CN111704430A - Environment-friendly aerated brick and preparation method thereof - Google Patents

Environment-friendly aerated brick and preparation method thereof Download PDF

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CN111704430A
CN111704430A CN202010619095.0A CN202010619095A CN111704430A CN 111704430 A CN111704430 A CN 111704430A CN 202010619095 A CN202010619095 A CN 202010619095A CN 111704430 A CN111704430 A CN 111704430A
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parts
powder
aerated brick
wood
environment
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CN111704430B (en
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黄恒林
黄伟伟
陈煊敏
黄锦彬
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Huizhou Yingjian 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
    • 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
    • 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
    • C04B2111/00017Aspects relating to the protection of the environment
    • 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
    • C04B2111/52Sound-insulating materials

Abstract

The application relates to the technical field of brick preparation, in particular to an environment-friendly aerated brick, which comprises 30-40 parts of cement, 50-70 parts of fly ash, 20-25 parts of lime, 19-28 parts of gypsum, 10-18 parts of ceramsite, 20-30 parts of wood powder and 0.5-1 part of aluminum powder; the preparation method comprises the following steps: s1, preparing cementing slurry; s2, preparing a mixture A; s3, preparing a gas former solution; s4, preparing slurry foam concrete; s5, casting and forming; s6, cutting the blank; and S7, performing autoclaved curing to obtain the aerated brick. The aerated brick has good structural strength and sound absorption performance, and can be applied to buildings with high sound insulation requirements.

Description

Environment-friendly aerated brick and preparation method thereof
Technical Field
The application relates to the technical field of brick preparation, in particular to an environment-friendly aerated brick and a preparation method thereof.
Background
The aerated brick is also called as autoclaved aerated concrete block in the industry, and is a new material in the field of buildings. It is made up by using calcium material and siliceous material as raw material, adding aluminium powder as air-entraining agent, adding water, stirring, casting and forming, gas-forming expansion, precuring and cutting, and then curing by high-pressure steam to obtain the porous silicate building block.
The existing aerated brick can be used as a good sound absorption material because the interior of the aerated brick is provided with a plurality of pores and sound energy is consumed in the pores. However, the gaps of the internal structure of the aerated brick are more, so that the structural strength is relatively poor. Therefore, there is also room for improvement.
Disclosure of Invention
The invention aims to provide an environment-friendly aerated brick which is beneficial to improving the sound absorption performance of the aerated brick under the condition of ensuring the structural strength of the aerated brick.
The second purpose of the invention is to provide a preparation method of the environment-friendly aerated brick, and the prepared aerated brick has good structural strength and sound absorption performance.
In order to achieve the first object, the invention provides the following technical scheme: the environment-friendly aerated brick comprises the following components in parts by mass:
30-40 parts of cement
50-70 parts of fly ash
20-25 parts of lime
19-28 parts of gypsum
10-18 parts of ceramsite
20-30 parts of wood powder
0.5-1 part of aluminum powder.
By adopting the technical scheme, cement, lime and ceramsite are used as main components, the lime is hydrated to generate alkali, and the aluminum powder is added, so that the aluminum powder can easily react with the alkali and release heat, and the hardening of a concrete blank is accelerated; meanwhile, the aluminum powder can react with alkali to generate hydrogen, so that small bubbles are easily formed in the concrete building block brick, micropores are formed in the concrete building block brick, and the sound absorption performance of the aerated brick is enhanced. The added fly ash reacts with lime to generate hydrated silicate substances which play a role in enhancing the structural strength of the aerated brick, the main component of the wood flour is fiber, and the addition of the wood flour is favorable for enhancing the structural strength of the aerated brick on one hand and enhancing the sound absorption performance of the aerated brick on the other hand because the fiber has good adsorption performance, so that the reflection path of sound is reduced, and the wood flour, the ceramsite, the fly ash, the lime and the cement are compounded according to a specific mass part range, so that the prepared aerated brick has a good sound absorption effect on the premise of having good structural strength.
Further, the wood flour comprises one or more of wood flour, branch flour and bark flour.
Further, the wood flour is a mixture of wood flour and branch flour in a weight ratio of (2-3): 1.
