Method for detecting tensile bond strength of masonry mortar and wall material

Abstract

The invention discloses a method for detecting tensile bond strength of masonry mortar and a wall material. The method mainly comprises the following steps of: (1) drawing a core sample of a masonry mortar layer when the masonry mortar reaches a specified age; (2) cutting the sample in the direction perpendicular to the masonry mortar layer on a wall material layer, wherein the sample has the same size as a horizontal projection plane of a top drawing plate; (3) placing clamping parts on the lower parts of two clamping plates on a side face of the sample, clamping the top drawing plate in grooves on the upper parts of the two clamping plats, and fixedly connecting the two clamping plates through a fastener to clamp the wall material layer through the two clamping plates; (4) placing the core sample on solid ground, keeping the mortar layer horizontal, and placing a supporting cushion block aside; and (5) mounting a tensile bond strength detector on a joint of the top drawing plate to perform testing. Compared with the prior art, the tensile bond strength of the masonry mortar and the wall material can be quickly and conveniently determined; and the method has the advantage of environmental friendliness.

Description

technical field [0001] The invention relates to a method for detecting the tensile bonding strength of masonry mortar, in particular to a method for detecting the tensile bonding strength of masonry mortar and wall materials. Background technique [0002] Mortar is a commonly used building material, which plays the role of bonding, lining and transmitting stress in civil engineering, including masonry mortar, plastering mortar, ground mortar and other types. Through the bonding of mortar and other materials, it becomes a whole, so the bond strength of mortar is very important. [0003] In recent years, with the development of ready-mixed mortar technology, more and more attention has been paid to the bonding performance of mortar. Unlike traditional mortars that only focus on work performance and compressive strength, the "Ready-Mixed Mortar" (JG / T 230-2007) standard also proposes tensile bond strength requirements for plastering mortars and waterproof mortars. [0004] In...

AI Technical Summary

Problems solved by technology

[0013] (1) It is necessary to paste the semicircular slider on the wall material layer of the core sample with an adhesive. The adhesives usually used require the bonding surface to be dry, and water is usually used when pulling the core and cutting the sample, and it takes a long time to wait. After a long time, the sample can be pasted after drying, so it is necessary to bring the sample back to the laboratory for experimentation, and there may be problems of poor adhesion caused by the wet bonding surface

[0014] (2) When pasting the semicircular slider, it is very difficult to center it

However, poor alignment will lead to eccentric tension and tearing of the mortar layer, so that the real bond strength between the masonry mortar and the wall material cannot be measured, and the experimental data has a large dispersion

[0015] (3) Since the radians of the core sample and the semicircular slider are often different, more adhesives are needed to bond them firmly, and the adhesives used are disposable materials, which have environmental pollution problems

[0016] (4) For wall materials such as concrete small hollow blocks, due to the cavity in itself, the core-like wall material layer is not semicircular, making it difficult for the slider to bond

[0017] (5) After the experiment, the cleaning of the adhesive on the surface of the slider is very time-consuming and laborious

[0018] (6) The core sample after the test can only be discarded and cannot be reused; the empty space after core pulling needs to be filled with other materials, which is not environmentally friendly

[0019] (7) Since there is usually a difference in the tensile bond strength between the mortar and the wall materials on both sides, only the bond tensile strength between the masonry mortar and the wall materials on one side can be obtained

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