Long afterglow luminescent concrete and method for preparing the same
High-performance long-afterglow luminescent concrete was prepared by mixing long-afterglow luminescent materials prepared by high-temperature sintering with cementitious materials. This solved the problem of limited application of long-afterglow luminescent materials in concrete, and achieved a combination of high strength and good light performance, making it suitable for a variety of building applications.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TIANYUAN CONSTR GROUP
- Filing Date
- 2024-11-28
- Publication Date
- 2026-06-26
AI Technical Summary
In the existing technology, long afterglow luminescent materials have not been effectively incorporated into concrete, which limits their application in building materials and fails to simultaneously guarantee the mechanical and luminescent properties of concrete.
Long-afterglow luminescent materials are prepared by high-temperature sintering using metal oxides such as gallium oxide, chromium oxide, and zinc oxide. These materials are then mixed with cementitious materials, modified silica sol, glass microspheres, and other components to prepare high-performance long-afterglow luminescent concrete. The proportion of luminescent materials is controlled to ensure the strength and light transmittance of the concrete.
The prepared long-afterglow luminescent concrete has excellent excitation emission and afterglow properties, high strength, strong light transmittance, and good mechanical properties, making it suitable for emergency passage indication, low-light lighting, and architectural decoration.
Smart Images
Figure CN119528512B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of building materials technology, and relates to a long afterglow luminescent concrete and its preparation method. Background Technology
[0002] Long-afterglow luminescence refers to the phenomenon where, after a luminescent material is excited by an external light source, electrons in the conduction band transition to the valence band and recombine with holes in the valence band, producing photons with energy greater than the band gap width Eg. After excitation ceases, the excited electrons return to a lower energy level and release the absorbed energy as light, thus achieving the effect of energy storage and luminescence. The emission wavelengths of luminescent materials are located in the near-infrared band, exhibiting good penetration and long luminescence duration, making them promising candidates for development in the field of building materials.
[0003] In modern engineering, concrete is a widely used and consumed building material with broad application prospects in the construction of basic public infrastructure. As a commonly used load-bearing structural raw material in buildings, the development and innovation of concrete are particularly important. Long-afterglow luminescent materials cannot be offered to the public as standalone products; however, they can be incorporated into concrete in a certain way, allowing it to absorb light energy during the day and release the stored energy as visible light at night, continuing for several hours. Therefore, luminescent concrete, made by combining long-afterglow luminescent materials with concrete, is radiation-free and pollution-free, suitable for roadside lighting and various warning signs, and meets the aesthetic requirements of contemporary society for new building materials, possessing safety, energy-saving, and decorative significance. Summary of the Invention
[0004] The main objective of this invention is to address the problems existing in the prior art. The objective of this invention is to provide a long-afterglow luminescent concrete and its preparation method. Specifically, the method uses metal oxides as raw materials to prepare long-afterglow luminescent materials and various aggregate-free cementitious materials as raw materials to prepare high-performance concrete. The various components are mixed evenly in a mixer, and a long-afterglow luminescent concrete with excellent excitation and luminescence properties is obtained under standard curing conditions.
[0005] The present invention employs the following technical solutions to achieve the above objectives:
[0006] A type of long-afterglow luminescent concrete is prepared from the following components:
[0007] 420-485 parts by weight of cementitious material, 8-10 parts by weight of water-reducing agent, 5-10 parts by weight of long afterglow luminescent material, 5-7.5 parts by weight of admixture, and 50-80 parts by weight of water.
[0008] Preferably, the cementing material can be one or a combination of cement, silica fume, fly ash, metakaolin, lime, and mineral powder.
[0009] Furthermore, the cementing material is a combination of cement, silica fume, and fly ash.
[0010] Furthermore, the cementitious material contains the following components: 300-350 parts by weight of cement, 30-35 parts by weight of silica fume, and 90-100 parts by weight of fly ash.
[0011] Furthermore, the cement is preferably silicate cement.
[0012] Preferably, the water-reducing agent is a polycarboxylate water-reducing agent.
[0013] The preparation method of the above-mentioned long afterglow luminescent material is as follows: gallium oxide, chromium oxide and zinc oxide are ground and the long afterglow luminescent material is prepared by high temperature solid-state method.
