High toughness sandwich wall panel

Abstract

A high-toughness sandwich wall panel includes a foamed cement core material in the middle and high-ductility concrete layers on both sides of the foamed cement core material. The foamed cement core material has several through holes in its middle, and high-ductility concrete columns are fixedly connected to the high-ductility concrete layers on both sides within these through holes. The high-ductility concrete layer has a serrated surface on the side facing the foamed cement core material. The depth of the serrated surface of the high-ductility concrete layer is 1-1.5 mm. The inner diameter of the through holes is 30 mm, and the distance between the through holes is 60 cm. This application places the foamed cement core material between two high-ductility concrete layers. Because the foamed cement core material can solidify quickly, it can be industrially produced relatively quickly, which greatly improves the efficiency of sandwich panel production and the quality of the resulting product.

Description

Technical Field

[0001] This application relates to a high-toughness sandwich wall panel. Background Technology

[0002] Foamed cement is a new type of lightweight thermal insulation material containing numerous closed pores. It is produced by mechanically foaming a foaming agent using a foaming machine's foaming system, uniformly mixing the foam with cement slurry, and then using the foaming machine's pumping system for on-site pouring or mold molding. It is a type of aerated insulation material, characterized by the formation of closed foam pores within the concrete, giving it lightweight and thermal insulation properties. However, due to its internal air bubbles, it is relatively fragile in its early stages and easily damaged. The initial and complete hardening processes are both lengthy, which not only poses certain risks to the final product's shape but also limits its application scenarios. Summary of the Invention

[0003] To address the aforementioned problems, this application proposes a high-toughness sandwich wall panel, comprising a foamed cement core material in the middle and high-ductility concrete layers on both sides of the foamed cement core material. The foamed cement core material has several through holes in its middle, within which high-ductility concrete columns are fixedly connected to the high-ductility concrete layers on both sides. The high-ductility concrete layer has a serrated surface on the side facing the foamed cement core material; the depth of the serrated surface of the high-ductility concrete layer is 1-1.5 mm; the inner diameter of the through holes is 30 mm, and the distance between the through holes is 60 cm. This application places the foamed cement core material between two high-ductility concrete layers. Because the foamed cement core material can solidify rapidly, it can be industrially produced relatively quickly, greatly improving the efficiency of sandwich panel production and the quality of the resulting product. The high-ductility concrete layers of this application can be prepared using ordinary high-ductility concrete, and the foamed cement core material can also be prepared using ordinary foamed cement.

[0004] Preferably, the high-ductility concrete layer comprises the following raw materials in parts by weight: cement: 30-40 parts; sand: 20-30 parts; fly ash: 8-12 parts; early strength agent: 1-3 parts; water-reducing agent: 0.1-0.3 parts; PVA fiber, volume fraction: 1-3%; palm fiber: 0.5-1.5 parts.

[0005] Preferably, the foamed cement core material comprises the following raw materials in parts by weight: cement: 40-60 parts; fly ash: 15-25 parts; silica fume: 3-7 parts; calcium oxide: 3-5 parts; gypsum: 5-10 parts; calcium aluminate: 6-10 parts; PP short fiber: 0.4-0.6 parts; foaming agent: 1-3 parts; foam stabilizer: 0.1-0.3 parts. In this application, the gypsum, calcium aluminate, and calcium oxide in the foamed cement act immediately, enabling rapid hardening; while the silica fume exerts a significant effect after several hours, improving the final strength. The composite of PP short fiber and other substances prevents cracking and other adverse phenomena during the later secondary hardening process. The reason this application uses a composite of cement and fly ash as the base material, with cement as the main component, is to avoid internal stress between the initial and secondary hardening stages, which could affect its properties or even cause cracking and other phenomena that must be absolutely avoided.

[0006] Preferably, the calcium aluminate is in an amorphous state; the gypsum is β-hemihydrate gypsum; and the length of the PP short fibers is 12-15 mm.

[0007] Preferably, the foamed cement core material further includes the following parts by weight of palm fiber: 0.5-1.5 parts, wherein the length of the palm fiber is 30-50 mm.

[0008] Preferably, the silica fume contains not less than 90 wt% silica; and the calcium oxide contains not less than 90 wt% calcium oxide.

[0009] Preferably, the preparation of the foamed cement includes the following steps:

[0010] Stir the solid portion thoroughly.

[0011] The foaming agent and foam stabilizer are placed in water to form a water-based component;

[0012] Rapidly hardening foamed cement is obtained by thoroughly mixing the solid and water-based components.