Through adopting above-mentioned technical scheme, the interpolation of saw-dust does benefit to the structural strength and the sound absorption performance of reinforcing air entrainment brick, the interpolation of branch powder, play the synergism with the saw-dust on the one hand, the structural strength to air entrainment brick plays the effect of further reinforcing, on the other hand, branch powder has good dispersibility can, branch powder and saw-dust are compounded according to the weight ratio of specific scope and are made wood flour, be favorable to making wood flour can mix in the raw materials system who is used for preparing air entrainment brick more evenly, realize further promoting air entrainment brick's sound absorption effect and structural strength.
Further, the wood chips need to be pretreated before being prepared into wood flour, and the pretreatment method comprises the following steps:
(1) selecting raw materials: selecting sawdust generated by processing in a wood processing field;
(2) crushing and screening: crushing the wood chips obtained in the step (1) to obtain wood chip powder with the particle size of 2-3 mm;
(3) and (3) drying: drying the wood chips at a drying temperature of 75-85 ℃ for 20-30 min;
(4) medium-temperature pyrolysis: putting the wood chips into a closed pyrolysis furnace, adding nitrogen for pyrolysis protection, controlling the temperature at 300 ℃ and 330 ℃ and the pyrolysis time at 0.5-1.5 h;
(5) and (3) post-treatment: and (4) taking out the wood chips treated in the step (4), and insulating air to cool to 25-28 ℃, thus obtaining the pretreated wood chips.
By adopting the technical scheme, under the pyrolysis action of 300-330 ℃, the wood chips leave non-hydrophilic cellulose and lignin components, and the number of the pore channels formed inside the wood chips subjected to the pyrolysis action is more, so that the adsorption effect of the wood chips is enhanced, and the sound absorption performance of the aerated brick can be enhanced. In addition, lignin in the wood chips is beneficial to improving the bonding performance between the wood chips and other components, and is beneficial to further enhancing the overall sound absorption performance of the aerated brick.
Further, the preparation method of the branch powder comprises the following steps: drying the branches until the water content is less than or equal to 2.6%, and then crushing the branches into 80-100 meshes to obtain the branch powder.
Furthermore, the branches adopted by the branch powder are one or two of branches of Chinese parasol trees and cypress trees which are abandoned by intermediate cutting.
Further, the aerated brick comprises the following components in parts by mass:
34-40 parts of cement
62-70 parts of fly ash
24-25 parts of lime
25-28 parts of gypsum
15-18 parts of ceramsite
25-30 parts of wood powder
0.9-1 part of aluminum powder.
Further, the aerated brick comprises the following components in parts by mass:
38 portions of cement
68 portions of fly ash
Lime 24.5 parts
26.5 parts of gypsum
17 parts of ceramsite
29 parts of wood powder
1 part of aluminum powder.
By adopting the technical scheme, the aerated brick prepared by compounding the components according to the specific parts by mass can be used for improving the sound absorption effect of the aerated brick under the condition that the aerated brick has good structural strength, so that the aerated brick can be applied to buildings with high sound insulation requirements.
In order to achieve the second object, the invention provides the following technical scheme:
the preparation method of the environment-friendly aerated brick comprises the following steps:
s1, preparing a cementing slurry: mixing lime, cement and gypsum in corresponding parts by mass, and stirring for 10-15 minutes to prepare a cementing slurry;
s2, preparation of mixture a: mixing and stirring the ceramsite and the cementing slurry prepared in the step S1, wherein the stirring temperature is 30-37 ℃, then adding the corresponding mass part of fly ash, stirring for 15-25min, adding the corresponding mass part of wood powder while stirring, heating to 45-50 ℃ after the wood powder is completely added, and stirring for 2-3min to prepare a mixture A;
s3, preparing a gas former solution: adding water and aluminum powder according to the weight ratio of the water to the aluminum powder of (25-30) to 1 for diluting and stirring for 2-3 minutes to obtain a gas former solution;
s4, preparing slurry foam concrete: adding the foaming agent solution prepared in the step S2 into the mixture A, and stirring for 0.5-1min to obtain slurry foam concrete;
s5, casting and forming: immediately pouring the slurry foam concrete obtained in the step S3 into a mould, and sending the mould into a hot chamber for standing and curing to obtain a formed aerated concrete module blank;
s6, cutting the blank: the formed aerated concrete module blank obtained in the step S4 is subjected to hot-chamber standing maintenance and reaches the cutting strength, the mould frame is removed, and cutting is carried out according to the preset size, so as to obtain a semi-formed aerated brick;
s7, steam pressure curing: and (4) feeding the semi-formed aerated brick prepared in the step (S6) into a still kettle, and sequentially carrying out vacuumizing, steam adding, temperature and pressure raising, constant temperature and pressure raising, temperature and pressure lowering, and pressure lowering to complete the autoclaved curing process to obtain the aerated brick.
