Low-carbon anti-crack micro-expansion gypsum plastering mortar and preparation method thereof

Abstract

The invention discloses low-carbon anti-crack micro-expansion gypsum plastering mortar and a preparation method thereof, and relates to the technical field of gypsum plastering mortar. The preparation method of the low-carbon anti-cracking micro-expansion gypsum plastering mortar comprises five steps of gypsum treatment, building solid waste reclaimed sand preparation, modified charcoal treatment, composite cementing material preparation and material mixing. According to the low-carbon anti-cracking micro-expansion gypsum plastering mortar and the preparation method thereof, in the aspect of raw materials, a composite cementing material can replace 70% of cement, carbon emission in the building industry can be effectively reduced, safety and stability of a building structure can be guaranteed, the service life of a building can be prolonged, the low-carbon anti-cracking micro-expansion gypsum plastering mortar is lower in carbon and environmentally friendly, and pollution to the environment is reduced; the addition of the modified charcoal can effectively improve the performance of the concrete, improve the durability and crack resistance of the concrete and reduce the carbon emission, and the addition of the additive can improve the durability and strength of the gypsum plastering mortar.

Description

Technical Field

[0001] The invention relates to the technical field of gypsum plaster mortar, in particular to low-carbon anti-cracking micro-expansion gypsum plaster mortar and a preparation method thereof. Background Art

[0002] Plaster mortar is a general term for a type of mortar that is applied to the building base for leveling or protection. Plaster mortar mainly includes cement plaster mortar and gypsum plaster mortar. Gypsum plaster mortar is widely used because of its advantages such as light weight, good thermal insulation performance, small shrinkage, fire resistance, "breathing" function and simple construction.

[0003] Some existing gypsum plaster mortars do not take carbon emissions into consideration, resulting in continuous carbon emissions, polluting the environment and slowing down the pace of global warming. Summary of the invention

[0004] The object of the present invention is to provide a low-carbon, crack-resistant, micro-expansion gypsum plaster mortar and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: low-carbon, crack-resistant, slightly expansive gypsum plaster mortar, comprising the following formula raw materials: 60-80 parts of gypsum, 30-40 parts of cement, 10-20 parts of recycled micropowder, 30-40 parts of composite cementitious material, 100-140 parts of construction solid waste recycled sand, 10-15 parts of modified biochar, 7-10 parts of retarder, 5-10 parts of admixture, and 40-50 parts of water.

[0006] Preferably, the composite gelling material comprises the following formula raw materials: 4-5 parts of aerogel, 6-10 parts of desulfurized ash, 10-13 parts of slag powder and 10-12 parts of industrial sludge.

[0007] Preferably, the additive is a micro-expanding agent, and the additive is any one of aluminum oxide, calcium oxide, and aluminum hydroxide.

[0008] Preferably, the gypsum includes one or more of natural gypsum, desulfurized gypsum, phosphogypsum and titanium gypsum.

[0009] Preferably, when preparing the modified biochar, it is necessary to perform a first calcination on agricultural waste in an airtight condition to obtain a biochar substrate, and then perform a second calcination on waste containing a Ca source, and after mixing with water, obtain a Ca(OH)2 suspension, and place the biochar substrate in the Ca(OH)2 suspension for immersion to obtain modified biochar, and the agricultural waste is one or more of wood, straw and stalks.

