Device and method for testing shearing resistance adhesive strength of structural adhesive between reinforcement material and concrete

Abstract

A device and method for testing the shear bond strength of structural adhesive between reinforcement materials and concrete, characterized in that it includes an upper hanger arranged on the outer edge of the upper concrete test block and a lower hanger arranged on the outer edge of the lower concrete test block. A V-shaped protrusion is arranged at the middle position of the bottom surface of the rack, and a V-shaped groove is arranged at the middle position of the top surface of the lower hanger to cooperate with the V-shaped protrusion of the upper hanger, and the V-shaped protrusion pivots at a certain angle around the contact line in the groove. The specific steps of the test method are to place the upper hanger on the lower hanger so that the V-shaped protrusion is placed in the V-shaped groove and fixed with a positioning strip; the reinforcement material is pasted to the side of the test block with structural glue, and the reinforcement material is placed on the side of the test block. The sticking areas of the two test blocks are equal. After the structural adhesive is completely cured, remove all the positioning covers and all the positioning strips on one side of the concrete test block, and apply pressure so that the concrete test block has a tendency to pivot around the V-shaped convex contact line. Thus, when the shear bond force is generated and reaches the limit value and is destroyed, the shear bond strength can be calculated.

Description

technical field [0001] The invention is mainly used in the field of construction science and technology, and in the reinforcement and transformation of concrete structures, the device and method for testing the shear bond strength of structural glue bonding reinforcement materials and concrete substrates. Background technique [0002] In the reinforcement and renovation project of concrete structure engineering, there are technical measures that need to paste reinforcement materials such as steel plates and composite reinforcing fibers on the concrete substrate. Such measures use structural glue to paste the reinforcement material on the concrete matrix, give full play to the characteristics of high tensile strength of the reinforcement material, and achieve the purpose of reinforcement. The key to this technology lies in the coordinated deformation and joint stress of the reinforcement material and the concrete matrix. The coordinated deformation between the two is complete...

AI Technical Summary

Problems solved by technology

However, this invention patent can only detect the bonded shear strength of reinforcement materials with a certain thickness. It is necessary for the force transmission shoe to resist and push the slab to cause shear failure between it and the concrete substrate. For the slab with a small thickness ( 1~2mm) and fiber cloth (0.111~0.167mm) and other reinforcing materials, since it is difficult for the force transmission boots to only touch the reinforcing material without contacting the concrete, it is often impossible to push the slats or fiber cloth to cause shear failure. The use of the method has certain limitations; when using this invention patent, the reinforcement material is subjected to pressure, which is inconsistent with the tension in the actual project; when using this invention patent, the reinforcement material needs to be cut, not only the reinforcement material and the reinforced material There is some damage to the component, and the high temperature generated during cutting will affect the performance of the bonding material and affect the test results

Therefore, this invention patent cannot fully adapt to the test of the shear bond strength of the structural adhesive between the reinforcement material and the concrete

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