By adopting the technical scheme, the cementing slurry is prepared, then the ceramsite is added into the cementing slurry and stirred at the temperature of 30-37 ℃, so that the ceramsite can be more uniformly mixed in the cementing slurry, and the ceramsite can better play a skeleton role in the cementing slurry; and the fly ash is added in the next step, so that the fly ash can be fully filled in gaps formed between the ceramsite and the ceramsite, the wood powder is added in the next step, and the wood powder can be fully and uniformly mixed in the mixture A only within 2-3min after stirring because the wood powder has good adsorption performance and dispersion performance, so that the prepared aerated brick has good structural strength and sound absorption performance.
Further, in step S5, the temperature of the concrete casting is 36-40 ℃.
In conclusion, the invention has the following beneficial effects:
firstly, as the cement, the lime and the ceramsite are adopted as main components, the fly ash reacts with the lime to generate hydrated silicate substances, the structural strength of the aerated brick is enhanced, the main component of the wood flour is the fiber, and the addition of the wood flour is beneficial to enhancing the structural strength of the aerated brick on one hand and is beneficial to enhancing the sound absorption performance of the aerated brick on the other hand because the fiber has good adsorption performance, so that the reflection path of sound is reduced, and the wood flour, the ceramsite, the fly ash, the lime and the cement are compounded according to a specific mass part range, so that the prepared aerated brick has good sound absorption effect on the premise of having good structural strength.
Secondly, in the invention, under the pyrolysis action of 300-330 ℃, the wood chips leave non-hydrophilic cellulose and lignin components, and the number of the pore channels formed inside the wood chips subjected to the pyrolysis action is more, so that the adsorption effect is enhanced, and the sound absorption performance of the aerated brick can be enhanced. In addition, lignin in the wood chips is beneficial to improving the bonding performance between the wood chips and other components, and is beneficial to further enhancing the overall sound absorption performance of the aerated brick.
Thirdly, preparing cementing slurry, then adding the ceramsite into the cementing slurry, and stirring at the temperature of 30-37 ℃, so that the ceramsite can be more uniformly mixed in the cementing slurry, and the ceramsite can better play a skeleton role in the cementing slurry; and the fly ash is added in the next step, so that the fly ash can be fully filled in gaps formed between the ceramsite and the ceramsite, the wood powder is added in the next step, and the wood powder can be fully and uniformly mixed in the mixture A only within 2-3min after stirring because the wood powder has good adsorption performance and dispersion performance, so that the prepared aerated brick has good structural strength and sound absorption performance.
Drawings
FIG. 1 is a flow chart of a preparation method of the environment-friendly aerated brick provided by the invention.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples.
In the following examples, Portland cement sold by Ender sea snail Cement, Inc. under the model number PO42.5(R) was used as the cement.
In the following examples, class II fly ash from a Baifeng mineral processing plant, Lingshu county, was used as the fly ash.
In the following examples, gypsum was prepared from powdered gypsum of Minnan comma qi chemical Co., Ltd, having a product number of 1003.
In the following examples, the lime is 100-800 mesh lime, available from Baojia calcium industries, ltd, southern prefecture, Guangxi province.
In the following examples, aluminum powder of Handan-silver spring aluminum powder Co., Ltd, type GLS-65, was used as the aluminum powder.
In the following examples, all the equipments used in the preparation method of the present invention, such as a pulverizer, a drying oven, etc., are equipments conventionally used in the art.
In the following examples, the aerated concrete block may further comprise other conventional additives, such as hollow glass beads, and the addition of the conventional additives has no substantial influence on the scheme of the invention.