[0014] As a preferred embodiment, the specific operation of the above-mentioned long afterglow luminescent material preparation method is as follows: gallium oxide, chromium oxide, and zinc oxide are ground, and then calcined in air at a rate of 5℃ / min to 1450℃, held at this temperature for 2 hours, and then naturally cooled to room temperature; the sintered solid mixture is ground again to obtain ZnGa2O4:Cr 3+ Long-afterglow luminescent materials.
[0015] Furthermore, in the above-mentioned method for preparing long afterglow luminescent materials, the mass ratio of gallium oxide, chromium oxide, and zinc oxide is (6.5-7.2):(0.02-0.03):(2.8-3.5).
[0016] Preferably, the admixture contains 0.1-0.25 parts by weight of glass microspheres, 0.5-1.5 parts by weight of polyvinylpyrrolidone, 0.4-0.5 parts by weight of triethanolamine, 0.5-0.75 parts by weight of calcium formate, 0.5-0.75 parts by weight of sodium tripolyphosphate, and 3-3.75 parts by weight of modified silica sol.
[0017] Furthermore, the above-mentioned modified silica sol is prepared by mixing carbomer 940, hydrogenated rosin methyl ester, and silica sol, then adding N,N-methylenebisacrylamide, and keeping it at 150-180℃ for 1-1.5h to obtain the modified silica sol.
[0018] Furthermore, in the above-mentioned method for preparing modified silica sol, the mass ratio of carbomer 940, hydrogenated rosin methyl ester, silica sol, and N,N-methylenebisacrylamide is (0.8-1.2):(0.1-0.3):(1.5-1.8):(0.3-0.5).
[0019] This invention provides a method for preparing the luminescent concrete, specifically including the following steps:
[0020] Add the water-reducing agent to water and mix well to obtain a mixed aqueous solution; put the cementitious material into a mixer and dry mix, then add the long afterglow luminescent material and continue to dry mix, add 70% of the mixed aqueous solution and mix, add the admixture and the remaining 30% of the mixed aqueous solution and continue to mix to obtain long afterglow luminescent concrete.
[0021] This invention combines long-afterglow luminescent materials with high-performance concrete, utilizing the light transmittance and excellent luminescence properties of long-afterglow luminescent materials to obtain a high-strength, long-afterglow luminescent concrete.
[0022] Based on the properties of the long-afterglow luminescent concrete mentioned above, this invention provides specific applications for the long-afterglow luminescent concrete, namely, in the fields of emergency passage indication, low-light lighting, architectural decoration, and arts and crafts.
[0023] Compared with the prior art, the beneficial effects achieved by the present invention are:
[0024] (1) This invention uses gallium oxide, chromium oxide, and zinc oxide as raw materials, and obtains a long-afterglow luminescent material with excellent excitation emission and afterglow properties after high-temperature sintering; the long-afterglow luminescent material is mixed with cementitious materials, and high-performance luminescent concrete is prepared by controlling the proportion of long-afterglow luminescent material introduced. In the preparation process of high-performance concrete, the long-afterglow luminescent material is added as a special raw material, and the prepared long-afterglow luminescent concrete composite material can simultaneously have the characteristics of high strength and strong light transmittance.
[0025] (2) In the preparation process of long afterglow concrete of the present invention, the addition of luminescent materials can affect the mechanical properties of concrete to a certain extent. Therefore, the addition of modified silica sol, glass microspheres, polyvinylpyrrolidone and other components to the concrete can effectively avoid the adverse effects of luminescent materials on mechanical properties and ensure that the concrete has good mechanical properties. The preparation method of the present invention is simple, has high luminescence efficiency, is highly practical, and is easy to promote. Attached Figure Description
[0026] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.
[0027] Figure 1 Example 1: Mechanical property testing of concrete samples.
[0028] Figure 2 Example 1: Comparative test of luminescence in concrete fragments.
[0029] Figure 3 Example 1: Scanning electron micrograph of a concrete sample.
[0030] Figure 4 Example 1: Local elemental distribution image of a concrete sample. Detailed Implementation
[0031] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.
[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0033] Example 1
[0034] First, prepare the long afterglow luminescent material according to the following steps:
[0035] (1) Accurately weigh 6.9592g of solid gallium oxide powder, 0.0282g of solid chromium oxide powder, and 3.0214g of solid zinc oxide powder and place them in an agate mortar and grind for 10 minutes to grind the powder evenly.
