▎ 摘　　要

The influence of high temperature (1000 degrees C) on the microstructure and phase transformation of graphene-cement composites was investigated experimentally. The results exhibited that Graphene brought a significant influence not only on the phase transformation of hydration products, but also on the microstructure of cemented crystals. The phase transformation of hydration products was studied through X-ray diffraction (XRD) and Fourier Transform Infrared Spectrum (FTIR) under different temperature, from which we captured the phase transformation temperature of ettringite, portlandite and calcium carbonate in graphene-cement composites. The influence of graphene on the morphology of cement at various temperatures was observed through scanning electron microscopic (SEM), showing that crystal particles crystalized around graphene had regular shape and ordered arrangement at certain temperature. The morphology of hydration products could also regularly crystalize with the increase of heating temperature. The initiation and propagation of cracks in cement matrix were also investigated at high temperature.