Table 1 components and parts by mass (unit/Kg) of aerated bricks.
Figure BDA0002562399220000061
Example 1
The components and parts by mass of the environment-friendly aerated brick are shown in Table 1.
Wherein the wood flour is wood flour, and the average particle size of the wood flour is 2 mm.
The average grain diameter of the ceramsite is 10 mm.
The embodiment also provides a preparation method for preparing the environment-friendly aerated brick, and the preparation method is shown in fig. 1 and comprises the following steps:
s1, preparing a cementing slurry: and mixing lime, cement and gypsum in corresponding parts by mass, and stirring for 10 minutes to prepare the cementing slurry.
S2, preparation of mixture a: and (4) mixing and stirring the ceramsite in the corresponding mass part and the cementing slurry prepared in the step (S1), wherein the stirring temperature is 30 ℃, then adding the fly ash in the corresponding mass part, stirring for 15min, adding the wood flour in the corresponding mass part while stirring, after the wood flour is completely added, heating to 45 ℃, and stirring for 2min to obtain a mixture A.
S3, preparing a gas former solution: adding water and aluminum powder according to the weight ratio of 25: 1 of the water to the aluminum powder, diluting and stirring for 2 minutes to obtain a gas former solution.
S4, preparing slurry foam concrete: the solution of the air-forming agent obtained in step S2 was added to the mixture a, and stirred for 0.5min to obtain slurry-like foam concrete.
S5, casting and forming: and (5) immediately pouring the slurry foam concrete obtained in the step (S3) into a mould, and sending the mould into a hot chamber for standing and curing to obtain a formed aerated concrete module blank. The concrete pouring temperature is 36 ℃.
S6, cutting the blank: and (5) performing static curing on the formed aerated concrete module blank obtained in the step (S4) in a hot chamber until the strength of the formed aerated concrete module blank reaches the cutting strength, then removing the mold frame, and cutting according to a preset size to obtain the semi-formed aerated brick.
S7, steam pressure curing: and (4) feeding the semi-formed aerated brick prepared in the step (S6) into a still kettle, and sequentially carrying out vacuumizing, steam adding, temperature and pressure raising, constant temperature and pressure raising, temperature and pressure lowering, and pressure lowering to complete the autoclaved curing process to obtain the aerated brick.
Example 2
An environment-friendly aerated brick is different from the aerated brick in the embodiment 1 in that: the components and parts by mass thereof are shown in table 1.
In this example, wood flour was bark powder, and the average particle size of the bark powder was 2 mm.
Example 3
An environment-friendly aerated brick is different from the aerated brick in example 2 in that: the components and parts by mass thereof are shown in table 1.
In this embodiment, the wood flour is a phoenix tree branch powder, and the preparation method of the phoenix tree branch powder comprises the following steps: and (3) crushing the waste Chinese parasol tree branches which are thinned by a crusher, wherein the mesh number of the Chinese parasol tree branch powder is 80 meshes.
In step S1, lime, cement and gypsum in corresponding parts by mass are mixed and stirred for 12 minutes to prepare a cementing slurry.
In the step S2, the temperature for mixing and stirring the ceramsite and the cementing slurry prepared in the step S1 is 34 ℃. The corresponding mass part of fly ash is added and the stirring time is 20 min. After the wood powder is completely added, the temperature is raised to 48 ℃, and the mixture is stirred for 2.5min to obtain a mixture A.
In step S3, water and aluminum powder are added in a weight ratio of 27: 1 to obtain a gas former solution, and the mixture is diluted and stirred for 2 minutes.
In step S4, the solution of the air-forming agent obtained in step S2 was added to the mixture a, and stirred for 0.5min to obtain slurry-like foamed concrete.
In step S5, the concrete casting temperature is 38 ℃.
Example 4
An environment-friendly aerated brick is different from the aerated brick in example 3 in that: the components and parts by mass thereof are shown in table 1. In this example, the wood flour is a mixture of phoenix tree branch powder and wood flour in a weight ratio of 1: 1.
In step S1, lime, cement and gypsum in corresponding parts by mass are mixed and stirred for 15 minutes to prepare a cementing slurry.