[0036] (2) Transfer the uniformly ground powder into an alumina crucible, place the crucible in a muffle furnace, and calcine it at 1450℃ at a rate of 5℃ / min under an air atmosphere. Hold the calcined powder at this temperature for 2 hours, and then allow it to cool naturally to room temperature. Grind the sintered solid mixture again in an agate mortar until fully ground to obtain near-infrared ZnGa2O4:Cr. 3+ Long-afterglow luminescent materials.
[0037] Next, prepare the modified silica sol according to the following steps:
[0038] (3) Mix 0.96g carbomer 940, 0.21g hydrogenated rosin methyl ester and 1.69g silica sol, then add 0.42g N,N-methylenebisacrylamide and keep warm at 180℃ for 1h to obtain modified silica sol.
[0039] Finally, the long-afterglow luminescent concrete and its matrix are prepared according to the following steps:
[0040] (4) Weigh 9.1124g of polycarboxylate superplasticizer and 61.834g of water, add the polycarboxylate superplasticizer to the water and stir until the mixture is uniform to obtain a mixed aqueous solution;
[0041] (5) Put 325.443g of silicate cement, 32.544g of silica fume and 97.633g of fly ash into a mixer and dry mix slowly for 3 minutes. Then add 10g of long afterglow luminescent material and continue to dry mix slowly for 2 minutes. Add 70% of the mixed aqueous solution and stir for 10 minutes. Add 0.18g of glass microspheres, 1.32g of polyvinylpyrrolidone, 0.46g of triethanolamine, 0.69g of calcium formate, 0.66g of sodium tripolyphosphate, 3.11g of modified silica sol and the remaining 30% of the mixed aqueous solution and continue to stir for 3 minutes to obtain long afterglow luminescent concrete.
[0042] (6) The long afterglow luminescent concrete is quickly mixed for 3 minutes until the slurry is formed. The slurry is poured into a pre-prepared mold, and after being vibrated thoroughly, a layer of plastic wrap is covered on the surface. The mold is placed in the curing room for curing for one day. After the slurry is formed, it is demolded. The long afterglow luminescent concrete matrix is obtained after seven days of standard curing.
[0043] Example 2
[0044] First, prepare the long afterglow luminescent material according to the following steps:
[0045] (1) Accurately weigh 7.2g of solid gallium oxide powder, 0.03g of solid chromium oxide powder, and 3.5g of solid zinc oxide powder and place them in an agate mortar and grind for 10 minutes to grind the powder evenly.
[0046] (2) Transfer the uniformly ground powder into an alumina crucible, place the crucible in a muffle furnace, and calcine it at 1450℃ at a rate of 5℃ / min under an air atmosphere. Hold the calcined powder at this temperature for 2 hours, and then allow it to cool naturally to room temperature. Grind the sintered solid mixture again in an agate mortar until fully ground to obtain near-infrared ZnGa2O4:Cr. 3+ Long-afterglow luminescent materials.
[0047] Next, prepare the modified silica sol according to the following steps:
[0048] (3) Mix 1.2g carbomer 940, 0.3g hydrogenated rosin methyl ester and 1.8g silica sol, then add 0.5g N,N-methylenebisacrylamide and keep warm at 180℃ for 1h to obtain modified silica sol.
[0049] Finally, the long-afterglow luminescent concrete and its matrix are prepared according to the following steps:
[0050] (4) Weigh 8g of polycarboxylate superplasticizer and 80g of water, add the polycarboxylate superplasticizer to the water and stir until the mixture is uniform to obtain a mixed aqueous solution;
[0051] (5) Put 350g of silicate cement, 35g of silica fume, and 100g of fly ash into a mixer and dry mix slowly for 3 minutes. Then add 10g of long afterglow luminescent material and continue to dry mix slowly for 2 minutes. Add 70% of the mixed aqueous solution and stir for 10 minutes. Add 0.1g of glass microspheres, 0.5g of polyvinylpyrrolidone, 0.4g of triethanolamine, 0.5g of calcium formate, 0.5g of sodium tripolyphosphate, 3g of modified silica sol, and the remaining 30% of the mixed aqueous solution and continue to stir for 3 minutes to obtain long afterglow luminescent concrete.
[0052] (6) The long afterglow luminescent concrete is quickly mixed for 3 minutes until the slurry is formed. The slurry is poured into a pre-prepared mold, and after being vibrated thoroughly, a layer of plastic wrap is covered on the surface. The mold is placed in the curing room for curing for one day. After the slurry is formed, it is demolded. The long afterglow luminescent concrete matrix is obtained after seven days of standard curing.
