorporation of 0.04% by weight GO in cement pastes at 200 °C, 300 °C, and 450 °C, the residual compressive strengths are 9.28%, 12.63%, and 10.83% higher than that of a reference sample, respectively.