Uniaxial Tensile Behavior of Carbon Textile Reinforced Mortar
Fen Zhou,
Huanhui Liu,
Yunxing Du,
Lingling Liu,
Deju Zhu,
Wei Pan
Affiliations
Fen Zhou
Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of HunanProvince, College of Civil Engineering, Hunan University, Changsha 410082, China
Huanhui Liu
College of Civil Engineering, Hunan University, Changsha 410082, China
Yunxing Du
Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of HunanProvince, College of Civil Engineering, Hunan University, Changsha 410082, China
Lingling Liu
College of Civil Engineering, Hunan University, Changsha 410082, China
Deju Zhu
Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of HunanProvince, College of Civil Engineering, Hunan University, Changsha 410082, China
Wei Pan
Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong, China
This paper investigates the effects of the reinforcement ratio, volume fraction of steel fibers, and prestressing on the uniaxial tensile behavior of carbon textile reinforced mortar (CTRM) through uniaxial tensile tests. The results show that the tensile strength of CTRM specimens increases with the reinforcement ratio, however the textile–matrix bond strength becomes weaker and debonding can occur. Short steel fibers are able to improve the mechanical properties of the entire CTRM composite and provide additional “shear resistant ability” to enhance the textile– matrix bond strength, resulting in finer cracks with smaller spacing and width. Investigations into the fracture surfaces using an optical microscope clarify these inferences. Increases in first-crack stress and tensile strength are also observed in prestressed TRM specimens. In this study, the combination of 1% steel fibers and prestressing at 15% of the ultimate tensile strength of two-layer textiles is found to be the optimum configuration, producing the highest first-crack stress and tensile strength and the most reasonable multi-cracking pattern.
