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A rapid method for determining the yellowing property of gypsum mortar

A technology for gypsum mortar and cement mortar, which is used in the measurement of color/spectral properties, etc.

Active Publication Date: 2021-04-27
NIPPON PAINT CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] In the above national standards, the yellowing test is not included in the standard, however, the yellowing of gypsum mortar will cause many problems in actual use
At present, there is no standard in this field that can effectively judge the yellowing of gypsum mortar

Method used

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  • A rapid method for determining the yellowing property of gypsum mortar
  • A rapid method for determining the yellowing property of gypsum mortar
  • A rapid method for determining the yellowing property of gypsum mortar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] 1# Gypsum Mortar Yellowing Test

[0104] 1# gypsum mortar is made test plate according to the steps of the present invention, and the result obtained after soaking is as follows:

[0105] Numbering Percentage of yellowing area after soaking for 24h / % 1 21.4 2 25.2 3 23.8 average value 23.5

[0106] The gypsum mortar was soaked for 24 hours, and the yellowing area percentage was greater than 10%, so the test was terminated, and the yellowing property of the gypsum mortar sample was determined to be unqualified.

Embodiment 2

[0108] 2# Gypsum Mortar Yellowing Detection

[0109] 2# gypsum mortar is made test plate according to the steps of the present invention, and the result obtained through soaking is as follows:

[0110]

[0111]

[0112] The yellowing area percentage of the gypsum mortar soaked for 24 hours was 0.93%, which was less than 10%; in order to further judge the quality of the yellowing property of the gypsum mortar, it was continued to soak for 48 hours, and the yellowing area percentage was found to be 4.27%, which was still less than 10%; Continue soaking until 72h, the yellowing area of ​​the test plate reaches 11.5%, greater than 10%, the yellowing test is terminated, and it is judged that the yellowing property of 2# gypsum mortar is unqualified.

[0113] The above-mentioned gypsum mortar was used for wall coating, and after 7 days of painting, the wall surface appeared blooming phenomenon. Measured by the color difference meter, the L / a / b value of 1# gypsum mortar chan...

Embodiment 3

[0116] 3# Gypsum Mortar Yellowing Test

[0117] 3# gypsum mortar is made test plate according to the steps of the present invention, and the result obtained after soaking is as follows:

[0118]

[0119] The yellowing area percentage of the gypsum mortar soaked for 96 hours was 0%, without the slightest yellowing phenomenon, and it was judged that the yellowing property of 3# gypsum mortar was qualified.

[0120] The above-mentioned gypsum mortar was used for wall coating, and after 7 days of painting, no blooming phenomenon appeared on the wall surface. Measured by the colorimeter, the L / a / b value of 3# gypsum mortar changed to △L / △a / △b=-0.09 / -0.67 / 0.07 before and after 7 days, the b value hardly changed, and the wall surface did not turn yellow. It is consistent with the qualified result of the yellowing test of the gypsum mortar.

[0121] To sum up, the method can simply and quickly test the yellowing property of raw materials for gypsum mortar, so as to reduce the r...

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Abstract

The present invention provides a kind of testing method of quickly measuring the yellowing property of gypsum mortar, specifically, described method is immersion method, and comprises the following steps: (a) take n cement mortar block, put n hard pouring frame The pouring part is filled with gypsum mortar and the sample to be tested is placed on the cement mortar block, compacted with a scraper and the surface is leveled; placed in a standard test environment for curing, brushing the inner wall covering primer, and then placing the test piece horizontally in the water tank The bottom is on the standard sand conforming to GB / T 17671, filled with water and left to stand, at t 1 , t 2 ,...,t m When observing whether the surface of the primer is yellowed and discolored, and take pictures to calculate the percentage X of the yellowed area.

Description

technical field [0001] The invention relates to a method for measuring the performance of gypsum mortar, in particular to a method for measuring the performance of gypsum mortar. Background technique [0002] Gypsum mortar is a newer, more environmentally friendly and more economical national key promotion product. It is mainly made of gypsum as the cementitious material, adding sand, certain admixtures and special compound additives. It is a high-efficiency and energy-saving Plastering materials for interior walls and ceilings of buildings. It not only caters to the current green and environmental decoration theme, but also changes the traditional habit of using cement as the cementitious material, and overcomes the common quality problems of traditional plastering materials such as cracking and hollowing caused by large drying shrinkage and poor adhesion. , with the following construction features: [0003] ◆The plastering layer and the base layer have strong adhesion, c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/25
CPCG01N21/25
Inventor 申立阳林惠赐程金龙
Owner NIPPON PAINT CHINA