A concrete insulation wallboard based on construction waste and preparation method thereof

Abstract

The invention discloses a concrete insulation wallboard based on construction waste, and relates to the technical field of concrete insulation wall preparation, including a concrete wallboard substrate, a polyurethane foam glue and a polyurethane foam board, wherein an interface agent is arranged on the outside of the concrete wallboard substrate, a polyurethane foam glue is arranged on the outside of the interface agent, and the polyurethane foam board is arranged on the outside of the concrete wallboard substrate through the polyurethane foam glue. The invention improves the shape of recycled coarse aggregate by a physical modification method, improves its use performance in concrete, thereby reducing the void ratio in concrete, improving the compactness and compressive strength of concrete, and ultrasonic waves generate high-frequency vibration and cavitation effect to make the organosilicon waterproofing agent evenly dispersed and react with the components in the aggregate to generate products to fill the pores of the recycled coarse aggregate, repair and fill the micro cracks on the surface of the aggregate due to crushing, improve the pore structure inside the aggregate, and improve the compactness of the aggregate to reduce the void ratio.

Description

Technical Field

[0001] The invention relates to the technical field of concrete thermal insulation wall preparation, in particular to a concrete thermal insulation wallboard based on construction waste and a preparation method thereof. Background Art

[0002] Using construction waste to prepare concrete insulation wall panels is an environmentally friendly and efficient building material innovation. Concrete insulation wall panels prepared with construction waste are mainly made of recycled coarse aggregate, lightweight concrete waste particles, cementitious materials, mineral admixtures, fine aggregates, admixtures and water. It makes full use of the renewable resources in construction waste and realizes the recycling of construction waste through scientific proportioning and preparation technology. At the same time, it has good thermal insulation performance and environmental protection.

[0003] The defects in the preparation of concrete insulation wall panels in the prior art are:

[0004] 1. Patent document US20210025158A1 discloses a flexible thermal insulation material concrete wall panel. During the preparation process of the concrete wall panel, the soil, silt, organic matter and other impurities on the surface of the raw materials cannot be effectively removed during the infiltration of the raw materials, which increases the porosity in the concrete and causes poor compactness and compressive strength of the concrete.

[0005] 2. Patent document CN215054276U discloses a construction waste concrete composite thermal insulation partition board. During the preparation process of the composite thermal insulation partition board, the wettability and adhesion between the raw materials are poor, the compatibility and affinity between the construction waste raw materials and the cement slurry are poor, and the combination effect of the construction waste raw materials and the cement slurry is not good.

[0006] 3. Patent document CN103102136B discloses a method for preparing lightweight thermal insulation wall panels using light concrete waste. The thermal insulation wall panels cannot effectively reduce heat transfer, resulting in poor thermal insulation effect of the wall, unable to meet good performance requirements in different environments, and shortening the service life of the thermal insulation wall panels.

[0007] 4. Patent document CN215211859U discloses a fully lightweight concrete insulation wall panel. The concrete insulation wall panel cannot effectively remove bubbles and excess moisture in the concrete during the preparation process. The concrete has poor density, and recycled materials such as construction waste do not blend well with concrete, which easily leads to cracks. Summary of the invention

[0008] The object of the present invention is to provide a concrete insulation wallboard based on construction waste and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a concrete insulation wall panel based on construction waste, comprising a concrete wall panel substrate, polyurethane foam glue and a polyurethane foam board, wherein an interface agent is arranged on the outer side of the concrete wall panel substrate, polyurethane foam glue is arranged on the outer side of the interface agent, and the polyurethane foam board is arranged on the outer side of the concrete wall panel substrate through the polyurethane foam glue.

[0010] Preferably, the concrete slurry for the concrete wall panel substrate is prepared by mixing 30 to 50 parts of recycled coarse aggregate, 15 to 20 parts of light concrete waste particles, 10 to 15 parts of cement, 8 to 12 parts of slag powder, 8 to 12 parts of fly ash, 8 to 10 parts of vermiculite, 8 to 10 parts of perlite, 2 to 3 parts of thickener, 1.5 to 2 parts of water reducer and water in a high-speed mixer.

[0011] A method for preparing a concrete thermal insulation wallboard based on construction waste comprises the following steps: 1. coarse aggregate infiltration; 2. concrete slurry preparation; 3. pouring and pressurizing; 4. curing treatment; 5. thermal insulation performance post-treatment.

