Effect Of Graphene Oxide/Amphoteric Chitosan Intercalated Composite On Cement Hydration Crystalstructure And Mechanical Properties

At presently, the cement based materials are still the main buildingmaterials in the world and the development trend are high strength, long servicelife and green. To explore the focus on cement based materials at present is in theenhancement and toughening. The research explored the effects of grapheneoxide (GO) and graphene oxide/amphoteric chitosan intercalated composite(CTA-CMCTS/GO) on microstructure, tensile and folding strength of cementcomposites and foundation for by changing the microstructure of cementhydration products to improve the toughness and resistance to crack capabilities.The GO nano-dispersion was synthesized by ultrasonic dispersion withgraphite oxide which prepared by improving the Hummers. Then theCTA-CMCTS/GO was synthesized by the graphene oxide (GO) nano-dispersionand amphoteric chitosan (CTA-CMCTS). The research explored the effects ofGO and CTA-CMCTS/GO on crystal structure of cement hydration products andmechanical properties of hardened cement paste. SEM results show that GO andCTA-CMCTS/GO plays an important role in the generation and growth ofcement hydration products. XRD results show that GO and CTA-CMCTS/GOhave a remarkable effect on the generation and growth of the hydration productscrystals such as ettringite (AFt) and portlandite (CH) and conducive to enhancethe compressive strength and flexural strength. The maximum compressivestrength were79.5MPa and83MPa and the maximum flexural strength were7.7MPa and9.6MPa of cement paste when the dosage of GO andCTA-CMCTS/GO were0.02%and0.05%. This shows that the GO andCTA-CMCTS/GO can regulate formation of flower-like hydration crystals andincrease remarkably the tensile and folding strength of the corresponding cement composites. The results suggested that CTA-CMCTS/GO has template role informing cement hydration crystals, which can regulate the microstructure ofcement hydration products and improve toughness of cement composites. Apossible mechanism of CTA-CMCTS/GO mediated formation of flower-likecrystals was also presented in this paper. The research result provides a newpathway to significantly improving the toughness of hardened cement paste andhas significant practical applications.