And step S2, stirring the ceramsite and the cementing slurry prepared in the step S1 at the temperature of 37 ℃, then adding the corresponding mass part of fly ash, stirring for 25min, adding the corresponding mass part of wood powder while stirring, heating to 50 ℃ after the wood powder is completely added, and stirring for 3min to obtain a mixture A.
In step S3, water and aluminum powder are added according to the weight ratio of 30: 1 of water to aluminum powder for 3 minutes to dilute and stir, and a gas former solution is obtained.
In step S4, the solution of the air-forming agent obtained in step S2 is added to the mixture A and stirred for 1min to obtain slurry-like foam concrete.
In step S5, the concrete casting temperature is 40 ℃.
Example 5
An environment-friendly aerated brick is different from the aerated brick in example 3 in that: the components and parts by mass thereof are shown in table 1.
Wherein the wood powder is a mixture prepared by mixing Chinese parasol tree branch powder and wood chips in a weight ratio of 2: 1. The preparation method of the cypress branch powder comprises the following steps: and (3) crushing the branches of the cypresses which are cut at intervals by adopting a crusher, wherein the mesh number of the branch powder of the cypress is 80 meshes. The average particle size of the wood chips was 2 mm.
The average grain diameter of the ceramsite is 15 mm.
Example 6
An environment-friendly aerated brick is different from the aerated brick in example 5 in that: the components and parts by mass thereof are shown in table 1.
The wood chips need to be pretreated, and the pretreatment method comprises the following steps:
(1) selecting raw materials: selecting the wood chips produced by processing in a wood processing field.
(2) Crushing and screening: and (2) crushing the wood chips obtained in the step (1) to obtain wood chip powder with the particle size of 2 mm.
(3) And (3) drying: drying the wood chips at a drying temperature of 75-85 ℃ for 20 min.
(4) Medium-temperature pyrolysis: putting the wood chips into a closed pyrolysis furnace, adding nitrogen for pyrolysis protection, controlling the temperature at 300 ℃ and the pyrolysis time at 0.5 h.
(5) And (3) post-treatment: and (4) taking out the wood chips treated in the step (4), and insulating air to cool to 25 ℃ to obtain the pretreated wood chips.
Example 7
An environment-friendly aerated brick is different from the aerated brick in example 6 in that: the components and parts by mass thereof are shown in table 1.
Wherein the wood powder is a mixture of cypress branch powder and wood chips in a weight ratio of 2.5: 1.
The preparation method of the cypress branch powder comprises the following steps:
drying the cypress branches until the moisture content is basically 2.6%, and then crushing the cypress branches to 90 meshes to obtain the cypress branch powder.
Example 8
An environment-friendly aerated brick is different from the aerated brick in example 7 in that: the components and parts by mass thereof are shown in table 1.
The wood flour is a mixture of Chinese parasol tree branch powder and wood dust in a weight ratio of 2.5: 1.
The wood chips need to be pretreated, and the pretreatment method comprises the following steps:
(1) selecting raw materials: selecting the wood chips produced by processing in a wood processing field.
(2) Crushing and screening: and (3) crushing the wood chips obtained in the step (1) to obtain wood chip powder with the particle size of 3 mm.
(3) And (3) drying: drying the wood chips at the drying temperature of 85 ℃ for 30 min.
(4) Medium-temperature pyrolysis: and putting the wood chips into a closed pyrolysis furnace, adding nitrogen for pyrolysis protection, controlling the temperature at 330 ℃ and the pyrolysis time at 1.5 h.
(5) And (3) post-treatment: and (4) taking out the wood chips treated in the step (4), and insulating air to cool to 28 ℃ to obtain the pretreated wood chips.
The preparation method of the phoenix tree branch powder comprises the following steps:
drying the branches until the moisture content is basically 2.5%, and then crushing the branches to 90 meshes to prepare branch powder.
Example 9
An environment-friendly aerated brick is different from the aerated brick in example 8 in that: the components and parts by mass thereof are shown in table 1.
The average grain diameter of the ceramsite is 20 mm.
Wherein the wood powder is a mixture of cypress branch powder and wood chips in a weight ratio of 3: 1. The mesh number of the cypress branch powder is 100 meshes.
