Adhesive foam concrete thermal insulation material as well as preparation method and use method thereof

Abstract

The invention relates to the technical field of concrete admixtures, in particular to an adhesive foam concrete thermal insulation material as well as a preparation method and a use method thereof. The adhesive foam concrete thermal insulation material comprises the following raw material components: solid powder and water, the solid powder is prepared from the following components in parts by weight: 300 to 350 parts of sulphoaluminate cement, 50 to 100 parts of quick lime, 3 to 6 parts of aluminum powder and 5 to 7 parts of alkali-free accelerator powder; the alkali-free accelerator comprises the following components in percentage by mass: more than 60% of aluminum sulfate. The adhesive foam concrete thermal insulation material is short in setting time and can be directly foamed and coagulated on an outer wall, and the formed foam concrete is good in bonding effect with the outer wall and high in compressive strength, so that the anti-collision capacity of the foam concrete can be effectively improved, and the problem that existing foam concrete is difficult to apply to thermal insulation of the outer wall is solved. The adhesive foam concrete thermal insulation material utilizes chemical foaming, does not need to use foaming equipment, is simple and convenient to construct, and can effectively reduce the construction cost.

Description

Technical Field

[0001] The present application relates to the technical field of concrete admixtures, and in particular to an adhesive foam concrete thermal insulation material and a preparation method and a use method thereof. Background Art

[0002] Foamed concrete, also known as foamed cement, is a building material that uses a foaming system to mechanically foam a foaming liquid made of a foaming agent and inject it into cement slurry, then stir and mix it evenly and cast it into shape. Foamed concrete contains a large number of closed pores and has good compatibility with other building materials. It has good performance as a thermal insulation material.

[0003] However, foam concrete panels are generally not preferred in the field of exterior wall insulation because: the existing foam concrete, which is formed by mixing cement slurry and then hydrating and condensing, is difficult to bond well with the exterior wall, and the formed foam concrete has insufficient compressive strength and is easily damaged under outdoor conditions. In addition, during the construction of foam concrete, the foaming liquid needs to be foamed mechanically (usually using foaming equipment, etc.) and injected into the cement slurry, resulting in a complicated and troublesome construction process and high cost.

[0004] Unlike other thermal insulation materials that use extrusion and thermoforming processes, existing foam concrete is generally formed by mixing cement slurry and then hydrating and condensing it. Since cement slurry itself has a high dead weight, a large number of bubbles must be added to reduce the density of foam concrete as an insulation material. Generally, the proportion of pores in the volume of foam concrete at a density of 600kg / m³ can reach nearly 70%, which has a great impact on its strength. In addition, since the crust of foamed cement board is brittle after molding, the outer surface is often removed during the cutting step in industrial production, resulting in more holes on the surface of the finished board, making it difficult to bond well to the exterior wall with adhesives.

[0005] In summary, the existing foamed concrete formed by mixing cement slurry and then hydrating and solidifying has the defects of low strength, poor bonding effect with the wall, and complex construction process, which makes it difficult to apply the existing foamed concrete to exterior wall insulation. Summary of the invention

[0006] In order to solve the problems of the prior art mentioned in the above background technology: the existing solidified foam concrete has low strength, poor bonding effect with the wall, and complex construction process, which makes it difficult to apply foam concrete to exterior wall insulation. This application provides an adhesive foam concrete insulation material, and its technical solution is as follows: The raw material components of the adhesive foam concrete thermal insulation material include solid powder and water by weight; the solid powder includes 300-350 parts of cement, 50-100 parts of quicklime, 3-6 parts of aluminum powder, and 5-7 parts of alkali-free accelerator powder by weight; wherein the cement is sulphoaluminate cement; the component of the alkali-free accelerator includes aluminum sulfate, wherein the mass content of aluminum sulfate is above 60%.

[0007] In some embodiments, the weight ratio of the solid powder to the water is 4:1.