[0053] Example 3
[0054] First, prepare the long afterglow luminescent material according to the following steps:
[0055] (1) Accurately weigh 6.5g of solid gallium oxide powder, 0.02g of solid chromium oxide powder and 2.8g of solid zinc oxide powder and place them in an agate mortar and grind for 10 minutes to grind the powder evenly.
[0056] (2) Transfer the uniformly ground powder into an alumina crucible, place the crucible in a muffle furnace, and calcine it at 1450℃ at a rate of 5℃ / min under an air atmosphere. Hold the calcined powder at this temperature for 2 hours, and then allow it to cool naturally to room temperature. Grind the sintered solid mixture again in an agate mortar until fully ground to obtain near-infrared ZnGa2O4:Cr. 3+ Long-afterglow luminescent materials.
[0057] Next, prepare the modified silica sol according to the following steps:
[0058] (3) Mix 0.8g carbomer 940, 0.1g hydrogenated rosin methyl ester and 1.5g silica sol, then add 0.3g N,N-methylenebisacrylamide and keep warm at 150℃ for 1.5h to obtain modified silica sol.
[0059] Finally, the long-afterglow luminescent concrete and its matrix are prepared according to the following steps:
[0060] (4) Weigh 10g of polycarboxylate superplasticizer and 50g of water, add the polycarboxylate superplasticizer to the water and stir until the mixture is uniform to obtain a mixed aqueous solution;
[0061] (5) Put 300g of silicate cement, 30g of silica fume and 90g of fly ash into a mixer and dry mix slowly for 3 minutes. Then add 5g of long afterglow luminescent material and continue to dry mix slowly for 2 minutes. Add 70% of the mixed aqueous solution and stir for 10 minutes. Add 0.25g of glass microspheres, 1.5g of polyvinylpyrrolidone, 0.5g of triethanolamine, 0.75g of calcium formate, 0.75g of sodium tripolyphosphate, 3.75g of modified silica sol and the remaining 30% of the mixed aqueous solution and continue to stir for 3 minutes to obtain long afterglow luminescent concrete.
[0062] (6) The long afterglow luminescent concrete is quickly mixed for 3 minutes until the slurry is formed. The slurry is poured into a pre-prepared mold, and after being vibrated thoroughly, a layer of plastic wrap is covered on the surface. The mold is placed in the curing room for curing for one day. After the slurry is formed, it is demolded. The long afterglow luminescent concrete matrix is obtained after seven days of standard curing.
[0063] Example 4
[0064] First, prepare the long afterglow luminescent material according to the following steps:
[0065] (1) Accurately weigh 6.84g of solid gallium oxide powder, 0.0266g of solid chromium oxide powder and 2.76g of solid zinc oxide powder and place them in an agate mortar and grind for 10 minutes to grind the powder evenly.
[0066] (2) Transfer the uniformly ground powder into an alumina crucible, place the crucible in a muffle furnace, and calcine it at 1450℃ at a rate of 5℃ / min under an air atmosphere. Hold the calcined powder at this temperature for 2 hours, and then allow it to cool naturally to room temperature. Grind the sintered solid mixture again in an agate mortar until fully ground to obtain near-infrared ZnGa2O4:Cr. 3+ Long-afterglow luminescent materials.
[0067] Next, prepare the modified silica sol according to the following steps:
[0068] (3) Mix 1.0g carbomer 940, 0.2g hydrogenated rosin methyl ester and 1.6g silica sol, then add 0.4g N,N-methylenebisacrylamide and keep warm at 160℃ for 1.3h to obtain modified silica sol.
[0069] Finally, the long-afterglow luminescent concrete and its matrix are prepared according to the following steps:
[0070] (4) Weigh 9g of polycarboxylate superplasticizer and 65g of water, add the polycarboxylate superplasticizer to the water and stir until the mixture is uniform to obtain a mixed aqueous solution;
[0071] (5) Put 320g of silicate cement, 33g of silica fume and 95g of fly ash into a mixer and dry mix slowly for 3 minutes. Then add 8g of long afterglow luminescent material and continue to dry mix slowly for 2 minutes. Add 70% of the mixed aqueous solution and stir for 10 minutes. Add 0.2g of glass microspheres, 1.2g of polyvinylpyrrolidone, 0.45g of triethanolamine, 0.6g of calcium formate, 0.65g of sodium tripolyphosphate, 3.5g of modified silica sol and the remaining 30% of the mixed aqueous solution and continue to stir for 3 minutes to obtain long afterglow luminescent concrete.
