A load-bearing thermal insulation concrete with ettringite colloid as template agent and preparation method thereof
A technology of ettringite colloid and thermal insulation concrete, which is applied in the direction of solid waste management, sustainable waste treatment, climate sustainability, etc., can solve problems such as poor thermal insulation effect, achieve high compatibility, good colloidal properties, and avoid shrinkage Effect
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Embodiment 1
[0076] Dissolve 6.0kg of aluminum sulfate in 20.0kg of water to prepare an aluminum sulfate solution, and dissolve 2.2kg of quicklime in 20.0kg of water to prepare lime water. Put the lime water in the container, slowly add the aluminum sulfate solution under the condition of stirring at 200r / min until the pH value is 7.0, and obtain the translucent ettringite colloid. The premixed dry material is prepared and mixed as follows: Portland cement 35.0kg, fine sand 38.0kg, vitrified microspheres 8.0kg, clay ceramsite 15.0kg, zeolite powder 1.0kg. Add 0.5 kg of polypropylene fiber and 0.1 kg of shrinkage reducer to the prepared ettringite colloid, and stir for 3 minutes to obtain a premixed wet material. Then add the premixed dry ingredients and continue to stir for 5 minutes. The resulting concrete slurry is poured into molds to make bricks. After 28 days of natural curing, the dry density of the obtained sample is 1070kg / m 3 , strength 18MPa, thermal conductivity 0.18w / m·k.
Embodiment 2
[0078] Dissolve 6.5kg of aluminum sulfate in 20.0kg of water to prepare an aluminum sulfate solution, and dissolve 2.3kg of quicklime in 20.0kg of water to prepare lime water. Put the lime water in the container, slowly add the aluminum sulfate solution under the condition of stirring at 500r / min until the pH value is 7.2, and obtain the translucent ettringite colloid. The premixed dry material is prepared and mixed as follows: Portland cement 40.0kg, fine sand 50.0kg, vitrified microbeads 8.0kg, pebbles 40.0kg, shale ceramsite 20.0kg, silicon micropowder 1.2kg. Add 1.0 kg of glass fiber and 0.1 kg of waterproofing agent to the prepared ettringite colloid, and stir for 5 minutes to obtain a premixed wet material. Then add the premixed dry ingredients and continue to stir for 8 minutes. The resulting concrete slurry is poured into molds to form panels. After soaking in water for 28 days, the dry density of the obtained sample is 1310kg / m 3 , strength 25MPa, thermal conductiv...
Embodiment 3
[0080] Dissolve 4.0kg of aluminum sulfate in 20.0kg of water to prepare an aluminum sulfate solution, and dissolve 1.4kg of quicklime in 20.0kg of water to prepare lime water. Put the aluminum sulfate solution in the container, and slowly add lime water while stirring at 1150r / min, until the pH value is 7.5, and the translucent ettringite colloid is obtained. The premixed dry material is prepared and mixed as follows: 12.0kg of sulphoaluminate cement, 20.0kg of fine sand, 15.0kg of expanded pearl, 15.0kg of shale ceramsite, and 0.8kg of silica fume. Add 1.0 kg of brucite fiber and 0.1 kg of retarder to the prepared ettringite colloid, and stir for 6 minutes to obtain a premixed wet material. Then add the premixed dry ingredients and continue to stir for 4 minutes. The resulting concrete slurry is poured into molds to make special-shaped components. After 14 days of natural curing, the dry density of the obtained sample is 950kg / m 3 , strength 15MPa, thermal conductivity 0.1...
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