Thermal insulation aerated brick and its preparation method

Abstract

The application relates to the field of building materials, in particular to a thermal insulation aerated brick and a preparation method thereof. The thermal insulation aerated brick comprises the following raw materials in parts by weight: cement 20-30 parts; lime 30-40 parts; gypsum 3-6 parts; fly ash 110-130 parts; aluminum powder 0.3-0.5 parts; dispersant 0.3-0.6 parts; mixed water reducing agent 0.5-0.7 parts; grinding aid 0.1-0.3 parts; and water 70-80 parts. The mixed water reducing agent is formed by mixing rosin thermopolymer air entraining agent, naphthalene series water reducing agent and polycarboxylic acid water reducing agent, and the weight ratio of the rosin thermopolymer air entraining agent, the naphthalene series water reducing agent and the polycarboxylic acid water reducing agent is (5-6):(1.5-2.5):(4.5-5.5). The application has the characteristics of improving the thermal insulation performance of the aerated brick.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building materials, in particular to a thermal insulation aerated brick and a preparation method thereof. BACKGROUND

[0002] The aerated brick is a new type of wall material made of stone powder, cement and lime as main raw materials, through raw material preparation, pouring and cutting forming, and high-pressure steam curing, mainly used for non-load-bearing wall masonry and frame structure filling.

[0003] One of the main advantages of the aerated brick is its lightweight. Due to the action of the gas-forming agent, a large number of small pores are formed inside the brick, which reduces the density of the brick and thus reduces the weight, making the aerated brick more convenient to use in construction and reducing the labor intensity of construction. Moreover, due to the pore structure inside the aerated brick, it has good thermal insulation and heat insulation performance, making the aerated brick have a good application prospect in building thermal insulation and energy saving.

[0004] However, for some places with higher requirements for thermal insulation, the thermal insulation effect of the existing aerated brick is still difficult to meet the requirements, and the thermal insulation performance needs to be improved. SUMMARY

[0005] In order to improve the thermal insulation performance of the aerated brick, the present application provides a thermal insulation aerated brick and a preparation method thereof.

[0006] In a first aspect, the present application provides a thermal insulation aerated brick, which adopts the following technical solution:

[0007] A thermal insulation aerated brick comprises the following raw materials by weight:

[0008] Cement 20-30 parts;

[0009] Lime 30-40 parts;

[0010] Gypsum 3-6 parts;

[0011] Fly ash 110-130 parts;

[0012] Aluminum powder 0.3-0.5 parts;

[0013] Dispersing agent 0.3-0.6 parts;

[0014] Mixed water reducing agent 0.5-0.7 parts;

[0015] Grinding aid 0.1-0.3 parts;

[0016] Water 70-80 parts;

[0017] The mixed water reducing agent is formed by mixing rosin hot polymer air-entraining water reducing agent, naphthalene series water reducing agent and polycarboxylic acid water reducing agent, and the weight ratio of the rosin hot polymer air-entraining water reducing agent, the naphthalene series water reducing agent and the polycarboxylic acid water reducing agent is (5-6) : (1.5-2.5) : (4.5-5.5).

[0018] By adopting the above technical scheme, the dispersant can promote the uniform dispersion of the aluminum powder to achieve the effect of uniform gas evolution, so that the internal pore size distribution of the aerated brick is uniform, and the pores are fine and dense, thereby improving the heat absorption rate of the aerated brick, improving the thermal insulation performance of the aerated brick, and reducing the dry density of the aerated brick, which is beneficial to improve the strength of the aerated brick; at the same time, under the action of the grinding aid, the distribution of cement particles in the concrete can be improved and the hydration dynamics of the cement can be stimulated, which is beneficial to improve the strength of the aerated brick; secondly, the mixed water reducing agent is formed by mixing the rosin hot polymer air-entraining water reducing agent, the naphthalene series water reducing agent and the polycarboxylic acid water reducing agent, under the mixing action of the three kinds of water reducing agents, the fluidity and plasticity of the concrete are further increased, which is beneficial to the formation of the concrete embryo, so as to realize the improvement of the uniformity and strength of the aerated brick, thereby further strengthening the heat insulation effect and the anti-permeability and anti-frost performance of the aerated brick; and under the interaction of the three, the heat release rate of the concrete condensation is slowed down, which effectively delays the condensation of the concrete, so as to promote the uniform dispersion and stability of the concrete raw materials, thereby strengthening the internal pore structure and density of the aerated brick, which is beneficial to further improve the thermal insulation performance and the anti-permeability and anti-frost performance of the aerated brick; secondly, the mixed water reducing agent can also reduce the alkalinity of the concrete, thereby improving the acid corrosion resistance of the aerated brick.

