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Method for testing yellowing of plastering gupsum

A technology for plastering plaster and testing methods, which is applied in the direction of color/spectral characteristic measurement, etc. It can solve the problems that cannot directly reflect the actual situation of the project and the yellowing of the surface coating, achieve intuitive test phenomena and results, simple operation, and reduce test costs Effect

Inactive Publication Date: 2018-03-30
SHANGHAI RES INST OF BUILDING SCI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, for example, there are requirements for the content of impurity ions in the standard of general industrial by-product gypsum raw materials, such as "Flue Gas Desulfurization Gypsum" (JC / T 2074-2011), which stipulates that the Cl- content should not exceed 400mg / kg, Although the high content of impurity ions may cause the yellowing of plastering gypsum or its surface coating, there is no public research to show the inevitability of the two; and in actual engineering, it is also found that the yellowing of plastering gypsum is also related to the humidity of the base layer of the wall. Therefore, the test results of impurity ion content alone cannot directly reflect the actual situation of the project, and the test of impurity ion content generally adopts chemical analysis method, which has high requirements for test equipment and enterprise laboratory personnel

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  • Method for testing yellowing of plastering gupsum
  • Method for testing yellowing of plastering gupsum
  • Method for testing yellowing of plastering gupsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Proceed as follows:

[0033] (1) Paint one coat of white primer (without adding general primer) on two cement mortar blocks (drying, moisture content <0.5%) of 120mm×120mm×10mm, and cure for 1d under the standard test environment;

[0034] (2) Keep one piece of test piece (denoted as reference sample) in (1) and continue to maintain it under the standard test environment; the other piece of test piece (denoted as sample) is placed horizontally on the standard sand at the bottom of the water tank, and water is injected to the water surface. At about 5mm on the surface of the mortar block, let it stand still, and observe whether the primer surface of the two test pieces is discolored and yellowed at 4h, 24h, 48h, and 96h respectively.

[0035] In order to study the influence of the moisture content of the base material cement mortar block on the yellowing property of the plastering gypsum, the implementation cases 2, 3 and 4 were designed.

Embodiment 2

[0037] Proceed as follows:

[0038] (1) Place a hard polyvinyl chloride or metal frame with a size of 100mm×100mm×5mm on a 120mm×120mm×10mm cement mortar block (moisture content 14%), fill the frame with plastering plaster, and smooth it with a scraper Surface, after 5 minutes remove the molded frame to be the test piece;

[0039] (2) After the two specimens were cured for 1 day under the standard test environment, they were painted with a white primer (no general primer added); and then cured for 1 day under the standard test environment;

[0040] (3) Continue to maintain one piece of test piece (denoted as reference sample) in (2) under the standard test environment; the other piece of test piece (denoted as sample) is placed horizontally on the standard sand at the bottom of the water tank, and the water is injected to the water surface and the distance from the cement At about 5mm on the surface of the mortar block, let it stand still, and observe whether the primer surfa...

Embodiment 3

[0042] Proceed as follows:

[0043] (1) Place a hard polyvinyl chloride or metal frame with a size of 100mm×100mm×5mm on a cement mortar block (water content 20%) of 120mm×120mm×10mm, fill the frame with plastering plaster, and smooth it with a scraper Surface, after 5 minutes remove the molded frame to be the test piece;

[0044] (2) After the two specimens were cured for 1 day under the standard test environment, they were painted with a white primer (no general primer added); and then cured for 1 day under the standard test environment;

[0045](3) Continue to maintain one piece of test piece (denoted as reference sample) in (2) under the standard test environment; the other piece of test piece (denoted as sample) is placed horizontally on the standard sand at the bottom of the water tank, and the water is injected to the water surface and the distance from the cement At about 5mm on the surface of the mortar block, let it stand still, and observe whether the primer surfac...

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Abstract

The invention discloses a method for testing yellowing of plastering gupsum. The method comprises the following steps: (1) preparing samples, namely, simulating the construction site conditions, and rendering a plastering gupsum layer with certain thickness on a cement mortar block; (2) maintaining two samples prepared in step (1) under a standard test environment until the plastering gupsum is completely hardened; coating white primer on the surface of the plastering gupsum; then maintaining in the standard test environment until the white primer is dry; (3) testing one of the samples obtained in step (2) as a standard sample, and continuously maintaining the standard sample in the standard test environment; horizontally placing another sample obtained in step (2) on standard sand at thebottom of a water injecting container; continuously keeping the water level about 5mm away from the lower surface of the cement mortar block of the sample; allowing standing still; comparing to determine whether the surfaces of the white primers of the two samples are decolored or yellowed within 96h.

Description

technical field [0001] The invention relates to the technical field of building material analysis, in particular to a method for testing the yellowing property of plastering gypsum. Background technique [0002] In recent years, plastering gypsum has been favored by more and more developers, construction units and production enterprises because of its good workability, strong binding force with various bases, breathing function, good fire resistance and thermal performance, etc. Favored, the plastering and gypsum industry has developed rapidly accordingly. However, the following engineering problems have become increasingly prominent, such as common hollowing, powdering, cracking, etc.; and in the past two years, there have been more and more problems such as yellowing and crystallization, which have seriously affected the quality of the project. [0003] The yellowing is mainly because the raw material of plastering gypsum is mainly industrial by-product gypsum (such as de...

Claims

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Application Information

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IPC IPC(8): G01N21/25
Inventor 钱耀丽叶蓓红
Owner SHANGHAI RES INST OF BUILDING SCI CO LTD
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