[0008] In some embodiments, the thermal insulation material is composed of solid powder and water; in parts by weight, the solid powder is composed of 300-350 parts of cement, 50-100 parts of quicklime, 3-6 parts of aluminum powder, and 5-7 parts of alkali-free quick-setting agent powder.

[0009] In some embodiments, the sulphoaluminate cement is one or more combinations of rapid hardening sulphoaluminate cement R·SAC and low alkalinity sulphoaluminate cement L·SAC.

[0010] In some embodiments, the quicklime is quicklime powder.

[0011] In some embodiments, the quicklime is quicklime for silicate building products.

[0012] In some embodiments, the aluminum powder is 200-400 mesh aluminum powder.

[0013] The present application also provides a method for preparing the above-mentioned adhesive foam concrete thermal insulation material, which comprises the following steps: According to the formula, cement, quicklime, aluminum powder and alkali-free accelerating agent powder are weighed and mixed evenly to obtain mixed powder A; The mixed powder A is mixed evenly with water to obtain the adherent foam concrete thermal insulation material.

[0014] In some embodiments, the preparation method includes the following steps: weighing cement, quicklime, aluminum powder and alkali-free quick-setting agent powder according to the formula, putting them into a powder mixer and mixing them evenly to obtain mixed powder A; adding water to the mixed powder A and mixing them evenly to obtain the adherent foam concrete thermal insulation material.

[0015] The present application also provides a method for using the above-mentioned adhesive foam concrete thermal insulation material, which comprises the following steps: Injecting adherent foam concrete insulation into the mold; Fix the mold on the outer wall and leave it there for a certain period of time to allow the insulation material to foam and solidify into shape; After the mold is filled with the insulation material, the mold is removed after waiting for a certain period of time to obtain foam concrete.

[0016] In some embodiments, the method of use comprises the following steps: The adhesive foam concrete insulation material fills 33% to 40% of the volume of the mold; Fix the mold on the outer wall and let it stand for 3-5 minutes to allow the insulation material to foam and solidify; After the mold is filled with the insulation material, wait for 30 to 90 seconds before demolding.

[0017] Compared with the existing technology, this application has the following effects: The adhesive foam concrete thermal insulation material provided by the present application has a short setting time, can be directly foamed and set on the exterior wall, and the formed foam concrete has a good bonding effect with the exterior wall and high compressive strength, thereby effectively improving the anti-collision ability of the foam concrete, solving the problem that the existing foam concrete is difficult to apply to exterior wall thermal insulation. The adhesive foam concrete thermal insulation material uses chemical foaming, does not require the use of foaming equipment, is simple to construct and can effectively reduce construction costs. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] The present application also provides the following embodiments and comparative examples: The present application also provides the formulas of the embodiments and comparative examples as shown in Table 1 (unit: g): Table 1 Components Example 1 Example 2 Comparative Example 1 Comparative Example 2 Sulphoaluminate cement 3500 3000 3500 - quicklime 1000 500 1000 1000 Aluminum powder 30 40 30 30 Alkali-free accelerating setting agent powder (aluminum sulfate 80%) 50 70 - 50 Ordinary Portland Cement - - - 3500 water 1145 900 1030 1145 Components Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Sulphoaluminate cement 3500 5500 3500 3500 quicklime - 1000 1000 1000 Aluminum powder 30 30 30 30 Alkali-free accelerating setting agent powder (aluminum sulfate 80%) 50 50 140 - Alkali-free accelerating setting agent powder (aluminum sulfate 30%) - - - 50 water 895 1650 1165 1145 In Table 1, the amount of water is adjusted according to the amount of powder, which is about one-fourth of the mass of the solid powder.

