Experimental study on the anti-blast performance of polyurea reinforced concrete arch structures

In order to study the anti-blast performance of the concrete arch structure strengthened by polyurea, the bottom (inner side) of the concrete arch structure is reinforced by coating polyurea with different thicknesses, which conducts anti-blast tests on the composite arch structure under the blast load of TNT in the air. The test recorded the dynamic response data of arch structure under the action of blast load, including reflected pressure at the vault, strain of the bars and deformation of arches. In order to further evaluate the damage of the arch under blast load, quasi-static loading tests were carried out on the residual bearing capacity of the damaged arch structures. Through the analysis of the damage to the arch structure after blast load, this paper clarifies the reinforcement mechanism of polyurea on concrete arch structure. Compared with the reinforced concrete(RC)arch structure, the damage and deformation of the composite arch can be controlled by coating polyurea, thus further improving the structural integrity of the composite arch after blast load. The experimental results show that anti-blast capacity and ductility characteristics of the arch strengthened by polyurea have improved than those of RC arch structure, and the overall mechanical properties of the composite arch structure have strenthened with the increase of the polyurea reinforced thickness. By adopting the rational design of polyurea reinforcement layer and concrete arch structure, a protective structure with better anti-blast performance can be manufactured.