[0019] Preferably, the preparation raw materials of the rosin hot polymer air-entraining water reducing agent include rosin powder, tyrosine, sodium hydroxide and concentrated sulfuric acid, and the weight ratio of the rosin powder, the tyrosine, the sodium hydroxide and the concentrated sulfuric acid is (6-7) : (4-5) : (0.3-0.5) : (0.1-0.3).

[0020] By adopting the above technical scheme, under the catalytic action of the concentrated sulfuric acid, the esterification polymerization reaction of the rosin powder and the tyrosine occurs, and then under the alkaline condition of the sodium hydroxide, the performance of the rosin hot polymer air-entraining water reducing agent is adjusted, which is beneficial to the synthesis of the rosin hot polymer air-entraining water reducing agent, thereby promoting the formation of bubbles by the rosin hot polymer air-entraining water reducing agent, increasing the porosity of the mortar, and improving the uniformity and strength of the aerated brick, so as to strengthen the heat insulation effect and the anti-permeability and anti-frost performance of the aerated brick; and under the action of the tyrosine, the rosin hot polymer air-entraining water reducing agent can also reduce the heat release rate of the concrete condensation and the alkalinity of the concrete, so as to achieve the effects of retarding and acid corrosion resistance, thereby promoting the uniform dispersion and stability of the concrete raw materials, further improving the density and strength of the aerated brick, and improving the acid corrosion resistance and durability of the aerated brick.

[0021] Preferably, the naphthalene series water reducing agent is a naphthalene formaldehyde sodium sulfonate type water reducing agent.

[0022] By adopting the above technical scheme, the naphthalene formaldehyde sodium sulfonate type water reducing agent has good mixing effect with the rosin hot polymer air entraining water reducing agent and the polycarboxylic acid water reducing agent, so that the fluidity and plasticity of the concrete are further improved, thereby further strengthening the heat insulation effect and the anti-permeability and anti-frost performance of the aerated brick; and the naphthalene formaldehyde sodium sulfonate type water reducing agent is conducive to promoting the retarding effect of the rosin hot polymer air entraining water reducing agent, so as to strengthen the retarding effect of the mixed water reducing agent, thereby strengthening the internal pore structure and the compactness of the aerated brick, and being conducive to further improving the durability, heat preservation performance, and anti-permeability and anti-frost performance of the aerated brick.

[0023] Preferably, the polycarboxylic acid water reducing agent is a polyether type polycarboxylic acid water reducing agent.

[0024] By adopting the above technical scheme, the polyether type polycarboxylic acid water reducing agent has good mixing effect with the rosin hot polymer air entraining water reducing agent and the naphthalene series water reducing agent, which is conducive to further strengthening the fluidity and plasticity of the concrete, so as to further improve the uniform compactness and strength of the aerated brick, thereby further strengthening the heat insulation effect and the anti-permeability and anti-frost performance of the aerated brick; and the polyether type polycarboxylic acid water reducing agent is conducive to further promoting the retarding and acid corrosion resistance of the mixed water reducing agent, thereby further improving the anti-permeability, anti-frost performance, and acid corrosion resistance of the aerated brick.

[0025] Preferably, the fly ash is activated fly ash, and the preparation raw material of the activated fly ash is fly ash and an acid activator, and the weight ratio of the fly ash to the acid activator is (120-140):(10-20).

