Aerated concrete block prepared from single calcium material and preparation method of aerated concrete block

A technology of aerated concrete and calcium materials, applied in the field of building materials, can solve the problems of cutting and turning cracks, rising prices, and brittle products, etc., and achieve the effects of reducing electricity pressure, reducing production costs, and improving product quality

Inactive Publication Date: 2018-11-20

GANSU CONSTR INVESTMENT BUILDING MATERIALS

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AI-Extracted Technical Summary

Problems solved by technology

At present, the existing aerated concrete block manufacturers mainly produce two types of aerated blocks: cement-lime-fly ash and cement-lime-quartz sand. However, as lime resources become increasingly tense, prices continue to rise , poor quality and other problems, it is imminent to replace lime with cement to produce aera...

Abstract

The invention relates to an aerated concrete block prepared from a single calcium material and a preparation method of the aerated concrete block. The aerated concrete block is prepared from raw materials in percentage by weight as follows: 80%-82% of quartz sand, 10%-16% of cement, 2%-5% of flue gas desulfurization gypsum, 0.04%-0.05% of aluminum paste, 0.02%-0.03% of an admixture and the balanceof waste. According to the aerated concrete block prepared from the single calcium material cement, product quality is improved greatly while comprehensive utilization of resources is realized, production cost is reduced, the environmental requirements are met, the product is good in appearance quality, and the aerated concrete block integrates high quality, energy saving and waste using.

Application Domain

Ceramicware

Technology Topic

GypsumFlue-gas desulfurization +6

Examples

Experimental program(3)

Example Embodiment

[0021] Example 1

[0022] An aerated concrete block produced from a single calcareous material. It is made of the following weight percentages of raw materials, 80% quartz sand, 16% cement, 3% desulfurized gypsum, 0.04% aluminum paste, and 0.02% admixture. The remainder is waste, which is leftovers produced by cutting during the production of autoclaved aerated concrete blocks. GT-717 special foam stabilizer for aerated concrete is a special compound liquid for aerated concrete produced by Jiangshan Tianshun Building Materials Co., Ltd. GT-717.

[0023] The preparation method of the aerated concrete block produced from the above single calcareous material includes the following steps:

[0024] Step (1), the quartz sand slurry is ball milled, and the fineness is controlled to be less than or equal to 45% on the 0.08mm square hole sieve;

[0025] Step (2), add water and stir the ball-milled quartz mortar in step (1), adjust the dispersion of the slurry to control it at 38cm, and measure the dosage according to the formula described in claim 1 after stirring, and use the steam heating system to measure The slurry is heated and the temperature is controlled at 50°C, which provides favorable conditions for the aluminum powder to generate gas;

[0026] Step (3). Mix cement, desulfurized gypsum and the slurry described in step (2) according to the formula dosage of claim 1, and the mixing time is 1 min;

[0027] Step (4), add an admixture to the mixed slurry in step (3), stir for 40s and then pour, and thicken at 20°C indoor environment after pouring for 2h;

[0028] Step (5), after the thickening is finished, demoulding and cutting are carried out, and the blanks of the required specifications and dimensions are cut, and the cut blanks are pushed to the pre-curing room for curing, and the whole kettle is cut and moved to the autoclave Carry out steam curing. Before heating up, vacuum for 30min in advance to make the vacuum degree in the kettle reach -0.04MPa, then heat up for 2h to make the steam pressure reach 1.0MPa, the temperature reach 175℃, keep constant temperature and pressure for 7h, and finally discharge within 2h Air cooling

[0029] In step (6), the green body after being discharged from the autoclave undergoes appearance inspection, and the qualified product is the finished product. Its bulk density is 590Kg/m3 and compressive strength is 3.9MPa, which meets the requirements of the national standard GB11968-2006 for the bulk density and compressive strength of B06 grade products (bulk density≤625Kg/m3, compressive strength≥3.5MPa).

Example Embodiment

[0030] Example 2

[0031] An aerated concrete block produced from a single calcareous material, which is made of the following weight percentages of raw materials, 80% quartz sand, 14% cement, 5% desulfurized gypsum, 0.04% aluminum paste, and 0.02% admixture. The remainder is waste, which is leftovers produced by cutting during the production of autoclaved aerated concrete blocks. GT-717 special foam stabilizer for aerated concrete is a special compound liquid for aerated concrete produced by Jiangshan Tianshun Building Materials Co., Ltd. GT-717.

