Luminescent concrete and preparation method thereof

Abstract

The invention discloses luminous concrete and a preparation method, and relates to the technical field of concrete. The luminous concrete is prepared from the following raw materials in parts by mass: 35 to 40 parts of cement, 8 to 10 parts of fly ash, 70 to 80 parts of tempered luminous aggregate containing epoxy resin and ceramic powder, 10 to 15 parts of luminous powder, 8 to 12 parts of tempered glass aggregate, 130 to 150 parts of fine aggregate, 1 to 2 parts of heavy calcium powder, 2 to 4 parts of chopped optical fiber, 5 to 6 parts of additive and 10 to 15 parts of water. While the workability of the concrete is improved and the cost performance of production and preparation is improved, the compression resistance and crack resistance of the formed concrete are greatly enhanced, the mechanical strength of the formed concrete is improved, the visual brightness of light and the visual attractiveness of the concrete during luminescence are greatly improved, and the luminescence property of the concrete is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete, and in particular to luminous concrete and a preparation method thereof. Background Art

[0002] Concrete is generally made of cement as the main cementitious material, sand and stone as aggregates, mixed with water (which may contain admixtures) in a certain proportion, and is currently one of the most important civil engineering materials; while luminous concrete is a new type of building material formed by combining long afterglow materials and concrete. It has both self-luminous function and beautification effect, and has broad application prospects in roads, communities, squares, parks, parking lots, etc. However, the combination of traditional luminous concrete, long afterglow materials and concrete, often makes its mechanical strength poor, and at the same time, the luminous performance is also average.

[0003] The related research on luminous concrete in the prior art, such as patent application CN110526633A, a kind of light-transmitting and self-luminous concrete and its preparation method and application, etc., can achieve good energy storage and luminescence effects to a certain extent through the combined use of luminous stone and luminous powder, and can improve the flexural and compressive strength of concrete after molding to a certain extent by combining cement with main materials such as sand, and using auxiliary materials such as fibers and additives such as water repellent. However, the prior art has the problems of general workability and low cost performance of production and preparation. In addition, the improvement effect of the prior art on the compressive and crack resistance is general, and the visual brightness of the light and the visual aesthetics of the concrete when luminous are also general. Ultimately, the overall improvement of the mechanical strength and luminescence performance of the prior art is still relatively limited.

[0004] Therefore, a new technical solution is needed to solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide a luminous concrete and a preparation method to solve the technical problem that the prior art and workability proposed in the above background technology are general, the production and preparation cost performance is not high, and the improvement effect of the prior art on the compressive and crack resistance performance is general, the visual brightness of the light and the visual aesthetics of the concrete are also general, and ultimately the overall improvement of the mechanical strength and luminous performance of the prior art is still relatively limited.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A luminous concrete comprises the following raw materials in parts by weight: 35-40 parts of cement, 8-10 parts of fly ash, 70-80 parts of tempered luminous aggregate containing epoxy resin and ceramic powder, 10-15 parts of luminous powder, 8-12 parts of tempered glass aggregate, 130-150 parts of fine aggregate, 1-2 parts of heavy calcium powder, 2-4 parts of short-cut optical fiber, 5-6 parts of admixture and 10-15 parts of water.

[0007] Furthermore, the cement is any one or a combination of silicate cement, aluminum salt cement, sulphoaluminate cement, and basic magnesium sulfate cement, and the tempered luminescent aggregate is epoxy resin, luminescent powder, ceramic powder and montmorillonite in a mass ratio of 3 to 4:2 to 3:2 to 2.5:1, wherein the luminescent powder is Eu 2+ 、Dy 3+ 、Nd 3+ Co-doped silicate long afterglow luminescent powder and Eu 2+ 、Dy 3+ The co-doped strontium aluminate long afterglow luminescent powder, and the luminescent powder added alone is alkaline earth boroaluminate long afterglow luminescent powder and Eu in a mass ratio of 1:1 to 2. 2+ 、Dy 3+ 、Nd 3+ The co-doped silicate long afterglow luminescent powder, the tempered glass aggregate is made by crushing and tempering the scraps of glass production, and the particle size is 4-8mm, the fine aggregate is the particles with a particle size of 1.5-2.5mm obtained by crushing and screening the concrete or stone bricks discarded from the construction, and the admixture is prepared by mixing an early strength type polycarboxylic acid water reducer, a thickener, a defoamer and water, and the mass percentage ratio of each raw material except water in the admixture is: 60-65% of the early strength type polycarboxylic acid water reducer, 3-5% of the thickener, and 0.2-0.5% of the defoamer.