[0010] The preparation method of low-carbon anti-cracking micro-expansion gypsum plaster mortar comprises the following steps:

[0011] S1, Gypsum treatment: Select gypsum that complies with the standard of GB / T 9776-2008 as the raw material for making gypsum plastering mortar. Put the gypsum into a jaw crusher and crush it for 3 - 5 minutes to make gypsum powder;

[0012] S2, Preparation of construction waste recycled sand: Pour the waste bricks and stones into a cleaning pool, control the start of the cleaning equipment on the cleaning pool to remove the dirt and impurities therein, then sieve through a screening device to remove some impurities, and perform iron removal treatment through a magnetic separator. Pour the above raw materials into a jaw crusher and crush them for 3 - 5 minutes, and then pour the crushed raw materials into a grinding machine and grind them for 5 - 7 minutes to make construction waste recycled sand;

[0013] S3, Modified biochar treatment: Put the modified biochar into a jaw crusher and crush it for 4 - 6 minutes to make modified biochar powder;

[0014] S4, Preparation of composite cementitious material: In the first step, pour the corresponding amounts of aerogel, desulfurized ash, slag powder, and industrial oily sludge into a mixer in sequence, control the start of the stirrer in the mixer, and the mixing time is 4 - 6 minutes to make a mixture after mixing; In the second step, pour the corresponding amount of water into the mixer containing the mixture, control the start of the stirrer in the mixer, and the mixing time is 8 - 10 minutes to make a slurry, and form and cure the slurry to make a composite cementitious material;

[0015] S5, Material mixing: Pour the gypsum powder made in S1 into a reaction kettle, then put the construction waste recycled sand made in S2 into the reaction kettle, and then put the modified biochar powder made in S3 into the reaction kettle, and add the corresponding amounts of recycled fine powder and water. Control the start of the stirrer of the reaction kettle to preliminarily mix the above materials with water to make a first mixture, and then inject the corresponding amounts of composite cementitious material, retarder, and admixture into the reaction kettle, and control the start of the stirrer of the reaction kettle again to mix the above materials to make a low-carbon crack-resistant slightly expanding gypsum plastering mortar.

[0016] Preferably, the low-carbon crack-resistant slightly expanding gypsum plastering mortar made in S5 should be used up within 3 hours. If the environment is very dry or the temperature is very high, the time should be shortened.

[0017] Preferably, before using the equipment or device in S1, S2, S3, S4, and S5, it is necessary to cut off the power first, then check whether the grounding wire of the equipment is firm, and also check whether the insulation protection of the connected power supply is safe and reliable.

[0018] Beneficial effects

[0019] Compared with the prior art, the present invention provides a low-carbon crack-resistant slightly expanding gypsum plastering mortar and its preparation method, which have the following beneficial effects:

[0020] 1. The low-carbon crack-resistant slightly expanding gypsum plastering mortar, in terms of raw materials, the composite cementitious material obtained by compounding aerogel, desulfurized ash, slag powder and industrial oily sludge can replace 70% of cement, effectively reduce the carbon emissions in the construction industry, ensure the safety and stability of building structures, improve the service life of buildings, be more low-carbon and environmentally friendly, reduce environmental pollution, and slow down the pace of global warming. The modified biochar has porosity, a high specific surface area, good adsorption performance, a lasting improvement effect, etc. Its addition can effectively improve the performance of concrete, enhance its durability, crack resistance and reduce carbon emissions. The addition of the admixture can increase the durability and strength of the gypsum plastering mortar.

[0021] 2. The preparation method of the low-carbon crack-resistant slightly expanding gypsum plastering mortar involves cleaning and iron removal treatment of the recycled sand from construction waste to avoid affecting its quality. Specific Embodiments

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Example 1: The low-carbon crack-resistant slightly expanding gypsum plastering mortar includes the following parts by weight of formula raw materials: 60 parts of gypsum, 30 parts of cement, 10 parts of recycled fine powder, 30 parts of composite cementitious material, 100 parts of recycled sand from construction waste, 10 parts of modified biochar, 7 parts of retarder, 5 parts of admixture, and 40 parts of water. The composite cementitious material includes the following parts by weight of formula raw materials: 4 parts of aerogel, 6 parts of desulfurized ash, 10 parts of slag powder and 10 parts of industrial oily sludge. The admixture is a slightly expanding agent, and the admixture is alumina. The gypsum includes one or more of natural gypsum, desulfurized gypsum, phosphogypsum and titanium gypsum. When preparing the modified biochar, agricultural waste needs to be calcined for the first time under air isolation conditions to obtain a biochar substrate, and then the Ca-source waste is calcined for the second time. After mixing with water, a Ca(OH)2 suspension is obtained. The biochar substrate is placed in the Ca(OH)2 suspension and impregnated to obtain the modified biochar. The agricultural waste is one or several of wood, straw and straw.

