Experimental Study Of Fiber Reinforced Cementitious Composites And Its Prospect Of Application In Jointless Bridges

Bridge expansion joints is a weak point in the bridge structure and it can bring the fatal damage to the bridge structure.The foreign and domestic researchers believe that the most effective means to solve those problems of the bridge structure is to design and transform the bridge into seamless.In view of this point,this paper proposes a seamless scheme based on the engineering practice and the structural characteristics of the bridge.That is to say that a kind of ductile material is designed in the expansion joint of the original bridge design,and connect the abutment and bridge hinge parts,known as the joint section.The deformation of the elastic material is combined to absorb the deformation caused by the temperature effect.This seamless bridge can not only meet the requirements of temperature deformation,but also to eliminate the bridge expansion joints caused by the adverse effects of the bridge to improve the ability to resist disasters.Fiber reinforced cementitious composites is an important product of modern society to improve the performance of concrete.It has a good ductility and the ability to withstand deformation,the international community has been used for bridge expansion joints at the case.In order to study the feasibility of using domestic fiber reinforced cement-based composites for the design of domestic bridge seamless design,this paper studied the localization of fiber-reinforced cement-based composites by material selection test and mix optimization experiment,The pseudo-strain hardening performance,flexural toughness and deformation ability of the synthetic fiber reinforced cement-based composites were verified by uniaxial direct tensile test and four-point bending test.Based on the experimental data and theoretical knowledge of this experiment,the results of domestic fiber-reinforced cement-based composites show that the ultimate tensile strain and the pseudo-strain hardening behavior of the domestic fiber reinforced cement-based composites meet the requirements of high performance fiber reinforced cement material’s requirements,and it has the realistic feasibility to use in the jointless bridge.