[0012] Preferably, the coarse aggregate infiltration steps are as follows: Step 1: Coarse aggregate pretreatment: soak the recycled coarse aggregate in an acidic solution, remove the soil, silt, and organic impurities on the surface by stirring, rinsing, etc., improve the smoothness of the particle surface and reduce the surface dust content; Step 2: Chemical slurry ultrasonic treatment: completely immerse the pretreated recycled coarse aggregate in an organosilicon waterproofing agent, and the ultrasonic wave generates high-frequency vibration and cavitation effect, so that the organosilicon waterproofing agent is evenly dispersed and reacts with the components in the aggregate to produce products to fill the pores of the recycled coarse aggregate. The ultrasonic frequency of the ultrasonic equipment is controlled at 40 to 55 kHz, the ultrasonic dispersion time is 20 to 35 minutes, and the recycled coarse aggregate after the pores are filled is dried; Step 3: Protective film formation: completely immerse the recycled coarse aggregate after the pores are filled in a surfactant, the immersion time is 20 to 30 minutes, and the surfactant forms a protective film on the surface of the recycled coarse aggregate to improve its wettability and adhesion.

[0013] Preferably, the concrete slurry preparation steps are as follows: put the wetted coarse aggregate, lightweight concrete waste particles, cement, slag powder, fly ash, vermiculite, perlite, thickener, water and other raw materials into a mixer in proportion and mix them evenly, mix and stir at 45°C for 10 to 15 minutes at a speed of 300 r / min to form concrete slurry.

[0014] Preferably, the pouring and pressurizing steps are as follows: Step 1: Mold pouring: After applying a release agent to the mold surface, pour the stirred concrete slurry evenly to the bottom of the mold and vibrate to make the concrete dense, place the pre-cut polystyrene board flat on the concrete surface, lay a steel grid above the insulation core material to ensure that the connection between the polystyrene board and the outer layer of concrete is firm, pour another layer of concrete on the steel grid to ensure that the concrete is firmly connected to the polystyrene board and the steel grid, and compact and flatten the surface of the exterior wall panel to ensure that the surface is flat; Step 2: Vacuum pressurization: Use a hydraulic pump to evenly apply acrylic resin to the spray gun Spray on the concrete surface, place a vacuum bag on the concrete surface sprayed with polymer resin and seal it, connect the vacuum bag to the vacuum pump, start the vacuum pump to start extracting the air inside the concrete and infiltrating the acrylic resin into the concrete, maintain the vacuum state for 3min to 5min, so that the acrylic resin can fully penetrate into the concrete, and at the same time, the excess moisture and air in the concrete can be discharged, turn off the vacuum pump and remove the vacuum bag, wait for the acrylic resin to cure naturally to obtain the concrete wall panel substrate; Step 3 Wall inspection: Conduct quality inspection on the size, strength and thermal insulation performance of the manufactured concrete wall panel substrate.

[0015] Preferably, the curing treatment steps are as follows: Step 1: Normal pressure steam curing: 24 hours after the wall panel is cast, the concrete wall panel substrate is placed in a steam curing box and steam cured at 50°C to 65°C for 6 to 8 hours; Step 2: Temperature and pressure curing: During the curing time, the temperature and pressure of the steam curing are gradually increased to promote the molding and hardening of the cement. After the steam curing is completed, the wall panel is taken out for cleaning and inspection and examination; Step 3: Natural curing: The concrete wall panel substrate after normal pressure steam curing is subjected to water sprinkling curing or film cloth curing.

[0016] Preferably, the thermal insulation performance post-processing steps are as follows: Step 1: Base wall treatment: remove oil stains, floating dust and debris on the wall to ensure that the flatness of the wall meets the requirements. If there are too large concave and convex parts on the wall, cement mortar should be used for leveling; Step 2: Pasting pretreatment: cut out a polyurethane foam board that adapts to the size and shape of the wall, and apply a layer of special interface agent on the wall to improve the bonding force between the polyurethane foam board and the wall; Step 3: Adhesive application: apply polyurethane foam glue around one side panel of the polyurethane foam board, and scrape 8 glue joints on the same side. The spacing between the glue joints is controlled at 200mm and evenly arranged. The polyurethane foam board coated with adhesive is gently pressed on the wall of the concrete wallboard substrate to ensure that it is completely fitted with the wall, and use tools to evenly squeeze the bonding mortar to make close contact with the wall; Step 4: Overall inspection: After the pasting is completed, the pasting flatness, verticality and sealing of the polyurethane foam board are checked.

[0017] Preferably, the polyurethane foam adhesive has a coating width of 4.5 to 5 cm and a thickness of 0.8 to 1 cm, and the adhesive joint has a diameter of 10 cm and a thickness of 10 mm.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention improves the shape of recycled coarse aggregate through a physical modification method, reduces irregular particles, improves its performance in concrete, removes impurities such as soil, silt, and organic matter on the surface of recycled coarse aggregate, improves the cleanliness of aggregate, ensures the uniformity and stability of recycled coarse aggregate, thereby reducing the void ratio in concrete, improving the compactness and compressive strength of concrete, and ultrasonic waves generate high-frequency vibration and cavitation effect to make the organosilicon waterproofing agent evenly dispersed and react with the components in the aggregate to generate products to fill the pores of the recycled coarse aggregate, repair and fill the microcracks on the surface of the aggregate caused by crushing, improve the pore structure inside the aggregate, and improve the compactness of the aggregate to reduce the void ratio.