[0024] The preparation method of the low-carbon crack-resistant slightly expanding gypsum plastering mortar includes the following steps:

[0025] S1. Gypsum treatment: Select gypsum that meets the GB / T 9776-2008 standard as the raw material for making the gypsum plastering mortar. Put the gypsum into a jaw crusher and crush it for 3 minutes to make gypsum powder;

[0026] S2. Preparation of recycled sand from construction waste: Pour the waste bricks and stones into the cleaning tank, start the cleaning equipment on the cleaning tank to remove the dirt and impurities therein, then screen through the screening equipment to remove some impurities, and conduct iron removal treatment through the iron remover. Pour the above raw materials into the jaw crusher and crush for 3 minutes, then pour the crushed raw materials into the grinder and grind for 5 minutes to make the recycled sand from construction waste;

[0027] S3. Treatment of modified biochar: Put the modified biochar into the jaw crusher and crush for 4 minutes to make the modified biochar powder;

[0028] S4. Preparation of composite cementitious material: In the first step, pour the corresponding amounts of aerogel, desulfurized ash, slag powder and industrial oily sludge into the mixer in sequence, start the stirrer in the mixer, and the mixing time is 4 minutes. After mixing, make a mixture. In the second step, pour the corresponding amount of water into the mixer containing the mixture, start the stirrer in the mixer, and the mixing time is 8 minutes to make a slurry. Shape and cure the slurry to make the composite cementitious material;

[0029] S5. Material mixing: Pour the gypsum powder made in S1 into the reaction kettle, then put the recycled sand from construction waste made in S2 into the reaction kettle, then put the modified biochar powder made in S3 into the reaction kettle, and add the corresponding amounts of recycled fine powder and water. Start the stirrer of the reaction kettle to preliminarily mix the above materials with water to make the first mixture. Then inject the corresponding amounts of composite cementitious material, retarder and admixture into the reaction kettle, and start the stirrer of the reaction kettle again to mix the above materials to make the low-carbon crack-resistant slightly expanded gypsum plastering mortar. The low-carbon crack-resistant slightly expanded gypsum plastering mortar made in S5 should be used up within 3 hours. If the environment is very dry or the temperature is very high, the time should be shortened. Before using the equipment or device in S1, S2, S3, S4 and S5, it is necessary to cut off the power first, then check whether the grounding wire of the equipment is firm, and also check whether the insulation protection of the connected power supply is safe and reliable.

[0030] Example 2: Low-carbon crack-resistant slightly expanding gypsum plastering mortar, which includes the following parts by weight of formula raw materials: 70 parts of gypsum, 35 parts of cement, 15 parts of recycled fine powder, 35 parts of composite cementitious material, 120 parts of construction waste recycled sand, 12 parts of modified biochar, 8 parts of retarder, 7 parts of admixture, 45 parts of water. The composite cementitious material includes the following parts by weight of formula raw materials: 4.5 parts of aerogel, 8 parts of desulfurized ash, 11 parts of slag powder, and 11 parts of industrial sludge. The admixture is a slightly expanding agent, and the admixture is calcium oxide. The gypsum includes one or several of natural gypsum, desulfurized gypsum, phosphogypsum, and titanium gypsum. When preparing the modified biochar, agricultural waste needs to be calcined for the first time under air isolation conditions to obtain a biochar substrate, and then the Ca source waste is calcined for the second time. After mixing with water, a Ca(OH)2 suspension is obtained. The biochar substrate is placed in the Ca(OH)2 suspension and impregnated to obtain the modified biochar. The agricultural waste is one or several of wood, straw, and straw.