[0026] By adopting the above technical scheme, under the action of the acid activator, the surface of the fly ash is corroded to form a new surface and active points, thereby obtaining the activated fly ash, which is conducive to improving the early reaction rate of the fly ash, and thereby being conducive to the synthesis of the aerated brick.

[0027] Preferably, the grinding aid is ethylene glycol.

[0028] By adopting the above technical scheme, the ethylene glycol can well improve the distribution of cement particles and stimulate the hydration dynamics, so as to improve the early and late strength of the aerated brick, and the ethylene glycol can also reduce the drying shrinkage of the aerated brick and delay the time of crack initiation, thereby further improving the durability of the aerated brick.

[0029] Preferably, the dispersing agent is sodium hexametaphosphate.

[0030] In a second aspect, the application provides a preparation method of the heat-insulating aerated brick, which adopts the following preparation scheme:

[0031] A preparation method of a thermal insulation aerated brick, comprising the following steps:

[0032] First, cement, lime, gypsum, fly ash and water are mixed and stirred uniformly for 10-15 min to prepare a mixed slurry; second, aluminum powder is added and the temperature is adjusted to 50-60℃, and the reaction is carried out for 3-5 min; third, a dispersing agent, a mixed water reducing agent and a grinding aid are added and stirred uniformly to form a concrete slurry; then, the concrete slurry is injected into a mold and placed at 45-55℃ for 2-3 h to form an embryo; finally, the embryo is demolded and cut into a brick embryo, and the brick embryo is subjected to autoclaved curing treatment at a temperature of 170-190℃ and a pressure of 0.8-1.0 MPa for 8-10 h to obtain the thermal insulation aerated brick.

[0033] By adopting the above technical scheme, after the cement, lime, gypsum, fly ash and water are mixed, the aluminum powder is added and reacted at 50-60℃, which is conducive to promoting the formation of bubbles, thereby improving the porosity of the aerated brick and further improving the thermal insulation performance of the aerated brick; at the same time, the concrete slurry is placed at 45-55℃ to form an embryo, which is conducive to promoting the occurrence of hydration reaction in the concrete slurry, thereby improving the early strength of the aerated brick.

[0034] Preferably, the preparation method of the mixed water reducing agent is as follows: the rosin hot polymer air-entraining water reducing agent, the naphthalene series water reducing agent and the polycarboxylic acid water reducing agent are mixed and stirred, heated to 60-70℃, and mixed and stirred for 10-20 min to obtain the mixed water reducing agent.

[0035] By adopting the above technical scheme, by heating and stirring, the mutual fusion among the rosin hot polymer air-entraining water reducing agent, the naphthalene series water reducing agent and the polycarboxylic acid water reducing agent is facilitated, so as to strengthen the mutual promotion among them, thereby facilitating the improvement of the fluidity and plasticity of the concrete by the mixed water reducing agent, and strengthening the retarding and acid corrosion resistance of the mixed water reducing agent.

[0036] Preferably, the preparation method of the rosin hot polymer air-entraining water reducing agent is as follows: the rosin powder, tyrosine and concentrated sulfuric acid are stirred and mixed, and slowly heated to 75-85℃, and reacted for 4-6 h; then, sodium hydroxide is added and heated to 95-105℃, and stirred and reacted for 2-3 h to obtain the rosin hot polymer air-entraining water reducing agent.

[0037] Preferably, the concentrated sulfuric acid is 98% concentrated sulfuric acid.

[0038] By adopting the technical scheme, under the catalysis of concentrated sulfuric acid at 75-85 DEG C, the esterification reaction of the carboxyl group of the rosin powder and the hydroxyl group of the tyrosine is promoted to generate lipids; then, under the stirring reaction at 95-105 DEG C, the neutralization effect of sodium hydroxide is fully played, so that the generation of the rosin hot polymer air entraining water reducing agent is promoted, the reaction rate is improved, and the rosin hot polymer air entraining water reducing agent with stable structure and strong surface performance is obtained.

[0039] Preferably, the preparation method of the activated fly ash comprises the following steps: mixing and stirring the fly ash and the acid activator, heating to 150-180 DEG C, reacting for 3-5 h, filtering and collecting the filter body after the reaction, and drying the filter body to obtain the activated fly ash.

