Abstract
Based on the mechanism of whisker strengthening cement, this study used ethyl orthosilicate (TEOS) to modify CaSO4 whisker (CSW) to improve the mechanical properties of cement matrix. The designed structure and morphology of modified CaSO4 whisker (MCSW) were characterized by means of FTIR, SEM, XRD, contact angle and XPS. The test results showed that SiO2 was successfully grafted on the MCSW due to the reaction between Si(OH)4 and –OH on surface of MCSW. Subsequently, the improvement effect of MCSW on the mechanical properties of cement matrix was investigated, and the mechanism of MCSW reinforced cement stone was studied by means of SEM, XRD, and 29Si NMR. Results indicated that the compressive, flexural and splitting tensile strength of cement with MCSW were 1.86, 2.31, 1.62 times higher than those of cement with CSW, respectively. The triaxial stress-strain curve of MCSWC showed higher strain capacity. The SEM analyses displayed that MCSW was tightly wrapped by hydration products. The XRD and 29Si NMR analyses revealed that SiO2 covered on MCSW surface participated in hydration reaction and form more C-S-H chains, which enhanced the interfacial adhesion between MCSW and cement matrix and thus improved the mechanical properties of oil well cement.
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