[0031] Preparation method of low-carbon crack-resistant slightly expanding gypsum plastering mortar, which includes the following steps:

[0032] S1. Gypsum treatment: Select gypsum that meets the GB / T 9776-2008 standard as the raw material for making gypsum plastering mortar. Put the gypsum into a jaw crusher and crush it for 4 minutes to make gypsum powder;

[0033] S2. Preparation of construction waste recycled sand: Pour waste bricks and stones into a cleaning tank, control the start of the cleaning equipment on the cleaning tank to remove dirt and impurities, then screen through a screening device to remove some impurities, and perform iron removal treatment through a magnetic separator. Pour the above raw materials into a jaw crusher and crush for 4 minutes, and then pour the crushed raw materials into a grinding machine and grind for 5-7 minutes to make construction waste recycled sand;

[0034] S3. Modified biochar treatment: Put the modified biochar into a jaw crusher and crush it for 5 minutes to make modified biochar powder;

[0035] S4. Preparation of composite cementitious material: In the first step, pour the corresponding parts of aerogel, desulfurized ash, slag powder, and industrial sludge into a mixer in sequence, control the stirrer in the mixer to start, and the mixing time is 5 minutes. After mixing, a mixture is made; in the second step, pour the corresponding parts of water into the mixer containing the mixture, control the stirrer in the mixer to start, and the mixing time is 9 minutes to make a slurry. The slurry is formed and cured to make a composite cementitious material;

[0036] S5. Material mixing: Pour the gypsum powder made in S1 into the reaction kettle, then put the construction waste recycled sand made in S2 into the reaction kettle, and then put the modified biochar powder made in S3 into the reaction kettle. Add the corresponding amounts of recycled fine powder and water, start the stirrer of the reaction kettle, and preliminarily mix the above materials with water to make the first mixture. Then inject the corresponding amounts of composite cementitious material, retarder and admixture into the reaction kettle, start the stirrer of the reaction kettle again, and mix the above materials to make the low-carbon crack-resistant slightly expanded gypsum plastering mortar. The low-carbon crack-resistant slightly expanded gypsum plastering mortar made in S5 should be used up within 3 hours. If the environment is very dry or the temperature is very high, the time should be shortened. Before using the equipment or device in S1, S2, S3, S4 and S5, it is necessary to cut off the power first, then check whether the grounding wire of the equipment is firm, and also check whether the insulation protection of the connected power supply is safe and reliable.

[0037] Example 3: The low-carbon crack-resistant slightly expanded gypsum plastering mortar includes the following amounts of formula raw materials: 80 parts of gypsum, 40 parts of cement, 20 parts of recycled fine powder, 40 parts of composite cementitious material, 140 parts of construction waste recycled sand, 15 parts of modified biochar, 10 parts of retarder, 10 parts of admixture, and 50 parts of water. The composite cementitious material includes the following amounts of formula raw materials: 5 parts of aerogel, 10 parts of desulfurized ash, 13 parts of slag powder and 12 parts of industrial oily sludge. The admixture is a slightly expanded agent, and the admixture is aluminum hydroxide. The gypsum includes one or more of natural gypsum, desulfurized gypsum, phosphogypsum and titanium gypsum. When preparing the modified biochar, it is necessary to first calcine agricultural waste under air isolation conditions to obtain a biochar substrate, then secondarily calcine the Ca source-containing waste, and after mixing with water, obtain a Ca(OH)2 suspension. Place the biochar substrate in the Ca(OH)2 suspension and impregnate it to obtain the modified biochar. The agricultural waste is one or more of wood, straw and straw.