[0013] The solid base is a mixture of cement, fly ash, silica fume, calcium oxide, gypsum, calcium aluminate, PP short fibers, and palm fiber;

[0014] The water-based component is introduced into the solid component and then thoroughly mixed.

[0015] Preferably, the foamed cement is used in a water-based environment with a water-to-material mass ratio of 0.4-0.6; the foaming agent is hydrogen peroxide. The foamed cement core material of this application uses a water-based environment and hydrogen peroxide as the foaming agent primarily because, during the overall reaction process, in an environment containing calcium oxide, hydrogen peroxide can undergo directional pyrolysis and foaming. This ensures that, provided the solid components are uniformly mixed, the foaming quality is very high, reducing the difficulty of preparing foamed cement and improving the final property parameters of the foamed cement core material.

[0016] Preferably, the sand in the high-ductility concrete layer is graded sand, wherein: 20-30 mesh sand is 10wt%-20wt%; 40-70 mesh sand is 60wt%-70wt%; and the remainder is 70-100 mesh sand.

[0017] Preferably, the length of the PVA fibers in the high-ductility concrete layer is 12-15 mm; the length of the palm fibers is 30-50 mm. The purpose of using graded sand in this application is to better mix it into cement and fly ash, avoiding insufficient internal and external bonding strength, thereby enabling better bonding with the foamed cement core material.

[0018] Preferably, it is produced through the following steps:

[0019] S1. Lay the first layer of high-ductility concrete, with the top surface set in a tooth shape, and the tooth depth is 1-1.5cm;

[0020] S2. Foamed cement core material is set on the first layer of high ductility concrete. After the foamed cement core material has set, several through holes are drilled. The inner diameter of the through holes is 3cm and the distance between the through holes is 60cm.

[0021] S3. A second layer of high-ductility concrete is applied to the foamed cement core material.

[0022] This application can bring the following beneficial effects:

[0023] 1. This application places foamed cement core material between two layers of high ductility concrete. Since foamed cement core material can solidify quickly, it can be industrialized relatively quickly. This greatly facilitates the efficiency of sandwich panel production and the quality of the product, and eliminates the need for the original mesh cloth and steel reinforcement components.

[0024] 2. The gypsum, calcium aluminate, and calcium oxide in the foamed cement of this application take effect from the beginning, enabling rapid hardening; while silica fume takes effect significantly after a few hours, improving the final strength. In addition, the composite of PP short fibers and other materials ensures that no adverse phenomena such as cracking will occur during the secondary hardening process. The reason why the base material of this application uses a composite of cement and fly ash, with cement as the main component, is to avoid internal stress between the primary and secondary hardening, which would affect its properties and even cause phenomena such as cracking that must be absolutely avoided.

[0025] 3. The purpose of using graded sand in this application is to better mix it into cement and fly ash, avoid insufficient internal bonding force and external bonding force, and thus enable it to better bond with foamed cement core material. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0027] Figure 1 This is a schematic diagram of the structure of this application. Detailed Implementation

[0028] To clearly illustrate the technical features of this solution, the following detailed description, in conjunction with the accompanying drawings, will be provided.

[0029] S1. Raw material preparation:

[0030] Foamed cement is made by mixing the following raw materials:

[0031] S11. Mixing of the solid portion:

[0032] After thoroughly mixing cement, fly ash, silica fume, calcium oxide, gypsum, calcium aluminate, PP short fibers, and palm fibers, a homogenization process is performed to obtain the solid component. The calcium aluminate is in an amorphous state; the gypsum is β-hemihydrate gypsum; the length of the PP short fibers is 12-15 mm; and the length of the palm fibers is 30-50 mm. The silica fume contains no less than 90 wt% silicon dioxide; and the calcium oxide contains no less than 90 wt% calcium oxide. The specific mass values ​​are shown in Table 1.

[0033] Table 1:

[0034]

[0035] S12. Synthesis of the water-based component:

[0036] Hydrogen peroxide and foam stabilizer are placed in water corresponding to the mass of the solid part obtained in S1, and stirred evenly to obtain the water-based part;

[0037] S13. Mixing:

[0038] The water-based component is mixed in while the solid component is being stirred until it is completely mixed to obtain foamed cement.

