Method for measuring crack resistance of composite coating coated on outer wall

A composite coating and measurement method technology, applied in the field of crack resistance measurement, can solve the problem that crack resistance does not have relevant national or industrial testing standards and methods, and achieve the effect of simple operation

Inactive Publication Date: 2012-07-25
上海天补建筑科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there are no national or industry-related detection standards and methods for the crack resistance of similar coating composite coatings. The present invention aims at this type ...

Method used

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  • Method for measuring crack resistance of composite coating coated on outer wall
  • Method for measuring crack resistance of composite coating coated on outer wall

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A thermal insulation plastering layer composed of polymer plastering mortar and grid cloth, wherein the polymer plastering mortar has a folding ratio of less than 3.0, and the tensile bond strength with cement blocks is greater than 0.6MPa; the mesh cloth is glass fiber mesh Grape cloth, the mass per unit area is 160g / m 2 , Alkali-resistant breaking strength values ​​in the warp and weft directions are all greater than 750 (N / 50mm).

[0033] Among them, the measuring method of the crack resistance of the polymer plastering mortar and the grid cloth is:

[0034] (1) Preparation of pre-cracked slabs: put an asbestos-free fiber cement slab with a specification of 205mm×80mm×3mm into a dynamic anti-cracking instrument for pre-capping, until the cement slab is broken into two pieces, and then put it back together, and use a textured Fix it on the cement board of the same specification with paper, and the front side of the pre-cracked board faces up;

[0035] (2) Prepare th...

Embodiment 2

[0042] An external thermal insulation plastering layer composed of lightweight plastering mortar and mesh cloth, wherein the lightweight plastering mortar has a dynamic crack resistance greater than 0.08mm, and a tensile bond strength with cement blocks greater than 0.7MPa; the mesh cloth is Glass fiber mesh cloth, the mass per unit area is 160g / m 2 , Alkali-resistant breaking strength values ​​in the warp and weft directions are all greater than 750 (N / 50mm).

[0043] The method for measuring the crack resistance of lightweight plastering mortar and grid cloth: includes the following steps:

[0044] (1) Preparation of pre-cracked slabs: put an asbestos-free fiber cement slab with a specification of 205mm×80mm×3mm into a dynamic anti-cracking instrument for pre-capping, until the cement slab is broken into two pieces, and then put it back together, and use a textured Fix it on the unpre-cracked cement board of the same specification with paper, and the front side of the pre-c...

Embodiment 3

[0052] A composite coating composed of ordinary dry powder putty and mesh cloth, wherein the dry powder putty meets the requirements of P-type putty in the JG / T157-2009 standard, with a flexibility of 100mm without cracks and a tensile bond strength of 0.60MPa; The grid cloth is glass fiber mesh cloth, the mass per unit area is 100g / m 2 , Alkali-resistant breaking strength values ​​in the warp and weft directions are all greater than 700 (N / 50mm).

[0053] Wherein the measurement method of the crack resistance of the dry powder putty and the grid cloth composite layer is:

[0054] (1) Preparation of pre-cracked slabs: put an asbestos-free fiber cement slab with a specification of 205mm×80mm×3mm into a dynamic anti-cracking instrument for pre-capping, until the cement slab is broken into two pieces, and then put it back together, and use a textured Fix it on the cement board of the same specification with paper, and the front side of the pre-cracked board faces up;

[0055] (...

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Abstract

The invention relates to a method for measuring the crack resistance of a composite coating coated on an outer wall. The method comprises the following steps of: (1) cutting an asbestos fiber-free cement flat slab into two sections, splicing the two sections again, and fixing the spliced flat slab on a fixed slab to prepare a pre-cracked slab; (2) coating the composite coating with certain thickness on the front side of the pre-cracked slab by using a mold, maintaining, and taking the pre-cracked slab coated with the composite coating out of the fixed plate to obtain a sample slab; (3) measuring the maximum tensile load value F and the extension value L of the sample slab when the composite coating is damaged by using an electronic pull tester, and repeating the step for at least 5 times; (4) taking the value: removing the highest values and lowest values of the tensile load values and the extension values of the sample slab acquired in the (3), and respectively taking an arithmetic mean value of 3 data; and (5) calculating the breaking tensile strength by using a formula that sigma=F/S, and calculating the breaking displacement by using a formula that s=(L-L0)/ L0*1,000.

Description

technical field [0001] The invention relates to a method for measuring the crack resistance, more specifically, relates to a method for measuring the crack resistance of a composite coating used for exterior wall painting. Background technique [0002] In the field of building exterior wall coating, the method of testing crack resistance is generally only for a single product. For example, the plaster mortar for external insulation is characterized by the ratio of compressive strength to flexural strength. The smaller the ratio, the better the crack resistance; External wall putty is characterized by dynamic crack resistance or flexibility. The greater the dynamic crack resistance (or the smaller the diameter of the flexible curved cylinder), the better the crack resistance; the latex paint is characterized by the elongation of the coating film, and the higher the elongation The larger, the better the crack resistance. But in the actual application process, they do not act ...

Claims

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Application Information

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IPC IPC(8): G01N3/28
Inventor 杨生凤缪德忠罗文龙刘静
Owner 上海天补建筑科技有限公司
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