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Method for reducing water absorption rate of aerated concrete

A technology of air-entrained concrete and water absorption rate, applied in the field of building materials, can solve the problems of weaker pore blocking effect in deeper layers, reduce the water absorption rate of air-entrained concrete, and affect the cutting effect of air-entrained concrete, and achieve excellent mechanical properties and volume stability. , Improve the effect of high shrinkage and reduced water absorption

Active Publication Date: 2020-04-07
HOHAI UNIV
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  • Application Information

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Problems solved by technology

[0003] Patent CN 106747168A greatly reduces the water absorption of air-entrained concrete by adding a water-repellent agent composed of siloxane, calcium stearate and potassium methyl silicate in a mass ratio of 2 to 6:1:1, and its 48h mass The water absorption rate is reduced from 68.5% to around 2%, and the strength level is increased by about 15% relative to the comparison ratio, and the thermal conductivity is reduced by 5%, but its hydrophobic effect only acts on the surface of the inner hole wall of the air-entrained concrete. The blocking effect of the deeper pores is not strong; the patent CN107285669A adds the aerated concrete slurry by adding the surface hydrophobic coating of the crystal waste powder to the aerated concrete slurry, which improves the water permeability of the aerated concrete block and reduces the water absorption rate, but its Hydrophobic crystal waste powder only reduces the water absorption of aerated concrete through physical hydrophobic properties and does not reduce the capillary pores by changing the structure of hydration products, so the degree of reduction in water absorption is limited; patent CN105384397A seals cellulose by acetylating banana fibers free hydroxyl groups in the middle, so as to improve the hydrophobicity and thermal stability of the material, and increase the moisture resistance of the aerated concrete block by adding petroleum asphalt and silicon acrylic emulsion, but in the industrial production process of aerated concrete, steel wire is generally used Cut and shape the air-entrained concrete after the initial setting, adding too much fiber will affect the cutting of the air-entrained concrete

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  • Method for reducing water absorption rate of aerated concrete

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Experimental program
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Embodiment 1

[0029] This embodiment is used to make B05 ordinary sand aerated concrete

[0030] 1-i Preparation of blank air-entrained concrete sample B1

[0031] Get the following proportioning ratio of each raw material component by weight and stir evenly to obtain silicate material slurry: 90 parts of cement, 90 parts of lime, 280 parts of ground quartz sand, 0.69 part of aluminum powder, 0.07 part of triterpene saponin, water material Ratio of 0.7, the effective calcium oxide content in lime is 80%.

[0032] Stir the slurry evenly, pour it into the mold and move it into a constant temperature curing box at 50°C for 5 hours of curing, scrape off the bread head and continue curing for 12 hours, then remove the mold, and finally put the test block into a 1.1MPa, 180°C autoclave for curing After 8 hours, the test block was cooled to room temperature to obtain air-entrained concrete B1.

[0033] 1-ii Preparation of air-entrained concrete B2 mixed with modifier

[0034] (1) Take the follo...

Embodiment 2

[0068] This embodiment is used to make B06 ordinary sand aerated concrete

[0069] 2-i Preparation of blank air-entrained concrete sample H1

[0070] Get the following proportioning ratio of each raw material component by weight and stir evenly to obtain silicate material slurry: 90 parts of cement, 90 parts of lime, 360 parts of ground quartz sand, 0.55 part of aluminum powder, 0.07 part of triterpene saponin, water material Ratio of 0.63, the effective calcium oxide content in lime is 80%.

[0071] Stir the slurry evenly, pour it into the mold and move it into a constant temperature curing box at 50°C for 5 hours of curing, scrape off the bread head and continue curing for 12 hours, then remove the mold, and finally put the test block into a 1.1MPa, 180°C autoclave for curing After 8 hours, the test block was cooled to room temperature to obtain air-entrained concrete H1.

[0072] 2-ii Preparation of air-entrained concrete H2 mixed with modifier

[0073] (1) Take the foll...

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Abstract

The invention discloses a method for reducing the water absorption rate of aerated concrete, which specifically comprises the following steps: adding 2-4kg of a modifier into per cubic meter of aerated concrete in the preparation process of an aerated concrete slurry, and further spraying a post-treatment agent on the surface of an aerated concrete product after hydrothermal synthesis is finished.According to the method, the connectivity of capillary pores and air pores in the aerated concrete can be blocked, so that the water absorption rate of the aerated concrete is remarkably reduced, andaerated concrete products are endowed with excellent mechanical properties and volume stability.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for reducing the water absorption of aerated concrete. Background technique [0002] Due to its light weight, low thermal conductivity, good fire resistance, and non-sintered production, aerated concrete is the basic wall material to meet the needs of building industrialization and building energy conservation. This type of material uses calcium silicate hydrate gel C-S-H(I) with a low calcium-to-silicon ratio and tobermullite crystals as the main gelling substances. The special hydration product system and porous characteristics endow it with light weight, heat preservation, Excellent engineering application performance such as heat insulation and fire prevention, and common problems of high porosity, high water absorption, high shrinkage, and easy cracking of the wall. [0003] Patent CN 106747168A greatly reduces the water absorption of air-ent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/30C04B41/61C04B28/00C04B38/02
CPCC04B28/00C04B38/02C04B40/0039C04B41/4543C04B41/61C04B2201/20C04B2201/50C04B2103/302C04B24/122C04B24/124C04B24/12C04B24/305C04B22/14C04B24/20C04B22/002C04B22/064C04B14/06C04B22/04C04B24/10
Inventor 蒋亚清王玉吉旭平黄鹤许文祥
Owner HOHAI UNIV