[0040] Preferably, the acid activator is a 0.25 mol / L sulfuric acid solution.

[0041] By adopting the technical scheme, the activated fly ash prepared by the preparation method has the characteristics of strong surface performance, which is beneficial to promote the early reaction rate of the activated fly ash, and further beneficial to the synthesis of the aerated brick and improve the early strength of the aerated brick.

[0042] In summary, the present application has at least one of the following beneficial technical effects:

[0043] 1. Under the action of the dispersant, the dispersion of the aluminum powder is promoted, the internal pore size distribution of the aerated brick is uniform, and the pores are small and dense, thereby improving the heat absorption rate of the aerated brick, improving the thermal insulation performance of the aerated brick, reducing the dry density of the aerated brick, and improving the strength of the aerated brick, and under the action of the grinding aid, the distribution of the cement particles in the concrete is improved and the hydration dynamics of the cement is excited, thereby improving the strength of the aerated brick and improving the durability of the aerated brick, and under the action of the mixed water reducing agent, the fluidity and plasticity of the concrete are improved, the uniformity and strength of the aerated brick are improved, the thermal insulation effect, impermeability and frost resistance of the aerated brick are further strengthened, and under the mixing effect of the mixed water reducing agent, the heat release rate and alkalinity of the concrete are reduced, the setting is slowed down and the acid corrosion resistance is improved, thereby promoting the uniform dispersion and stability of the concrete raw materials, further improving the density and strength of the aerated brick, and improving the acid corrosion resistance and durability of the aerated brick;

[0044] 2. The application preferably uses tyrosine and rosin powder as the main synthetic raw material of rosin hot polymer air entraining water reducing agent, so that the rosin hot polymer air entraining water reducing agent containing tyrosine not only realizes the increase of the fluidity and plasticity of concrete, but also achieves the effects of retarding and acid corrosion resistance, thereby promoting the uniform dispersion and stability of concrete raw materials, further improving the density and strength of aerated bricks, and further strengthening the heat insulation effect, impermeability, frost resistance and acid corrosion resistance of aerated bricks, and thus realizing the improvement of the durability of aerated bricks.

[0045] 3. The mixed water reducing agent prepared by mixing the rosin hot polymer air entraining water reducing agent, the naphthalene formaldehyde sodium sulfonate type water reducing agent and the polyether type polycarboxylic acid water reducing agent further increases the fluidity and plasticity of concrete, which is beneficial to the formation of concrete embryo, realizes the improvement of the uniformity and strength of aerated bricks, and further strengthens the heat insulation effect, impermeability and frost resistance of aerated bricks. Under the interaction of the three, the mixed water reducing agent effectively delays the coagulation of concrete, slows down the heat release rate of concrete, promotes the uniform dispersion and stability of concrete raw materials, thereby strengthening the internal pore structure and density of aerated bricks, and further improving the heat insulation performance, impermeability and frost resistance of aerated bricks. In addition, the mixed water reducing agent can also effectively reduce the alkalinity of concrete, thereby improving the acid corrosion resistance of aerated bricks. DETAILED DESCRIPTION

[0046] The application will be further described in detail below in combination with examples.

[0047] The naphthalene type water reducing agent is FDN-C naphthalene type water reducing agent.

[0048] The polyether type polycarboxylic acid water reducing agent is PC-303 polyether type polycarboxylic acid water reducing agent.

[0049] Preparation Example

[0050] Preparation Example 1

[0051] Preparation method of rosin hot polymer air entraining water reducing agent:

[0052] 6 kg of rosin powder, 4 kg of tyrosine and 0.1 kg of concentrated sulfuric acid were weighed and stirred and mixed in a reaction kettle, then slowly heated to 75℃ at a rate of 5℃ / min, and stirred for 4h. Then, 0.3 kg of sodium hydroxide was added, and the temperature was raised to 95℃, and stirred for 2h to obtain the rosin hot polymer air entraining water reducing agent.

