A dual-phase composite protective plate based on construction solid waste and a preparation method thereof

Abstract

The application discloses a kind of building solid waste-based two-phase composite protective plate, the two-way composite protective plate is in the form of plate-shaped reinforced concrete outside, hollow structure is used for filling paraffin and impact-resistant fluid gel inside, the impact-resistant fluid gel is made of the following mass percentage of raw materials: thickening thixotropic agent 1~2%;5~7% of fumed nanosilica;15~25% of water;Building waste powder remainder.And provide a kind of preparation method of building solid waste-based two-phase composite protective plate.The application is prepared by waste and suitable material compound, the protective plate of the application has excellent performance and sustainability;It improves the impact resistance of concrete member, enhances the stability and safety of concrete member when facing impact and vibration.

Description

Technical Field

[0001] This invention belongs to the field of building engineering technology and relates to a dual-phase composite protective board based on building solid waste and its preparation method. Background Technology

[0002] In the fields of architecture and civil engineering, reinforced concrete is a commonly used structural material. However, under impact loads, traditional reinforced concrete structures often experience cracking and collapse. In the current field of concrete impact resistance, modern protective engineering generally employs methods such as high-strength concrete, large-scale consumption of cement and steel reinforcement to improve the impact resistance of components. High-strength concrete increases compressive strength by increasing cement content and reducing the water-cement ratio, but this increases resource consumption and construction difficulty. The use of steel reinforcement can significantly improve the ductility of concrete components, but it also increases energy consumption and environmental impact. In the continuous pursuit of impact resistance, fiber materials have become a widely accepted solution. Adding fiber materials such as steel fibers and basalt fibers can significantly enhance the impact resistance of concrete and reduce the risk of cracking and fracture, as illustrated by patent CN208501948U. However, adding fiber materials also brings some disadvantages, such as high cost and complex manufacturing processes.

[0003] Non-Newtonian fluids are a class of fluids whose viscosity and flow behavior under stress do not conform to Newtonian fluid dynamics theory. Unlike Newtonian fluids, the viscosity of non-Newtonian fluids is not linearly related to the shear rate (deformation rate). The viscosity of non-Newtonian fluids can be adjusted according to the applied force or shear rate. When subjected to impact or high-speed shear, non-Newtonian fluids exhibit high viscosity, thereby absorbing energy and slowing the propagation of impact force. Adding non-Newtonian fluids to concrete members can improve their impact resistance. The high viscosity and plastic deformation characteristics of non-Newtonian fluids can absorb and disperse impact energy and slow the transmission of impact force, thereby reducing the degree of impact damage to concrete members.

[0004] There is currently an invention that uses non-Newtonian fluids as the impact-resistant protective layer for guardrails (publication number CN111996954A), but it has not yet been used in the field of construction engineering. Although the guardrail of this invention utilizes non-Newtonian fluids as the impact-resistant protective layer, its complex structure, high cost, and potentially increased maintenance and repair difficulties limit its promotion and adoption. Summary of the Invention

[0005] To address the challenges of reusing construction waste and improving the impact resistance of concrete components, this invention proposes a biphase composite protective panel based on construction solid waste and its preparation method. By combining waste with appropriate materials, the protective panel of this invention exhibits excellent performance and sustainability.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] A biphasic composite protective panel based on construction solid waste, wherein the outer surface of the biphasic composite protective panel is in the form of plate-shaped reinforced concrete, and the inner surface is a hollow structure for injecting paraffin wax and an impact-resistant fluidized colloid, wherein the impact-resistant fluidized colloid is made from the following raw materials in the indicated mass percentages:

[0008]

[0009] Furthermore, the main body of the bidirectional composite protective plate is a concrete cavity plate, the thickness of the internal cavity is about 1 / 3 to 2 / 3 of the thickness of the concrete plate, and the distance between the cavity and the outer edge is not less than 20mm.

[0010] Preferably, the construction waste powder is a mixture containing one or at least two of the following: waste brick powder, incineration fly ash, waste stone powder, and sludge, with a particle size distribution of 1 micrometer to 10 micrometers.

