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Preparation method of 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. It is beneficial to automated mass industrial production and production. The process is easy to control and the effect of fire resistance is good

Inactive Publication Date: 2017-01-11
王尧尧
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem of this method is that generally only low-strength concrete products can be obtained, which cannot be used as load-bearing structures. Although some improved methods can increase the strength of the original concrete to a certain extent, the range is limited, and it is difficult to obtain products with higher strength. It is also difficult to meet the requirements of energy saving
In theory, this method can alleviate the contradiction between strength and thermal conductivity to a certain extent, but in actual practice, the improvement effect is not very obvious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Take 4.0kg of aluminum sol with a concentration of 40% and dissolve it in 50.0kg of water to prepare diluted aluminum sol and let it stand for 2 days to obtain translucent thixotropic alumina colloid. The premix is ​​ball milled and mixed according to the following proportions: 54kg of alumina colloid, 0.1kg of polyester fiber, and 0.1kg of waterproofing agent. Then add 40.0kg of Portland cement to the premix and mix it in a mixer. The viscous paste obtained is poured into the abrasive tool and steamed at 90°C for 6 hours to obtain a nanoporous concrete block with a density of 1360kg / m3 and a strength of 14MPa. The thermal conductivity is 0.17w / m·k.

Embodiment 2

[0039] Dissolve 5.0kg of 30% silica sol in 30.0kg of water to prepare diluted silica sol, and dissolve 4.0kg of 40% aluminum sol in 45.0kg of water to prepare diluted alumina sol. The diluted aluminum sol is placed in a container, and the diluted silica sol is slowly added under stirring at 700 r / min to obtain a translucent thixotropic silica-alumina colloid. The premix was prepared 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, mix and stir, pour the resulting slurry into the mold, and after 28 days of natural curing, get a nanoporous concrete plate 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 / min for 3 hours to obtain a viscous pre-sheared silicone gel-polyvinyl alcohol thixotropic colloid. The premix is ​​ball-milled according to the following proportions: viscous pre-shear silicone gel-polyvinyl alcohol thixotropic colloid 50.0kg, carbon fiber 1.0kg, waterproofing agent 0.1kg. Then add 10.0 kg of Portland cement to the premix, mix and stir, and pour the resulting slurry into the mold. After curing the film for 28 days, a nanoporous concrete mortar with a density of 230 kg / m3 and a thermal conductivity of 0.054 w / m·k is obtained.

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Abstract

The invention relates to a preparation method of fiber-reinforced nano-porous concrete. The preparation method comprises the following steps: (1) premixture preparation; (2) premixture and cement mixing; and (3) compression molding. The fiber-reinforced nano-porous concrete prepared by the preparation method is of a three-dimensional network microcellular structure, the strength of the concrete can reach 0.2 to 50 MPa, the concrete is free of cracking or chalking, and the concrete can serve as a wall body thermal insulation material and can also serve as an integrally functional wall body for weight bearing and thermal insulation. The fiber-reinforced nano-porous concrete is a pure inorganic material, and is good in fireproof performance, environment-friendly, free of pollution and high in durability; and the service life of the concrete is the same as that of a building. According to the fiber-reinforced nano-porous concrete prepared by the preparation method, due to the fact that the interior is of the nano-porous structure, the concrete has preferable sound insulation and sound absorption performance, and the concrete can also serve as a sound insulation and sound absorption material; and the concrete has greater adsorption capacity, and can also serve as a water treatment and air purification material.

Description

technical field [0001] The invention relates to a preparation method of porous concrete, in particular to a preparation method of fiber-reinforced nano-porous concrete, which belongs to the field of building materials. Background technique [0002] At present, there are three main ways to prepare porous concrete: 1) Adding porous materials during the concrete preparation process. 2) Introduce foaming or air entrainment process in the concrete preparation process. 3) Add porous material and air-entraining or foaming process at the same time in the concrete preparation process. There are still some problems in the above preparation method. 1) Porous materials are added during the traditional concrete preparation process. Theoretically, the required strength, density and thermal conductivity can be obtained by controlling the type and proportion of porous materials. In actual operation, porous materials are often of low density and easy to break, and it is not suitable to fo...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B28/06C04B38/00C04B16/06C04B14/42C04B14/38C04B111/28C04B111/52
CPCC04B28/04C04B28/06C04B2111/28C04B2111/52C04B2201/20C04B2201/32C04B2201/50C04B22/06C04B16/0683C04B2103/65C04B38/0045C04B40/024C04B14/42C04B2103/0068C04B14/062C04B24/2623C04B14/386
Inventor 王尧尧
Owner 王尧尧
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