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CN117105545A - Modified quicklime for autoclaved aerated concrete and preparation method thereof - Google Patents

Modified quicklime for autoclaved aerated concrete and preparation method thereof Download PDF

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Publication number
CN117105545A
CN117105545A CN202311097990.0A CN202311097990A CN117105545A CN 117105545 A CN117105545 A CN 117105545A CN 202311097990 A CN202311097990 A CN 202311097990A CN 117105545 A CN117105545 A CN 117105545A
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Prior art keywords
quicklime
aerated concrete
autoclaved aerated
modified
powder
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CN202311097990.0A
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Chinese (zh)
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CN117105545B (en
Inventor
邱汉明
邱汉
胡维
熊德志
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Wuhan Xinxiangwang Industrial Co ltd
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Wuhan Xinxiangwang Industrial Co ltd
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00Hydraulic cements
    • C04B7/34Hydraulic lime cements; Roman cements ; natural cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2/00Lime, magnesia or dolomite
    • C04B2/02Lime
    • C04B2/04Slaking
    • C04B2/06Slaking with addition of substances, e.g. hydrophobic agents ; Slaking in the presence of other compounds
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B22/00Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators or shrinkage compensating agents
    • C04B22/06Oxides, Hydroxides
    • C04B22/062Oxides, Hydroxides of the alkali or alkaline-earth metals
    • C04B22/064Oxides, Hydroxides of the alkali or alkaline-earth metals of the alkaline-earth metals
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14Compositions 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 calcium sulfate cements
    • C04B28/142Compositions 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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
    • C04B28/144Compositions 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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/02Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/40Porous or lightweight materials
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/20Mortars, concrete or artificial stone characterised by specific physical values for the density
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention discloses a modified quicklime for autoclaved aerated concrete and a preparation method thereof, wherein the invention firstly utilizes a silane coupling agent to carry out surface treatment on the quicklime, then coats a layer of cellulose acetate on the surface of the quicklime, and when the modified quicklime is mixed with water, along with the extension of time, part of the non-coated quicklime is hydrated to generate OH After that, cellulose acetate and a silane coupling agent are gradually hydrolyzed to release the quicklime, and the method delays the reaction speed of the quick quicklime after the quick quicklime contacts with water through the synergistic effect of the silane coupling agent and the cellulose acetate, avoids the loss of die collapse, thickening and gas-generating asynchronism caused by high pouring temperature, cutting fracture caused by different hardness of a blank body and the like caused by over-quick pouring temperature collapse, and reduces the reactivity of the quicklime, so that the prepared autoclaved aerated concrete has more uniform pore structure, lower density, higher strength and better durability.

