Experimental Study on the Compressive Performance and Constitutive Relationship of Fiber Reinforced Anti-cracking Concrete in Mountain Tunnel
To address the limitations of ordinary concrete,such as low tensile strength and poor ductility,and to meet the requirements of anti-crack and impermeability for the secondary lining of mountain tunnels,an integrated performance enhancement using fiber composite materials for anti-cracking and impermeability of concrete is proposed.Fiber composite materials,including PVA fibers and high-molecular active materials,are incorporated into the concrete.The compressible packing model is used to design the optimal aggregate packing for fiber reinforced anti-cracking concrete,and the mix ratio for fiber reinforced anti-cracking concrete is determined.Compressive tests are conducted to study the compressive mechanical properties and constitutive model of the fiber reinforced anti-cracking concrete.The research results show that incorporating fiber composite materials into the concrete can improve compressive strength and toughness.There exists an optimal fiber composite material content,when the content does not exceed this optimal level,both the compressive strength and toughness of the concrete are enhanced.However,when the content exceeds the optimal level,both the compressive strength and toughness of the concrete gradually decrease.
万方数据
维普