[0053] Preparation Example 2

[0054] Preparation method of rosin hot polymer air entraining water reducing agent:

[0055] Take 7 kg of rosin powder, 5 kg of tyrosine and 0.3 kg of concentrated sulfuric acid in the reaction kettle and stir to mix, then slowly heat to 85℃ at a rate of 5℃ / min, and stir for 6h; then, add 0.5 kg of sodium hydroxide, and heat to 105℃, stir for 3h, to obtain rosin thermopolymer air-entraining water reducer.

[0056] Preparation Example 3

[0057] Preparation method of rosin thermopolymer air-entraining water reducer:

[0058] Take 7 kg of rosin powder, 5 kg of phenol and 0.3 kg of concentrated sulfuric acid in the reaction kettle and stir to mix, then slowly heat to 85℃ at a rate of 5℃ / min, and stir for 6h; then, add 0.5 kg of sodium hydroxide, and heat to 105℃, stir for 3h, to obtain rosin thermopolymer air-entraining water reducer.

[0059] Preparation Example 4

[0060] Preparation method of mixed water reducer:

[0061] Take 5 kg of rosin thermopolymer air-entraining water reducer of preparation example 1, 1.5 kg of FDN-C naphthalene water reducer and 4.5 kg of PC-303 polyether type polycarboxylic acid water reducer in the reaction kettle and mix evenly, heat to 60℃, mix and stir for 10 min, to obtain mixed water reducer.

[0062] Preparation Example 5

[0063] Preparation method of mixed water reducer:

[0064] Take 6 kg of rosin thermopolymer air-entraining water reducer of preparation example 2, 2.5 kg of FDN-C naphthalene water reducer and 5.5 kg of PC-303 polyether type polycarboxylic acid water reducer in the reaction kettle and mix evenly, heat to 70℃, mix and stir for 20 min, to obtain mixed water reducer.

[0065] Preparation 6

[0066] Preparation method of mixed water reducer:

[0067] Take 6 kg of rosin thermopolymer air-entraining water reducer of preparation example 3, 2.5 kg of FDN-C naphthalene water reducer and 5.5 kg of PC-303 polyether type polycarboxylic acid water reducer in the reaction kettle and mix evenly, heat to 70℃, mix and stir for 20 min, to obtain mixed water reducer.

[0068] Preparation Example 7

[0069] Preparation method of activated fly ash:

[0070] Take 120 kg of fly ash and 10 kg of 0.25 mol / L sulfuric acid solution in the reaction kettle, heat to 150℃, and stir for 3h, filter the solid after the reaction is completed, then dry in a 50℃ drying oven for 1h, to obtain activated fly ash.

[0071] Preparation Example 8

[0072] Method for preparing activated fly ash:

[0073] Take 140 kg of fly ash and 20 kg of 0.25 mol / L sulfuric acid solution in the reaction kettle, heat to 180℃, and stir for 5h, filter the solid after the reaction is completed, then dry in a 50℃ drying oven for 1h, to obtain activated fly ash.

[0074] Example

[0075] Example 1

[0076] Preparation of a thermal insulation aerated brick:

[0077] First, mix 20 kg of cement, 30 kg of lime, 3 kg of gypsum, 110 kg of fly ash, and 70 kg of water, and stir for 10 min to obtain a mixed slurry; second, add 0.3 kg of aluminum powder, adjust the temperature to 50℃, and react for 3 min; third, add 0.3 kg of sodium hexametaphosphate, 0.5 kg of the mixed water reducing agent of Preparation Example 4, and 0.1 kg of ethylene glycol, and stir until uniform to form a concrete slurry; then, pour the concrete slurry into a mold, and let it stand at 45℃ for 2h to form a blank; finally, demold and cut the blank into brick blanks, and then place the brick blanks in an autoclave for autoclaving and curing treatment at a temperature of 170℃ and a pressure of 0.8 MPa for 8h to obtain a thermal insulation aerated brick.

