Effect of Modified Basalt Fiber on Mechanical Properties of Oil Well Cement
Aiming at the problems of smooth surface and easy agglomeration of basalt fiber(BF),the surface of BF was modified by coating method in this paper.A hydrophilic cationic coating agent was prepared by polymethacrylic acid,coupling agent KH-570 and cetyltrimethylammonium chloride,and it was coated on the surface of BF to obtain modified basalt fiber(MBF).The structure of MBF was characterized by infrared spectroscopy(FT-IR),scanning electron microscopy(SEM),X-ray photoe-lectron spectroscopy(EDS),optical contact angle measuring instrument and Zeta potentiometer.The results of FT-IR,SEM and EDS analysis showed that the surface of MBF was rough and contained hy-drophilic carboxyl,hydroxyl and quaternary ammonium groups.The contact angle test results show that the hydrophilicity of MBF is greatly improved after modification.The results of Zeta potential test showed that the absolute value of Zeta potential of MBF was significantly higher than that of BF.The dispersion properties of the fibers were evaluated by image analysis.The results showed that the distri-bution coefficient of MBF was 73%higher than that of BF,and it had better dispersion.The effect of MBF on the mechanical properties of oil well cement was studied.The results show that when the ce-ment stone is cured for 2 d,the curing temperature is 80℃,and the fiber content is 2%,the com-pressive strength and flexural strength of the MBF cement stone are 40.1%and 37.1%higher than those of the blank cement stone,respectively.Compared with BF cement stone,the compressive strength and flexural strength of MBF cement stone were increased by 26.6%and 21.4%,respective-ly.Through the single fiber pull-out test,it is found that the bonding performance of MBF and cement is 35.5%higher than that of BF.Combined with the SEM analysis of MBF cement stone,which shows that the surface coating modification of BF increases its dispersion in cement stone,and the surface roughness of fiber increases,which also enhances the bonding performance between fiber and cement and improves the mechanical properties of cement stone.
oil well cementbasalt fibermechanical propertysurface modificationdispersibility
万方数据
维普
