HPC slab structure with thermal insulation performance

Abstract

The application relates to the technical field of plate materials, in particular to an HPC plate block structure with heat preservation and insulation performance, which comprises an HPC composite plate, the HPC composite plate comprises an HPC core layer, interface bonding layers are fixed on the two sides of the HPC core layer, a heat preservation layer is fixed on one side of the interface bonding layer, and a surface protection layer is fixed on the surface of one heat preservation layer; the technical scheme of "graphene modified aerogel precise modification of HPC + layered structure optimization" is adopted; the super-high structural strength and excellent heat preservation performance are considered; the compressive strength of the HPC plate block is greater than or equal to 120 MPa, meanwhile, the heat conductivity coefficient is reduced by more than 30%, an additional heat preservation layer is not needed, and the structure and the heat preservation are integrated.

Description

Technical Field

[0001] This invention relates to the field of sheet technology, specifically to an HPC sheet structure with thermal insulation properties. Background Technology

[0002] With the rapid development of low-carbon prefabricated high-rise buildings, there is an integrated requirement for building components to combine structural load-bearing capacity, thermal insulation, and convenient construction. Ultra-high performance concrete (HPC) is widely used in prefabricated components due to its advantages such as ultra-high strength (compressive strength ≥100MPa), high toughness, and high durability. However, ordinary HPC has a high thermal conductivity of 1.5-2.0W / (m·K), resulting in poor thermal insulation performance, requiring the addition of an extra insulation layer.

[0003] The traditional solution is a composite structure of "HPC structural layer + independent insulation layer", which has the following problems: First, the bonding between the insulation layer and the structural layer is poor, and it is easy to fall off and become hollow after long-term use, affecting the integrity and durability of the component; Second, the construction process is complicated, requiring separate pouring of the structural layer, laying of the insulation layer, and protective treatment, which reduces the efficiency of prefabricated construction; Third, the insulation layer is mostly made of organic materials (such as polystyrene board), which has insufficient fire resistance and poor coordination with HPC deformation, making it prone to cracking and leakage.

[0004] To address the aforementioned issues, existing technologies attempt to combine thermal insulation materials with HPC. Among these, graphene-modified aerogel is preferred due to its extremely low thermal conductivity (0.015-0.03 W / (m·K)). However, it faces a core technological bottleneck: aerogel is porous and lightweight (density 0.05-0.2 g / cm³) with extremely low strength (compressive strength only 0.1-1 MPa), which conflicts with the low water-cement ratio and high density of HPC. Simple addition can easily lead to a sharp drop in HPC strength and an increase in internal defects. At the same time, the surface of aerogel is hydrophobic and prone to agglomeration, resulting in poor interfacial adhesion with the cement matrix, making it impossible to simultaneously achieve "structural strength retention" and "improved thermal insulation performance".

[0005] Furthermore, the anchor rods embedded during the processing of the sheet metal are at risk of being bent by collisions during transportation. Summary of the Invention

[0006] The purpose of this invention is to provide an HPC panel structure with thermal insulation properties to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an HPC panel structure with thermal insulation properties, comprising an HPC composite panel, wherein the HPC composite panel comprises an HPC core layer, both sides of the HPC core layer are fixed with an interface adhesive layer, one side of the interface adhesive layer is fixed with an insulation layer, and a surface protective layer is fixed on the surface of one insulation layer. An embedded seat is pre-embedded inside the HPC core layer. A connecting seat is fixed on the surface of the embedded seat. A threaded sleeve is fixed inside the connecting seat. A metal threaded connector is screwed into the threaded sleeve. An anchor rod is fixed at one end of the metal threaded connector. The anchor rod penetrates the HPC core layer, the interface bonding layer and another insulation layer. One end of the connector has a reserved groove, and multiple inserts are inserted into the inner ring surface of the reserved groove. A spring is fixed between the insert and the outer ring surface of the reserved groove, and one end of the insert is inserted into a slot on the surface of the anchor rod.

