碳纳米管增强水泥复合材料的制备及其力学性能的研究

摘要

In this paper,the direct and indirect doping MWCNT methods were applied to prepare carbon nanotubes reinforced cementitious composite material.The drying shrinkage,tensile strength,compressive strength and interfacial reaction of MWCNT and cement were investigated by electronic universal-testing machine and Fourier transform infrared spectrometer.Results show that the MWCNT/cement composite prepared by indirect doping method displays higher tensile and compressive strength than that by direct doping.With 0.1 wt％ MWCNT doping amount,the tensile and compressive strength of indirect doping prepared MWCNT/cement composite can be improved by 25 ％ and 31.1％,respectively,as compare to cement material without doping.The mechanical strength improvement is mainly contributed by good interfacial compatibility between MWCNT and cement.Besides that,cluster formation of carbon fibre in MWCNT/cement composite can be effectively avoided by indirect doping method,which is also a key contributor.%采用直接掺杂和间接掺杂MWCNT的方法,制备了MWCNT增强水泥基复合材料.利用电子万能试验机和傅里叶变换红外光谱仪研究复合材料的干燥收缩性、抗拉强度、抗压强度以及MWCNT与水泥的界面反应.结果表明,间接法制备的MWCNT/水泥复合材料的抗拉和抗压强度均明显高于直接法,0.1％(质量分数)MWCNT掺杂量下,间接法制备的MWCNT/水泥复合材料抗拉强度比水泥基体可大幅提高25％和31.1％,这主要由于MWCNT与水泥之间具有良好的界面相容性以及间接法制备的MWCNT/水泥复合材料可以有效避免直接法制备复合材料中MWCNT的团聚现象,从而大幅提高MWCNT/水泥复合材料的力学性能.