The hydration of cement generates heat due to the exothermic nature of the hydration process. Poor heat dissipation in mass concrete results in a temperature gradient between the inner core and the outer surface of the element. High temperature gradients generate tensile stresses that may exceed the tensile strength of concrete thus leading to thermal cracking. The present paper is an attempt to understand the thermal (heat sink property) and microstructural changes in the hydrated graphene-Portland cement composites. Thermal diffusivity and electrical conductivity of the hydrated graphene-cement composite were measured at various graphene to cement ratios. The mass-volume method was implemented to measure the density of the hydrated graphene-cement composite. Particle size distribution of Portland cement was measured by using a laser scattering particle size analyzer. Heat of hydration of Portland cement was assessed by using a TAMAIR isothermal conduction calorimeter. Scanning electron microscopy (SEM) was implemented to study microstructural changes of the hydrated graphene-cement composites. The mineralogy of graphene-cement and the hydrated graphene-cement composites was investigated by using X-ray diffraction. The findings indicate that incorporation of graphene enhances the thermal properties of the hydrated cement indicating a potential for reduction in early age thermal cracking and durability improvement of the concrete structures.
 A. Sedaghat, A. Zayed and P. Sandberg, “Measurement and Prediction of Heat of Hydration of Portland Cement Using Isothermal Conduction Calorimetry,” Journal of Testing and Evaluation, Vol. 41, No. 6, 2013, 8 p.
 M. Azenha and R. Faria, “Temperatures and Stresses due to Cement Hydration on the R/C Foundation of a Wind Tower—A Case Study,” Engineering Structures, Vol. 30, No. 9, 2008, pp. 2392-2400.
 H. Alkhateb, A. Al-Ostaz, A.-D. Cheng and X. Li, “Materials Genome for Graphene-Cement Nanocomposites,” Journal of Nanomechanics and Micromechanics, Vol. 3, No. 3, 2013, pp. 67-77.
 J. Makar, J. Margeson and J. Luh, “In Carbon Nanotube/ Cement Composites-Early Results and Potential Applications,” Proceedings of the 3rd International Conference on Construction Materials: Performance, Innovations and Structural Implications, Vancouver, 22-24 August 2005, pp. 1-10.
 M. Vandamme and F. J. Ulm, “Nanogranular Origin of Concrete Creep,” Proceedings of the National Academy of Sciences, Vol. 106, No. 26, 2009, pp. 10552-10557.
 A. Peyvandi, P. Soroushian, N. Abdol and A. M. Bala Chandra, “Surface-Modified Graphite Nanomaterials for Improved Reinforcement Efficiency in Cementitious Paste,” Carbon, Vol. 63, 2013, pp. 175-186.
 S. Lv, Y. Ma, C. Qiu, T. Sun, J. Liu and Q. Zhou, “Effect of Graphene Oxide Nanosheets of Microstructure and Mechanical Properties of Cement Composites,” Construction and Building Materials, Vol. 49, 2013, pp. 121-127. http://dx.doi.org/10.1016/j.conbuildmat.2013.08.022
 M. V. Diamanti, M. Ormellese and M. P. Pedeferri, “Characterization of Photocatalytic and Superhydrophilic Properties of Mortars Containing Titanium Dioxide,” Cement and Concrete Research, Vol. 38, No. 11, 2008, pp. 1349-1353.
 D. Chung, “Comparison of Submicron-Diameter Carbon Filaments and Conventional Carbon Fibers as Fillers in Composite Materials,” Carbon, Vol. 39, No. 8, 2001, pp. 1119-1125.
 M. Morsy, S. Alsayed and M. Aqel, “Hybrid Effect of Carbon Nanotube and Nano-clay on Physico-Mechanical Properties of Cement Mortar,” Construction and Building Materials, Vol. 25, No. 1, 2011, pp. 145-149.
