CN113800841A - Lime-free aerated concrete product and production method thereof - Google Patents
Lime-free aerated concrete product and production method thereof Download PDFInfo
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- CN113800841A CN113800841A CN202111102956.9A CN202111102956A CN113800841A CN 113800841 A CN113800841 A CN 113800841A CN 202111102956 A CN202111102956 A CN 202111102956A CN 113800841 A CN113800841 A CN 113800841A
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- lime
- concrete product
- aerated concrete
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 26
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 26
- 239000004571 lime Substances 0.000 claims abstract description 26
- 239000002002 slurry Substances 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000004568 cement Substances 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 16
- 238000003756 stirring Methods 0.000 claims abstract description 16
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 13
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000000292 calcium oxide Substances 0.000 claims abstract description 13
- 238000005520 cutting process Methods 0.000 claims abstract description 11
- 239000004088 foaming agent Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 239000012257 stirred material Substances 0.000 claims abstract description 4
- 239000000047 product Substances 0.000 claims description 39
- 239000002699 waste material Substances 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 238000001354 calcination Methods 0.000 claims description 4
- 239000012467 final product Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 2
- 210000001161 mammalian embryo Anatomy 0.000 description 5
- 239000006004 Quartz sand Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000005587 bubbling Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000000227 grinding Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/10—Compositions or ingredients thereof characterised by the absence or the very low content of a specific material
- C04B2111/1031—Lime-free or very low lime-content materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention discloses a method for producing an aerated concrete product without lime, which comprises the following steps: mixing and stirring the slurry and cement containing free calcium oxide, and selectively adding water in the stirring process; adding foaming agent and stirring again; pouring the mixed and stirred materials; standing and maintaining the poured material to obtain a molded blank; and when the formed blank reaches the cutting hardness, cutting the blank to obtain the cut concrete product. Compared with the existing concrete product produced by lime, the invention has better appearance size, higher density and strength, reduces the dependence on lime materials and can improve the production efficiency.
Description
Technical Field
The invention relates to the technical field of aerated concrete, in particular to a lime-free aerated concrete product and a production method thereof.
Background
At present, with more and more domestic aerated concrete production lines, the price of raw materials is continuously increased, lime is used as one of main cementing materials of aerated concrete products, the lime is in a monopoly state, the price is greatly increased, the quality is often unstable, great difficulty is brought to quality control of production of aerated concrete blocks and ALC plates, the production cost is greatly increased, the monopoly condition of the lime can be broken through by adopting a process of producing the aerated concrete products by replacing the lime with special cement, the raw materials are stable, the production quality can be stabilized, and the production cost is reduced.
Disclosure of Invention
The invention provides a lime-free aerated concrete product and a production method thereof, aiming at solving the technical problems that: the function of lime in aerated concrete products is replaced, so that the problem of difficulty in control in the production process due to unstable quality of lime is avoided, and the stability of the quality of the products is ensured.
In view of the above problems of the prior art, according to one aspect of the present disclosure, the following technical solutions are adopted in the present invention:
a method of producing an aerated concrete product without lime comprising:
step S1: mixing and stirring the slurry and cement containing free calcium oxide, and optionally adding water according to the thickening degree of the slurry;
step S2: adding foaming agent and stirring again;
step S3: pouring the mixed and stirred materials;
step S4: standing and maintaining the poured material to obtain a molded blank;
step S5: and when the formed blank reaches the cutting hardness, cutting the blank to obtain the cut concrete product.
In order to better realize the invention, the further technical scheme is as follows:
further, the cement contains 25-28% of free calcium oxide by mass ratio.
Further, the free calcium oxide is obtained by lowering the calcination temperature.
Further, the mass ratio of the cement content is 28-33% without calculating water.
Further, the foaming agent is aluminum powder.
Further, the casting temperature of the step S3 is 46-49 ℃.
Further, still include:
step S6: and (5) carrying out autoclaved curing on the cut concrete product to obtain a final product.
Further, in the case where water is not calculated, 20 to 25% by mass of waste slurry is also added in step S1.
Further, the mass ratio of the slurry content in step S1 is 47-50% without calculating water.
The invention can also be:
an aerated concrete product produced without lime comprises the concrete product obtained by the method for producing the aerated concrete product without lime.
Compared with the prior art, the invention has the following beneficial effects:
according to the lime-free aerated concrete product and the production method, the special cement is adopted to replace lime to produce the aerated concrete product, so that the stability of raw materials can be maintained, and the production quality can be stably controlled; breaking monopoly and reducing the increase of production cost caused by continuous rising of lime; one material can be added in each die, so that the stirring time is saved, and the production rhythm is accelerated; and has better appearance size, larger density and strength compared with the prior concrete product produced by lime.