[0072] (6) The long afterglow luminescent concrete is quickly mixed for 3 minutes until the slurry is formed. The slurry is poured into a pre-prepared mold, and after being vibrated thoroughly, a layer of plastic wrap is covered on the surface. The mold is placed in the curing room for curing for one day. After the slurry is formed, it is demolded. The long afterglow luminescent concrete matrix is obtained after seven days of standard curing.
[0073] Example 5
[0074] First, prepare the long afterglow luminescent material according to the following steps:
[0075] (1) Accurately weigh 6.84g of solid gallium oxide powder, 0.0266g of solid chromium oxide powder and 2.76g of solid zinc oxide powder and place them in an agate mortar and grind for 10 minutes to grind the powder evenly.
[0076] (2) Transfer the uniformly ground powder into an alumina crucible, place the crucible in a muffle furnace, and calcine it at 1450℃ at a rate of 5℃ / min under an air atmosphere. Hold the calcined powder at this temperature for 2 hours, and then allow it to cool naturally to room temperature. Grind the sintered solid mixture again in an agate mortar until fully ground to obtain near-infrared ZnGa2O4:Cr. 3+ Long-afterglow luminescent materials.
[0077] Next, prepare the modified silica sol according to the following steps:
[0078] (3) Mix 1.0g carbomer 940, 0.2g hydrogenated rosin methyl ester and 1.6g silica sol, then add 0.4g N,N-methylenebisacrylamide and keep warm at 160℃ for 1.3h to obtain modified silica sol.
[0079] Finally, the long-afterglow luminescent concrete and its matrix are prepared according to the following steps:
[0080] (4) Weigh 9g of polycarboxylate superplasticizer and 65g of water, add the polycarboxylate superplasticizer to the water and stir until the mixture is uniform to obtain a mixed aqueous solution;
[0081] (5) Put 320g of silicate cement, 33g of metakaolin, and 95g of mineral ash into a mixer and dry mix slowly for 3 minutes. Then add 8g of long afterglow luminescent material and continue to dry mix slowly for 2 minutes. Add 70% of the mixed aqueous solution and stir for 10 minutes. Add 0.2g of glass microspheres, 1.2g of polyvinylpyrrolidone, 0.45g of triethanolamine, 0.6g of calcium formate, 0.65g of sodium tripolyphosphate, 3.5g of modified silica sol, and the remaining 30% of the mixed aqueous solution and continue to stir for 3 minutes to obtain long afterglow luminescent concrete.
[0082] (6) The long afterglow luminescent concrete is quickly mixed for 3 minutes until the slurry is formed. The slurry is poured into a pre-prepared mold, and after being vibrated thoroughly, a layer of plastic wrap is covered on the surface. The mold is placed in the curing room for curing for one day. After the slurry is formed, it is demolded. The long afterglow luminescent concrete matrix is obtained after seven days of standard curing.
[0083] Comparative Example 1
[0084] First, prepare the long afterglow luminescent material according to the following steps:
[0085] (1) Accurately weigh 7.13g of solid gallium oxide powder and place it in an agate mortar and grind for 10 minutes to grind the powder evenly;
[0086] (2) Transfer the uniformly ground powder into an alumina crucible and place the crucible in a muffle furnace. Under an air atmosphere, heat the mixture to 1450°C at a rate of 5°C / min and calcine it. Hold the mixture at this temperature for 2 hours and then allow it to cool naturally to room temperature. Place the sintered solid mixture back into an agate mortar and grind it thoroughly to obtain a long afterglow luminescent material.
[0087] Next, long-afterglow luminescent concrete and its matrix are prepared according to the following steps:
[0088] (4) Weigh 9g of polycarboxylate superplasticizer and 65g of water, add the polycarboxylate superplasticizer to the water and stir until the mixture is uniform to obtain a mixed aqueous solution;
[0089] (5) Put 320g of silicate cement, 33g of silica fume and 95g of fly ash into a mixer and dry mix slowly for 3 minutes. Then add 8g of long afterglow luminescent material and continue to dry mix slowly for 2 minutes. Add 70% of the mixed aqueous solution and stir for 10 minutes. Add 1.2g of polyvinylpyrrolidone, 0.45g of triethanolamine, 3.5g of silica sol and the remaining 30% of the mixed aqueous solution and continue to stir for 3 minutes to obtain long afterglow luminescent concrete.