[0020] 2. The present invention effectively removes the attachments on the surface of the aggregate by immersing the recycled coarse aggregate in a diluted acid solution, making the aggregate cleaner. The surfactant can form a protective film on the surface of the recycled coarse aggregate to improve its wettability and adhesion, thereby improving the compatibility and affinity between the aggregate and the cement paste, solving the problem of poor adhesion between the new and old materials and between the two materials before and after, making up for the defects of the base layer, ensuring the normal and good construction of subsequent materials, making the aggregate and the cement paste better combined, and further reducing the porosity of the concrete insulation wallboard.

[0021] 3. The present invention reduces the thermal conductivity of the thermal insulation wall panels by introducing polystyrene boards inside the concrete thermal insulation wall panels and polyurethane foam boards on the surface of the wall panels, effectively reduces heat transfer and thus improves the thermal insulation effect of the wall, effectively buffers external impact forces, protects the wall structure, avoids problems such as mold and falling off after the wall surface is affected by moisture, and ensures the good performance of the thermal insulation wall panels in different environments. The combination of polystyrene boards and polyurethane foam boards in concrete thermal insulation wall panels improves the waterproof, moisture-proof and impact-resistant properties of the wall panels while ensuring the thermal insulation performance, thereby extending the service life of the concrete thermal insulation wall panels.

[0022] 4. The present invention uses vacuum pressurization during the preparation of concrete insulation wall panels to effectively remove bubbles and excess moisture in the concrete, making the concrete more compact and improving the insulation performance and compressive strength of the wall panels. Vacuum pressurization can better integrate recycled materials such as construction waste with concrete, reduce cracks and improve impermeability. Vacuum pressurization accelerates the hydration reaction of cement so that the concrete reaches a predetermined strength earlier, shortening the preparation cycle of the concrete insulation wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the concrete thermal insulation wall panel of the present invention;

[0024] Figure 2 The present invention is a process flow chart for preparing the concrete insulation wallboard based on construction waste.

[0025] In the figure: 1. Concrete wall panel substrate; 2. Interface agent; 3. Polyurethane foam glue; 4. Polyurethane foam board. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection or a movable connection, or a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] Embodiment 1, an embodiment provided by the present invention: a concrete insulation wall panel based on construction waste, comprising a concrete wall panel substrate 1, wherein the concrete wall panel substrate 1 concrete slurry is prepared by mixing 30 to 50 parts of recycled coarse aggregate, 15 to 20 parts of light concrete waste particles, 10 to 15 parts of cement, 8 to 12 parts of slag powder, 8 to 12 parts of fly ash, 8 to 10 parts of vermiculite, 8 to 10 parts of perlite, 2 to 3 parts of thickener, 1.5 to 2 parts of water reducer and water in a high-speed mixer.

[0030] The method for preparing the concrete thermal insulation wallboard based on construction waste comprises the following steps: 1. infiltrating the coarse aggregate; 2. preparing the concrete slurry; 3. pouring; 4. curing treatment;

[0031] The steps of coarse aggregate infiltration are as follows: soak the recycled coarse aggregate in water, remove the dirt, silt and organic impurities on the surface by stirring and washing, improve the smoothness of the particle surface and reduce the dust content on the surface;

[0032] The steps for preparing concrete slurry are as follows: put the raw materials such as the wetted coarse aggregate, light concrete waste particles, cement, slag powder, fly ash, vermiculite, perlite, thickener, water and the like into a mixer in proportion and mix them evenly, mix and stir for 10 minutes at 45°C and a speed of 300 r / min to form concrete slurry;

[0033] The pouring steps are as follows: 1. Mold pouring: After applying a release agent on the mold surface, pour the mixed concrete slurry evenly to the bottom of the mold and vibrate to make the concrete dense, lay a steel mesh frame on the concrete, pour another layer of concrete on the steel mesh frame, compact and flatten the surface of the exterior wall panel to ensure the surface is flat; 2. Wall inspection: Perform a quality inspection on the size, strength and thermal insulation performance of the manufactured concrete wall panel base plate 1;

[0034] The curing steps are as follows: 1. Normal pressure steam curing: 24 hours after the wall panel is cast, the concrete wall panel substrate is placed in the steam curing box and steam cured at 50°C for 6 hours; Step 2, temperature and pressure curing: During the curing time, gradually increase the temperature and pressure of steam curing to promote the molding and hardening of cement. After the steam curing is completed, the wall panel is taken out for cleaning and inspection and examination; 3. Natural curing: The concrete wall panel substrate after normal pressure steam curing is subjected to water sprinkling or film cloth curing.

