Preparation method of fiber rubber foam concrete with foam in layered and directional arrangement
By arranging the fiber rubber mesh layer and foam concrete slurry in layers and directionally, forming a fiber rubber foam concrete product with a sandwich structure, the problems of low compressive strength and large thermal conductivity in the prior art are solved, and higher compressive strength and lower thermal conductivity are achieved.
Patent Information
- Application Number
- CN202510440543.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-09
- Publication Date
- 2025-06-06
AI Technical Summary
The existing fiber rubber foam concrete preparation methods lead to low compressive strength and large thermal conductivity of the products, which affects the performance of the structure.
By arranging the fiber rubber mesh layer and foam concrete slurry in layers and directions, a fiber rubber foam concrete product with a sandwich structure is formed to improve compressive strength and reduce thermal conductivity.
The compressive strength of fiber rubber foam concrete products is significantly improved, and its thermal conductivity is reduced, improving the performance of the structure.
Smart Images
Figure CN120095940A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of concrete preparation, and in particular to a method for preparing fiber-rubber foam concrete with layered and directionally arranged foam. Background Art
[0002] Foam concrete has many engineering advantages such as light weight, high strength and good density adjustability. It has gradually been widely used in the field of transportation civil engineering infrastructure. However, under the coupling effect of multiple factors under long-term service, some performance deficiencies of foam concrete are gradually becoming prominent, thus affecting the performance of the structure.
[0003] In recent years, researchers have continuously applied different materials to the study of foam concrete in order to improve the performance of foam concrete. Adding fibers and rubber particles to foam concrete is currently a more advanced improvement method. The addition of rubber particles can effectively enhance the thermal properties of foam concrete, and the addition of polymer fibers can increase the strength of foam concrete. The current method for preparing fiber-rubber foam concrete is to mix and stir fibers, rubber and raw materials for preparing foam concrete. The products prepared by this traditional preparation method have low compressive strength and large thermal conductivity. Therefore, it is of great significance to seek a new method for preparing fiber-rubber foam concrete. Summary of the invention
[0004] The purpose of the present invention is to provide a method for preparing fiber-rubber foam concrete with layered and directional foam arrangement, which improves the compressive strength of the obtained product and reduces the thermal conductivity of the obtained product through layered and directional arrangement.
[0005] To achieve the above object, the technical solution adopted by the present invention is: a method for preparing fiber-rubber foam concrete with layered and directional foam, comprising the following steps:
[0006] S1, forming a fiber mesh by gluing polypropylene fibers, and then coating the surface of rubber particles with epoxy resin and evenly sprinkling them on the fiber mesh to form a fiber rubber mesh layer;
[0007] S2, adding cement, fly ash and water into a mixer and stirring them thoroughly to obtain cement slurry; mixing a foaming agent with water and stirring them to obtain a foaming solution after fully foaming; adding the foaming solution into the cement slurry and stirring them thoroughly with a concrete mixer to obtain a foamed concrete slurry;
[0008] S3. When pouring the foamed concrete slurry in the standard mold, first place a layer of the fiber rubber mesh layer prepared in step S1 at the bottom of the mold, then pour the foamed concrete slurry prepared in step S2, then place another layer of the fiber rubber mesh layer prepared in step S1, and then pour the foamed concrete slurry prepared in step S2. The fiber rubber mesh layers prepared in step S1 are laid in layers in batches according to the actual use of the obtained product to form a fiber rubber foamed concrete product with a sandwich structure.
[0009] Preferably, in step S1, 800 grams of rubber particles are evenly sprinkled on each square meter of the polypropylene fiber web.
[0010] Preferably, in step S1, the length of the polypropylene fiber is 6-18 mm, and the particle size of the rubber particles is 0.3-0.4 mm.
[0011] Preferably, in step S2, the cement slurry is prepared by 540-560 parts of cement, 140-160 parts of fly ash, and 240-260 parts of water.
[0012] Preferably, in step S2, the mass ratio between the foaming agent and water is 1:40; the mass ratio between the foaming solution and the cement slurry is 1:18.6.
