Fiber reinforced nano-porous concrete
A nano-porous, fiber-reinforced technology, applied in the field of building materials, can solve the problems that it is difficult to obtain products with high strength, the improvement effect is not obvious, and it cannot be used as a load-bearing structure, so as to achieve easy control of the production process, good fire resistance, The effect of high durability
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Embodiment 1
[0037] Dissolve 4.0 kg of aluminum sol with a concentration of 40% in 50.0 kg of water to prepare a diluted aluminum sol, and let it stand for 2 days to obtain a translucent thixotropic alumina colloid. The premix is mixed by ball milling according to the following proportions: 54kg of alumina colloid, 0.1kg of polyester fiber, and 0.1kg of waterproofing agent. Then, 40.0kg of Portland cement was added to the premix and mixed and stirred in a mixer. The obtained viscous paste was injected into the abrasive tool, and steam cured at 90°C for 6h to obtain nano-porous concrete blocks with a density of 1360kg / m3 and a strength of 14MPa. Thermal conductivity 0.17w / m·k.
Embodiment 2
[0039] Dissolve 5.0kg of silica sol with a concentration of 30% in 30.0kg of water to prepare a diluted silica sol, and take 4.0kg of aluminum sol with a concentration of 40% and dissolve it in 45.0kg of water to prepare a diluted aluminum sol. The diluted alumina sol was placed in a container, and the diluted silica sol was slowly added under stirring at 700 r / min to obtain a translucent thixotropic silica-alumina colloid. The premix was formulated and ball-milled as follows: 75.0 kg of silica-alumina colloid, 1.0 kg of glass fiber and 0.1 kg of shrinkage reducer. Then add 30.0kg of aluminate cement to the premix and mix and stir, the obtained slurry is poured into the mold, and after natural curing for 28d, a nano-porous concrete plate is obtained, with a density of 1480kg / m3, a strength of 15MPa, and a thermal conductivity of 0.19w / m·k .
Embodiment 3
[0041] Take 10.0kg of pre-sheared silicone gel and 0.1kg of polyvinyl alcohol, add 40.0kg of water, soak for 24 hours, and then shear and disperse at a speed of 2600r / mim for 3 hours to obtain viscous pre-sheared silicone gel-polyvinyl alcohol thixotropy colloid. The premix is mixed by ball milling in the following proportions: 50.0 kg of viscous pre-sheared silicone gel-polyvinyl alcohol thixotropic colloid, 1.0 kg of carbon fiber, and 0.1 kg of water repellant. Then, 10.0kg of Portland cement was added to the premix, mixed and stirred, and the obtained slurry was poured into the mold. After the film was cured for 28 days, a nanoporous concrete mortar was obtained with a density of 230kg / m3 and a thermal conductivity of 0.054w / m·k.
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