[0011] The impact-resistant fluid colloid is a non-Newtonian fluid, and its flow characteristic index n ranges from 0.1 to 0.4.

[0012] The fumed silica nanoparticles have a particle size of less than 50 nanometers and a specific surface area of ​​more than 150 m². 2 / g and the silica content is higher than 99%.

[0013] The thickening thixotropic agent is one or a mixture of at least two of water-soluble hydroxyethyl cellulose, polyvinyl alcohol, or polyacrylate.

[0014] A method for preparing a dual-phase composite protective panel based on construction solid waste includes the following steps:

[0015] (1) First, use recycled aggregate to cast a hollow concrete cavity slab with solid paraffin wax to fill the hollow part during casting; the upper and lower parts of the recycled aggregate concrete slab are equipped with distributed steel bars, and the side is equipped with structural steel bars; a grouting hole and an air vent are reserved on one side of the concrete cavity slab for internal injection of impact-resistant fluid colloid.

[0016] (2) According to the raw material ratio of the impact-resistant fluid colloid, the solid waste powder and fumed nano silica are mixed and then dry-mixed in a mixer for 2 to 4 minutes;

[0017] (3) According to the raw material ratio of the impact-resistant fluid colloid, the thickening thixotropic agent is dissolved in water, and then the mixed solution is slowly poured into the mixer and fully mixed with the solid powder. The mixture is slowly stirred for 2 to 4 minutes to obtain the fluid colloid.

[0018] (4) Heat the reinforced concrete slab with paraffin inside to 70-80 degrees Celsius, then pour out the melted paraffin from the vent hole and let the reinforced concrete slab stand to cool down to room temperature.

[0019] (5) Slowly inject the fluid colloid obtained in step 3 into the grouting hole until the colloid appears in the vent hole to complete the grouting. Then use a high-strength rubber plug to block the grouting hole and the vent hole.

[0020] This invention reuses construction solid waste by casting it into concrete slabs made from recycled aggregates as an impact-resistant colloid, bringing multiple benefits. First, by effectively processing construction solid waste, it reduces the demand for natural resources, lowers dependence on raw materials, achieves resource recycling, and further promotes the practice of sustainable development in the construction industry. Second, using waste materials as an impact-resistant colloid significantly improves the seismic and impact resistance of concrete slabs, effectively enhancing the building's ability to resist natural disasters and terrorist attacks, thereby protecting life and property. Furthermore, compared to traditional concrete, using the impact-resistant colloid of this invention significantly reduces the self-weight of the building structure and lowers the structural load. This is particularly important for large buildings, high-rise buildings, and other structures that need to withstand enormous pressure. Reducing the structural load lowers the stress level of the structure, improving its stability and durability. The fluid properties of the colloid of this invention allow for easier injection into components or structures, filling voids and pores. This makes its use during construction more flexible and convenient, and allows for a wider range of applications.

[0021] The beneficial effects of this invention are mainly reflected in:

[0022] (1) This invention utilizes construction waste powder as a raw material for impact-resistant colloids, thereby realizing the reuse of construction waste, reducing resource waste, and lowering engineering costs.

[0023] (2) Compared to traditional cement alternatives, the present invention provides a higher proportion of waste to replace cement, expands the types of waste to be selected, and provides more material options and performance adjustment possibilities.

[0024] (3) By adding construction waste powder to make an impact-resistant fluid colloid and filling it into reinforced concrete slabs, the impact resistance of concrete components is improved, and the stability and safety of concrete components when facing impact and vibration are enhanced.

[0025] (4) The impact-resistant fluidized colloid of the present invention can reduce the self-weight of the building structure, reduce the load on the structure, and improve the stability and durability of the structure.

[0026] (5) The impact-resistant fluidized colloid of the present invention has fluid properties, which facilitates its use in the construction process. It can be more easily injected into components or structures to fill voids and pores, and can be conveniently applied to different types of projects, covering a wider range of applications.