[0078] Example 2

[0079] First, mix 30 kg of cement, 40 kg of lime, 6 kg of gypsum, 130 kg of fly ash, and 80 kg of water, and stir for 15 min to obtain a mixed slurry; second, add 0.5 kg of aluminum powder, adjust the temperature to 55℃, and react for 5 min; third, add 0.6 kg of sodium hexametaphosphate, 0.7 kg of the mixed water reducing agent of Preparation Example 5, and 0.3 kg of ethylene glycol, and stir until uniform to form a concrete slurry; then, pour the concrete slurry into a mold, and let it stand at 55℃ for 3h to form a blank; finally, demold and cut the blank into brick blanks, and then place the brick blanks in an autoclave for autoclaving and curing treatment at a temperature of 190℃ and a pressure of 1.0 MPa for 10h to obtain a thermal insulation aerated brick.

[0080] Example 3

[0081] Firstly, 25 kg of cement, 35 kg of lime, 5 kg of gypsum, 120 kg of fly ash and 75 kg of water were mixed and stirred uniformly for 15 min to prepare a mixed slurry; secondly, 0.4 kg of aluminum powder was added, the temperature was adjusted to 55 ℃, and the reaction was carried out for 3 min; thirdly, 0.5 kg of sodium hexametaphosphate, 0.6 kg of the mixed water reducing agent in Preparation Example 5 and 0.2 kg of ethylene glycol were added and stirred uniformly to form a concrete slurry; then, the concrete slurry was injected into a mold, and the embryo was formed by standing at 50 ℃ for 2 h; finally, the embryo was demolded and cut into brick embryos, and the brick embryos were placed in an autoclave for autoclaved curing treatment at a temperature of 180 ℃ and a pressure of 0.9 MPa for 8 h to obtain the thermal insulation aerated brick.

[0082] Example 4

[0083] Firstly, 25 kg of cement, 35 kg of lime, 5 kg of gypsum, 120 kg of fly ash and 75 kg of water were mixed and stirred uniformly for 15 min to prepare a mixed slurry; secondly, 0.4 kg of aluminum powder was added, the temperature was adjusted to 55 ℃, and the reaction was carried out for 3 min; thirdly, 0.5 kg of sodium hexametaphosphate, 0.6 kg of the mixed water reducing agent in Preparation Example 5 and 0.2 kg of ethylene glycol were added and stirred uniformly to form a concrete slurry; then, the concrete slurry was injected into a mold, and the embryo was formed by standing at 50 ℃ for 2 h; finally, the embryo was demolded and cut into brick embryos, and the brick embryos were placed in an autoclave for autoclaved curing treatment at a temperature of 180 ℃ and a pressure of 0.9 MPa for 8 h to obtain the thermal insulation aerated brick.

[0084] Example 5

[0085] The difference between this example and Example 3 is that the fly ash is specifically the activated fly ash prepared in Preparation Example 7.

[0086] Example 6

[0087] The difference between this example and Example 3 is that the fly ash is specifically the activated fly ash prepared in Preparation Example 8.

[0088] Comparative Example

[0089] Comparative Example 1

[0090] The difference between this comparative example and Example 3 is that sodium hexametaphosphate is not added.

[0091] Comparative Example 2

[0092] The difference between this comparative example and Example 3 is that ethylene glycol is not added.

[0093] Comparative Example 3

[0094] The difference between this comparative example and Example 3 is that the mixed water reducing agent is not added.

[0095] Comparative Example 4

[0096] The difference between this comparative example and Example 3 is that the mixed water reducing agent is not added, and 0.4 kg of the rosin hot polymer air-entraining water reducing agent prepared in Preparation Example 2 and 0.2 kg of FDN-C naphthalene series water reducing agent are used to replace the mixed water reducing agent.

[0097] Comparative Example 5

[0098] The difference between this comparative example and Example 3 is that the mixed water reducing agent is not added, and 0.3 kg of the rosin hot polymer air-entraining water reducing agent prepared in Preparation Example 2 and 0.3 kg of PC-303 polyether type polycarboxylic acid water reducing agent are used to replace the mixed water reducing agent.

