Abstract
This study aims to carry out a high-temperature exposure assessment for graphene oxide (GO) reinforced cement in terms of weight loss, flexural strength, and compressive strength. Different additive amounts of GO in cement are experimentally studied to unfold its effect on enhancing the mechanical performance of prepared GO reinforced cement. Temperatures are chosen as room temperature, 200, 400, 600, and 800°C, corresponding to different reaction status of cement. It is found that as the temperature increases, the water evaporates from the GO reinforced cement. Evaporated quantity of water relies on the reaction status, and the relation between weight loss and temperature is provided. Benefiting from the bonding effects of GO, hydrated calcium silicate hydrate (C–S–H) is chemically produced and, thus, a reticular bridging system, which is greatly helpful to enhance the flexural strength, is formed. Unlike flexural strength, adding GO into cement statistically has little effect on the compressive strength, except when the temperature rises up to 800°C due to the occurrence of decarburization from dehydration.
Highlights
The residual flexural strength generally decreases. This is because the cement-based material has undergone a process from dehydration to decarburization during the heating process
The flexural and compressive strength of GO reinforced cement (GORC) with different additive amounts are experimentally investigated under different temperatures
The maximum weight loss occurs at the second temperature-rise period, during which more than half of the total weight loss is found with low fluctuation, implying that graphene oxide (GO) has a slight effect on water retention as the temperature increases
Summary
Reinforced cements are under rapid development regarding high strength, toughness, durability, crack resistance, and multifunction by adopting dual or multiple organic and inorganic composite materials, metal and non-metal materials, and fibrous and granular materials (Li et al, 2020). To improve the durability and ductility of cement composites, graphene oxide (GO) could be added (Lu Z et al, 2020; Zhao et al, 2020). GO can increase the flexural and compressive strength of cement-based materials (Peng et al, 2019; Indukuri et al, 2020). Fire incidents will result in the exposure of the building structure to high temperature, and the internal structure of concrete will be changed and its compressive and flexural strength will be greatly reduced (Nadeem et al, 2014). High-temperature–resistant cement-based composites are promising aspects for practical application in improving the fire resistance of building structures.
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