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The hydrationof cement generates heat due to the exothermic nature of the hydration process.Poor heat dissipation in mass concrete results in a temperature gradientbetween the inner core and the outer surface of the element. High temperaturegradients generate tensile stresses that may exceed the tensile strength ofconcrete thus leading to thermal cracking. The present paper is an attempt to understand the thermal heatsink property and microstructural changes in the hydrated graphene-Portlandcement composites. Thermal diffusivity and electrical conductivity of thehydrated graphene-cement composite were measured at various graphene to cementratios. The mass-volume method was implemented to measure the density of thehydrated graphene-cement composite. Particle size distribution of Portland cementwas measured by using a laser scattering particle size analyzer.Heat of hydration of Portland cement was assessed by using a TAMAIR isothermal conduction calorimeter. Scanningelectron microscopy SEM was implemented to study microstructural changes ofthe hydrated graphene-cement composites. The mineralogy of graphene-cement andthe hydrated graphene-cement composites was investigated by using X-ray diffraction. The findings indicatethat incorporation of graphene enhances the thermal properties of the hydratedcement indicating a potential for reduction in early age thermal cracking anddurability improvement of the concrete structures.



KEYWORDS

Ceramics; Composite Materials; Graphene; Electrical Conductivity; Thermal Conductivity

Cite this paper

A. Sedaghat, M. Ram, A. Zayed, R. Kamal and N. Shanahan -Investigation of Physical Properties of Graphene-Cement Composite for Structural Applications,- Open Journal of Composite Materials, Vol. 4 No. 1, 2014, pp. 12-21. doi: 10.4236-ojcm.2014.41002.





Autor: Ahmadreza Sedaghat, Manoj K. Ram, A. Zayed, Rajeev Kamal, Natallia Shanahan

Fuente: http://www.scirp.org/



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