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Method for rapidly determining yellowing property of gypsum mortar
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A technology of gypsum mortar and cement mortar, applied in the direction of color/spectral characteristic measurement, etc.
Active Publication Date: 2017-12-19
NIPPON PAINT CHINA
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[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
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[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] serial number
[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.
[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...
[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 invention provides a test method for rapidly determining the yellowing property of a gypsummortar. Specifically the method is a soaking method, and comprises: (a) taking n cementmortar blocks, filling the casting parts of n hard casting frames with a gypsummortar sample to be tested, placing on the cement mortar blocks, and compacting and flattening the surface by using a scraping cutter; placing in a standard test environment, curing, brushing with an interior wall cover type prime coat, horizontally placing the specimen the standard sand at the bottom portion of a water tank, injecting water, and standing, wherein the standard sand meet GB / T 17671; and respectively observing whether the prime coat surface is subjected to yellowing and color changing at t1, t2, ..., and tm, taking pictures, and calculating the yellowing area percentage X.
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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