Study on the properties of graphene oxide reinforced cement-based materials at high temperature

The addition of nanomaterials to cement-based materials effectively enhances their mechanical performance in high-temperature environments. Graphene oxide (GO), owing to its superior nanoscale properties, holds significant potential for improving the high-temperature resistance of cement-based materials. In this study, through uniaxial compression tests combined with acoustic emission technology and digital photography, the entire fracture process of graphene oxide cement-based materials degraded at different temperatures was comprehensively monitored. Microscopic characterization of the fracture surface was conducted using scanning electron microscopy. The experimental results indicate that the addition of 0.08 wt% graphene oxide can significantly enhance the mechanical performance of cement-based materials after high-temperature degradation, with a compressive strength increase ranging from 56.5% to 103.2%, especially at 800 degrees C. Simultaneously, it optimizes the fracture mode of cement-based materials after high-temperature degradation, effectively reducing micro-damage before the peak stage. The fracture mode transitions from small-scale multiple damages to largescale penetrating fractures. The microscopic characterization of the fracture surface exhibits a lower fractal dimension, with a reduction ranging from 2.06% to 3.61%. The use of graphene oxide significantly reduces micro-damage after high-temperature degradation, enhancing the integrity and load-bearing capacity of the materials post high-temperature degradation.