Description

Modified quicklime for autoclaved aerated concrete and preparation method thereof
Technical Field
The invention relates to the technical field of building materials, in particular to modified quicklime for autoclaved aerated concrete and a preparation method thereof.
Background
The low-density autoclaved aerated concrete production process is mature, namely autoclaved aerated concrete is produced by mixing grinding sand or fly ash, cement, gypsum, quicklime, foaming agent and water and steaming; firstly, the chemical reaction is that quicklime reacts with water to release heat and generate calcium hydroxide, the generated calcium hydroxide reacts with water and aluminum powder in turn to form hydrogen, the volume of the hydrogen is expanded by two times or more, so that a porous material is formed, and then the porous material is cut into the required size and shape and placed in an autoclave to obtain good strength, rigidity and durability; the autoclave is a sealed container filled with high-pressure steam, and a second chemical reaction occurs in the high-temperature autoclave process, namely the formation process from C-S-H gel to Tobolmorite.
During the reaction between water, quicklime and aluminum, heat is generated and the exothermic process needs to be controlled, because the excessively rapid temperature rise of the blank can cause difficulties in controlling the gas generating process and have adverse effects, such as uneven pore size of the final blank. The medium-speed lime has slow reaction and limited heat release speed, has been widely applied to the manufacture of autoclaved aerated concrete, has a certain difficulty in using the medium-speed quicklime, and comprises that the medium-speed quicklime is more expensive than the soft burnt quicklime, the high-activity quicklime like that used in the steel industry cannot use the medium-speed lime, the lime kiln is inconvenient to produce lime with different properties, and the like; another inconvenience is that medium speed lime requires a long calcination time, thus slowing down the production rate, so that plants that conditionally use medium speed lime are few. Furthermore, by varying the calcination temperature, the calcination duration and the type of calcination furnace used, the reaction characteristics of quicklime can range from high reactivity of light calcined quicklime to low reactivity of hard calcined quicklime, such a method of controlling the reaction characteristics of quicklime in autoclaved aerated concrete requires a lot of time to fumbly with experience, and lime produced in lime kilns is often not specific to aerated concrete plants.
Therefore, the slaking characteristics of the quicklime need to be finely adjusted, and the reaction characteristics of the quicklime are regulated and controlled by using the additive, so that the quicklime treated by the chemical additive has controlled reaction characteristics and does not adversely affect the quality of the produced final autoclaved aerated concrete.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the modified quicklime for autoclaved aerated concrete and the preparation method thereof, and the reactivity of the quick quicklime is effectively reduced by modifying the quick quicklime.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the preparation method of the modified quicklime for autoclaved aerated concrete comprises the following steps:
s1, adding a silane coupling agent into absolute ethyl alcohol, uniformly mixing, then adding quicklime powder into the mixture, stirring for 30-60min, and then drying a solvent to obtain powder;
s2, adding cellulose acetate into an organic solvent DMF, stirring and dissolving to obtain a coating solution;
and S3, adding the powder into a coating machine, then spraying coating liquid, and drying with hot air to obtain the modified quicklime.
Preferably, in step S1, the silane coupling agent is selected from KH560.
Preferably, in the step S1, the mass ratio of the silane coupling agent to the anhydrous ethanol to the quicklime powder is 0.4-0.8:100-150:60-80.
Preferably, in step S1, the particle size of the quicklime powder is 200-1000 meshes.
Preferably, in the step S2, the mass ratio of the cellulose acetate to the organic solvent DMF is 1-3:100.
Preferably, in step S3, the thickness of the coating layer is 0.05-0.1mm.
The invention provides the modified quicklime prepared by the preparation method.
The invention also provides application of the modified quicklime in autoclaved aerated concrete.
Preferably, the autoclaved aerated concrete comprises the following raw materials: fly ash, cement, modified quicklime, desulfurized gypsum, aluminum powder and water.
Compared with the prior art, the invention has the following beneficial effects:
the invention firstly utilizes silane coupling agent to carry out surface treatment on quicklime, then coats a layer of cellulose acetate on the surface of the quicklime, and when the modified quicklime is mixed with water, along with the extension of time, part of the non-coated quicklime is hydrated to generate OH After that, cellulose acetate and a silane coupling agent are gradually hydrolyzed to release the quicklime, and the method delays the reaction speed of the quick quicklime after the quick quicklime contacts with water through the synergistic effect of the silane coupling agent and the cellulose acetate, reduces the reaction activity of the quick quicklime, and avoids the loss of gas holding cracks, cutting cracks and the like caused by the fact that the pouring temperature is high, thickening and gas generation are asynchronous, and the like caused by the fact that the quick quicklime is digested too fast in the prior art, and the prepared autoclaved aerated concrete has more uniform gas hole structure, lower density, higher strength and better durability through the reduction of the reaction activity of the quicklime.
