Preparing Modified-graphene-reinforced Cement-based Composite Material by Hot-pressing Process for Microstructure, Thermal Conductivity and Mechanical Properties Amelioration
WU Qisheng1, CHEN Baorui2, ZHU Huajun1, MIN Zhian3
1 School of Materials Engineering, Yancheng Institute of Technology, Yancheng 224051; 2 School of Materials Science and Engineering, Changzhou University, Changzhou 213164; 3 College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029
Abstract: Using silane coupling-agent-modified graphene, a series of graphene-reinforced cement-based composites (differing in coupling agent content and ball milling duration)were prepared by a hot-pressing process and the resultant composites’ perfor-mances were examined. X-ray diffraction(XRD), scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FTIR)and N2 absorption BET surface area analyser were employed to study microstructure of the composite. The results showed that the combination of a 1% dosage of coupling agent and a 1% dosage graphene can achieve a thermal conductivity and a compressive strength of 3.132 3 W/(m·K)and 54.9 MPa (42.07% and 28.87% higher than the composite without coupling agent modification), respectively; the ball milling can improve the dispersibility of graphene in composite, and when the milling time, graphene dosage and coupling agent dosage are 0.5 h,1.5%,1% respectively, a reinforced cement-based composite with a thermal conductivity of 3.687 2 W/(m·K)and a compressive strength of 57.4 MPa can be obtained. The microstructure and pore structure analysis showed that the composite prepared by hot-pressing process has lower porosity and more dense structure than the blank sample.
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2018, Vol. 32 