[0013] Furthermore, in step S3, a fiber rubber mesh is laid every 20 mm; and the obtained fiber rubber foam concrete product is cured for 28 days under standard curing conditions.
[0014] Compared with the prior art, the present invention has the following beneficial effects:
[0015] The invention determines the number of times of laying the fiber rubber mesh layer in layers and the thickness of pouring the foam concrete slurry according to the actual use of the obtained product; the method improves the compressive strength of the obtained product and reduces the thermal conductivity of the obtained product through layered directional arrangement. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the structure of the product obtained by the present invention;
[0017] In the figure, 1. foam concrete slurry, 2. rubber particles, 3. fiber. DETAILED DESCRIPTION
[0018] The present invention is further described in detail below in conjunction with embodiments.
[0019] Embodiment 1
[0020] A method for preparing fiber-rubber foam concrete with layered and directional foam, comprising the following steps:
[0021] S1. 0.5 parts of 12 mm polypropylene fibers are glued to form a fiber web, and then 20 parts of 0.4 mm rubber particles are coated with epoxy resin on the surface and evenly sprinkled on the fiber web to form a fiber rubber web layer; that is, 800 grams of rubber particles are evenly sprinkled on each square meter of the polypropylene fiber web;
[0022] S2. Add 560 parts of cement, 140 parts of fly ash and 250 parts of water into a mechanical mixer and stir them thoroughly to obtain cement slurry; mix 1 part of foaming agent with 40 parts of water, and after they are completely dissolved, stir the foam liquid with a mechanical mixer to fully foam it into foam to obtain a foaming solution; add the foaming solution to the cement slurry, and the mass ratio between the foaming solution and the cement slurry is 1:18.6; stir them thoroughly with a concrete mixer to obtain a foamed concrete slurry;
[0023] S3. When pouring the foam concrete slurry in the standard mold, a fiber rubber mesh is laid every 20 mm. First, a layer of the fiber rubber mesh prepared in step S1 is placed at the bottom of the mold, and then the foam concrete slurry prepared in step S2 is poured. Then, another layer of the fiber rubber mesh prepared in step S1 is placed, and then the foam concrete slurry prepared in step S2 is poured. The product prepared in this embodiment will be used for thermal insulation wall panels (the use direction is perpendicular to the ground). Three layers of the fiber rubber mesh prepared in step S1 are laid (that is, the fiber rubber mesh prepared in step S1 is evenly divided into 3 parts for laying), and three layers of concrete slurry are poured (that is, the foam concrete slurry prepared in step S2 is evenly divided into 3 parts for pouring), forming a fiber rubber foam concrete product with a sandwich structure, such as Figure 1 as shown and cured for 28 days under standard curing conditions.
[0024] Comparative Example 1
[0025] A conventional method for preparing fiber rubber foam concrete: 560 parts of cement, 140 parts of fly ash, 20 parts of 0.4 mm rubber particles, 0.5 parts of 12 mm polypropylene fiber and 250 parts of water are sequentially added into a mechanical mixer and fully stirred to ensure uniform mixing; 1 part of a foaming agent is mixed with 40 parts of water, and after complete dissolution, a foam liquid is stirred with a mechanical mixer to fully foam it into foam, and then the foam is added into cement slurry, and stirred evenly with a mechanical mixer to obtain a foam concrete slurry; the foam concrete is poured into a standard mold and cured for 28 days under standard curing conditions.