[0035] Embodiment 2, an embodiment provided by the present invention: a concrete insulation wall panel based on construction waste, comprising a concrete wall panel substrate 1, wherein the concrete wall panel substrate 1 concrete slurry is prepared by mixing 30 to 50 parts of recycled coarse aggregate, 15 to 20 parts of light concrete waste particles, 10 to 15 parts of cement, 8 to 12 parts of slag powder, 8 to 12 parts of fly ash, 8 to 10 parts of vermiculite, 8 to 10 parts of perlite, 2 to 3 parts of thickener, 1.5 to 2 parts of water reducer and water in a high-speed mixer.

[0036] The method for preparing the concrete thermal insulation wallboard based on construction waste comprises the following steps: 1. infiltrating the coarse aggregate; 2. preparing the concrete slurry; 3. pouring; 4. curing treatment;

[0037] The steps of coarse aggregate impregnation are as follows: soak the recycled coarse aggregate in an acid solution, remove the dirt, silt and organic impurities on the surface by stirring and washing, improve the smoothness of the particle surface and reduce the dust content on the surface;

[0038] The steps for preparing concrete slurry are as follows: put the raw materials such as the wetted coarse aggregate, light concrete waste particles, cement, slag powder, fly ash, vermiculite, perlite, thickener, water and the like into a mixer in proportion and mix them evenly, mix and stir for 10 minutes at 45°C and a speed of 300 r / min to form concrete slurry;

[0039] The pouring steps are as follows: 1. Mold pouring: After applying a release agent on the mold surface, pour the mixed concrete slurry evenly to the bottom of the mold and vibrate to make the concrete dense, lay a steel mesh frame on the concrete, pour another layer of concrete on the steel mesh frame, compact and flatten the surface of the exterior wall panel to ensure the surface is flat; 2. Wall inspection: Perform a quality inspection on the size, strength and thermal insulation performance of the manufactured concrete wall panel base plate 1;

[0040] The curing steps are as follows: 1. Normal pressure steam curing: 24 hours after the wall panel is cast, the concrete wall panel substrate is placed in the steam curing box and steam cured at 50°C for 6 hours; Step 2, temperature and pressure curing: During the curing time, gradually increase the temperature and pressure of steam curing to promote the molding and hardening of cement. After the steam curing is completed, the wall panel is taken out for cleaning and inspection and examination; 3. Natural curing: The concrete wall panel substrate after normal pressure steam curing is subjected to water sprinkling or film cloth curing.

[0041] Example 3. An embodiment provided by the present invention: a concrete insulation wall panel based on construction waste, including a concrete wall panel substrate 1, wherein the concrete wall panel substrate 1 concrete slurry is mixed by 30 to 50 parts of recycled coarse aggregate, 15 to 20 parts of light concrete waste particles, 10 to 15 parts of cement, 8 to 12 parts of slag powder, 8 to 12 parts of fly ash, 8 to 10 parts of vermiculite, 8 to 10 parts of perlite, 2 to 3 parts of thickener, 1.5 to 2 parts of water reducer and water in a high-speed mixer.

[0042] The method for preparing the concrete thermal insulation wallboard based on construction waste comprises the following steps: 1. infiltrating the coarse aggregate; 2. preparing the concrete slurry; 3. pouring; 4. curing treatment;

[0043] The steps of coarse aggregate infiltration are as follows: 1. Coarse aggregate pretreatment: soak the recycled coarse aggregate in an acidic solution, remove the soil, silt, and organic impurities on the surface by stirring, washing, etc., improve the smoothness of the particle surface and reduce the surface dust content; 2. Chemical slurry ultrasonic treatment: completely immerse the pretreated recycled coarse aggregate in an organosilicon waterproofing agent, and the ultrasonic wave generates high-frequency vibration and cavitation effect, so that the organosilicon waterproofing agent is evenly dispersed and reacts with the components in the aggregate to produce products to fill the pores of the recycled coarse aggregate. The ultrasonic frequency of the ultrasonic equipment is controlled at 40kHz, and the ultrasonic dispersion time is 20min. The recycled coarse aggregate after pore filling is dried;

[0044] The steps for preparing concrete slurry are as follows: put the raw materials such as the wetted coarse aggregate, light concrete waste particles, cement, slag powder, fly ash, vermiculite, perlite, thickener, water and the like into a mixer in proportion and mix them evenly, mix and stir for 10 minutes at 45°C and a speed of 300 r / min to form concrete slurry;

[0045] The pouring steps are as follows: 1. Mold pouring: After applying a release agent on the mold surface, pour the stirred concrete slurry evenly to the bottom of the mold and vibrate to make the concrete dense, place the pre-cut polystyrene board flat on the concrete surface, lay a steel mesh frame above the insulation core material to ensure a firm connection between the polystyrene board and the outer concrete, pour another layer of concrete on the steel mesh frame to ensure that the concrete is firmly connected to the polystyrene board and the steel mesh frame, and compact and flatten the surface of the outer wall panel to ensure that the surface is flat; 2. Wall inspection: Perform a quality inspection on the size, strength and thermal insulation performance of the manufactured concrete wall panel base plate 1;

[0046] The curing steps are as follows: 1. Normal pressure steam curing: 24 hours after the wall panel is cast, the concrete wall panel substrate is placed in the steam curing box and steam cured at 50°C for 6 hours; Step 2, temperature and pressure curing: During the curing time, gradually increase the temperature and pressure of steam curing to promote the molding and hardening of cement. After the steam curing is completed, the wall panel is taken out for cleaning and inspection and examination; 3. Natural curing: The concrete wall panel substrate after normal pressure steam curing is subjected to water sprinkling or film cloth curing.

