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Test method for shearing strength of fluid sealant and bonded substrate bonding sample interface

A technology of shear strength and test method, which is applied in the direction of applying stable tension/pressure to test the strength of materials, etc., to achieve the effect of easy use, easy promotion, and simple operation

Inactive Publication Date: 2009-07-15
NORTHWEST A & F UNIV
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Problems solved by technology

However, the method of simulating the shear strength of composite bonding surfaces under actual working conditions has not been reported yet.

Method used

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  • Test method for shearing strength of fluid sealant and bonded substrate bonding sample interface

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Embodiment Construction

[0011] see figure 1 , according to the technical scheme of the present invention, the substrate 2 (concrete) to be adhered is first made into two T-shaped samples, the two T-shaped samples are placed symmetrically, and a gap cavity of a certain size is reserved in the middle, and the sealant 3 is filled Put in, make the concrete 2 and the sealant 3 form a bonded sample as a whole, and then put it in an environment with a temperature of 20±2°C and a relative humidity of 65±5% for 28 days;

[0012] During the test, place the concrete 2 in the fixture 1, connect the fixture 1 to the tensile machine, start the tensile machine at a rate of 5mm / min, and pull the concrete 2 in opposite directions until the sealant 3 and the concrete 2 are completely peeled off. At this time, the maximum tensile value P (in Newton (N)) is the value of the shear force between the adhesive interface between the sealant 3 and the concrete 2, and the shear force is divided by the shear area, which is the ...

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Abstract

The invention discloses a method for testing the interface shear resistant strength of the sample bonded by sealant and base material. The method comprises: forming the base material into to T-shaped samples with a joint cavity of a certain size reserved therebetween; filling sealant to bond the base material and the sealant into an integral bonded sample body; maintaining in the environment with temperature of 20+ / -2 degrees centigrade and relative humidity of 65+ / -5% for 28 days; fixing the two ends of the sample in the chucks; connecting two ends of the chuck respectively with a pulling force machine; running the pulling force machine in 5mm / min to pull the bonded base material to opposite directions untile the sealant and the base material are detached completely; defining the maximum pulling force value as the shearing force value of the interface of sealant and base material; and obtaining the shearing strength by dividing the shearing force by the shear area. The method can be used for test the interface shear resistant strength of the sample bonded by sealant and base material, achieves the advantages of simple operation and convenient using, need not adding other equipments, is convenient for popularization; it can test the shearing strength of any composite material structure, has good instructiveness to engineering practice.

Description

technical field [0001] The invention belongs to the field of performance testing of building materials, in particular to a method for testing the shear strength of the interface between a sealant and a bonded base material. Background technique [0002] At present, the methods for testing the shear performance of single materials such as concrete are well established. However, the method of simulating the shear strength of composite bonding surfaces under actual working conditions has not been reported yet. When the sealant is used as a caulk or joint material in concrete construction joints or expansion joints, the bonding interface is often the weakest part of the impermeability. Since the bonding surface is composed of two materials, first of all, the void ratio, void pattern, roughness of the surface of the substrate to be bonded, and the type, ratio, and viscosity of the polymer sealant all affect the shear strength. In addition, the cleanliness, roughness, dryness an...

Claims

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Application Information

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IPC IPC(8): G01N3/08
Inventor 张慧莉汪有科田堪良何武全娄宗科姚汝方
Owner NORTHWEST A & F UNIV
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