[0027] (6) In this invention, when the impact-resistant fluidized colloid is injected into the concrete protective panel, a layer of paraffin wax is attached to the internal cavity as an isolation membrane. Within the normal service temperature range, paraffin wax has excellent sealing properties. This paraffin wax isolation membrane effectively prevents the concrete from absorbing moisture from the impact-resistant fluidized colloid, ensuring the good function of the impact-resistant fluidized colloid. Simultaneously, it also effectively prevents moisture from the impact-resistant fluidized colloid from seeping into the concrete structure, ensuring the durability of the concrete structure. This invention utilizes paraffin wax as an isolation membrane between the concrete cavity panel and the impact-resistant fluidized colloid. This innovative design provides effective protection for the durability and impact resistance of the concrete protective panel and has significant application value. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a two-phase composite protective panel based on construction solid waste.

[0029] Figure 2 This is a schematic diagram of a two-phase composite protective panel structure based on construction solid waste.

[0030] Among them, 1 is a reinforced concrete hollow slab; 2 is transversely distributed reinforcing bars; 3 is the internal cavity of the concrete slab; 4 is longitudinally distributed reinforcing bars; 5 is a pore; 6 is an impact-resistant fluidized colloid; and 7 is a grouting port. Detailed Implementation

[0031] The present invention will now be further described with reference to the accompanying drawings.

[0032] Reference Figure 1 and Figure 2 A biphasic composite protective board based on construction solid waste, wherein the outer surface of the biphasic composite protective board is in the form of plate-shaped reinforced concrete, and the inner surface is a hollow structure for injecting paraffin wax and an impact-resistant fluidized colloid, wherein the impact-resistant fluidized colloid is made from the following raw materials in the indicated mass percentages:

[0033]

[0034] Furthermore, the main body of the bidirectional composite protective plate is a reinforced concrete hollow plate 1, the thickness of the internal cavity is about 1 / 3 to 2 / 3 of the thickness of the concrete plate, and the distance between the cavity and the outer edge is not less than 20mm.

[0035] Preferably, the construction waste powder is a mixture containing one or at least two of the following: waste brick powder, incineration fly ash, waste stone powder, and sludge, with a particle size distribution of 1 micrometer to 10 micrometers.

[0036] The impact-resistant fluid colloid is a non-Newtonian fluid, and its flow characteristic index n ranges from 0.1 to 0.4.

[0037] The fumed silica nanoparticles have a particle size of less than 50 nanometers and a specific surface area of ​​more than 150 m². 2 / g and the silica content is higher than 99%.

[0038] The thickening thixotropic agent is one or a mixture of at least two of water-soluble hydroxyethyl cellulose, polyvinyl alcohol, or polyacrylate.

[0039] A method for preparing a dual-phase composite protective panel based on construction solid waste includes the following steps:

[0040] (1) The reinforced concrete hollow slab 1 is poured by arranging transverse reinforcing bars 2 and longitudinal reinforcing bars 4 according to the design requirements and installing templates of the designed dimensions; then, concrete is prepared and poured, while solid paraffin wax is used to fill the hollow part, and grouting holes and venting holes are reserved on the side; next, a vibrator is used to fully vibrate to ensure the compactness of the concrete; finally, certain measures are taken to keep the concrete slab stable and standard curing is carried out; after 28 days of standard curing, the reinforced concrete hollow slab is heated to 75 degrees Celsius, and then the melted paraffin wax is poured out from the venting holes, and the reinforced concrete slab is left to cool down to room temperature. Thus, the concrete hollow slab 1 required by the present invention is obtained.

[0041] (2) Preparation of impact-resistant fluid colloid. Take the following raw materials by weight percentage: 1% thickening thixotropic agent; 6% fumed silica; 20% water; 73% construction waste powder. First, mix the dry solid waste powder with the fumed silica, and place both into a mixer. Start the mixer and dry-mix the solid waste powder and fumed silica, keeping the mixer running normally for 3 minutes to ensure thorough mixing. Then, add the thickening thixotropic agent to the water and stir thoroughly or until dissolved to form a thickened thixotropic solution. Slowly pour the prepared thickened thixotropic solution into the mixer and mix it with the solid waste powder and fumed silica. Ensure the solution is added at a moderate rate and poured evenly into the mixer. Start the mixer and stir slowly for 3 minutes to ensure thorough mixing of the above raw materials, forming a fluid colloid.

