Test device and test method for building structural adhesive bonding tensile stress relaxation

Abstract

The invention provides a test device and a test method for testing building structural adhesive bonding tensile stress relaxation. The test device comprises a fixed support, a tensioning device, a test piece, a fixture and a digital dynamometer, wherein the test piece is detachably mounted on the fixture and receives the tensile force from tensioning device through the fixture. The test method comprises the steps as follows: the cured test piece is assembled on the test device; a turnbuckle of the tensioning device is rotated to adjust the force applied to the test piece; the test device is entirely placed on an outdoor natural exposure field or selectively placed in a manual ageing chamber, so that the tensile stress under the corresponding ageing condition can be measured; the tensile stress after ageing is compared with the tensile stress before ageing, so that the tensile stress relaxation coefficient can be obtained. By the aid of the test device and the test method, building structural adhesive bonding tensile stress relaxation after various ageing tests can be tested, changes of the tensile stress can be monitored in real time, and a means is provided for evaluation of the bonding ageing durability and prediction of the service life of a building structural adhesive.

Description

technical field

[0001] The invention belongs to the technical field of building structure adhesive testing, and in particular relates to a testing device and a testing method for testing building structural adhesive bonding tensile stress relaxation. Background technique

[0002] Building structural adhesive (hereinafter referred to as structural adhesive) is a commonly used structural bonding material in construction. It is generally used for glass installation in building curtain walls and doors and windows. It has high bonding strength and can firmly bond glass to metal attached frames. In addition, it also has good aging resistance. At present, the evaluation of the aging resistance of structural adhesives is mainly by testing the changes in the tensile bond strength of bonded specimens after low temperature, high temperature, water immersion and load cycles, etc., to characterize the structural adhesive’s resistance to external environmental factors. Aging performance,...

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