Drawings
FIG. 1 is a graph showing the heat release of the modified quicklime prepared in example 1 and comparative examples 1-2 according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following preferred examples, but the present invention is not limited to the following examples.
Unless otherwise specified, the chemical reagents involved in the present invention are all commercially available.
The quicklime used in the invention is quick quicklime, the effective calcium oxide content is 92.46 percent, and the grain diameter is 400 meshes.
Example 1
The preparation method of the modified quicklime for autoclaved aerated concrete comprises the following steps:
s1, adding 0.5g of silane coupling agent KH560 into 100g of absolute ethyl alcohol, uniformly mixing, then adding 60g of quicklime powder into the mixture, stirring for 45min, and then drying the solvent at 80 ℃ to obtain powder;
s2, adding 2g of cellulose acetate into 100g of organic solvent DMF, stirring and dissolving to obtain coating liquid;
s3, adding the powder into a coating machine, setting the rotating speed to be 15r/min, adjusting the pressure of a spray gun to be 0.1MPa, then spraying coating liquid, drying by hot air, and obtaining the modified quicklime with the thickness of a coating layer of 0.1mm.
Example 2
The preparation method of the modified quicklime for autoclaved aerated concrete comprises the following steps:
s1, adding 0.8g of silane coupling agent KH560 into 150g of absolute ethyl alcohol, uniformly mixing, then adding 80g of quicklime powder into the mixture, stirring for 45min, and then drying the solvent at 80 ℃ to obtain powder;
s2, adding 1g of cellulose acetate into 100g of organic solvent DMF, stirring and dissolving to obtain coating liquid;
s3, adding the powder into a coating machine, setting the rotating speed to be 15r/min, adjusting the pressure of a spray gun to be 0.1MPa, then spraying coating liquid, drying by hot air, and obtaining the modified quicklime with the thickness of a coating layer of 0.1mm.
Example 3
The preparation method of the modified quicklime for autoclaved aerated concrete comprises the following steps:
s1, adding 0.4g of silane coupling agent KH560 into 150g of absolute ethyl alcohol, uniformly mixing, then adding 70g of quicklime powder into the mixture, stirring the mixture for 45min, and then drying the solvent at 80 ℃ to obtain powder;
s2, adding 3g of cellulose acetate into 100g of organic solvent DMF, stirring and dissolving to obtain coating liquid;
s3, adding the powder into a coating machine, setting the rotating speed to be 15r/min, adjusting the pressure of a spray gun to be 0.1MPa, then spraying coating liquid, drying by hot air, and obtaining the modified quicklime with the thickness of a coating layer of 0.1mm.
Example 4
The preparation method of the modified quicklime for autoclaved aerated concrete comprises the following steps:
s1, adding 0.7g of silane coupling agent KH560 into 150g of absolute ethyl alcohol, uniformly mixing, then adding 70g of quicklime powder into the mixture, stirring the mixture for 45min, and then drying the solvent at 80 ℃ to obtain powder;
s2, adding 2.5g of cellulose acetate into 100g of organic solvent DMF, stirring and dissolving to obtain coating liquid;
s3, adding the powder into a coating machine, setting the rotating speed to be 15r/min, adjusting the pressure of a spray gun to be 0.1MPa, then spraying coating liquid, drying by hot air, and obtaining the modified quicklime with the thickness of a coating layer of 0.1mm.
Comparative example 1
The preparation method of the modified quicklime for autoclaved aerated concrete comprises the following steps:
0.5g of silane coupling agent KH560 is added into 100g of absolute ethyl alcohol, and uniformly mixed, then 60g of quicklime powder is added into the mixture, the mixture is stirred for 45min, and then the solvent is dried at 80 ℃ to obtain the modified quicklime.
Comparative example 2
The preparation method of the modified quicklime for autoclaved aerated concrete comprises the following steps:
s1, adding 2g of cellulose acetate into 100g of organic solvent DMF, stirring and dissolving to obtain coating liquid;
s2, adding quicklime powder into a coating machine, setting the rotating speed to be 15r/min, adjusting the pressure of a spray gun to be 0.1MPa, spraying coating liquid, drying by hot air, and obtaining the modified quicklime with the thickness of a coating layer of 0.1mm.
In order to evaluate the reaction characteristics of the modified quicklime prepared in the present invention, 150g of the modified quicklime prepared in example 1 and comparative examples 1-2 were weighed, respectively, and then mixed with 600g of water, respectively, to determine the exotherm curves of quicklime at different times, wherein 150g of quicklime was directly mixed with 600g of water as a blank, and the test results are shown in fig. 1, in which it can be seen that the reactivity of quicklime can be effectively reduced by modifying quicklime with a silane coupling agent and cellulose acetate.
Finally, it should be noted that: the above examples are not intended to limit the present invention in any way. Modifications and improvements will readily occur to those skilled in the art upon the basis of the present invention. Accordingly, any modification or improvement made without departing from the spirit of the invention is within the scope of the invention as claimed.