[0099] Comparative Example 6

[0100] The difference between this comparative example and Example 3 is that the mixed water reducing agent is not added, and 0.2 kg of FDN-C naphthalene series water reducing agent and 0.4 kg of PC-303 polyether type polycarboxylic acid water reducing agent are used to replace the mixed water reducing agent.

[0101] Performance test data

[0102] Test 1: According to JC 275-1980 (1996) “Test method for thermal conductivity of aerated concrete”, aerated bricks prepared in Examples 1-6 and Comparative Examples 1-6 of the present application are made into test pieces, and the thermal conductivity of the test pieces is tested according to the standard. The test results are shown in Table 1.

[0103] Test 2: According to the compressive strength test in GB / T 11969-2008 “Test method for performance of autoclaved aerated concrete”, aerated bricks prepared in Examples 1-6 and Comparative Examples 1-6 of the present application are made into test pieces, and the compressive strength of the test pieces is tested according to the standard. The test results are shown in Table 1.

[0104] Test 3: According to the compressive strength test in GB / T 11969-2008 “Test method for performance of autoclaved aerated concrete”, aerated bricks prepared in Examples 1-6 and Comparative Examples 1-6 of the present application are made into test pieces, and then the test pieces are subjected to water immersion treatment, the water temperature is 25℃, the immersion time is 15d, then the test pieces are taken out, and at room temperature, the compressive strength of the test pieces is tested according to GB / T 11969-2008 “Test method for performance of autoclaved aerated concrete”, and the water immersion compressive strength decay rate is calculated according to (compressive strength-water immersion compressive strength) / compressive strength. The test results are shown in Table 1.

[0105] Test 4: According to the compressive strength test in GB / T 11969-2008 "Autoclaved Aerated Concrete Performance Test Method", the aerated bricks prepared in Examples 1-6 and Comparative Examples 1-6 were made into test pieces, and then the test pieces were placed in a 20wt% sulfuric acid solution for acid immersion treatment, the temperature of the sulfuric acid solution was 25℃, the soaking time was 72h, then the test pieces were taken out, and the compressive strength of the test pieces was tested at room temperature according to GB / T 11969-2008 "Autoclaved Aerated Concrete Performance Test Method", and the acid immersion compressive strength decay rate was calculated according to (compressive strength-acid immersion compressive strength) / compressive strength, and the test results are shown in Table 1.

[0106] Table 1 Performance test result summary table

[0107]

[0108]

[0109] It can be seen from the combination of Example 3 and Comparative Examples 1-3 and the data in Table 1 that the simultaneous addition of sodium hexametaphosphate, ethylene glycol and mixed water reducing agent is beneficial to significantly improve the thermal insulation performance, impermeability and acid corrosion resistance of the aerated brick, and significantly enhance the strength of the aerated brick, thereby facilitating the improvement of the durability of the aerated brick. Among them, sodium hexametaphosphate has a greater impact on the strength and thermal insulation performance, impermeability of the aerated brick, ethylene glycol has a greater promoting effect on the enhancement of the strength and impermeability of the aerated brick; the mixed water reducing agent has a dominant role in improving the acid corrosion resistance of the aerated brick, and also has a significant promoting effect on the strength and thermal insulation performance and impermeability of the aerated brick, therefore, the combined action of sodium hexametaphosphate, ethylene glycol and mixed water reducing agent is needed to significantly enhance the strength and thermal insulation performance, impermeability and acid corrosion resistance of the aerated brick, thereby achieving the effect of effectively improving the durability of the aerated brick.

[0110] It can be seen from the combination of Example 3 and Comparative Examples 4-6 and the data in Table 1 that the mixed action of pine rosin hot polymer air entraining water reducing agent, FDN-C naphthalene series water reducing agent and PC-303 polyether type polycarboxylic acid water reducing agent is beneficial to significantly enhance the strength and thermal insulation performance, impermeability and acid corrosion resistance of the aerated brick, thereby effectively improving the durability of the aerated brick; therefore, the mixed water reducing agent made by mixing pine rosin hot polymer air entraining water reducing agent, FDN-C naphthalene series water reducing agent and PC-303 polyether type polycarboxylic acid water reducing agent is needed to significantly promote the performance of the aerated brick.

