Experimental investigation and model analysis of uniaxial compressive behavior, micro properties and sustainability of fiber-reinforced concrete designed by cost-efficiency fibers
摘要
The lower strength of lining concrete directly affects the safety of tunnels. The fiber hybrid strategy for designing fiber reinforced concrete (FRC) is an effective way to strengthen lining concrete. In this study, 16 groups of FRC mixed with Cellulose, Polyvinyl alcohol, Polyolefin fibers were designed, and the uniaxial compressive characteristics of FRC was conducted to assess the energy-absorption behavior, toughness and the damage evolution, and the toughening mechanism of hybrid fibers was revealed, and finally the sustainability of FRC was evaluated. Meanwhile, a new compressive constitutive model was proposed and was verified via using test data from other studies. The FRC mixed with less fibers were applied into reinforced maintenance of tunnel to verify the application potential of cost-efficient FRC. Overall, this study can provide some experimental data or new insights for the precise design and analysis of FRC structures.