The wood chips need to be pretreated, and the pretreatment method comprises the following steps:
(1) selecting raw materials: selecting the wood chips produced by processing in a wood processing field.
(2) Crushing and screening: and (2) crushing the wood chips obtained in the step (1) to obtain wood chip powder with the particle size of 2.5 mm.
(3) And (3) drying: drying the wood chips at the drying temperature of 80 ℃ for 25 min.
(4) Medium-temperature pyrolysis: putting the wood chips into a closed pyrolysis furnace, adding nitrogen for pyrolysis protection, controlling the temperature at 310 ℃ and the pyrolysis time at 1 h.
(5) And (3) post-treatment: and (4) taking out the wood chips treated in the step (4), and insulating air to cool to 26 ℃ to obtain the pretreated wood chips.
Comparative example 1
An aerated brick sold by Jinjixuan building materials Co., Ltd, in Fushan City, was used as comparative example 1.
Comparative example 2
An environment-friendly aerated brick is different from the aerated brick in the embodiment 1 in that: wood flour was not used.
Comparative example 3
An environment-friendly aerated brick is different from the aerated brick in the embodiment 1 in that: the aerated brick comprises the following components in parts by mass:
38 portions of cement
40 portions of fly ash
Lime 24.5 parts
26.5 parts of gypsum
10 portions of ceramsite
40 parts of wood powder
1 part of aluminum powder.
Performance test
Examples 1 to 9 and comparative examples 1 to 3 were sampled in accordance with the following tests, and the samples thus obtained were designated as samples 1 to 12.
Test 1
The compressive strength (Mpa) of samples 1 to 12 having a volume of 100mm x 100mm was measured according to GB11969-2008 "method for autoclaved aerated concrete test" and the data was recorded to table 2.
Test 2
The sound insulation (dB) of samples 1-12 was measured according to GB/T19889.1-2005 Acoustic-building and construction component Sound insulation measurement and the data is reported in Table 2.
Table 2 samples 1-12 were subjected to the test data of runs 1-2.
Figure BDA0002562399220000121
Wood flour of sample 1 adopts the saw-dust, what wood flour of sample 2 adopted is bark powder, what sample 3 adopted is chinese parasol branch powder, wood flour of sample 5 adopts chinese parasol branch powder and saw-dust to prepare with specific weight ratio by compounding, can see from the data in table 2, sample 1, sample 2 and sample 3's sound insulation volume is very close, but sample 5's sound insulation volume is bigger than sample 1, sample 2 and sample 3's sound insulation volume, so can know, the interpolation of saw-dust is favorable to reinforcing aerated brick's structural strength and sound absorption performance, simultaneously, branch powder and saw-dust play the synergism, play the effect of further reinforcing to aerated brick's structural strength.
The wood flour of the sample 4 is a mixture of the phoenix tree branch powder and the sawdust in a weight ratio of 1:1, the wood flour of the sample 5 is a mixture of the phoenix tree branch powder and the sawdust in a weight ratio of 2:1, although the sample 4 and the sample 5 are mixed by the phoenix tree branch powder and the sawdust, when the mixing ratio of the phoenix tree branch powder and the sawdust is not within the range of the ratio limited by the application, the dispersibility and the adsorption effect of the prepared wood flour are inferior to those of the wood flour of the application, so that the wood flour is prepared by compounding the branch powder and the sawdust in a weight ratio within a specific range, the wood flour can be uniformly mixed in a raw material system for preparing the air-entrapping bricks, and the sound absorption effect and the structural strength of the air-entrapping bricks are further improved.
The wood chips of the sample 5 are not pretreated, the wood chips of the sample 6 are pretreated, and the sound insulation amount of the sample 6 is larger than that of the sample 5, which shows that the pretreated wood chips form more channels inside, so that the adsorption effect is enhanced, and the sound absorption performance of the aerated brick can be enhanced. In addition, lignin in the wood chips is beneficial to improving the bonding performance between the wood chips and other components, and is beneficial to further enhancing the overall sound absorption performance of the aerated brick.