[0038] The preparation method of the low-carbon crack-resistant slightly expanded gypsum plastering mortar includes the following steps:

[0039] S1. Gypsum treatment: Select gypsum that meets the GB / T 9776-2008 standard as the raw material for making gypsum plastering mortar, put the gypsum into the jaw crusher, and crush it for 5 minutes to make gypsum powder;

[0040] S2. Preparation of construction waste recycled sand: Pour the waste bricks and stones into the cleaning tank, start the cleaning equipment on the cleaning tank to remove the dirt and impurities, then screen them through the screening equipment to remove some impurities, and perform iron removal treatment through the iron remover. Pour the above raw materials into the jaw crusher and crush them for 5 minutes, and then pour the crushed raw materials into the grinder and grind them for 7 minutes to make construction waste recycled sand;

[0041] S3. Modified biochar treatment: Put the modified biochar into a jaw crusher and crush it for 6 minutes to make modified biochar powder;

[0042] S4. Preparation of composite cementitious material: In the first step, pour the corresponding amounts of aerogel, desulfurized ash, slag powder and industrial oily sludge into a mixer in sequence, start the stirrer in the mixer, and the mixing time is 6 minutes. After mixing, a mixture is made; in the second step, pour the corresponding amount of water into the mixer containing the mixture, start the stirrer in the mixer, and the mixing time is 10 minutes to make a slurry. The slurry is formed and cured to make a composite cementitious material;

[0043] S5. Material mixing: Pour the gypsum powder made in S1 into a reaction kettle, then put the recycled construction waste sand made in S2 into the reaction kettle, and then put the modified biochar powder made in S3 into the reaction kettle. Add the corresponding amounts of recycled fine powder and water, start the stirrer of the reaction kettle, and preliminarily mix the above materials with water to make a first mixture. Then inject the corresponding amounts of composite cementitious material, retarder and admixture into the reaction kettle, and start the stirrer of the reaction kettle again to mix the above materials to make a low-carbon crack-resistant slightly expanded gypsum plastering mortar. The low-carbon crack-resistant slightly expanded gypsum plastering mortar made in S5 should be used up within 3 hours. If the environment is very dry or the temperature is very high, the time should be shortened. Before using the equipment or device in S1, S2, S3, S4 and S5, it is necessary to cut off the power first, then check whether the grounding wire of the equipment is firm, and also check whether the insulation protection of the connected power supply is safe and reliable.

[0044] It can be seen that: Plastering mortar is a general term for a type of mortar applied to the building base surface to level or provide protection. Plastering mortar mainly includes cement plastering mortar and gypsum plastering mortar. Gypsum plastering mortar has been widely used because of its advantages such as light weight, good heat preservation performance, small shrinkage rate, fire resistance, "breathing" function and simple construction. Some existing gypsum plastering mortars do not consider the problem of carbon emissions, resulting in continuous carbon emissions, polluting the environment and slowing down the pace of global warming. In terms of raw materials, the composite cementitious material obtained by compounding aerogel, desulfurized ash, slag powder and industrial oily sludge in the present invention can replace 70% of cement, effectively reduce carbon emissions in the construction industry, ensure the safety and stability of building structures, and improve the service life of buildings. It is more low-carbon and environmentally friendly, reduces environmental pollution and slows down the pace of global warming. Modified biochar has porosity, high specific surface area, good adsorption performance, lasting improvement effect, etc. Its addition can effectively improve the performance of concrete, improve its durability, crack resistance and reduce carbon emissions. The addition of admixtures can increase the durability and strength of gypsum plastering mortar. By cleaning and iron removal treatment of recycled construction waste sand, its quality is prevented from being affected.

Claims

1. Low-carbon crack-resistant slightly expanding gypsum plastering mortar, characterized in that The formula includes the following raw materials: 60-80 parts of gypsum, 30-40 parts of cement, 10-20 parts of recycled micropowder, 30-40 parts of composite cementitious materials, 100-140 parts of construction solid waste recycled sand, 10-15 parts of modified biochar, 7-10 parts of retarder, 5-10 parts of admixture, and 40-50 parts of water.