[0026] Embodiment 2
[0027] A method for preparing fiber-rubber foam concrete with layered and directional foam, comprising the following steps:
[0028] S1. 0.5 parts of 12 mm polypropylene fibers are glued to form a fiber web, and then 20 parts of 0.4 mm rubber particles are coated with epoxy resin on the surface and evenly sprinkled on the fiber web to form a fiber rubber web layer; that is, 800 grams of rubber particles are evenly sprinkled on each square meter of the polypropylene fiber web;
[0029] S2, adding 540 parts of cement, 160 parts of fly ash, and 250 parts of water into a mechanical mixer and stirring them thoroughly to obtain cement slurry; mixing 1 part of foaming agent with 40 parts of water, and after completely dissolving, stirring the foam liquid with a mechanical mixer to fully foam it into foam to obtain a foaming solution; adding the foaming solution to the cement slurry, the mass ratio between the foaming solution and the cement slurry is 1:18.6; stirring it thoroughly with a concrete mixer to obtain a foamed concrete slurry;
[0030] S3. When pouring the foam concrete slurry in the standard mold, a fiber rubber mesh is laid every 20 mm. First, a layer of the fiber rubber mesh prepared in step S1 is placed at the bottom of the mold, and then the foam concrete slurry prepared in step S2 is poured. Then, another layer of the fiber rubber mesh prepared in step S1 is placed, and then the foam concrete slurry prepared in step S2 is poured. The product prepared in this embodiment will be used for roof insulation boards (the use direction is parallel to the ground). Seven layers of the fiber rubber mesh prepared in step S1 are laid (that is, the fiber rubber mesh prepared in step S1 is divided into 7 parts for laying), and seven layers of concrete slurry are poured (that is, the foam concrete slurry prepared in step S2 is divided into 7 parts for pouring), forming a sandwich-type fiber rubber foam concrete product, such as Figure 1 as shown and cured for 28 days under standard curing conditions.
[0031] Comparative Example 2
[0032] A conventional method for preparing fiber rubber foam concrete: 540 parts of cement, 160 parts of fly ash, 20 parts of 0.4 mm rubber particles, 0.5 parts of 12 mm polypropylene fiber and 250 parts of water are sequentially added into a mechanical mixer and fully stirred to ensure uniform mixing; 1 part of a foaming agent is mixed with 40 parts of water, and after complete dissolution, a foam liquid is stirred with a mechanical mixer to fully foam it into foam, and then the foam is added into cement slurry, and stirred evenly with a mechanical mixer to obtain a foam concrete slurry; the foam concrete is poured into a standard mold and cured for 28 days under standard curing conditions.
[0033] Embodiment 3
[0034] A method for preparing fiber-rubber foam concrete with layered and directional foam, comprising the following steps:
[0035] S1. 0.5 parts of 12 mm polypropylene fibers are glued to form a fiber web, and then 20 parts of 0.4 mm rubber particles are coated with epoxy resin on the surface and evenly sprinkled on the fiber web to form a fiber rubber web layer; that is, 800 grams of rubber particles are evenly sprinkled on each square meter of the polypropylene fiber web;
[0036] S2. Add 550 parts of cement, 150 parts of fly ash and 250 parts of water into a mechanical mixer and stir them thoroughly to obtain cement slurry; mix 1 part of foaming agent with 40 parts of water, and after they are completely dissolved, stir the foam liquid with a mechanical mixer to fully foam it into foam to obtain a foaming solution; add the foaming solution to the cement slurry, and the mass ratio between the foaming solution and the cement slurry is 1:18.6; stir them thoroughly with a concrete mixer to obtain a foamed concrete slurry;
[0037] S3. When pouring the foam concrete slurry in the standard mold, a fiber rubber mesh is laid every 20 mm. First, a layer of the fiber rubber mesh prepared in step S1 is placed at the bottom of the mold, and then the foam concrete slurry prepared in step S2 is poured. Then, another layer of the fiber rubber mesh prepared in step S1 is placed, and then the foam concrete slurry prepared in step S2 is poured. The product prepared in this embodiment will be used for sound insulation wall panels (the use direction is perpendicular to the ground). Two layers of the fiber rubber mesh prepared in step S1 are laid (that is, the fiber rubber mesh prepared in step S1 is evenly divided into 2 parts for laying), and two layers of concrete slurry are poured (that is, the foam concrete slurry prepared in step S2 is evenly divided into 2 parts for pouring), forming a fiber rubber foam concrete product with a sandwich structure, such as Figure 1 as shown and cured for 28 days under standard curing conditions.