[0020] Specifically, the selection of each raw material component is: The sulphoaluminate cement used is L·SAC. The quicklime used is quicklime powder for silicate building products. The aluminum powder used is 200 mesh aluminum powder. The alkali-free quick-setting agent powder (aluminum sulfate 80%) used has an aluminum sulfate mass content of 80%. The specific parameters of the alkali-free quick-setting agent powder are that the initial setting time of the alkali-free quick-setting agent pure slurry setting time is 2 minutes and the final setting time is 5 minutes. The alkali-free quick-setting agent powder (aluminum sulfate 30%) used has an aluminum sulfate mass content of 30%. The specific parameters of the alkali-free quick-setting agent powder are that the initial setting time of the alkali-free quick-setting agent pure slurry setting time is 5 minutes and the final setting time is 10 minutes.

[0021] Specifically, the preparation process of the provided embodiments and comparative examples is as follows: The powders of the raw material components in Table 1 are put into a powder mixer and mixed evenly to obtain mixed powder A; water is added to the mixed powder A and mixed evenly quickly to obtain the adherent foam concrete thermal insulation material.

[0022] The foamed concrete thermal insulation materials that can be adhered and the foamed concrete obtained by curing the thermal insulation materials prepared in the above embodiments and comparative examples were tested for relevant indicators. The test results are shown in Table 2 below: Table 2

[0023] In Table 2, the test standard or method for the 7d (7 days) compressive strength index is "Foamed Concrete" JG / T 226-2011; the test standard or method for dry density is "Foamed Concrete" JG / T 226-2011; the test standard or method for initial setting time is "Standard for Test Methods of Ordinary Concrete Mixture Performance" GB / T 50080-2016; the test standard or method for the bonding effect with the exterior wall is "Technical Code for External Wall Insulation Engineering" JGJ144-2005. Among them, the method for solidifying the adhering foam concrete insulation material to form a foam concrete sample for testing refers to the above-mentioned standard "Foamed Concrete" JG / T 226-2011.

[0024] From the test results in the table above: The adhesive foam concrete provided in the embodiment of the present application has a faster setting time, better volume stability, higher compressive strength, and the formed foam concrete has a good bonding effect with the exterior wall, and can meet the functional requirements of direct mixing and molding on site.

[0025] Compared with Example 1, no alkali-free accelerating setting agent was added in Comparative Example 1, and the cement paste failed to solidify before the bubbles completed foaming, and the small pores in the slurry combined to form large pores, resulting in a decrease in compressive strength.

[0026] Compared with Example 1, Comparative Example 2 uses ordinary Portland cement, the temperature during the hydration reaction is insufficient, the aluminum powder matched with it fails to emit sufficient bubbles, and due to the slow hydration reaction, the 7d compressive strength is lower than that of the example.

[0027] Compared with Example 1, in Comparative Example 3, quicklime was not added, the hydration reaction temperature and coagulation speed were insufficient, bubbles were not quickly coagulated after being formed, some bubbles dissipated, and the 7d compressive strength was lower than that of the example.

[0028] Compared with Example 1, the amount of sulphoaluminate cement added in Comparative Example 4 exceeds the specified range of the present application, which increases the bulk density of the unfoamed slurry and relatively dilutes the foamed components, resulting in the finished product failing to meet the corresponding density requirements.

[0029] Compared with Example 1, the amount of alkali-free accelerating setting agent added in Comparative Example 5 exceeds the specified range of the present application, resulting in too fast setting time, and setting occurs before foaming is completed, resulting in too high density. Moreover, after losing fluidity, the aluminum powder has a large amount of gas emission, resulting in irreparable defects inside the finished product, affecting the strength.

[0030] Compared with Example 1, the aluminum sulfate content of the alkali-free accelerating setting agent used in Comparative Example 6 is lower than the specified range of the present application, and thus fails to play a good accelerating setting effect. After the bubbles complete gasification, the slurry does not quickly lose fluidity, resulting in the dissipation of some bubbles. Moreover, since the gas movement path in the bubbles is from small bubbles to large bubbles, the average particle size of the bubbles is larger than that in Example 1, which affects the compressive strength and density of the concrete.