Drawings
For a clearer explanation of the embodiments or technical solutions in the prior art of the present application, the drawings used in the description of the embodiments or prior art will be briefly described below, it is obvious that the drawings in the following description are only references to some embodiments in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a photograph showing the external appearance of a concrete product prepared by the prior art.
Fig. 2 is a photograph of the appearance of a concrete article according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
A method of producing an aerated concrete product without lime comprising:
step S1: the slurry and cement containing free calcium oxide are mixed and stirred, and water is optionally added during stirring.
Wherein, under the condition of not calculating water, the mass ratio of the cement content in the mixture can be 28-33 percent, namely the dry material ratio of each component.
The cement is preferably cement containing 25-28% by mass of free calcium oxide.
The cement slurry containing free calcium oxide is mixed with the slurry prepared by grinding the quartz sand according to a certain proportion, and water is added for stirring.
In the case of not calculating water, the mass ratio of the slurry content is preferably controlled within 47-50% to improve the quality of the aerated concrete. Namely, the dry material accounts for the mass ratio of the whole material, and if the slurry is prepared by grinding quartz sand, the quartz sand accounts for 47-50% of the total mass ratio except water.
In general, 20 to 25% by mass of the waste slurry, excluding water, may be added in this step. The waste slurry is generally formed by mixing the leftover materials cut from the formed blank body with water (the slurry, cement and aluminum powder form the blank body), so that the waste materials such as the leftover materials are recycled.
The free calcium oxide can maintain 25% -28% of the free calcium oxide during the formation of the compound by lowering the calcination temperature during the calcination of the portland cement.
Step S2: adding foaming agent and stirring again; for example, aluminum powder can be used as the foaming agent, but the present invention is not limited thereto, and other foaming agents capable of achieving the similar object of the present invention can be used.
The mass ratio of the added foaming agent is 0.09-0.13% without counting the mass of water.
Before pouring, a reasonable water-material ratio is set, generally within the range of 0.63-0.67, and the optimal mode is 0.65. The water-material ratio is the ratio of water to the total mass of the dry materials.
Step S3: pouring the mixed and stirred materials, wherein a reasonable pouring temperature is selected, and the preferable pouring temperature is 46-49 ℃.
Step S4: and (4) after foaming by the foaming agent, standing and maintaining the poured material to obtain a molded blank.
Step S5: and when the formed blank reaches the cutting hardness, cutting the blank to obtain a cut concrete product.
Step S6: and (5) carrying out autoclaved curing on the cut concrete product to obtain a final product. For example, after the blank is cut, the blank is put into a high-temperature pressure container to be autoclaved according to a reasonable autoclave operation method.
One embodiment of the invention
And (4) measuring slurry, waste slurry, special cement, external water and aluminum powder according to the calculated formula. The specific formulation of this example is as follows:
the slurry, the waste slurry and the additional water are fed into a pouring stirring tank and stirred for 50s, then the special cement is fed into the pouring stirring tank and stirred for 180s, and the consistency is manually measured.
And after the consistency is measured, when the temperature reaches 46 ℃, adding aluminum powder into a stirring tank, stirring for 50s, discharging into a mold frame, and recording the pouring temperature of 48 ℃ and the pouring time.
And placing the mold frame filled with the materials into a pouring static stop room for static maintenance through a pouring ferry vehicle, and tracking the gas generation condition.
Standing for about 20 minutes, then bubbling the embryo body, measuring the temperature during bubbling by using a thermometer, and after the bubbling is finished, the height of the embryo body is 4cm higher than that of the mold frame, and the embryo body slightly sinks by 1cm after 30 min.
After standing for 200min, the hardness of the embryo body reaches the cutting hardness, the temperature during cutting is measured by a thermometer to be 82 ℃, and the embryo body cutting is carried out.
And (3) detecting products after the products are taken out of the kettle:
1) the external dimension of the product is as follows: the color of the block produced by lime of the same proportion is slightly white, the block expands 2mm in the 600 direction and expands 1-2mm compared with the block produced by lime of the same proportion, and the appearance is shown in figure 2.
2) The volume weight and the strength of the building block when the building block is taken out of the kettle:
3) oven dry basis weight and strength of drying test:
in conclusion, the concrete product produced by adopting the special cement containing the free calcium oxide not only has better appearance size, but also has higher density and strength compared with the existing concrete product produced by using lime.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally in this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure and claims of this application. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (10)
1. A method for producing an aerated concrete product without lime, which is characterized by comprising the following steps:
step S1: mixing and stirring the slurry and cement containing free calcium oxide, and selectively adding water in the stirring process;
step S2: adding foaming agent and stirring again;
step S3: pouring the mixed and stirred materials;
step S4: standing and maintaining the poured material to obtain a molded blank;
step S5: and when the formed blank reaches the cutting hardness, cutting the blank to obtain the cut concrete product.
