EFFECT OF GRAPHENE NANO SHEETS REINFORCEMENT ON THE PHYSICAL PROPERTIES OF CEMENT PASTE
DOI:
https://doi.org/10.22213/2410-9304-2018-3-160-168Keywords:
Graphene nanosheets, Cement paste, Mechanical strength, pore structure, Thermal analysis, electrical propertiesAbstract
Graphene nanosheets (GNSs) have unique physical properties that make them effective reinforcing materials. In this study Graphene Oxide (GO) was synthesized by oxidation of graphite flakes via modifed Hummer’s method. The produced GO was thermally reduced (exfoliated) at 350 °C for 6 hours to produce graphenenano sheets. The influence of GO and GNSs reinforcement on mechanical properties, pore structure, thermal stability and electrical characteristics of the hardened cement composites was investigated. GO and GNSs were added at different percentages of 0, 0.01, 0.02, 0.03, 0.04 and 0.05 wt. % of cement. Compressive strength was determined at 28 days of curing. Thermo-gravimetric analysis (TGA) was used to detect the phase decomposition, the pore structure was studied using nitrogen adsorption at 77.35 °K technique, the microstructure was examined using scanning electron microscopy (SEM), and finally, electrical conductivity of GO/graphene-cement composites was also studied. Results revealed that, considerable enhancements in compressive strength by about 33% have been achieved by incorporating GNSs into cement matrix by about 0.04%. The integration of graphene into cement has significantly reduced the pore size of the pastes and led to a considerable improvement in the microstructure, with a consequent improvement in the electrical conductivity of these composites.References
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