[0090] (6) The long afterglow luminescent concrete is quickly mixed for 3 minutes until the slurry is formed. The slurry is poured into a pre-prepared mold, and after being vibrated thoroughly, a layer of plastic wrap is covered on the surface. The mold is placed in the curing room for curing for one day. After the slurry is formed, it is demolded. The long afterglow luminescent concrete matrix is obtained after seven days of standard curing.
[0091] Comparative Example 2
[0092] First, prepare the long afterglow luminescent material according to the following steps:
[0093] (1) Accurately weigh 6.93g of solid gallium oxide powder and 2.52g of solid zinc oxide powder and place them in an agate mortar and grind for 10 minutes to grind the powder evenly.
[0094] (2) Transfer the uniformly ground powder into an alumina crucible and place the crucible in a muffle furnace. Under an air atmosphere, heat the mixture to 1450°C at a rate of 5°C / min and calcine it. Hold the mixture at this temperature for 2 hours and then allow it to cool naturally to room temperature. Place the sintered solid mixture back into an agate mortar and grind it thoroughly to obtain a long afterglow luminescent material.
[0095] Finally, the long-afterglow luminescent concrete and its matrix are prepared according to the following steps:
[0096] (4) Weigh 9g of polycarboxylate superplasticizer and 65g of water, add the polycarboxylate superplasticizer to the water and stir until the mixture is uniform to obtain a mixed aqueous solution;
[0097] (5) Put 320g of silicate cement, 33g of silica fume and 95g of fly ash into a mixer and dry mix slowly for 3 minutes. Then add 8g of long afterglow luminescent material and continue to dry mix slowly for 2 minutes. Add 70% of the mixed aqueous solution and stir for 10 minutes. Add the remaining 30% of the mixed aqueous solution and continue to stir for 3 minutes to obtain long afterglow luminescent concrete.
[0098] (6) The long afterglow luminescent concrete is quickly mixed for 3 minutes until the slurry is formed. The slurry is poured into a pre-prepared mold, and after being vibrated thoroughly, a layer of plastic wrap is covered on the surface. The mold is placed in the curing room for curing for one day. After the slurry is formed, it is demolded. The long afterglow luminescent concrete matrix is obtained after seven days of standard curing.
[0099] Comparative Example 3
[0100] First, prepare the long afterglow luminescent material according to the following steps:
[0101] (1) Accurately weigh 6.58g of solid gallium oxide powder, 1.28g of solid chromium oxide powder and 2.66g of solid zinc oxide powder and place them in an agate mortar and grind for 10 minutes to grind the powder evenly.
[0102] (2) Transfer the uniformly ground powder into an alumina crucible and place the crucible in a muffle furnace. Under an air atmosphere, heat the mixture to 1450°C at a rate of 5°C / min and calcine it. Hold the mixture at this temperature for 2 hours and then allow it to cool naturally to room temperature. Place the sintered solid mixture back into an agate mortar and grind it thoroughly to obtain a long afterglow luminescent material.
[0103] Next, prepare the modified silica sol according to the following steps:
[0104] (3) Mix 1.0g of carbomer 940 and 1.6g of silica sol, add 0.4g of N,N-methylenebisacrylamide, and keep warm at 160℃ for 1.3h to obtain modified silica sol.
[0105] Finally, the long-afterglow luminescent concrete and its matrix are prepared according to the following steps:
[0106] (4) Weigh 9g of polycarboxylate superplasticizer and 65g of water, add the polycarboxylate superplasticizer to the water and stir until the mixture is uniform to obtain a mixed aqueous solution;
[0107] (5) Put 320g of silicate cement, 33g of silica fume, 95g of fly ash, 8g of long afterglow luminescent material, 0.2g of glass microspheres, 0.6g of calcium formate, 0.65g of sodium tripolyphosphate, and 3.5g of modified silica sol into a mixer and dry mix slowly for 5 minutes. Then add the mixed aqueous solution and stir for 20 minutes to obtain long afterglow luminescent concrete.
[0108] (6) The long afterglow luminescent concrete is quickly mixed for 3 minutes until the slurry is formed. The slurry is poured into a pre-prepared mold, and after being vibrated thoroughly, a layer of plastic wrap is covered on the surface. The mold is placed in the curing room for curing for one day. After the slurry is formed, it is demolded. The long afterglow luminescent concrete matrix is obtained after seven days of standard curing.