[0038] Comparative Example 3
[0039] A conventional method for preparing fiber rubber foam concrete: 550 parts of cement, 150 parts of fly ash, 20 parts of 0.4 mm rubber particles, 0.5 parts of 12 mm polypropylene fiber and 250 parts of water are sequentially added into a mechanical mixer and fully stirred to ensure uniform mixing; 1 part of a foaming agent is mixed with 40 parts of water, and after complete dissolution, a foam liquid is stirred with a mechanical mixer to fully foam it into foam, and then the foam is added into cement slurry, and stirred evenly with a mechanical mixer to obtain a foam concrete slurry; the foam concrete is poured into a standard mold and cured for 28 days under standard curing conditions.
[0040] The compressive strength of foamed concrete was tested according to the standard "Foamed Concrete" (JG / T266-2011), and the thermal conductivity of foamed concrete was measured using a DRE-2C thermal conductivity tester according to the requirements of "Test Method for Thermal Conductivity and Thermal Diffusivity of Building Materials by Transient Plane Heat Source" (GB / T32064-2015). Note: The compressive strength test direction of the embodiment is to apply pressure downward when the fiber rubber net is vertical, and the thermal conductivity test direction of the embodiment is to make the fiber rubber net parallel to the heating plate. The results are shown in Table 1 below:
[0041] Table 1 Performance test data
[0042]
[0043] It can be seen from Table 1 that the product prepared by the preparation method proposed in the present invention has higher compressive strength and smaller thermal conductivity than the product prepared by the traditional fiber rubber foam concrete preparation method.
[0044] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention should be covered by the protection scope of the present invention.
Claims
1. A method for preparing fiber-rubber foam concrete with layered and directional foam, characterized in that: The following steps are involved: S1, forming a fiber mesh by gluing polypropylene fibers, and then coating the surface of rubber particles with epoxy resin and evenly sprinkling them on the fiber mesh to form a fiber rubber mesh layer; S2, adding cement, fly ash and water into a mixer and stirring them thoroughly to obtain cement slurry; mixing a foaming agent with water and stirring them to obtain a foaming solution after fully foaming; adding the foaming solution into the cement slurry and stirring them thoroughly with a concrete mixer to obtain a foamed concrete slurry; S3. When pouring the foamed concrete slurry in the standard mold, first place a layer of the fiber rubber mesh layer prepared in step S1 at the bottom of the mold, then pour the foamed concrete slurry prepared in step S2, then place another layer of the fiber rubber mesh layer prepared in step S1, and then pour the foamed concrete slurry prepared in step S2. The fiber rubber mesh layers prepared in step S1 are laid in layers in batches according to the actual use of the obtained product to form a fiber rubber foamed concrete product with a sandwich structure.
2. The method for preparing fiber-rubber foam concrete with layered and directional foam according to claim 1, characterized in that: In step S1, 800 grams of rubber particles are evenly sprinkled on each square meter of the polypropylene fiber web.
3. The method for preparing fiber-rubber foam concrete with layered and directional foam according to claim 1, characterized in that: In step S1, the length of the polypropylene fiber is 6-18 mm, and the particle size of the rubber particles is 0.3-0.4 mm.
4. The method for preparing fiber-rubber foam concrete with layered and directional foam according to claim 1, characterized in that: In step S2, cement slurry is prepared from 540-560 parts of cement, 140-160 parts of fly ash, and 240-260 parts of water.
5. The method for preparing fiber-rubber foam concrete with layered and directional foam according to claim 1, characterized in that: In step S2, the mass ratio between the foaming agent and water is 1:40; the mass ratio between the foaming solution and the cement slurry is 1:18.
6.
6. The method for preparing fiber-rubber foam concrete with layered and directional foam according to claim 1, characterized in that: In step S3, a fiber rubber mesh is laid every 20 mm; and the obtained fiber rubber foam concrete product is cured for 28 days under standard curing conditions.