[0008] Preferably, the surface protective layer is made of aerogel-free material, the insulation layer is made of graphene-modified aerogel, the interface bonding layer is made of a composite of steel fiber and polypropylene fiber, and the HPC core layer is made of ultra-high strength HPC with a compressive strength ≥150MPa.

[0009] Preferably, the graphene-modified aerogel comprises: 1) Cementitious Material System P·O 52.5R Portland cement: 700-750kg, accounting for 60%-65% of the total cementitious materials, providing core strength and hydration foundation, controlling specific surface area ≥350m². 2 / kg, free calcium oxide content ≤1.0%; Densified silica fume: 220-250kg, accounting for 20%-25% of the total cementitious material, with an active SiO2 content ≥95% and a particle size of 0.1-1μm. It fills cement gaps, strengthens the interface transition zone, and improves density. Grade I ultrafine fly ash: 100-120kg, accounting for 10%-15% of the total cementitious materials, water requirement ≤95%, loss on ignition ≤5%, optimizes slurry fluidity and reduces heat of hydration; Nano silica: 15-20kg, accounting for 1.5%-2% of the total cementitious material, with a particle size of 20-50nm. It is homologous to aerogel SiO2 and strengthens the interfacial bonding between aerogel and cement matrix. Total amount of cementitious material: 1035-1140kg, water-cement ratio strictly controlled at 0.18-0.20; 2) Aggregate system Ultrafine quartz sand: 1200-1300kg, particle size distribution 0.1-0.6mm, of which 0.1-0.3mm accounts for 40% and 0.3-0.6mm accounts for 60%, mud content ≤0.5%, Mohs hardness ≥7, to achieve close packing and reduce internal porosity; Graphene-modified aerogel microspheres: Two doping methods are used: Internal admixture method (replacement of cementitious materials): 21-34kg, accounting for 2%-3% of the total cementitious materials, strength retention rate ≥90%, mild heat preservation improvement, suitable for load-bearing scenarios; External admixture method (replacing fine aggregate): 36-65kg, accounting for 3%-5% of the total amount of ultrafine quartz sand, with more significant thermal insulation effect and strength retention rate ≥85%, suitable for thermal insulation priority scenarios; Key indicators for aerogels: particle size 10-100μm (spherical / quasi-spherical), density 0.1-0.15g / cm³. 3 The thermal conductivity is ≤0.025W / (m·K), and the surface is modified with silane coupling agent to avoid agglomeration and interfacial debonding. 3) Admixture system Polycarboxylate superplasticizer: 25-30kg, accounting for 2.0%-2.5% of the total cementitious material, water reduction rate ≥30%, solid content ≥40%, suitable for low water-cement ratio slurries, improving fluidity and aerogel dispersibility; Polyether-based plasticizer: 2-3 kg, accounting for 0.2%-0.3% of the total cementitious material, to prevent aerogel from absorbing slurry and causing a sudden drop in slurry fluidity, extend workability, initial spread ≥600 mm, 1 hour spread ≥550 mm; Organosilicon defoamer: 0.5-1kg, accounting for 0.05%-0.1% of the total amount of cementitious materials, to eliminate harmful bubbles introduced during the mixing process and avoid internal defects; 4) Fiber system Copper-plated microfiber steel: volume fraction 1.5%-2.0%, diameter 0.18-0.22mm, length 12-15mm, tensile strength ≥2850MPa, fiber spacing ≤20mm, bridging interface cracks and compensating for the toughness loss introduced by aerogel; 5) Mixing water Drinking water: 186-228kg, calculated based on a water-cement ratio of 0.18-0.20, the water temperature needs to be controlled at 20±5℃ to avoid high temperature accelerating hydration and causing premature coagulation of the slurry.

[0010] Preferably, the reserved groove is an annular groove, a retaining ring is inserted and fixed at the opening of the reserved groove, multiple through holes are opened on the inner annular surface of the reserved groove, the insert block and the through hole correspond one-to-one, and the insert block is inserted into the through hole. The end of the insert block that extends into the inside of the connector is provided with a bevel, and the slot is an annular groove.

[0011] Preferably, the other end of the insert has a notch, one end of the spring is fixed in the notch, and a rubber support block is provided on the inner side of the spring. The rubber support block is fixed between the outer ring surface of the notch and the reserved groove.

