Effects of nano-modified polymer cement-based materials on the bending behavior of repaired concrete beams

Abstract

As the use time of concrete structures increases, defects such as concrete cracks, corrosion and exposure of steel bars gradually appear, resulting in additional repair of concrete structures to increase their durability and life. In this article, the effects of nano-modified polymer cement-based materials as repair material on the bending behavior of repaired concrete beams were studied. Based on the moment, deflection, strain, surface quality and cracking development monitor of repaired concrete beams, the bending behavior of repaired beams with polymer, nano-modified polymer and fibers was compared and the failure mechanism of the beams was analyzed. The results showed that the nano-modified polymer cement-based materials are helpful in improving the performance of repaired beams, manifested by the increase in the ultimate bending moment and the significant improvement in the quality of the interface between repair and matrix concrete. Compared with polymer cement-based materials, nano-modified polymer cement-based materials result in a 27% increase in ultimate bending moment of the repaired beam and a 58% increase in cracking moment, while reducing the total number of cracks by 23% and the average width of cracks by 17% in the repaired beam. This article demonstrated the availability of nanomaterials for improving the loading behavior of structural components with polymer-modified cement-based materials.

Experimental Investigations on Bond Behavior between FRP Bars and Advanced Sustainable Concrete

“…Compared to steel, FRP composites are not only immune to corrosion but also offer extraordinary tensile resistance [ 18 , 19 ]. It is therefore finding use as fiber-reinforced concrete structures [ 20 , 21 , 22 , 23 ], strengthening jacket systems [ 24 , 25 , 26 , 27 ], or reinforcing bars [ 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 ] in infrastructure. Special attention should be given to FRP bars reinforced concrete, where the majority of the tensile load is expected to be carried by FRP bars.…”