Abstract
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.
Highlights
Concrete is widely used as the main material in various construction projects including houses, bridges, tunnels and other structures
When the concrete beam was loaded, the repair materials had been cured for 14 days and the control concretes had been cured for 28 days
The results showed that the compressive strength of the repair materials at the age of 14 days and that of the control concretes at the age of 28 days were approximately the same
Summary
Concrete is widely used as the main material in various construction projects including houses, bridges, tunnels and other structures. As the use time of concrete structures increases, defects such as concrete cracks, corrosion and exposure of steel bars gradually appear, which affect the safety of the structure. Cracks appear in the tension area of concrete beams during the service process of the beam due to the low tensile strength of concrete. With time, these cracks lead to the corrosion of reinforcement, and the corrosion of steel bars can lead to concentration of internal stresses in the concrete and reduction in bond, resulting in further cracking and deterioration [1]. It is necessary to study the new repair materials for the rehabilitation of reinforced concrete beams
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