[0012] Preferably, a rubber gasket is fixed inside the threaded sleeve, and the rubber gasket is held between the threaded sleeve and the metal screw joint and undergoes elastic deformation.

[0013] Preferably, both the pre-embedded seat and the connecting seat are provided in multiple sets, wherein a plastic plug is inserted into the reserved hole where the anchor rod is not installed. The plastic plug is a "T"-shaped cylinder, and a plastic screw connector is fixed to one end of the plastic plug. The plastic screw connector is inserted into and screwed into the threaded sleeve.

[0014] Compared with the prior art, the beneficial effects of the present invention are: The HPC panel structure with thermal insulation properties proposed in this invention adopts the technical solution of "precise modification of HPC with graphene-modified aerogel + layered structure optimization" to achieve both ultra-high structural strength and excellent thermal insulation performance: the compressive strength of the HPC panel is ≥120MPa, while the thermal conductivity is reduced by more than 30%, eliminating the need for additional insulation layers and realizing "structure-insulation integration".

[0015] By setting (6) as a detachable structure, (6) can be installed on the board via (3) after transportation, thus avoiding collision and bending during transportation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Sectional view of the structure at point AA; Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point B; Figure 4 for Figure 2 Enlarged schematic diagram of the structure at point C; Figure 5 for Figure 2 Enlarged schematic diagram of the structure at point D; Figure 6 for Figure 3 Enlarged schematic diagram of the structure at point E in the middle; Figure 7 This is a schematic diagram of the connection structure between the embedded seat and the connecting seat of the present invention; Figure 8 This is a schematic diagram of the insert structure of the present invention.

[0017] In the diagram: HPC composite board 1, HPC core layer 101, interface adhesive layer 102, insulation layer 103, surface protective layer 104, reserved hole 105, embedded seat 2, connecting seat 3, reserved groove 301, through hole 302, retaining ring 303, insert block 4, notched groove 401, spring 402, rubber support block 403, threaded sleeve 5, rubber gasket 501, anchor rod 6, metal screw joint 601, slot 602, plastic plug 7, plastic screw joint 701. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1 to 8 This invention provides a technical solution: an HPC panel structure with thermal insulation properties, comprising an HPC composite panel 1, characterized in that: the HPC composite panel 1 includes an HPC core layer 101, with interface bonding layers 102 fixed on both sides of the HPC core layer 101, an insulation layer 103 fixed on one side of the interface bonding layer 102, and a surface protective layer 104 fixed on the surface of one insulation layer 103; the surface protective layer 104 is made of aerogel-free material, the insulation layer 103 is made of graphene-modified aerogel, the interface bonding layer 102 is made of a composite of steel fiber and polypropylene fiber, and the HPC core layer 101 is made of ultra-high strength HPC with a compressive strength ≥150 MPa.