[0047] Embodiment 4, an embodiment provided by the present invention: a concrete insulation wall panel based on construction waste, comprising a concrete wall panel substrate 1, a polyurethane foam glue 3 and a polyurethane foam board 4, an interface agent 2 is arranged on the outer side of the concrete wall panel substrate 1, a polyurethane foam glue 3 is arranged on the outer side of the interface agent 2, the polyurethane foam board 4 is arranged on the outer side of the concrete wall panel substrate 1 through the polyurethane foam glue 3, and the concrete wall panel substrate 1 concrete slurry is mixed by 30 to 50 parts of recycled coarse aggregate, 15 to 20 parts of light concrete waste particles, 10 to 15 parts of cement, 8 to 12 parts of slag powder, 8 to 12 parts of fly ash, 8 to 10 parts of vermiculite, 8 to 10 parts of perlite, 2 to 3 parts of thickener, 1.5 to 2 parts of water reducer and water in a high-speed mixer.

[0048] The preparation method of the concrete thermal insulation wallboard based on construction waste comprises the following steps: 1. coarse aggregate infiltration; 2. concrete slurry preparation; 3. pouring; 4. curing treatment; 5. thermal insulation performance post-treatment;

[0049] The steps of coarse aggregate infiltration are as follows: 1. Coarse aggregate pretreatment: soak the recycled coarse aggregate in an acidic solution, remove the soil, silt, and organic impurities on the surface by stirring, washing, etc., improve the smoothness of the particle surface and reduce the surface dust content; 2. Chemical slurry ultrasonic treatment: completely immerse the pretreated recycled coarse aggregate in an organosilicon waterproofing agent, and the ultrasonic wave produces high-frequency vibration and cavitation effect, so that the organosilicon waterproofing agent is evenly dispersed and reacts with the components in the aggregate to produce products to fill the pores of the recycled coarse aggregate. The ultrasonic frequency of the ultrasonic equipment is controlled at 40kHz, and the ultrasonic dispersion time is 20min. The recycled coarse aggregate after pore filling is dried; 3. Formation of protective film: completely immerse the recycled coarse aggregate after pore filling in a surfactant, and the immersion time is 20min. The surfactant forms a protective film on the surface of the recycled coarse aggregate to improve its wettability and adhesion;

[0050] The steps for preparing concrete slurry are as follows: put the raw materials such as the wetted coarse aggregate, light concrete waste particles, cement, slag powder, fly ash, vermiculite, perlite, thickener, water and the like into a mixer in proportion and mix them evenly, mix and stir for 10 minutes at 45°C and a speed of 300 r / min to form concrete slurry;

[0051] The pouring steps are as follows: 1. Mold pouring: After applying a release agent on the mold surface, pour the stirred concrete slurry evenly to the bottom of the mold and vibrate to make the concrete dense, place the pre-cut polystyrene board flat on the concrete surface, lay a steel mesh frame above the insulation core material to ensure a firm connection between the polystyrene board and the outer concrete, pour another layer of concrete on the steel mesh frame to ensure that the concrete is firmly connected to the polystyrene board and the steel mesh frame, and compact and flatten the surface of the outer wall panel to ensure that the surface is flat; 2. Wall inspection: Perform a quality inspection on the size, strength and thermal insulation performance of the manufactured concrete wall panel base plate 1;

[0052] The curing steps are as follows: 1. Normal pressure steam curing: 24 hours after the wall panel is poured, the concrete wall panel substrate is placed in a steam curing box and steam cured at 50°C for 6 hours; Step 2. Temperature and pressure curing: During the curing time, the temperature and pressure of steam curing are gradually increased to promote the formation and hardening of cement. After the steam curing is completed, the wall panel is taken out for cleaning and inspection and examination; 3. Natural curing: The concrete wall panel substrate after normal pressure steam curing is subjected to watering curing or film cloth curing;

