A method for low-temperature solidification of waste gypsum into high-strength building materials
A building material, high-strength technology, applied in the field of new high-strength building materials, can solve problems such as environmental pollution, and achieve the effects of solving pollution, low energy consumption, and high utilization rate
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Embodiment 1
[0024] Take waste gypsum, ground construction sand, cement, and fly ash as raw materials, and take 50% waste gypsum, 20% construction sand and gravel, 15% cement, 5% fly ash, and 10% water according to the quality. After the raw materials are fully pulverized and stirred, they are pressed and molded by the FW-4 tablet press to obtain a green body. The sample shape is a rectangular block with a length of about 40 mm, a width of about 15 mm, and a thickness of about 5 mm. The molding pressure is 30 MPa; the formed green body is transferred To the airtight hydrothermal reactor, add a certain volume of water to the reactor, the specific addition amount is 15% of the volume of the reactor, and then heat treatment, the heating temperature is 200 ℃, the time is 8 hours; the sample after the treatment is taken out Place it in an oven at 80°C and dry for 24 hours to obtain a cured product. The three-point method was used to test the flexural strength, and the results showed that the fle...
Embodiment 2
[0026] Take waste gypsum, ground construction sand, cement, and fly ash as raw materials, and take 40% waste gypsum, 20% construction sand and gravel, 20% cement, 10% fly ash, and 10% water according to the quality. After the raw materials are fully pulverized and stirred, they are pressed and molded by the FW-4 tablet press to obtain a green body. The sample shape is a rectangular block with a length of about 40mm, a width of about 15mm, and a thickness of about 5mm. The molding pressure is 20MPa; the formed green body is transferred Add a certain volume of water to the airtight reaction kettle, the specific addition amount is 15% of the volume of the reaction kettle, then heat treatment, the heating temperature is 160℃, the time is 16h; the sample after the treatment is taken out and placed The cured product can be obtained by drying in an oven at 80°C for 24 hours. The three-point method was used to test the flexural strength, and the results showed that the flexural strengt...
Embodiment 3
[0028] Using waste gypsum, ground construction sand, cement, and fly ash as raw materials, 60% waste gypsum, 10% construction sand and gravel, 12% cement, 8% fly ash, and 10% water are taken as raw materials. After the raw materials are fully pulverized and stirred, they are pressed and molded by the FW-4 tablet press to obtain a green body. The sample shape is a rectangular block with a length of about 40 mm, a width of about 15 mm, and a thickness of about 5 mm. The molding pressure is 30 MPa; the formed green body is transferred Add a certain volume of water to the airtight reaction kettle, the specific addition amount is 15% of the volume of the reaction kettle, and then heat treatment, the heating temperature is 120 ℃, the time is 24h; the sample after the treatment is taken out and placed The cured product can be obtained by drying in an oven at 80°C for 24 hours. The three-point method was used to test the flexural strength, and the results showed that the flexural stren...
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