2. The low-carbon crack-resistant slightly expanding gypsum plastering mortar according to claim 1, wherein: The composite gelling material comprises the following formula raw materials: 4-5 parts of aerogel, 6-10 parts of desulfurized ash, 10-13 parts of slag powder and 10-12 parts of industrial sludge.

3. The low-carbon crack-resistant slightly expansive gypsum plastering mortar according to claim 1, wherein: The additive is a micro-expansion agent, and the additive is any one of aluminum oxide, calcium oxide, and aluminum hydroxide.

4. The low-carbon crack-resistant slightly expansive gypsum plastering mortar according to claim 1, wherein: The gypsum includes one or more of natural gypsum, desulfurized gypsum, phosphogypsum and titanium gypsum.

5. The low-carbon crack-resistant slightly expanding gypsum plastering mortar according to claim 1, wherein: When preparing the modified biochar, it is necessary to perform a first calcination on agricultural waste in an air-tight condition to obtain a biochar substrate, and then perform a second calcination on waste containing a Ca source, and after mixing with water, obtain a Ca(OH)2 suspension. The biochar substrate is placed in the Ca(OH)2 suspension and immersed to obtain modified biochar. The agricultural waste is one or more of wood, straw and stalks.

6. Preparation method of low-carbon crack-resistant slightly expanding gypsum plastering mortar, characterized in that: The following steps are involved: S1. Gypsum processing: Use gypsum that meets the GB / T 9776-2008 standard as the raw material for making gypsum plaster mortar, put the gypsum into a jaw crusher, crush it for 3-5 minutes, and make gypsum powder; S2. Preparation of regenerated sand from construction solid waste: Pour the discarded bricks and stones into a cleaning tank, start the cleaning equipment on the cleaning tank, remove the dirt and impurities therein, and then screen them through a screening device to remove some impurities, and remove iron through an iron remover, pour the above raw materials into a jaw crusher, crush them for 3-5 minutes, and then pour the crushed raw materials into a grinder, grind them for 5-7 minutes, and make regenerated sand from construction solid waste; S3. Modified biochar treatment: put the modified biochar into a jaw crusher and crush it for 4-6 minutes to make modified biochar powder; S4, preparation of composite gelling material: first, pouring corresponding portions of aerogel, desulfurization ash, slag powder and industrial oil sludge into a mixer in sequence, controlling the agitator in the mixer to start, mixing for 4-6 minutes, and mixing to form a mixture; second, pouring corresponding portions of water into the mixer containing the mixture, controlling the agitator in the mixer to start, mixing for 8-10 minutes, forming a slurry, and molding and curing the slurry to form a composite gelling material; S5. Material mixing: pour the gypsum powder prepared in S1 into the reactor, then put the construction solid waste regenerated sand prepared in S2 into the reactor, then put the modified biochar powder prepared in S3 into the reactor, and add corresponding portions of regenerated micro powder and water, control the agitator of the reactor to start, preliminarily mix the above materials with water to prepare a first mixture, then inject corresponding portions of composite cementitious material, retarder and admixture into the reactor, control the agitator of the reactor to start again, mix the above materials to prepare low-carbon anti-cracking micro-expansion gypsum plaster mortar.

7. The preparation method of the low-carbon crack-resistant slightly expanding gypsum plastering mortar according to claim 6, characterized in that: The low-carbon crack-resistant slightly expanding gypsum plastering mortar prepared in S5 shall be used up within 3 hours. If the environment is very dry or the temperature is very high, the time shall be shortened.

8. The preparation method of the low-carbon crack-resistant slightly expanding gypsum plastering mortar according to claim 7, characterized in that: Before using the equipment or device in S1, S2, S3, S4 and S5, the power supply shall be cut off first, then check whether the grounding wire of the equipment is firm, and also check whether the insulation protection of the connected power supply is safe and reliable.