Molding frame used for testing mortar tensile adhesive strength and using method thereof

Abstract

The invention provides a molding frame used for testing mortar tensile adhesive strength and a using method thereof and belongs to the technical field of building mortar property test. The molding frame comprises an opened side frame, a left connecting side frame, an upper connecting side frame, a buckling opening side frame and a pulling rod, wherein the side frames are mutually hinged through rotary shaft rivets; the pulling rod is arranged in the opened side frame; a buckling groove is formed in the buckling opening side frame; the pulling rod is clamped to and fixed to the buckling groove to form a square molding frame. The molding frame is simple in structure and convenient to operate, the phenomenon that the surrounding edges of a mortar test block warp upwards in the traditional de-molding process is avoided, and the secondary grinding process on the surface of the mortar test block after maintenance is eliminated, so that materials are saved, the working efficiency is improved, and meanwhile the accuracy of a testing result is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of performance testing of building mortar, and in particular relates to a forming frame for testing the tensile bond strength of mortar and a use method thereof. Background technique [0002] Construction mortar is prepared by cementitious material, fine aggregate and water, sometimes mixed with certain admixtures in a certain proportion. Usually the mortar directly forms a whole with the base layer, so the tensile bond strength is an important property of the mortar. At present, the mortar involved in the tensile bond strength test mainly includes the interface mortar and anti-crack mortar used in the external wall insulation system. and adhesives etc. Before carrying out the mortar bond strength test, the important work is to make the mortar regular shape, according to the calculation formula of tensile bond strength: f at =F / A z , where F is the failure load, A z is the bonding area, it can be seen th...

AI Technical Summary

Problems solved by technology

The disadvantage of the prior art is that after each demoulding, the surrounding edges of the mortar forming test block will be lifted up with the lifting of the mold, or the forming surface will be skewed, thus causing the cured mortar test block to be pulled. When testing the tensile bond strength, the steel fixture used for stretching is difficult to bond with the surface of the mortar test block, and the uneven part of the edge needs to be polished with sandpaper. The operation process is cumbersome, difficult to control, the consumption of consumables is large, and the work efficiency is low

In addition, due to the unfavorable factors of the small upper surface area of ​​the mortar test block caused by this demoulding method, the test results are not realistic enough

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