The branch powder of sample 6 is direct to be smashed by the rubbing crusher, and the branch powder of sample 7 is dried earlier and is less than 2.6% to moisture content, then smashes the branch again, and the data from table 2 can see that the sound absorption performance of sample 7 is better than sample 6's sound absorption performance, and this shows, prepares branch powder through specific method, can reduce the moisture content of branch powder for branch powder is more loose, thereby is favorable to promoting the dispersibility of branch powder.
The sample 10 is a commercially available aerated brick, and as can be seen from table 2, the compressive strength of the sample 10 is lower than that of the sample 1, and the sound insulation of the sample 10 is also lower than that of the sample 1, so that the aerated brick prepared by the method has good structural strength and sound absorption performance.
While wood flour was not used for sample 11, wood flour was used for sample 1, it can be seen from the data in table 2 that the sound insulation and compressive strength of sample 11 are less than those of sample 1. Therefore, the wood powder is favorable for enhancing the structural strength of the aerated brick, and the fibers have good adsorption performance, so that the sound absorption performance of the aerated brick is favorably enhanced, the reflection path of sound is reduced, and the wood powder, the ceramsite, the fly ash, the lime and the cement are compounded according to a specific mass part range, so that the prepared aerated brick has a good sound absorption effect on the premise of good structural strength.
Compared with sample 1, although the components of sample 12 and sample 1 for preparing the aerated brick are the same, the mass parts of the fly ash, the ceramsite and the wood powder of sample 12 are not in the range of the application, and the compressive strength and the sound absorption performance of the prepared aerated brick are poorer than those of the application. The data in table 2 show that the compressive strength and the sound insulation performance of the sample 8 are the best, and therefore, the aerated brick prepared by compounding the components according to the specific parts by mass can be beneficial to improving the sound absorption effect of the aerated brick under the condition that the aerated brick has good structural strength, and can be applied to buildings with high sound insulation requirements.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. An environmental protection aerated brick which is characterized in that: the adhesive comprises the following components in parts by mass:
30-40 parts of cement
50-70 parts of fly ash
20-25 parts of lime
19-28 parts of gypsum
10-18 parts of ceramsite
20-30 parts of wood powder
0.5-1 part of aluminum powder.
2. The environment-friendly aerated brick according to claim 1, characterized in that: the wood powder comprises one or more of wood chips, branch powder and bark powder.
3. The environment-friendly aerated brick according to claim 1, characterized in that: the wood powder is a mixture of wood chips and branch powder in a weight ratio of (2-3) to 1.
4. The environment-friendly aerated brick according to claim 3, characterized in that: the wood chips are required to be pretreated before being prepared into wood powder, and the pretreatment method comprises the following steps:
(1) selecting raw materials: selecting sawdust generated by processing in a wood processing field;
(2) crushing and screening: crushing the wood chips obtained in the step (1) to obtain wood chip powder with the particle size of 2-3 mm;
(3) and (3) drying: drying the wood chips at a drying temperature of 75-85 ℃ for 20-30 min;
(4) medium-temperature pyrolysis: putting the wood chips into a closed pyrolysis furnace, adding nitrogen for pyrolysis protection, controlling the temperature at 300 ℃ and 330 ℃ and the pyrolysis time at 0.5-1.5 h;
(5) and (3) post-treatment: and (4) taking out the wood chips treated in the step (4), and insulating air to cool to 25-28 ℃, thus obtaining the pretreated wood chips.
5. The environment-friendly aerated brick according to claim 3, characterized in that: the preparation method of the branch powder comprises the following steps: drying the branches until the water content is less than or equal to 2.6%, and then crushing the branches into 80-100 meshes to obtain the branch powder.
6. The environment-friendly aerated brick according to claim 5, characterized in that: the branch powder adopts branches which are one or two of branches of Chinese parasol trees and cypress trees which are abandoned by intermediate cutting.
7. The environment-friendly aerated brick according to any one of claims 1 to 6, wherein the aerated brick comprises the following components in parts by mass:
34-40 parts of cement
62-70 parts of fly ash
24-25 parts of lime
25-28 parts of gypsum
15-18 parts of ceramsite
25-30 parts of wood powder
0.9-1 part of aluminum powder.