[0053] The post-processing steps for thermal insulation performance are as follows: 1. Base wall treatment: remove oil, dust and debris from the wall to ensure that the flatness of the wall meets the requirements. If there are too large concave and convex parts on the wall, cement mortar should be used for leveling; 2. Pasting pretreatment: cut out the polyurethane foam board 4 that adapts to the size and shape of the wall, and apply a layer of special interface agent 2 on the wall to improve the bonding force between the polyurethane foam board and the wall; 3. Adhesive application: apply polyurethane foam glue 3 around one side panel of the polyurethane foam board 4, the polyurethane foam glue 3 is applied with a width of 5cm and a thickness of 1cm, and 8 adhesive joints are scraped on the same side, the diameter of the adhesive joint is 10cm and the thickness is 10mm, the distance between the adhesive joints is controlled at 200mm and evenly arranged, and the polyurethane foam board 4 coated with adhesive is gently pressed on the wall of the concrete wallboard substrate 1 to ensure that it is completely fitted with the wall, and use tools to squeeze evenly to make the bonding mortar in close contact with the wall; 4. Overall inspection: After the pasting is completed, the pasting flatness, verticality and sealing of the polyurethane foam board 4 are checked.

[0054] Example 5. An embodiment provided by the present invention: a concrete insulation wall panel based on construction waste, comprising a concrete wall panel substrate 1, a polyurethane foam glue 3 and a polyurethane foam board 4, an interface agent 2 is arranged on the outer side of the concrete wall panel substrate 1, a polyurethane foam glue 3 is arranged on the outer side of the interface agent 2, the polyurethane foam board 4 is arranged on the outer side of the concrete wall panel substrate 1 through the polyurethane foam glue 3, and the concrete wall panel substrate 1 concrete slurry is mixed by 30 to 50 parts of recycled coarse aggregate, 15 to 20 parts of light concrete waste particles, 10 to 15 parts of cement, 8 to 12 parts of slag powder, 8 to 12 parts of fly ash, 8 to 10 parts of vermiculite, 8 to 10 parts of perlite, 2 to 3 parts of thickener, 1.5 to 2 parts of water reducer and water in a high-speed mixer.

[0055] The preparation method of the concrete thermal insulation wallboard based on construction waste comprises the following steps: 1. coarse aggregate infiltration; 2. concrete slurry preparation; 3. pouring and pressurization; 4. curing treatment; 5. thermal insulation performance post-treatment;

[0056] The steps of coarse aggregate infiltration are as follows: 1. Coarse aggregate pretreatment: soak the recycled coarse aggregate in an acidic solution, remove the soil, silt, and organic impurities on the surface by stirring, washing, etc., improve the smoothness of the particle surface and reduce the surface dust content; 2. Chemical slurry ultrasonic treatment: completely immerse the pretreated recycled coarse aggregate in an organosilicon waterproofing agent, and the ultrasonic wave produces high-frequency vibration and cavitation effect, so that the organosilicon waterproofing agent is evenly dispersed and reacts with the components in the aggregate to produce products to fill the pores of the recycled coarse aggregate. The ultrasonic frequency of the ultrasonic equipment is controlled at 40kHz, and the ultrasonic dispersion time is 20min. The recycled coarse aggregate after pore filling is dried; 3. Formation of protective film: completely immerse the recycled coarse aggregate after pore filling in a surfactant, and the immersion time is 20min. The surfactant forms a protective film on the surface of the recycled coarse aggregate to improve its wettability and adhesion;

[0057] The steps for preparing concrete slurry are as follows: put the raw materials such as the wetted coarse aggregate, light concrete waste particles, cement, slag powder, fly ash, vermiculite, perlite, thickener, water and the like into a mixer in proportion and mix them evenly, mix and stir for 10 minutes at 45°C and a speed of 300 r / min to form concrete slurry;

[0058] The pouring and pressurizing steps are as follows: 1. Mold pouring: After applying a release agent to the mold surface, pour the mixed concrete slurry evenly to the bottom of the mold and vibrate to make the concrete dense. Place the pre-cut polystyrene board flat on the concrete surface, lay a steel mesh frame above the insulation core material to ensure a firm connection between the polystyrene board and the outer layer of concrete, pour another layer of concrete on the steel mesh frame to ensure that the concrete is firmly connected to the polystyrene board and the steel mesh frame, compact and flatten the surface of the exterior wall panel to ensure a smooth surface; 2. Vacuum pressurization: Use a hydraulic pump to spray the acrylic resin evenly with a spray gun On the concrete surface, a vacuum bag is placed on the concrete surface sprayed with the polymer resin and sealed, the vacuum bag is connected to a vacuum pump, the vacuum pump is started to extract the air inside the concrete and to infiltrate the acrylic resin into the concrete, the vacuum state is maintained for 3 minutes, the acrylic resin is fully infiltrated into the concrete, and the excess moisture and air in the concrete are also discharged, the vacuum pump is turned off and the vacuum bag is removed, and the acrylic resin is naturally cured to obtain a concrete wall panel substrate 1; 3. Wall inspection: the size, strength and thermal insulation performance of the manufactured concrete wall panel substrate 1 are inspected;

