Application of nanofiber composites in improving shear resistance and durability of buildings

Abstract

In order to improve the shear performance of reinforced concrete beams and improve the shear bearing capacity of concrete beams, the author proposes a scheme based on flax fiber cloth to strengthen the shear performance of reinforced concrete beams, by studying the effects of different treatment methods and preparation process parameters on the mechanical and interfacial properties of composites, the improvement mechanism of the mechanical and interfacial properties of flax fiber composites was revealed, and through the high performance of flax fiber and its composite materials, the bearing characteristics and failure modes of reinforced concrete beams reinforced with flax fiber cloth, verification of the increase in shear capacity and the effectiveness of structural reinforcement of reinforced concrete beams reinforced with flax fiber cloth. Experimental results show that: After the reinforced concrete beam was reinforced with nano-TiO2-grafted flax fiber cloth, its shear bearing capacity reached 653 kN, and the mid-span limit deflection value of the concrete beam reached 14.6 mm, which was greatly increased by about 6.3 mm compared with the unreinforced one. Conclusion: The reinforced concrete beam reinforced with flax fiber cloth should not only meet the bearing capacity requirements, but also meet the ductility requirements of the structure.

Keywords

• Nanofibers
• Composite materials
• Reinforced concrete reinforcement
• Shear resistance
• Deflection