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A composite material was prepared with high compressive and tensile strength,which was composed primarily of Class G oil well cement,superfine cement,and microfine cement,using a simple mixing method.The compressive strength of the material was maintained by the micron-size green silicon carbide, and the tensile strength was enhanced by the micro steel fiber. The strength test results on day 28 showed that the compressive and tensile strength of the material increased from 44 MPa to 74 MPa and from 3.6 MPa to 18.3 MPa compared with the material without the addition of micron-size green silicon carbide. In addition, the composite material was characterized by various techniques, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric (TG) analysis, and measurement of physical adsorption porosity and specific surface area. We also analyzed the sliding contact angle and the work of adhesion of the material. We found that the micron-size green silicon carbide was adsorbed to the surface of calcium hydroxide (the hydration product of cement) by intermolecular forces. The hydration of cement in the later stage and the hardened structure of the cement were improved, thus increasing the strength of the cement.

iop conference series. earth and environmental science

Preparation of Portland cement with high compressive and tensile strength by the synergistic effect between micron-size green silicon carbide and micro steel fiber