[0008] Furthermore, the defoamer is a polyether defoamer with a viscosity of 1200 mPa·s, the viscosity enhancer is any combination of at least two of polyacrylamide, hydroxypropyl methylcellulose and hydroxyethyl cellulose, and the early-strength polycarboxylic acid water reducer is synthesized by using hydroxybutyl vinyl polyoxyethylene ether and acrylic acid as raw materials and adopting an aqueous solution free radical polymerization method under a redox initiation system, and its acid-ether ratio is 4.5 to 6:1.

[0009] In addition to the above technical solutions, the present invention also provides a method for preparing the above luminous concrete, comprising the following steps: S1. Pour 2 / 5 of the formula amount of water into a mixer to moisten the mixture, then add the formula amount of fine aggregate, and stir evenly to obtain a first mixture; S2, adding the formulated amount of cement, fly ash, luminescent powder and heavy calcium powder into the first mixture, stirring evenly, to obtain a second mixture; S3. While the second mixture is being stirred, a formulated amount of tempered luminous aggregate, tempered glass aggregate, chopped optical fiber and a remaining formulated amount of water are added to the second mixture, and stirred evenly to obtain a third mixture; S4. While the third mixture is being stirred, a prescribed amount of admixture is added to the third mixture, and after stirring evenly, a finished luminous concrete is obtained.

[0010] Compared with the prior art, the present invention has the following beneficial effects: 1. The cement, fly ash, tempered luminescent aggregate containing epoxy resin and ceramic powder, luminescent powder, tempered glass aggregate, fine aggregate, heavy calcium powder, chopped optical fiber, admixture and water in the present invention cooperate with each other. When the luminescent powder is added, tempered glass aggregate and tempered luminescent aggregate containing epoxy resin and ceramic powder are introduced. The good bonding compatibility between the tempered luminescent aggregate and the other components of the concrete is used to form a high-hardness skeleton support system and a luminescent system with high uniformity, high light transmittance and high brightness inside the concrete, which greatly enhances the compressive and crack resistance of the concrete after molding, improves the mechanical strength of the concrete after molding, and greatly increases the luminous light. The visual brightness and visual aesthetics of concrete are improved, and the luminescent properties of concrete are enhanced. On this basis, the heavy calcium powder and short-cut optical fiber with light-guiding effect added thereto, under the joint action of cement, fly ash and admixtures, can not only reduce the use of luminescent materials such as luminescent powder and improve the production and preparation cost performance, but also realize the filling of the skeleton support system and the luminescent system, improve the aesthetics of the concrete structure surface, further enhance the luminescent brightness, ensure the luminescent performance, further improve the strength and toughness of the concrete after molding, and improve the fluidity and other workability of the concrete. In addition, the present invention fully improves the workability of the mixed soil by reasonably setting the feeding order of the concrete raw materials.

[0011] 2. The present invention effectively improves the overall anti-aging and corrosion resistance of concrete by adding tempered luminescent aggregate made of epoxy resin, luminescent powder, ceramic powder and montmorillonite into concrete. At the same time, the added ceramic powder can effectively increase the hardness of the epoxy resin, thereby achieving full improvement of the hardness of the tempered luminescent aggregate on the basis of tempering treatment, and ultimately further improving the overall strength of the concrete.

[0012] 3. The admixture in the present invention is prepared by mixing an early-strength polycarboxylate water-reducing agent, a viscosity-increasing agent, a defoaming agent and water. The combination of the early-strength polycarboxylate water-reducing agent, heavy calcium powder, and ceramic powder in the tempered luminescent aggregate can effectively solve the problem of weakening concrete strength caused by the addition of long-lasting luminescent powder. What's more, the early and late strengths of the concrete can be greatly improved, thereby further ensuring the overall strength of the concrete.

[0013] 4. The tempered glass aggregate in the present invention is made from the scraps of glass production that are crushed and tempered, and the raw material of the fine aggregate is also concrete or stone bricks discarded from construction, which effectively reduces the cost of producing and preparing concrete, thereby further improving the cost-effectiveness of concrete production and preparation. On this basis, the present invention further ensures the overall strength of the concrete by strictly controlling the particle size of the tempered glass aggregate and the fine aggregate. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention will be described clearly and completely below.