[0109] Performance testing
[0110] The concrete matrices prepared in Examples 1-5 and Comparative Examples 1-3 were tested for compressive strength, tensile strength, luminous intensity and afterglow time.
[0111] Results and analysis:
[0112] As shown in Table 1 below, the long-afterglow concrete prepared by this invention has a longer afterglow time, stronger luminescence intensity, and better compressive and tensile strength, which is superior to the concrete prepared in Comparative Examples 1-3. Specifically, the concrete prepared in Comparative Example 2 only added luminescent materials without using silica sol or admixtures, resulting in poor compressive and tensile strengths; the concrete prepared in Comparative Example 3 did not modify the silica sol, and although its compressive and tensile strengths were improved, they were still inferior to those of this invention; the luminescent material in Comparative Example 1 was only gallium oxide, which had low luminescence intensity and a short afterglow time.
[0113] Table 1. Test results of concrete matrix properties
[0114] index Compressive strength (MPa) Tensile strength (MPa) Afterglow duration (min) <![CDATA[Luminous intensity (mcd / m 2 )]]> Example 1 86 31 1306 1602 Example 2 83 29 1369 1547 Example 3 87 32 1264 1632 Example 4 85 34 1338 1598 Example 5 79 26 1401 1619 Comparative Example 1 75 17 958 1051 Comparative Example 2 55 14 1183 1426 Comparative Example 3 69 19 1535 1714
Claims
1. A long-afterglow luminescent concrete, characterized in that, It is prepared from the following ingredients: 420-485 parts by weight of cementitious material, 8-10 parts by weight of water-reducing agent, 5-10 parts by weight of long afterglow luminescent material, 5-7.5 parts by weight of admixture, and 50-80 parts by weight of water; The admixture contains 0.1-0.25 parts by weight of glass microspheres, 0.5-1.5 parts by weight of polyvinylpyrrolidone, 0.4-0.5 parts by weight of triethanolamine, 0.5-0.75 parts by weight of calcium formate, 0.5-0.75 parts by weight of sodium tripolyphosphate, and 3-3.75 parts by weight of modified silica sol. The modified silica sol is prepared by: Carbomer 940, hydrogenated rosin methyl ester, and silica sol are mixed and then N,N-methylenebisacrylamide is added. The mixture is kept at 150-180℃ for 1-1.5 hours to obtain modified silica sol. The mass ratio of carbomer 940, hydrogenated rosin methyl ester, silica sol, and N,N-methylenebisacrylamide is (0.8-1.2):(0.1-0.3):(1.5-1.8):(0.3-0.5).
2. The long-afterglow luminescent concrete according to claim 1, characterized in that, The cementing material is one or more of the following: cement, silica fume, fly ash, metakaolin, lime, and mineral powder.
3. The long-afterglow luminescent concrete according to claim 2, characterized in that, The cementing material is a combination of cement, silica fume, and fly ash.
4. The long-afterglow luminescent concrete according to claim 3, characterized in that, The cementitious material contains the following components: 300-350 parts by weight of cement, 30-35 parts by weight of silica fume, and 90-100 parts by weight of fly ash.
5. The long-afterglow luminescent concrete according to any one of claims 1-4, characterized in that, The preparation method of the long afterglow luminescent material is as follows: gallium oxide, chromium oxide, and zinc oxide are ground, and then calcined at 1450°C at a rate of 5°C / min in air atmosphere, held at this temperature for 2 hours, and then naturally cooled to room temperature; the sintered solid mixture is ground again to obtain ZnGa2O4:Cr 3+ Long-afterglow luminescent materials.
6. The long-afterglow luminescent concrete according to claim 5, characterized in that, In the method for preparing the long afterglow luminescent material, the mass ratio of gallium oxide, chromium oxide, and zinc oxide is (6.5-7.2):(0.02-0.03):(2.8-3.5).
7. A method for preparing long-afterglow luminescent concrete as described in any one of claims 1-6, characterized in that, The preparation method includes the following steps: Add the water-reducing agent to water and mix well to obtain a mixed aqueous solution; put the cementitious material into a mixer and dry mix, then add the long afterglow luminescent material and continue to dry mix, add 70% of the mixed aqueous solution and mix, add the admixture and the remaining 30% of the mixed aqueous solution and continue to mix to obtain long afterglow luminescent concrete.