8. The environment-friendly aerated brick according to any one of claims 1 to 6, wherein: the aerated brick comprises the following components in parts by mass:
38 portions of cement
68 portions of fly ash
Lime 24.5 parts
26.5 parts of gypsum
17 parts of ceramsite
29 parts of wood powder
1 part of aluminum powder.
9. A preparation method for preparing the environment-friendly aerated brick as claimed in any one of claims 1 to 6, which is characterized by comprising the following steps: the method comprises the following steps:
s1, preparing a cementing slurry: mixing lime, cement and gypsum in corresponding parts by mass, and stirring for 10-15 minutes to prepare a cementing slurry;
s2, preparation of mixture a: mixing and stirring the ceramsite and the cementing slurry prepared in the step S1, wherein the stirring temperature is 30-37 ℃, then adding the corresponding mass part of fly ash, stirring for 15-25min, adding the corresponding mass part of wood powder while stirring, heating to 45-50 ℃ after the wood powder is completely added, and stirring for 2-3min to prepare a mixture A;
s3, preparing a gas former solution: adding water and aluminum powder according to the weight ratio of the water to the aluminum powder of (25-30) to 1 for diluting and stirring for 2-3 minutes to obtain a gas former solution;
s4, preparing slurry foam concrete: adding the foaming agent solution prepared in the step S2 into the mixture A, and stirring for 0.5-1min to obtain slurry foam concrete;
s5, casting and forming: immediately pouring the slurry foam concrete obtained in the step S3 into a mould, and sending the mould into a hot chamber for standing and curing to obtain a formed aerated concrete module blank;
s6, cutting the blank: the formed aerated concrete module blank obtained in the step S4 is subjected to hot-chamber standing maintenance and reaches the cutting strength, the mould frame is removed, and cutting is carried out according to the preset size, so as to obtain a semi-formed aerated brick;
s7, steam pressure curing: and (4) feeding the semi-formed aerated brick prepared in the step (S6) into a still kettle, and sequentially carrying out vacuumizing, steam adding, temperature and pressure raising, constant temperature and pressure raising, temperature and pressure lowering, and pressure lowering to complete the autoclaved curing process to obtain the aerated brick.
10. The preparation method of the environment-friendly aerated brick according to claim 9, characterized by comprising the following steps: in step S5, the temperature of concrete pouring is 36-40 ℃.
CN202010619095.0A 2020-06-30 2020-06-30 Environment-friendly aerated brick and preparation method thereof Active CN111704430B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105060930A (en) * 2015-08-19 2015-11-18 湖北鼎德新型建材科技有限公司 Autoclaved aerated concrete block and preparation method
CN105732088A (en) * 2016-02-29 2016-07-06 欧士玺 Novel porous brick and preparation method thereof
CN106187281A (en) * 2016-07-12 2016-12-07 绍兴职业技术学院 A kind of steaming-free air-adding brick utilizing building waste to prepare and preparation method thereof
CN108264320A (en) * 2018-01-31 2018-07-10 四川大学 A kind of B06 grades of autoclave aerated concrete building block and preparation method thereof
CN108793919A (en) * 2018-07-18 2018-11-13 合肥梵腾环保科技有限公司 A kind of composite heat insulation block and preparation method thereof
EP3640224A1 (en) * 2015-10-29 2020-04-22 STO SE & Co. KGaA Binder composition with reduced efflorescence and favourable co2 balance

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105060930A (en) * 2015-08-19 2015-11-18 湖北鼎德新型建材科技有限公司 Autoclaved aerated concrete block and preparation method
EP3640224A1 (en) * 2015-10-29 2020-04-22 STO SE & Co. KGaA Binder composition with reduced efflorescence and favourable co2 balance
CN105732088A (en) * 2016-02-29 2016-07-06 欧士玺 Novel porous brick and preparation method thereof
CN106187281A (en) * 2016-07-12 2016-12-07 绍兴职业技术学院 A kind of steaming-free air-adding brick utilizing building waste to prepare and preparation method thereof
CN108264320A (en) * 2018-01-31 2018-07-10 四川大学 A kind of B06 grades of autoclave aerated concrete building block and preparation method thereof
CN108793919A (en) * 2018-07-18 2018-11-13 合肥梵腾环保科技有限公司 A kind of composite heat insulation block and preparation method thereof

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