[0031] In summary, compared with the prior art, the present application scheme includes the following design concepts and beneficial effects: The adhesive foam concrete insulation material provided in the present application adopts specific sulphoaluminate cement, quicklime, aluminum powder, and alkali-free accelerating agent powder in a specific proportion to form a variety of rapid setting systems, and coordinates the exothermic temperature and hydration rate through a specific multi-component compound formula: The main functional component of alkali-free accelerator is aluminum sulfate. By adding a specific proportion of alkali-free accelerator and quicklime, Al is introduced into the foamed concrete. 3+ To promote the equilibrium of the ettringite reaction and to react with the Ca introduced by the quicklime 2+ It can react directly and greatly accelerate the setting time. Due to the advance of the setting time, a specific proportion of sulphoaluminate cement and aluminum powder are added, which accelerates the reaction and releases a large amount of heat through sulphoaluminate cement and aluminum powder, and finally achieves the effect of completing foaming and achieving final setting in a short time.

[0032] Among them, the alkali-free accelerator is added with quicklime, sulphoaluminate cement and aluminum powder in a specific proportion, and the desired effect of the present application can be achieved through synergistic effect. If the alkali-free accelerator is not added or the aluminum sulfate content in the alkali-free accelerator is lower than the specified range of the present application, so that no Al is introduced 3+ Or the introduced Al 3+ Too little will lead to the destruction of balance, the cement paste fails to solidify before the bubbles complete foaming, the small pores in the paste combine to form large pores, resulting in reduced compressive strength and density of foamed concrete. 2+ With Al 3+A reaction occurs, resulting in insufficient hydration reaction temperature and coagulation speed. After the bubbles are formed, they fail to coagulate quickly, and the compressive strength of the concrete is reduced.

[0033] Moreover, the alkali-free quick-setting agent and quicklime and other components in the present application must be combined in a specific proportion to achieve the desired effect. If the proportion of the alkali-free quick-setting agent exceeds the specified range of the present application, the foamed concrete insulation material will set too quickly and set before the foaming is completed, resulting in excessively high concrete density. After losing fluidity, the large amount of gas evolution of the aluminum powder inside will cause irreparable defects inside the finished product, resulting in a decrease in compressive strength.

[0034] In this application, the desired effect can be achieved by using specific types of sulphoaluminate cement and aluminum powder and other components in a specific proportion. Since the hydration heat release and heat release rate of sulphoaluminate cement are higher than those of silicate cement, it can effectively accelerate the foaming rate of aluminum powder in an alkaline environment, bringing sufficient internal gas pressure to fully support the volume of the slurry before solidification. In addition, the CaAl2(SO4)4 in the sulphoaluminate cement can provide SO4 2- , Ca 2+ 、Al(OH) 4- OH - Plasma, in the same direction as the reaction of alkali-free accelerator and lime, accelerates the rapid formation of calcium sulfonate. If ordinary silicate cement is used instead of sulphoaluminate cement, the temperature during the hydration reaction is insufficient, and the aluminum powder fails to emit enough bubbles, resulting in excessive concrete density. In addition, due to the slow hydration reaction and the prolonged setting time, the early compressive strength of the foamed concrete decreases. In addition, sulphoaluminate cement and aluminum powder and other components need to be matched in a specific ratio. If the sulphoaluminate cement ratio exceeds the specified range of this application, the bulk density of the unfoamed slurry will increase, and the foaming component will also be relatively diluted, resulting in the finished product failing to meet the corresponding density requirements.

[0035] In summary, the present application prepares a premix (i.e., an adhesive foam concrete insulation material) by making a condensing component and a foaming component. After on-site mixing, the mold can be directly fixed on the exterior wall to form foam concrete. This not only ensures the bonding effect between the foam concrete surface and the wall, but also improves the compressive strength, thereby improving the anti-collision ability of the foam concrete, and solves the problem that the existing foam concrete is difficult to use in exterior wall insulation.

