碳纤维织物增强水泥基复合材料试验研究

采用轴向拉伸试验研究了碳纤维织物增强水泥基复合材料(TRC)的静力力学性能,试验工况考虑了配网率、短切钢纤维以及碳纤维织物上的预拉力3个因素.试验结果表明:没有掺加短切钢纤维的薄板,随着配网率的增加,碳纤维织物利用率降低,试验过程中纤维层与水泥基层逐渐分离,最终薄板发生剥离破坏;对碳纤维织物施加预拉力能使薄板的开裂应力提高,从而提高TRC构件的正常使用寿命;在薄板中掺入短切钢纤维有助于提高其界面性能,进而使薄板抗拉强度、极限应变均得以提高;与施加预拉力相比,掺入短切钢纤维对薄板力学性能的改善更加显著;对碳纤维织物施加预拉力的同时在薄板中掺入1%的短切钢纤维可显著提高碳纤维的利用率,薄板破坏时碳纤维被完全拉断.

Experimental Investigations on Carbon Textile ReinforcedCementitious Composites

Quasi-static uniaxial tensile behavior of carbon textile reinforced cementitious composites (TRC) was studied,and the factors of reinforcement ratio and short steel fibres and prestress were considered in the tests. The test results showed that the efficiency of carbon fibers decreased with the increase of textile ratio for the TRC plates without steel fibres during the tests,the textile layer and matrix layer were gradually separated,and debonding failure of TRC plates occurred ultimately. Applying prestress force to the textile can increase the initial cracking stress of TRC plates,and thus improved the normal service life of TRC components. Adding steel fibres in TRC plates was helpful to improve the interfacial properties,and thus both the tensile strength and ultimate strain of the plates were enhanced. Compared with the application of prestress to the textile,more pronounced enhancements of mechanical properties were achieved by the addition of steel fibres. Applying prestress to the textile and adding 1% of steel fibres in plates at the same time can significantly improve the efficiency of carbon fibers. Eventually,carbon fibers were completely broken when the plates were damaged.