[0020] Graphene-modified aerogels include: 1) Cementitious Material System P·O 52.5R Portland cement: 700-750kg, accounting for 60%-65% of the total cementitious materials, providing core strength and hydration foundation, controlling specific surface area ≥350m². 2 / kg, free calcium oxide content ≤1.0%; Densified silica fume: 220-250kg, accounting for 20%-25% of the total cementitious material, with an active SiO2 content ≥95% and a particle size of 0.1-1μm. It fills cement gaps, strengthens the interface transition zone, and improves density. Grade I ultrafine fly ash: 100-120kg, accounting for 10%-15% of the total cementitious materials, water requirement ≤95%, loss on ignition ≤5%, optimizes slurry fluidity and reduces heat of hydration; Nano silica: 15-20kg, accounting for 1.5%-2% of the total cementitious material, with a particle size of 20-50nm. It is homologous to aerogel SiO2 and strengthens the interfacial bonding between aerogel and cement matrix. Total amount of cementitious material: 1035-1140kg, water-cement ratio strictly controlled at 0.18-0.20; 2) Aggregate system Ultrafine quartz sand: 1200-1300kg, particle size distribution 0.1-0.6mm, of which 0.1-0.3mm accounts for 40% and 0.3-0.6mm accounts for 60%, mud content ≤0.5%, Mohs hardness ≥7, to achieve close packing and reduce internal porosity; Graphene-modified aerogel microspheres: Two doping methods are used: Internal admixture method (replacement of cementitious materials): 21-34kg, accounting for 2%-3% of the total cementitious materials, strength retention rate ≥90%, mild heat preservation improvement, suitable for load-bearing scenarios; External admixture method (replacing fine aggregate): 36-65kg, accounting for 3%-5% of the total amount of ultrafine quartz sand, with more significant thermal insulation effect and strength retention rate ≥85%, suitable for thermal insulation priority scenarios; Key indicators for aerogels: particle size 10-100μm (spherical / quasi-spherical), density 0.1-0.15g / cm³. 3 The thermal conductivity is ≤0.025W / (m·K), and the surface is modified with silane coupling agent to avoid agglomeration and interfacial debonding. Basic mix proportion table for two addition methods ; 3) Admixture system Polycarboxylate superplasticizer: 25-30kg, accounting for 2.0%-2.5% of the total cementitious material, water reduction rate ≥30%, solid content ≥40%, suitable for low water-cement ratio slurries, improving fluidity and aerogel dispersibility; Polyether-based plasticizer: 2-3 kg, accounting for 0.2%-0.3% of the total cementitious material, to prevent aerogel from absorbing slurry and causing a sudden drop in slurry fluidity, extend workability, initial spread ≥600 mm, 1 hour spread ≥550 mm; Organosilicon defoamer: 0.5-1kg, accounting for 0.05%-0.1% of the total amount of cementitious materials, to eliminate harmful bubbles introduced during the mixing process and avoid internal defects; 4) Fiber system Copper-plated microfiber steel: volume fraction 1.5%-2.0%, diameter 0.18-0.22mm, length 12-15mm, tensile strength ≥2850MPa, fiber spacing ≤20mm, bridging interface cracks and compensating for the toughness loss introduced by aerogel; 5) Mixing water Drinking water: 186-228kg, calculated based on a water-cement ratio of 0.18-0.20, the water temperature needs to be controlled at 20±5℃ to avoid high temperature accelerating hydration and causing premature coagulation of the slurry.

[0021] To facilitate the assembly of anchor bolt 6 and connecting seat 3, the following was proposed: An embedded seat 2 is pre-embedded inside the HPC core layer 101. A connecting seat 3 is fixed to the surface of the embedded seat 2. A threaded sleeve 5 is fixed inside the connecting seat 3. A metal threaded connector 601 is screwed into the inside of the threaded sleeve 5. An anchor rod 6 is fixed to one end of the metal threaded connector 601. The anchor rod 6 penetrates the HPC core layer 101, the interface bonding layer 102, and another insulation layer 103. A rubber gasket 501 is fixed inside the threaded sleeve 5. The rubber gasket 501 is clamped between the threaded sleeve 5 and the metal threaded connector 601 and undergoes elastic deformation. Multiple sets of embedded seats 2 and connecting seats 3 are provided. A plastic plug 7 is inserted into the reserved hole 105 where the anchor rod 6 is not installed. The plastic plug 7 is a "T"-shaped cylinder. A plastic threaded connector 701 is fixed to one end of the plastic plug 7. The plastic threaded connector 701 is inserted into and screwed into the threaded sleeve 5.

[0022] To facilitate the transportation of the sheet metal, anchor rods 6 are not installed during transportation, thus saving transportation space and preventing the anchor rods 6 from being bent during transportation after installation on the sheet metal. When installing anchor rods 6, insert the end of anchor rod 6 equipped with metal threaded connector 601 into the reserved hole 105, push anchor rod 6 into the reserved hole 105 until the metal threaded connector 601 abuts against the groove of threaded sleeve 5, and then screw anchor rod 6 to screw the metal threaded connector 601 into threaded sleeve 5. During transportation, insert plastic plug 7 into reserved hole 105 and screw plastic plug 7 to screw plastic threaded connector 701 into threaded sleeve 5 to prevent foreign objects from entering reserved hole 105.