[0059] The curing steps are as follows: 1. Normal pressure steam curing: 24 hours after the wall panel is poured, the concrete wall panel substrate is placed in a steam curing box and steam cured at 50°C for 6 hours; Step 2. Temperature and pressure curing: During the curing time, the temperature and pressure of steam curing are gradually increased to promote the formation and hardening of cement. After the steam curing is completed, the wall panel is taken out for cleaning and inspection and examination; 3. Natural curing: The concrete wall panel substrate after normal pressure steam curing is subjected to watering curing or film cloth curing;

[0060] The post-processing steps for thermal insulation performance are as follows: 1. Base wall treatment: remove oil, dust and debris from the wall to ensure that the flatness of the wall meets the requirements. If there are too large concave and convex parts on the wall, cement mortar should be used for leveling; 2. Pasting pretreatment: cut out the polyurethane foam board 4 that adapts to the size and shape of the wall, and apply a layer of special interface agent 2 on the wall to improve the bonding force between the polyurethane foam board and the wall; 3. Adhesive application: apply polyurethane foam glue 3 around one side panel of the polyurethane foam board 4, the polyurethane foam glue 3 is applied with a width of 5cm and a thickness of 1cm, and 8 adhesive joints are scraped on the same side, the diameter of the adhesive joint is 10cm and the thickness is 10mm, the distance between the adhesive joints is controlled at 200mm and evenly arranged, and the polyurethane foam board 4 coated with adhesive is gently pressed on the wall of the concrete wallboard substrate 1 to ensure that it is completely fitted with the wall, and use tools to squeeze evenly to make the bonding mortar in close contact with the wall; 4. Overall inspection: After the pasting is completed, the pasting flatness, verticality and sealing of the polyurethane foam board 4 are checked.

[0061] Performance Test:

[0062] 1. Compactness: Use a compactness detector to transmit vibration signals to the surface of the concrete wall and receive the reflected signals to evaluate the compactness of the concrete. The compactness calculation formula is: compactness (%) = (concrete volume - void volume) / concrete volume × 100%;

[0063] 2. Thermal conductivity: Use a thermal conductivity tester to automatically measure and calculate the thermal conductivity of the material. During the test, it is necessary to ensure that the state of the sample is adjusted to a constant quality, that is, the sample needs to be balanced in temperature and humidity under the specified environmental conditions before the test. The test instrument should be preheated before the test, and the sample surface should be kept dry during the test to avoid affecting the test results;

[0064] 3. Adhesion: Ultrasonic damage measurement technology is used to evaluate the degree of concrete damage and indirectly reflect the adhesion between construction waste materials and cement paste;

[0065] 4. Compressive strength: Use the test block method, that is, make a concrete test block with the same material as the insulation wall panel, and maintain it according to the specified requirements. After reaching the specified time, use a concrete pressure testing machine to perform a compression test on it to obtain the compressive strength value of the test block.

[0066] The test data of each embodiment under the same test conditions are shown in Table 1

[0067] Example 1 Example 2 Example 3 Example 4 Example 5 Modification method none physics Physics, Chemistry Physics, Chemistry Physics, Chemistry Surfactant Wetting no no no yes yes Internal insulation material none none Polystyrene board Polystyrene board Polystyrene board Surface insulation material none none none Polyurethane foam board Polyurethane foam board Vacuum pressurization no no no no yes Density% 83 85 89 90 92 Adhesion force MPa 0.8 0.8 0.8 1.2 1.2 Thermal conductivity W / (m·K) 0.42 0.40 0.32 0.25 0.23 Compressive strength MPa 19 20 20 22 25

[0068] Table 1

[0069] It can be seen from the experimental data in Table 1 that the concrete insulation wall panels prepared with recycled coarse aggregate after physical modification, chemical strengthening and surfactant infiltration treatment have lower porosity, better density and compressive strength, and better combination of aggregate and cement paste. The thermal insulation wall panels prepared by introducing polystyrene boards inside and polyurethane foam boards on the wall panel surface have lower thermal conductivity, which effectively reduces heat transfer and improves the insulation effect of the wall, improves the waterproof, moisture-proof and impact resistance of the wall panels, and extends the service life of the concrete insulation wall panels. Vacuum pressurization is used in the preparation process of concrete insulation wall panels to effectively remove bubbles and excess moisture in the concrete, making the concrete more compact and improving the thermal insulation performance and compressive strength of the wall panels.