Claims (9)

1. The preparation method of the modified quicklime for autoclaved aerated concrete is characterized by comprising the following steps of:
s1, adding a silane coupling agent into absolute ethyl alcohol, uniformly mixing, then adding quicklime powder into the mixture, stirring for 30-60min, and then drying a solvent to obtain powder;
s2, adding cellulose acetate into an organic solvent DMF, stirring and dissolving to obtain a coating solution;
and S3, adding the powder into a coating machine, then spraying coating liquid, and drying with hot air to obtain the modified quicklime.
2. The method for preparing modified quicklime for autoclaved aerated concrete as claimed in claim 1, wherein the silane coupling agent is selected from KH560 in step S1.
3. The method for preparing modified quicklime for autoclaved aerated concrete as claimed in claim 1, wherein in the step S1, the mass ratio of the silane coupling agent, the anhydrous ethanol and the quicklime powder is 0.4-0.8:100-150:60-80.
4. The method for producing modified quicklime for autoclaved aerated concrete as claimed in claim 1, wherein in step S1, the particle size of quicklime powder is 200-1000 mesh.
5. The method for preparing modified quicklime for autoclaved aerated concrete as claimed in claim 1, wherein in step S2, a mass ratio of cellulose acetate to organic solvent DMF is 1-3:100.
6. The method for preparing modified quicklime for autoclaved aerated concrete as claimed in claim 1, wherein the thickness of the coating layer is 0.05-0.1mm in step S3.
7. The modified quicklime prepared by the preparation method as claimed in any one of claims 1 to 6.
8. Use of the modified quicklime of claim 7 in autoclaved aerated concrete.
9. Use of modified quicklime in autoclaved aerated concrete as claimed in claim 8, characterized in that said autoclaved aerated concrete comprises the following raw materials: fly ash, cement, modified quicklime, desulfurized gypsum, aluminum powder and water.
CN202311097990.0A 2023-08-29 2023-08-29 Modified quicklime for autoclaved aerated concrete and preparation method thereof Active CN117105545B (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01208317A (en) * 1987-10-20 1989-08-22 Seii Kogyo Kk Control of slaking reaction time of quick lime
JPH1060431A (en) * 1996-08-26 1998-03-03 Ube Chem Ind Co Ltd Quick lime of delayed hydration, its production and soil quality improver
US6395205B1 (en) * 1996-07-17 2002-05-28 Chemical Lime Company Method of manufacturing an aerated autoclaved concrete material
CN104671700A (en) * 2015-02-05 2015-06-03 江苏苏博特新材料股份有限公司 Modified calcium oxide expansive agent used for cement concrete and preparation method thereof
CN106079030A (en) * 2016-06-14 2016-11-09 西安交通大学 A kind of method for fast mfg of the calcium oxide-based ceramic-mould of powder overlay film
CN106186976A (en) * 2016-07-14 2016-12-07 济南大学 A kind of condensation controllable type complex cement base sealing material and application process thereof
CN106732788A (en) * 2016-11-30 2017-05-31 浙江理工大学 A kind of quick lime method of modifying for catalyzed by solid base
CN115572101A (en) * 2022-10-31 2023-01-06 山西格瑞特建筑科技股份有限公司 Slow-release air entraining agent and preparation method and application thereof

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01208317A (en) * 1987-10-20 1989-08-22 Seii Kogyo Kk Control of slaking reaction time of quick lime
US6395205B1 (en) * 1996-07-17 2002-05-28 Chemical Lime Company Method of manufacturing an aerated autoclaved concrete material
JPH1060431A (en) * 1996-08-26 1998-03-03 Ube Chem Ind Co Ltd Quick lime of delayed hydration, its production and soil quality improver
CN104671700A (en) * 2015-02-05 2015-06-03 江苏苏博特新材料股份有限公司 Modified calcium oxide expansive agent used for cement concrete and preparation method thereof
CN106079030A (en) * 2016-06-14 2016-11-09 西安交通大学 A kind of method for fast mfg of the calcium oxide-based ceramic-mould of powder overlay film
CN106186976A (en) * 2016-07-14 2016-12-07 济南大学 A kind of condensation controllable type complex cement base sealing material and application process thereof
CN106732788A (en) * 2016-11-30 2017-05-31 浙江理工大学 A kind of quick lime method of modifying for catalyzed by solid base
CN115572101A (en) * 2022-10-31 2023-01-06 山西格瑞特建筑科技股份有限公司 Slow-release air entraining agent and preparation method and application thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
张美霞等: "改性生石灰制备蒸压加气混凝土砌块的研究", 墙材革新与建筑节能, no. 11, 30 November 2017 (2017-11-30), pages 1 - 3 *

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