%A FENG Yuchen, LI Dihong, BIAN Libo, LI Zixuan, ZHANG Yaqing %T Study on Mechanical and Impact Properties of Aramid Fiber Reinforced Cement Cementitious Composites %0 Journal Article %D 2021 %J Materials Reports %R %P 634-637 %V 35 %N z2 %U {http://www.mater-rep.com/CN/abstract/article_4449.shtml} %8 2021-11-25 %X Aramid fiber has the characteristics of large specific modulus, high specific strength and high toughness, which can greatly improve the properties of cement-based materials. In this paper, the effects of the length and volume dosage of short-cutaramid fiber on the flexural strength, compressive strength and impact resistance of cement-based composite were studied. The micropore structure of the specimen was studied by means of nitrogen adsorption test, and the microscopic morphology was observed by SEM. The results show that the flexure strength and compressive strength of cement-based composite at different ages increase with the increase of volume content or length of aramid fiber, and the impact resistance is excellent, more residual strength can be retained. Longer aramid fiber (6 mm) can better improve the mechanical properties of cement-based composites and refine material pore structure, which are not easy to be damaged under impact load. Too short aramid fiber (1 mm) has limited improvement on the mechanical properties and impact resistance of specimens. The cement-based composite with the length of 6 mm and fiber volume content of 4% has the best comprehensive mechanical properties and the best pore structure.