2. A method of lime-free production of aerated concrete products according to claim 1, characterised in that the cement contains 25-28% by mass of free calcium oxide.
3. The method for lime-free production of aerated concrete products according to claim 2, characterized in that the free calcium oxide is obtained by lowering the calcination temperature.
4. The method for producing an aerated concrete product without lime according to claim 1, wherein the cement content is 28-33% by mass without calculating water.
5. The method of lime-free production of aerated concrete products according to claim 1, wherein the foaming agent is aluminum powder.
6. The method for producing an aerated concrete product without lime according to claim 1, wherein the casting temperature of step S3 is 46-49 ℃.
7. The method of lime-free production of an aerated concrete product according to claim 1, further comprising:
step S6: and (5) carrying out autoclaved curing on the cut concrete product to obtain a final product.
8. The method for producing an aerated concrete product without lime according to claim 1, wherein 20 to 25 mass% of the waste slurry is further added in the step S1 without calculating water.
9. The method for producing an aerated concrete product without lime according to claim 1, wherein the mass ratio of the slurry content in step S1 is 47-50% without calculating water.
10. An aerated concrete product produced without lime, characterized by a concrete product obtained by a method for producing an aerated concrete product without lime according to any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111102956.9A CN113800841A (en) | 2021-09-16 | 2021-09-16 | Lime-free aerated concrete product and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111102956.9A CN113800841A (en) | 2021-09-16 | 2021-09-16 | Lime-free aerated concrete product and production method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN113800841A true CN113800841A (en) | 2021-12-17 |
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| CN202111102956.9A Pending CN113800841A (en) | 2021-09-16 | 2021-09-16 | Lime-free aerated concrete product and production method thereof |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101294942A (en) * | 2008-06-10 | 2008-10-29 | 长安大学 | Method and device for measuring free calcium oxide in cement or coal ash by microwave heating |
| CN102850012A (en) * | 2012-05-31 | 2013-01-02 | 贵州省建筑材料科学研究设计院 | Manufacturing method of high-calcium solid sulfur ash aerated concrete building blocks |
| CN105174833A (en) * | 2015-08-14 | 2015-12-23 | 江苏金立方环保科技有限公司 | Production technology for autoclaved aerated concrete building block |
| CN105198331A (en) * | 2015-09-14 | 2015-12-30 | 河南兴安新型建筑材料有限公司 | Lime-free Yellow River sand autoclaved aerated concrete and preparation method thereof |
| CN105503105A (en) * | 2015-12-25 | 2016-04-20 | 河南兴安新型建筑材料有限公司 | Lime-free and low-density autoclaved aerated concrete block and preparation method thereof |
| CN105541253A (en) * | 2015-12-25 | 2016-05-04 | 河南兴安新型建筑材料有限公司 | Lime-free B05-level autoclaved aerated concrete and preparation method thereof |
| CN110372281A (en) * | 2019-08-19 | 2019-10-25 | 重庆中科建设（集团）有限公司 | A kind of air entrained concrete and preparation method thereof of high intensity lower shrinkage |
| CN112723847A (en) * | 2020-12-31 | 2021-04-30 | 陕西凝远新材料科技股份有限公司 | Method for producing aerated concrete by using aeolian sand |
-
2021
- 2021-09-16 CN CN202111102956.9A patent/CN113800841A/en active Pending
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| CN101294942A (en) * | 2008-06-10 | 2008-10-29 | 长安大学 | Method and device for measuring free calcium oxide in cement or coal ash by microwave heating |
| CN102850012A (en) * | 2012-05-31 | 2013-01-02 | 贵州省建筑材料科学研究设计院 | Manufacturing method of high-calcium solid sulfur ash aerated concrete building blocks |
| CN105174833A (en) * | 2015-08-14 | 2015-12-23 | 江苏金立方环保科技有限公司 | Production technology for autoclaved aerated concrete building block |
| CN105198331A (en) * | 2015-09-14 | 2015-12-30 | 河南兴安新型建筑材料有限公司 | Lime-free Yellow River sand autoclaved aerated concrete and preparation method thereof |
| CN105503105A (en) * | 2015-12-25 | 2016-04-20 | 河南兴安新型建筑材料有限公司 | Lime-free and low-density autoclaved aerated concrete block and preparation method thereof |
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| CN110372281A (en) * | 2019-08-19 | 2019-10-25 | 重庆中科建设（集团）有限公司 | A kind of air entrained concrete and preparation method thereof of high intensity lower shrinkage |
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