[0111] In combination with Example 3 and Example 4 and in combination with the data in Table 1, it can be seen that the compressive strength, the compressive strength after immersion in water and the compressive strength after immersion in acid of Example 4 are all lower than those of Example 3, and the thermal conductivity, the compressive strength attenuation rate after immersion in water and the compressive strength attenuation rate after immersion in acid of Example 4 are obviously higher, indicating that the rosin hot polymer air entraining water reducing agent prepared by using tyrosine has a better promoting effect on the improvement of the strength, the thermal insulation performance, the impermeability and the acid corrosion resistance of the aerated brick, thereby effectively improving the durability of the aerated brick.

[0112] In combination with Example 3 and Example 5-6 and in combination with the data in Table 1, it can be seen that the compressive strength, the compressive strength after immersion in water and the compressive strength after immersion in acid of Example 5-6 are all improved to a certain extent compared with those of Example 3, and the thermal conductivity, the compressive strength attenuation rate after immersion in water and the compressive strength attenuation rate after immersion in acid of Example 5-6 are lower, indicating that the preparation of the aerated brick by adding activated fly ash is conducive to further enhancing the strength of the aerated brick and better improving the thermal insulation performance, the impermeability and the acid corrosion resistance of the aerated brick, thereby being conducive to further improving the durability of the aerated brick.

[0113] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application, and those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An insulating aerated brick, characterized in that, The raw materials include cement 20-30 parts, lime 30-40 parts, gypsum 3-6 parts, fly ash 110-130 parts, aluminum powder 0.3-0.5 parts, dispersant 0.3-0.6 parts, mixed water reducing agent 0.5-0.7 parts, grinding aid 0.1-0.3 parts, and water 70-80 parts. The mixed water reducing agent is prepared by mixing pine rosin thermopolymer air-entraining agent, naphthalene series water reducing agent and polycarboxylic acid water reducing agent, and the weight ratio of the three is (5-6):(1.5-2.5):(4.5-5.5). The naphthalene series water reducing agent is naphthalene acid formaldehyde sulfonic acid sodium type water reducing agent. The polycarboxylic acid water reducing agent is polyether type polycarboxylic acid water reducing agent. The fly ash is activated fly ash, and the preparation raw materials of the activated fly ash are fly ash and acid activator, and the weight ratio of the two is (120-140):(10-20). The grinding aid is ethylene glycol. The application further discloses a preparation method of the insulating aerated brick. The application further discloses a preparation method of the mixed water reducing agent. The application further discloses a preparation method of the naphthalene series water reducing agent. The application further discloses a preparation method of the polycarboxylic acid water reducing agent. The application further discloses a preparation method of the fly ash. The application further discloses a preparation method of the grinding aid.

2. The heat-insulating aerated brick according to claim 1, wherein The application further discloses a preparation method of the insulating aerated brick.

3. The heat-insulating aerated brick according to claim 1, wherein The application further discloses a preparation method of the mixed water reducing agent.

4. The heat-insulating aerated brick according to claim 1, wherein The application further discloses a preparation method of the naphthalene series water reducing agent.

5. The insulating aerated block according to claim 1, wherein The application further discloses a preparation method of the polycarboxylic acid water reducing agent.

6. A method of producing an insulating aerated brick, characterized by, The application further discloses a preparation method of the fly ash. The application further discloses a preparation method of the grinding aid.

7. The method of producing an aerated brick according to claim 6, wherein The application further discloses a preparation method of the insulating aerated brick.

8. The method of producing an aerated brick according to claim 6, wherein The application further discloses a preparation method of the mixed water reducing agent.

9. The method of producing an aerated brick according to claim 6, wherein The application further discloses a preparation method of the naphthalene series water reducing agent. The application further discloses a preparation method of the polycarboxylic acid water reducing agent. The application further discloses a preparation method of the fly ash. The application further discloses a preparation method of the grinding aid. The application further discloses a preparation method of the insulating aerated brick.

Images