 S. Musso, J.-M. Tulliani, G. Ferro and A. Tagliaferro, “Influence of Carbon Nanotubes Structure on the Mechanical Behavior of Cement Composites,” Composites Science and Technology, Vol. 69, No. 11-12, 2009, pp. 1985-1990. http://dx.doi.org/10.1016/j.compscitech.2009.05.002
 I. Campillo, A. Guerrero, J. S. Dolado, A. Porro, J. A. Ibáñez and S. Goñi, “Improvement of Initial Mechanical Strength by Nanoalumina in Belite Cements,” Materials Letters, Vol. 61, No. 8, 2007, pp. 1889-1892.
 Z. Li, H. Wang, S. He, Y. Lu and M. Wang, “Investigations on the Preparation and Mechanical Properties of the Nano-Alumina Reinforced Cement Composite,” Materials Letters, Vol. 60, No. 3, 2006, pp. 356-359.
 H. Li, M. Zhang and J. Ou, “Abrasion Resistance of Concrete Containing Nano-Particles for Pavement,” Wear, Vol. 260, No. 11, 2006, pp. 1262-1266.
 H. Li, M. Zhang and J. Ou, “Flexural Fatigue Performance of Concrete Containing Nano-Particles for Pavement,” International Journal of Fatigue, Vol. 29, No. 7, 2007, pp. 1292-1301.
 Y. Qing, Z. Zenan, K. Deyu and C. Rongshen, “Influence of Nano-SiO2 Addition on Properties of Hardened Cement Paste as Compared with Silica Fume,” Construction and Building Materials, Vol. 21, No. 3, 2007, pp. 539-545. http://dx.doi.org/10.1016/j.conbuildmat.2005.09.001
 J. Vera-Agullo, V. Chozas-Ligero, D. Portillo-Rico, M. García-Casas, A. Gutiérrez-Martínez, J. Mieres-Royo and J. Grávalos-Moreno, “Mortar and Concrete Reinforced with Nanomaterials,” Nanotechnology in Construction, Vol. 3, 2009, pp. 383-388.
 W. Wei and X. Qu, “Extraordinary Physical Properties of Functionalized Graphene,” Small, Vol. 8, No. 14, 2012, pp. 2138-2151. http://dx.doi.org/10.1002/smll.201200104
 K. M. F. Shahil and A. A. Balandin, “Thermal Properties of Graphene and Multilayer Graphene: Applications in Thermal Interface Materials,” Solid State Communications, Vol. 152, No. 15, 2012, pp. 1331-1340.
 A. V. Eletskii, I. M. Iskandarova, A. A. Knizhnik and D. N. Krasikov, “Graphene: Fabrication Methods and Thermophysical Properties, Physics-Uspekhi, Vol. 54, No. 3 2011, pp. 227-258.
 P. A. Basnayaka, M. K. Ram, E. K. Stefanakos and A. Kumar, “Supercapacitors Based on Graphene-Polyaniline Derivative Nanocomposite Electrode Materials,” Electrochimica Acta, Vol. 92, 2013, pp. 376-382.
 H. Gómez, M. K. Ram, F. Alvi, P. Villalba, E. L. Stefanakos and A. Kumar, “Graphene-Conducting Polymer Nanocomposite as Novel Electrode for Supercapacitors,” Journal of Power Sources, Vo. 196, No. 8, 2011, pp. 4102-4108. http://dx.doi.org/10.1016/j.jpowsour.2010.11.002
 F. Alvi, M. K. Ram, P. A. Basnayaka, E. Stefanakos, Y. Goswami and A. Kumar, “GraphenePolyethylenedioxythiophene Conducting Polymer Nanocomposite Based Supercapacitor,” Electrochimica Acta, Vol. 56, No. 25, 2011, pp. 9406-9412.
 P. S. Gaal, M. A. Thermitus and D. E. Stroe, “Thermal Conductivity Measurements using the Flash Method,” Journal of Thermal Analysis and Calorimetry, Vol. 78, No. 1, 2004, pp. 185-189.
 W. K. Brown and K. H. Wohletz, “Derivation of the Weibull Distribution Based on Physical Principles and its Connection to the Rosin-Rammler and Lognormal Distributions,” Journal of Applied Physics, Vol. 78, No. 4, 1995, pp. 2758-2763. http://dx.doi.org/10.1063/1.360073