[0039] S14. High-ductility concrete is made by mixing the following raw materials:

[0040] The high-ductility concrete layer contains cement, sand, fly ash, early-strength agent, water-reducing agent, PVA fiber, and palm fiber. The sand in the high-ductility concrete layer is graded sand, wherein: 20-30 mesh sand accounts for 10wt%-20wt%; 40-70 mesh sand accounts for 60wt%-70wt%; and the remainder is 70-100 mesh sand. The length of the PVA fiber in the high-ductility concrete layer is 12-15mm; and the length of the palm fiber is 30-50mm.

[0041] Table 2:

[0042]

[0043] S2. Lay the first layer of high-ductility concrete 1, with the top surface set in a tooth shape and the tooth depth being 1-1.5cm;

[0044] S3. Foamed cement core material 2 is set on the first layer of high ductility concrete 1. After the foamed cement core material 2 has set, several through holes 3 are drilled. The inner diameter of the through holes 3 is 3cm and the distance between the through holes 3 is 60cm.

[0045] S4. Set a second layer of high-ductility concrete 1 on the foamed cement core material 2, and measure S5 after curing for 3 hours;

[0046] S5. The impact resistance and bending load were determined according to GB / T23451-2009 Lightweight partition wall panels for building. The tooth depth, thickness of each layer and test parameters are shown in Table 3.

[0047] Table 3:

[0048]

[0049] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0050] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A high-toughness sandwich wall panel, characterized in that: It includes a foamed cement core material in the middle and high-ductility concrete layers on both sides of the foamed cement core material; the foamed cement core material has several through holes in the middle, and high-ductility concrete columns are fixedly connected to the high-ductility concrete on both sides in the through holes; the high-ductility concrete layer has a sawtooth surface on the side facing the foamed cement core material. The high-ductility concrete layer comprises the following raw materials in parts by weight: cement: 30-40 parts; sand: 20-30 parts; fly ash: 8-12 parts; early-strength agent: 1-3 parts; Water-reducing agent: 0.1-0.3 parts; PVA fiber, volume fraction: 1-3%; Palm fiber: 0.5-1.5 parts; The sand in the high-ductility concrete layer is graded sand, of which: 20-30 mesh sand is 10wt%-20wt%; 40-70 mesh sand is 60wt%-70wt%; and the remainder is 70-100 mesh sand. The foamed cement core material comprises the following raw materials in parts by weight: cement: 40-60 parts; fly ash: 15-25 parts; silica fume: 3-7 parts; calcium oxide: 3-5 parts; gypsum: 5-10 parts; calcium aluminate: 6-10 parts; PP short fiber: 0.4-0.6 parts; foaming agent: 1-3 parts; foam stabilizer: 0.1-0.3 parts; The foaming agent is hydrogen peroxide; The preparation of the foamed cement includes the following steps: Stir the solid portion thoroughly. The foaming agent and foam stabilizer are placed in water to form a water-based component; Rapidly hardening foamed cement is obtained by thoroughly mixing the solid and water-based components. The solid component is a mixture of cement, fly ash, silica fume, calcium oxide, gypsum, calcium aluminate, PP short fibers, and palm fiber. The water-based component is introduced into the solid component, and then thoroughly mixed. The foamed cement is used in a water-based environment with a water-to-cement mass ratio of 0.4-0.

6.

2. The high-toughness sandwich wall panel according to claim 1, characterized in that: The depth of the sawtooth surface of the high-ductility concrete layer is 1-1.5 mm; the inner diameter of the through hole is 30 mm, and the distance between the through holes is 60 cm.

3. The high-toughness sandwich wall panel according to claim 1, characterized in that: The calcium aluminate is in an amorphous state; the gypsum is β-hemihydrate gypsum; the PP short fibers are 12-15 mm in length; the foamed cement core material also includes the following parts by weight of palm fiber: 0.5-1.5 parts, the palm fiber being 30-50 mm in length.

4. A high-toughness sandwich wall panel according to claim 1, characterized in that: The silica content in the silica ash is not less than 90 wt%.

5. A high-toughness sandwich wall panel according to claim 1, characterized in that: The PVA fibers in the high-ductility concrete layer are 12-15 mm long, and the palm fibers are 30-50 mm long.

6. A high-toughness sandwich wall panel according to claim 1, characterized in that: It is produced through the following steps: S1. Lay the first layer of high-ductility concrete, with the top surface set in a tooth shape, and the tooth depth is 1-1.5cm; S2. Foamed cement core material is set on the first layer of high ductility concrete. After the foamed cement core material has set, several through holes are drilled. The inner diameter of the through holes is 3cm and the distance between the through holes is 60cm. S3. A second layer of high-ductility concrete is applied to the foamed cement core material.

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