[0032] The preparation method of the aerated concrete block produced from the above single calcareous material includes the following steps:

[0033] Step (1), the quartz sand slurry is ball milled, and the fineness is controlled to be less than or equal to 45% on the 0.08mm square hole sieve;

[0034] Step (2), add water to stir the ball-milled quartz mortar in step (1), adjust the dispersion of the slurry to control it at 39cm, and measure the dosage according to the formula described in claim 1 after stirring, and use the steam heating system to measure The slurry is heated and the temperature is controlled at 53°C, which provides favorable conditions for the aluminum powder to generate gas;

[0035] Step (3). Mix cement, desulfurized gypsum and the slurry described in step (2) according to the formula dosage of claim 1, and the mixing time is 1.5 min;

[0036] Step (4), add an admixture to the mixed slurry in step (3), stir for 45s and then pour, after pouring, thicken in an indoor environment at 25°C for 2.5h;

[0037] Step (5), after the thickening is finished, demoulding and cutting are carried out, and the blanks of the required specifications and dimensions are cut, and the cut blanks are pushed to the pre-curing room for curing, and the whole kettle is cut and moved to the autoclave Carry out steam curing. Before heating up, vacuum for 35min in advance to keep the vacuum degree in the kettle at -0.04MPa, then heat up for 2h to make the steam pressure reach 1.0MPa, the temperature reach 185℃, keep constant temperature and pressure for 7.5h, and finally at 2h Internal exhaust cooling;

[0038] In step (6), the green body after being discharged from the autoclave undergoes appearance inspection, and the qualified product is the finished product. Its bulk density is 595Kg/m3 and compressive strength is 4.1MPa, which meets the requirements of the national standard GB11968-2006 for the bulk density and compressive strength of B06 grade products (bulk density≤625Kg/m3, compressive strength≥3.5MPa). Desulfurized gypsum plays an important role in the compressive strength of aerated concrete blocks with a single calcareous material sand.

Example Embodiment

[0039] Example 3

[0040] An aerated concrete block produced from a single calcareous material, which is made of the following weight percentages of raw materials, 80% quartz sand, 15% cement, 4% desulfurized gypsum, 0.04% aluminum paste, 0.03% admixture, The remainder is waste, which is leftovers produced by cutting during the production of autoclaved aerated concrete blocks. GT-717 special foam stabilizer for aerated concrete is a special compound liquid for aerated concrete produced by Jiangshan Tianshun Building Materials Co., Ltd. GT-717.

[0041] The preparation method of the aerated concrete block produced from the above single calcareous material includes the following steps:

[0042] Step (1), the quartz sand slurry is ball milled, and the fineness is controlled to be less than or equal to 45% on the 0.08mm square hole sieve;

[0043] Step (2), add water and stir the ball-milled quartz mortar in step (1), adjust the dispersion of the slurry to control it at 40cm, and measure the dosage according to the formula described in claim 1 after stirring, and use the steam heating system to measure The slurry is heated and the temperature is controlled at 55°C, which provides favorable conditions for the aluminum powder to generate gas;

[0044] Step (3), mixing cement, desulfurized gypsum and the slurry described in step (2) according to the formula dosage of claim 1, and the mixing time is 2 minutes;

[0045] Step (4), add an admixture to the mixed slurry in step (3), stir for 40-50s and then pour, and thicken at 30°C indoor environment after pouring for 3h;

[0046] Step (5), after the thickening is finished, demoulding and cutting are carried out, and the blanks of the required specifications and dimensions are cut, and the cut blanks are pushed to the pre-curing room for curing, and the whole kettle is cut and moved to the autoclave Carry out steam curing. Before heating up, vacuum for 40min in advance to keep the vacuum in the kettle at 0.05MPa, then heat up for 2h to make the steam pressure reach 1.1MPa, the temperature reach 190℃, keep constant temperature and pressure for 8h, and finally discharge within 2h Air cooling

[0047] In step (6), the green body after being discharged from the autoclave undergoes appearance inspection, and the qualified product is the finished product. Its bulk density is 593Kg/m3 and compressive strength is 4.3MPa, which meets the requirements of the national standard GB11968-2006 for the bulk density and compressive strength of B06 grade products (bulk density≤625Kg/m3, compressive strength≥3.5MPa). The addition of 0.01% of the admixture can increase the compressive strength of aerated concrete blocks with a single calcareous material sand by 0.3-0.5MPa.

PUM

Property	Measurement	Unit
Density	590.0	kg/m³
Compressive strength	3.9	mPa
Density	<= 625.0	kg/m³

Description & Claims & Application Information

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