[0023] To strengthen the connection between anchor bolt 6 and connecting seat 3, the following was proposed: One end of the connecting seat 3 has a reserved groove 301. Multiple inserts 4 are inserted into the inner ring surface of the reserved groove 301. A spring 402 is fixed between the inserts 4 and the outer ring surface of the reserved groove 301. One end of the insert 4 is inserted into the slot 602 opened on the surface of the anchor rod 6. The reserved groove 301 is an annular groove. A retaining ring 303 is inserted and fixed at the opening of the reserved groove 301. Multiple through holes 302 are opened on the inner ring surface of the reserved groove 301. The inserts 4 and the through holes 302 correspond one-to-one, and the inserts 4 are inserted into the through holes 302. One end of the insert 4 that extends into the connecting seat 3 has a bevel. The slot 602 is an annular groove. The other end of the insert 4 has a notch 401. One end of the spring 402 is fixed in the notch 401. A rubber support block 403 is provided on the inner side of the spring 402. The rubber support block 403 is fixed between the notch 401 and the outer ring surface of the reserved groove 301.

[0024] After one end of the anchor rod 6 is pushed into the connecting seat 3, as the anchor rod 6 continues to advance, the end of the anchor rod 6 pushes the insert block 4. When the insert block 4 retracts into the reserved groove 301, it compresses the spring 402 and the rubber support block 403, causing elastic deformation. When the slot 602 and the insert block 4 correspond, the spring 402 and the rubber support block 403 rebound and push the insert block 4 into the slot 602, forming an anti-disengagement locking position between the connecting seat 3 and the anchor rod 6.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An HPC panel structure with thermal insulation properties, comprising an HPC composite panel (1), characterized in that: The HPC composite board (1) includes an HPC core layer (101), with an interface adhesive layer (102) fixed on both sides of the HPC core layer (101), an insulation layer (103) fixed on one side of the interface adhesive layer (102), and a surface protective layer (104) fixed on the surface of one insulation layer (103). An embedded seat (2) is pre-embedded inside the HPC core layer (101). A connecting seat (3) is fixed on the surface of the embedded seat (2). A threaded sleeve (5) is fixed inside the connecting seat (3). A metal threaded connector (601) is screwed into the threaded sleeve (5). An anchor rod (6) is fixed at one end of the metal threaded connector (601). The anchor rod (6) penetrates the HPC core layer (101), the interface bonding layer (102), and another insulation layer (103). One end of the connecting seat (3) is provided with a reserved groove (301). Multiple inserts (4) are inserted into the inner ring surface of the reserved groove (301). A spring (402) is fixed between the insert (4) and the outer ring surface of the reserved groove (301). One end of the insert (4) is inserted into the slot (602) opened on the surface of the anchor rod (6).

2. The HPC panel structure with thermal insulation properties according to claim 1, characterized in that: The surface protective layer (104) is made of aerogel-free material, the insulation layer (103) is made of graphene-modified aerogel, the interface bonding layer (102) is made of steel fiber and polypropylene fiber composite material, and the HPC core layer (101) is made of ultra-high strength HPC with a compressive strength ≥150MPa.