[0036] The present application provides an adhesive foam concrete thermal insulation material, which has a short setting time and can be directly formed on the exterior wall to form foam concrete, has good integrity, good bonding effect with the exterior wall, high hydration degree and high compressive strength. In addition, the adhesive foam concrete thermal insulation material adopts chemical foaming without the need for foaming equipment, is easy to construct and can effectively reduce construction costs.

[0037] It should be noted that: In this article, “~” is used to indicate a numerical range, and the range indicated by this expression includes two endpoint values.

[0038] The specific parameters or some commonly used reagents or raw materials in the above embodiments are specific embodiments or preferred embodiments of the present application, but are not intended to limit the present application. Those skilled in the art may make adaptive adjustments within the scope of the present application.

[0039] In addition, unless otherwise specified, the raw materials used may also be conventional commercial products in the art, or prepared by conventional methods in the art; that is, the reagents and instruments used in this embodiment are not indicated with information such as the manufacturer, and are all conventional products that can be purchased on the market.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A foam concrete thermal insulation material, characterized in that: The raw material components include solid powder and water by weight; In parts by weight, the solid powder comprises 300-350 parts of cement, 50-100 parts of quicklime, 3-6 parts of aluminum powder, and 5-7 parts of alkali-free quick-setting agent powder; Wherein, the cement is sulphoaluminate cement; the components of the alkali-free accelerating setting agent include aluminum sulfate, wherein the mass content of aluminum sulfate is above 60%.

2. The adhesive foam concrete thermal insulation material according to claim 1 is characterized in that: The weight ratio of the solid powder to the water is 4:

1.

3. The adhesive foam concrete thermal insulation material according to claim 1 or 2, characterized in that: It consists of solid powder and water; In parts by weight, the solid powder consists of 300-350 parts of cement, 50-100 parts of quicklime, 3-6 parts of aluminum powder, and 5-7 parts of alkali-free quick-setting agent powder.

4. The adhesive foam concrete thermal insulation material according to claim 1 is characterized in that: The sulphoaluminate cement is one or more combinations of rapid hardening sulphoaluminate cement R·SAC and low alkalinity sulphoaluminate L·SAC; The quicklime is quicklime powder.

5. The adhesive foam concrete thermal insulation material according to claim 1, characterized in that: The quicklime is quicklime for silicate building products.

6. The adhesive foam concrete thermal insulation material according to claim 1, characterized in that: The aluminum powder is 200-400 mesh aluminum powder.

7. A method for preparing the adhesive foam concrete thermal insulation material according to any one of claims 1 to 6, characterized in that: The following steps are involved: According to the formula, cement, quicklime, aluminum powder and alkali-free accelerating agent powder are weighed and mixed evenly to obtain mixed powder A; The mixed powder A is mixed evenly with water to obtain the adherent foam concrete thermal insulation material.

8. The method for preparing the adherable foam concrete thermal insulation material according to claim 7, characterized in that: The following steps are involved: According to the formula, cement, quicklime, aluminum powder and alkali-free accelerating setting agent powder are weighed and put into a powder mixer to be fully mixed to obtain mixed powder A; Water is added to the mixed powder A and mixed evenly to obtain the adherent foam concrete thermal insulation material.

9. A method for using the adhesive foam concrete thermal insulation material according to any one of claims 1 to 6, characterized in that: The following steps are involved: Injecting adherent foam concrete insulation into the mold; Fix the mold on the outer wall and leave it there for a certain period of time to allow the insulation material to foam and solidify into shape; After the mold is filled with the insulation material, wait for a certain period of time before removing the mold.

10. The method for using the adhesive foam concrete thermal insulation material according to claim 9, characterized in that: The following steps are involved: The adhesive foam concrete insulation material fills 33% to 40% of the volume of the mold; Fix the mold on the outer wall and let it stand for 3-5 minutes to allow the insulation material to foam and solidify; After the mold is filled with the insulation material, wait for 30 to 90 seconds before removing the mold to obtain foam concrete.

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