Test method for bonding stress between fiber reinforced plastic bar and concrete

Abstract

The invention relates to a test method for bonding stress between a fiber reinforced plastic(FRP) bar and concrete, comprising the following steps that: step 1, casting a bonding specimen (7) of the FPR bar and the fiber bar concrete, providing a single-mode fiber (b) as a strain sensor to work with the FRP bar for the production molding of a FRP bar-fiber bar (graph 1), then casting the FRP bar-fiber bar central drawing sample, simultaneously casting three concrete cubic specimens for detecting the intensity of the concrete, wherein, the length, width and height of the concrete cubic specimen are all 150 mm; step 2, maintaining the bonding specimen of the FPR bar and the fiber bar concrete for 28 days according to the < concrete intensity standards >. The test method provided by the invention is accurate and reliable.

Description

technical field [0001] The invention relates to the technical field of testing the bonding performance of novel composite FRP (fiber composite reinforced rib) and concrete. Background technique [0002] Reinforced concrete structure is a structural form widely used in the field of industrial construction. The combination of steel bars and concrete can greatly improve the mechanical properties and performance of concrete structures. However, steel bars will corrode when exposed to aggressive media such as water, acid and alkali, especially in bridges, tunnels, ports and infrastructures. Since the structural durability caused by the corrosion of steel bars has become one of the main problems faced by reinforced concrete structures, people have been looking for reinforcement bars that can replace steel bars in concrete. Fiber reinforced bars are made of long fiber composite materials and resins through special extrusion and molding processes (hereinafter referred to as FRP bar...

AI Technical Summary

Problems solved by technology

However, the pasted strain gauges are usually point-type, reflecting the internal strain at several points, and the strain gauges are easily damaged during the vibrating process of concrete specimens, and there is a problem of low survival rate.

[0006] In short, there are more or less problems in the bond performance test used to reflect the bond-slip constitutive relationship between reinforcement and concrete, such as the large dispersion of test results and the inability to directly measure the internal stress distribution of the bond between reinforcement and concrete. problem, then a better test method needs to satisfy:

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