3. The HPC panel structure with thermal insulation properties according to claim 2, characterized in that: The graphene-modified aerogel comprises: 1) Cementitious Material System P·O 52.5R Portland cement: 700-750kg, accounting for 60%-65% of the total cementitious materials, providing core strength and hydration foundation, controlling specific surface area ≥350m². 2 / kg, free calcium oxide content ≤1.0%; Densified silica fume: 220-250kg, accounting for 20%-25% of the total cementitious material, with an active SiO2 content ≥95% and a particle size of 0.1-1μm. It fills cement gaps, strengthens the interface transition zone, and improves density. Grade I ultrafine fly ash: 100-120kg, accounting for 10%-15% of the total cementitious materials, water requirement ≤95%, loss on ignition ≤5%, optimizes slurry fluidity and reduces heat of hydration; Nano silica: 15-20kg, accounting for 1.5%-2% of the total cementitious material, with a particle size of 20-50nm. It is homologous to aerogel SiO2 and strengthens the interfacial bonding between aerogel and cement matrix. Total amount of cementitious material: 1035-1140kg, water-cement ratio strictly controlled at 0.18-0.20; 2) Aggregate system Ultrafine quartz sand: 1200-1300kg, particle size distribution 0.1-0.6mm, of which 0.1-0.3mm accounts for 40% and 0.3-0.6mm accounts for 60%, mud content ≤0.5%, Mohs hardness ≥7, to achieve close packing and reduce internal porosity; Graphene-modified aerogel microspheres: Two doping methods are used: Internal admixture method (replacement of cementitious materials): 21-34kg, accounting for 2%-3% of the total cementitious materials, strength retention rate ≥90%, mild heat preservation improvement, suitable for load-bearing scenarios; External admixture method (replacing fine aggregate): 36-65kg, accounting for 3%-5% of the total amount of ultrafine quartz sand, with more significant thermal insulation effect and strength retention rate ≥85%, suitable for thermal insulation priority scenarios; Key indicators for aerogels: particle size 10-100μm (spherical / quasi-spherical), density 0.1-0.15g / cm³. 3 The thermal conductivity is ≤0.025W / (m·K), and the surface is modified with silane coupling agent to avoid agglomeration and interfacial debonding. 3) Admixture system Polycarboxylate superplasticizer: 25-30kg, accounting for 2.0%-2.5% of the total cementitious material, water reduction rate ≥30%, solid content ≥40%, suitable for low water-cement ratio slurries, improving fluidity and aerogel dispersibility; Polyether-based plasticizer: 2-3 kg, accounting for 0.2%-0.3% of the total cementitious material, to prevent aerogel from absorbing slurry and causing a sudden drop in slurry fluidity, extend workability, initial spread ≥600 mm, 1 hour spread ≥550 mm; Organosilicon defoamer: 0.5-1kg, accounting for 0.05%-0.1% of the total amount of cementitious materials, to eliminate harmful bubbles introduced during the mixing process and avoid internal defects; 4) Fiber system Copper-plated microfiber steel: volume fraction 1.5%-2.0%, diameter 0.18-0.22mm, length 12-15mm, tensile strength ≥2850MPa, fiber spacing ≤20mm, bridging interface cracks and compensating for the toughness loss introduced by aerogel; 5) Mixing water Drinking water: 186-228kg, calculated based on a water-cement ratio of 0.18-0.20, requires water temperature control at 20±5℃ to avoid high temperature accelerating hydration and causing premature coagulation of the slurry.

4. The HPC panel structure with thermal insulation properties according to claim 1, characterized in that: The reserved groove (301) is an annular groove. A retaining ring (303) is inserted and fixed at the opening of the reserved groove (301). Multiple through holes (302) are opened on the inner annular surface of the reserved groove (301). The insert (4) and the through holes (302) correspond one to one. The insert (4) is inserted into the through hole (302). One end of the insert (4) that extends into the connector (3) is provided with a slope. The slot (602) is an annular groove.

5. The HPC panel structure with thermal insulation properties according to claim 4, characterized in that: The other end of the insert (4) is provided with a notch (401), one end of the spring (402) is fixed in the notch (401), and a rubber support block (403) is provided on the inner side of the spring (402). The rubber support block (403) is fixed between the outer ring surface of the notch (401) and the reserved groove (301).

6. The HPC panel structure with thermal insulation properties according to claim 1, characterized in that: A rubber gasket (501) is fixed inside the threaded sleeve (5), and the rubber gasket (501) is held between the threaded sleeve (5) and the metal screw connector (601) and undergoes elastic deformation.

7. The HPC panel structure with thermal insulation properties according to claim 1, characterized in that: Both the pre-embedded seat (2) and the connecting seat (3) are provided with multiple sets, in which a plastic plug (7) is inserted into the reserved hole (105) where the anchor rod (6) is not installed. The plastic plug (7) is a "T" shaped cylinder. One end of the plastic plug (7) is fixed with a plastic screw connector (701). The plastic screw connector (701) is inserted into and screwed into the threaded sleeve (5).

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