Method for improving performance of gypsum powder
A technology of gypsum powder and gypsum, applied in the field of gypsum application, can solve the problems of low strength and poor water resistance, and achieve the effects of increasing the density, optimizing the crystal structure, and improving the compressive strength
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Embodiment 1
[0009] Example 1. In this example, the common construction gypsum powder in this industry is taken as an example. β-type construction gypsum is selected, and 0.03% polycarboxylate water-reducer mother liquor is selected, and 0.03% polycarboxylate water-reducer mother liquor is directly added In the dry gypsum powder, a mixer is used as the coating equipment in this example, and the gypsum powder with a good ratio is sent into the mixer for more than 10 minutes. According to practice, the gypsum powder made by this method is mixed with water according to the national standard 180 consistency. After 28 days, the compressive strength of the test block or product can reach more than 20MPa; the amount of water added can be reduced from 1:0.7 to 1:0.5, and the compressive strength can be increased by more than 1 times in 2 hours according to the building gypsum standard
Embodiment 2
[0010] Embodiment 2. In this example, the common building gypsum powder in this industry is taken as an example. Mixed-phase building gypsum is selected, wherein the mixed-phase gypsum is composed of hemihydrate gypsum, anhydrous type II gypsum, anhydrous type III gypsum, and dihydrate gypsum. Among them, 50% hemihydrate gypsum, 25% anhydrous type II, 10% anhydrous type III, and 5% dihydrate gypsum. Select 0.03% polycarboxylate superplasticizer mother liquor, and add 0.05% polycarboxylate superplasticizer mother liquor directly into the dry gypsum powder. In this example, a needle pulverizer is used as the coating equipment, and it is sent to a needle mill for Grind for more than 10 minutes. According to practice, the gypsum powder made by this method can reach more than 30MPa in 28 days after the gypsum powder made by this method is mixed with water according to the national standard 180 consistency. reduced to 1:0.4,
Embodiment 3
[0011] Embodiment 3. In this example, the common construction gypsum powder in this industry is taken as an example, and mixed-phase construction gypsum is selected, wherein the mixed-phase gypsum is composed of hemihydrate gypsum, anhydrous type II gypsum, anhydrous type III gypsum, and dihydrate gypsum. Among them, hemihydrate gypsum is 60%, anhydrous type II is 25%, anhydrous type III is 5%, and dihydrate gypsum is 3%. Select 0.08% polycarboxylate superplasticizer mother liquor, and add 0.08% polycarboxylate superplasticizer mother liquor directly into the dry gypsum powder. In this example, a ball mill is used as the coating equipment, and it is sent into the ball mill for grinding for 10 minutes As mentioned above, according to practice, the gypsum powder made by this method can reach more than 40MPa in 28 days after the gypsum powder made by this method is mixed with water according to the national standard 180 consistency; the water-powder ratio can be reduced from 1:0.7...
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