[0042] (3) Grouting. The fluidized colloid obtained in the above steps is injected into the internal cavity 3 of the concrete cavity plate through the pre-reserved grouting holes on the side of the concrete cavity plate. The grouting pressure is controlled at 1.0 MPa. Grouting is completed after the grout overflows from the pre-reserved air holes 5. After grouting, the grouting holes and air holes are plugged with high-strength rubber plugs. Thus, the biphase composite protective plate based on construction solid waste described in this invention is obtained.

[0043] The embodiments described in this specification are merely examples of implementations of the inventive concept and are for illustrative purposes only. The scope of protection of this invention should not be considered limited to the specific forms described in these embodiments; rather, it extends to equivalent technical means conceived by those skilled in the art based on the inventive concept.

Claims

1. A method for preparing a dual-phase composite armor plate based on construction solid waste, characterized in that, The double-phase composite protective plate is externally in the form of a plate-shaped reinforced concrete and internally in a hollow structure for pouring paraffin and an impact-resistant fluid colloidal substance, the impact-resistant fluid colloidal substance being made of raw materials in the following mass percentages: The method comprises the following steps: (1) first, a recycled aggregate cast-in-situ internal hollow concrete cavity plate is used, the hollow part being filled with solid paraffin during pouring; distributed steel bars are arranged on the upper and bottom parts of the recycled aggregate concrete plate, and structural steel bars are arranged on the side surface; a grouting hole and an exhaust hole are reserved on one side of the concrete cavity plate for pouring the impact-resistant fluid colloidal substance inside; (2) according to the raw material ratio of the impact-resistant fluid colloidal substance, building waste powder and fumed nano-silicon dioxide are mixed and then dry-mixed in a mixer for 2-4 minutes; (3) according to the raw material ratio of the impact-resistant fluid colloidal substance, a thickening thixotropic agent is melted in water, and then the mixed solution is slowly poured into the mixer to be fully mixed with the solid powder, and the mixture is slowly stirred for 2-4 minutes to obtain the fluid colloidal substance; (4) the reinforced concrete plate with paraffin inside is heated to 70-80 degrees Celsius, then the melted paraffin is poured out from the exhaust hole, and the reinforced concrete plate is left to cool to room temperature; (5) the fluid colloidal substance obtained in step (3) is slowly injected from the grouting hole until the colloidal substance appears in the exhaust hole, and then the grouting hole and the exhaust hole are plugged with high-strength rubber plugs.

2. A method of manufacturing a dual phase composite protective panel based on construction solid waste as claimed in claim 1, wherein, The main body of the double-phase composite protective plate is a reinforced concrete cavity plate, the internal cavity thickness is 1 / 3 to 2 / 3 of the thickness of the concrete plate, and the cavity distance from the outer edge is not less than 20 mm.

3. A method of manufacturing a dual phase composite sheet based on construction solid waste according to claim 1 or 2, characterized in that, The building waste powder is a mixture containing one or at least two of waste brick powder, incineration fly ash, waste stone powder and sludge, and the particle size distribution is 1-10 microns.

4. A method of manufacturing a dual phase composite sheet based on construction solid waste according to claim 1 or 2, characterized in that, The impact-resistant fluid colloidal substance belongs to a non-Newtonian fluid, and the flow state characteristic index n value ranges from 0.1 to 0.

4.

5. A method of manufacturing a dual phase composite sheet based on construction solid waste according to claim 1 or 2, wherein, The gas phase nanometer silicon dioxide has a particle size less than 50 nanometers, a specific surface area greater than 150 m 2 / g and a silicon dioxide content higher than 99%.

6. A method of manufacturing a dual phase composite sheet based on construction solid waste according to claim 1 or 2, wherein, The thickening thixotropic agent is a mixture of one or at least two of water-soluble hydroxyethyl cellulose, polyvinyl alcohol or polyacrylic acid salt.

Images