Low-density aerated concrete product and preparation method thereof

An air-entrained concrete, low-density technology, applied in the field of building materials, can solve the problems of hidden dangers of the environment and safety, low comprehensive utilization rate of output, etc., and achieve the effects of reducing the breakage rate, improving the appearance quality, and improving the pouring stability.

Inactive Publication Date: 2013-05-22

山东高阳建材有限公司

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The existing domestic iron ore tailings have become the bulk solid waste with the largest industrial output and the...

Abstract

The invention discloses a low-density aerated concrete product and a preparation method thereof, and belongs to the technical field of building materials. The preparation method adopting quartz micro powder and iron core tailing, which are respectively 25%-35% and 30%-40% of a dry material, as the primary materials comprises the following steps of: adding cement and lime for cementing; initiating by aluminum powder; and adjusting the component proportion and the steam-curing environment to prepare a light high-strength aerated concrete product with desiccated bulk density of 300kg/m<3>-525kg/m<3> and absolute-dry compressive strength of 2.0 MPa-3.0 MPa. According to the preparation method disclosed by the invention, low-carbon, environment-friendly and energy-saving production concept is adopted, and the quartz micro powder and iron ore tailing, which are discarded after quartz sand ore-dressing, are adopted as the primary materials for producing the low-density autoclaved aerated concrete product as the wall self-insulation material.

Application Domain

Ceramicware

Technology Topic

AluminiumQuartz +11

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Examples

Experimental program(1)

Example Embodiment

[0024] Hereinafter, a low-density aerated concrete product of the present invention and its preparation method will be further illustrated by specific examples, among which Example 1 is the best example.

[0025] (1) Use the raw materials in parts by weight described in the examples in Table 1, in which lime is medium-speed digestion lime, the effective CaO content is not less than 75%, and MgO <5%, digestion time is 10~15min, digestion temperature is 65~80℃, after crushing, it will be stored in the cylindrical warehouse, and then it will enter the ball mill for grinding and use. Cement is stored in the batching warehouse for later use. Lime and cement are fed into the electronic weighing scale from the feeder for measurement. Iron tailings, fine quartz powder and gypsum mixed with a proper amount of water to mix abrasives to make the material fineness reach 200 mesh sieve residue 8%, 200 mesh sieve residue 12%, and 200 mesh sieve residue 4%, to prepare a slurry of suitable concentration. The slurry pump is sent to the electronic metering scale for internal metering. After the aluminum powder is measured by the electronic weighing scale, it is stirred to make the aluminum powder uniformly dispersed.

[0026] (2) Weigh the dry ingredients in Table 1 and mix them evenly. Then add water according to the total weight ratio of water and dry ingredients of 0.65~0.72; add stabilizer which accounts for 4~12‰ of water volume and stir for 90~ After 150s, add aluminum powder with a total weight of 0.5~0.6‰ of the dry material, and stir for 30~50s to obtain a uniformly mixed slurry. In the mixing process, heat insulation measures are set to ensure that the entering temperature of the slurry is 45~50℃ when pouring. ;

[0027] (3) Pour the uniformly stirred slurry in step 2, after statically stopping gas generation, pre-curing, and cutting, put it into an autoclave for high-temperature autoclave to obtain a finished product of autoclaved aerated concrete; The time for stopping gas and pre-curing is 3.5~4.5h, and the temperature of pre-curing is 50~60℃; the autoclave conditions are: pressure control at 1.2~1.3MPa, temperature control at 180~200℃, constant temperature and pressure 6~8h .

[0028] Table 1: The raw material ingredient list of the autoclaved aerated concrete products of Examples 1-9 (weight parts kg/m 3 )

[0029]

[0030] The mud content of the iron tailings and fine quartz powder described in Examples 1-9 is less than 8%.

[0031] Table 2: Through the implementation of the formulas listed in 1~3, the production process is manufactured, and the product inspection results are as follows:

[0032]

[0033] The above inspection results meet the national standards of GB11968-2006.

[0034] Table 3: Through the implementation of the formulas in columns 4~6, the production process is manufactured, and the product inspection results are as follows:

[0035]

[0036] The above inspection results meet the national standards of GB11968-2006.

[0037] Table 4: Through the implementation of the formulas listed in columns 7-9, the production process flow is manufactured, and the product inspection results are as follows:

[0038]

[0039] The above inspection results meet the national standards of GB11968-2006.

[0040] In each embodiment of the present invention, two wastes of iron ore tailings and fine quartz powder are mainly used to prepare low-density aerated concrete whose strength is higher than the requirements of the national standard, and the dry bulk density is combined with the requirements of the national standard. The ratio of best embodiment 1 is the most The best formula is only 300kg/m in dry bulk density. 3 , Low-density aerated concrete whose compressive strength meets national standards. The method and product of the invention can achieve good economic and social benefits.

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Classification and recommendation of technical efficacy words

Good thermal insulation effect

Low-density aerated concrete product and preparation method thereof

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

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Description & Claims & Application Information

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