[0070] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A method for preparing a concrete insulation wallboard based on construction waste, characterized in that: The method comprises the following steps:

1. coarse aggregate infiltration; 2. concrete slurry preparation; 3. pouring and pressurizing; 4. curing treatment; 5. thermal insulation performance post-treatment; The coarse aggregate infiltration steps are as follows: step (1) coarse aggregate pretreatment: soak the recycled coarse aggregate in an acid solution, remove the soil, silt and organic impurities on the surface by stirring, washing and other methods, improve the smoothness of the particle surface and reduce the surface dust content; step (2) chemical slurry ultrasonic treatment: completely soak the pretreated recycled coarse aggregate in an organosilicon waterproofing agent, the ultrasonic wave generates high-frequency vibration and cavitation effect, so that the organosilicon waterproofing agent is evenly dispersed and reacts with the components in the aggregate to generate products to fill the pores of the recycled coarse aggregate, the ultrasonic frequency of the ultrasonic equipment is controlled at 40 to 55 kHz, the ultrasonic dispersion time is 20 to 35 minutes, and the recycled coarse aggregate with pores filled is dried; step (3) protective film formation: completely soak the recycled coarse aggregate with pores filled in a surfactant, the soaking time is 20 to 30 minutes, the surfactant forms a protective film on the surface of the recycled coarse aggregate to improve its wettability and adhesion.

2. The method for preparing a concrete insulation wallboard based on construction waste according to claim 1, characterized in that: The concrete slurry preparation steps are as follows: put the raw materials such as the soaked coarse aggregate, lightweight concrete waste particles, cement, slag powder, fly ash, vermiculite, perlite, thickener, water and the like into a mixer according to proportion and mix them evenly, mix and stir for 10 to 15 minutes at 45° C. and a speed of 300 r / min to form concrete slurry.

3. The method for preparing a concrete insulation wallboard based on construction waste according to claim 1, characterized in that: The pouring and pressurizing steps are as follows: Step (1) mold pouring: after applying a release agent to the mold surface, the stirred concrete slurry is evenly poured to the bottom of the mold and vibrated to make the concrete dense, the pre-cut polystyrene board is evenly placed on the concrete surface, a steel mesh is laid on the insulation core material to ensure that the connection between the polystyrene board and the outer layer of concrete is firm, another layer of concrete is poured on the steel mesh to ensure that the concrete is firmly connected to the polystyrene board and the steel mesh, and the surface of the exterior wall panel is compacted and flattened to ensure that the surface is flat; Step (2) vacuum pressurization: using a hydraulic pump to spray acrylic resin evenly on the concrete with a spray gun A vacuum bag is placed on the concrete surface on which the polymer resin has been sprayed and sealed, the vacuum bag is connected to a vacuum pump, the vacuum pump is started to extract the air inside the concrete and to allow the acrylic resin to penetrate into the concrete, the vacuum state is maintained for 3 to 5 minutes, the acrylic resin is fully penetrated into the concrete, and the excess moisture and air in the concrete are also discharged, the vacuum pump is turned off and the vacuum bag is removed, and the acrylic resin is allowed to solidify naturally to obtain a concrete wall panel substrate (1); step (3) wall inspection: the size, strength and thermal insulation performance of the manufactured concrete wall panel substrate (1) are inspected.

4. The method for preparing a concrete insulation wallboard based on construction waste according to claim 1, characterized in that: The curing treatment steps are as follows: step (1) normal pressure steam curing: 24 hours after the wall panel is cast, the concrete wall panel substrate is placed in a steam curing box and steam cured at 50°C to 65°C for 6 to 8 hours; step (2) temperature and pressure curing: during the curing time, the steam curing temperature and pressure are gradually increased to promote the molding and hardening of the cement. After the steam curing is completed, the wall panel is taken out for cleaning and inspection and examination; step (3) natural curing: the concrete wall panel substrate after normal pressure steam curing is subjected to water sprinkling curing or film cloth curing.

5. The method for preparing a concrete insulation wallboard based on construction waste according to claim 1, characterized in that: The thermal insulation performance post-processing steps are as follows: step (1) base wall treatment: remove oil stains, dust and debris on the wall to ensure that the flatness of the wall meets the requirements. If there are too large concave and convex parts on the wall, cement mortar should be used for leveling; step (2) pasting pretreatment: cut out the polyurethane foam board (4) that adapts to the size and shape of the wall, and apply a layer of special interface agent (2) on the wall to improve the bonding force between the polyurethane foam board and the wall; step (3) adhesive application: apply polyurethane foam glue (3) around one side panel of the polyurethane foam board (4), and scrape 8 adhesive joints on the same side. The spacing between the adhesive joints is controlled to be 200 mm and evenly arranged. The polyurethane foam board (4) coated with adhesive is gently pressed on the wall of the concrete wallboard substrate (1) to ensure that it is completely in contact with the wall, and use a tool to evenly squeeze the adhesive mortar to make close contact with the wall; step (4) overall inspection: after the pasting is completed, the pasting flatness, verticality and sealing of the polyurethane foam board (4) are inspected.

6. The method for preparing a concrete insulation wallboard based on construction waste according to claim 5, characterized in that: The polyurethane foam glue (3) has a coating width of 4.5 to 5 cm and a thickness of 0.8 to 1 cm. The glue joint has a diameter of 10 cm and a thickness of 10 mm.

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