[0015] The raw materials in the present invention are commercially available raw materials.

[0016] Example 1 S1. Preparation of admixtures: First, hydroxybutyl vinyl polyoxyethylene ether, hydrogen peroxide, ferrous sulfate, and deionized water were stirred for 5 min, and then a mixed aqueous solution of mercaptoethanol and a reducing agent (E51) and an aqueous solution of acrylic acid were added dropwise. The addition time of the mixed aqueous solution of mercaptoethanol and a reducing agent (E51) was controlled to be 50 min, and the addition time of the aqueous solution of acrylic acid was controlled to be 30 min. After the addition was completed, stirring and heat preservation were continued for 1 h, and water and alkali were added to obtain an early-strength polycarboxylic acid water reducer with an acid-ether ratio of 4.5:1. Then, polyacrylamide and hydroxyethyl cellulose were mixed uniformly in a mass ratio of 1:3 to prepare a viscosity enhancer. Finally, the early-strength polycarboxylic acid water reducer, the viscosity enhancer, a polyether defoamer with a viscosity of 1200 mPa·s, and water were mixed uniformly to prepare an admixture. The mass percentage ratio of each raw material in the admixture was: 60% of the early-strength polycarboxylic acid water reducer, 3% of the viscosity enhancer, 0.2% of the defoamer, and 36.8% of water. S2. Preparation of tempered luminescent aggregate: First, 2+ 、Dy 3+ 、Nd 3+ Co-doped silicate long afterglow luminescent powder and Eu2+, Dy 3+ The co-doped strontium aluminate long afterglow luminescent powder is mixed uniformly in a mass ratio of 1:4 to prepare a luminescent powder as one of the raw materials of the tempered luminescent aggregate, and then the luminescent powder, epoxy resin, titanium dioxide powder and montmorillonite are mixed uniformly in a mass ratio of 2:3:2:1, and then tempered to prepare a tempered luminescent aggregate; S3. Preparation of separately added luminescent powder: alkaline earth boroaluminate long afterglow luminescent powder and Eu 2+ 、Dy 3+ 、Nd 3+ The co-doped silicate long afterglow luminescent powders are uniformly mixed in a mass ratio of 1:1 to obtain a single added luminescent powder; S4. Weigh the raw materials by weight: 40 parts of cement, 10 parts of fly ash, 80 parts of tempered luminescent aggregate, 15 parts of luminescent powder, 12 parts of tempered glass aggregate, 150 parts of fine aggregate, 2 parts of heavy calcium powder, 4 parts of chopped optical fiber, 6 parts of admixture and 15 parts of water, wherein the tempered glass aggregate is made of the scraps of glass production crushed and tempered, with a particle size of 4 to 8 mm, and the fine aggregate is the particles with a particle size of 1.5 to 2.5 mm obtained after crushing and screening of concrete or stone bricks from construction waste; S5. Preparation of finished luminous concrete: First, pour 2 / 5 of the formula amount of water into a mixer to moisten it, then add fine aggregate and stir evenly to obtain a first mixture; then, add cement, fly ash, luminescent powder and heavy calcium powder to the first mixture and stir evenly to obtain a second mixture; then, while the second mixture is being stirred, add tempered luminous aggregate, tempered glass aggregate, chopped optical fiber and 3 / 5 of the formula amount of water to the second mixture and stir evenly to obtain a third mixture; finally, while the third mixture is being stirred, add admixtures to the third mixture and stir evenly to obtain a finished luminous concrete. Example

[0017] S1. Preparation of admixtures: First, hydroxybutyl vinyl polyoxyethylene ether, hydrogen peroxide, ferrous sulfate, and deionized water were stirred for 5 min, and then a mixed aqueous solution of mercaptoethanol and a reducing agent (E51) and an aqueous solution of acrylic acid were added dropwise. The addition time of the mixed aqueous solution of mercaptoethanol and a reducing agent (E51) was controlled to be 50 min, and the addition time of the aqueous solution of acrylic acid was controlled to be 30 min. After the addition was completed, stirring and heat preservation were continued for 1 h, and water and alkali were added to obtain an early-strength polycarboxylate water reducer with an acid-ether ratio of 6:1. Then, hydroxypropyl methylcellulose and hydroxyethyl cellulose were mixed at a mass ratio of 1:4 to obtain a viscosity enhancer. Finally, the early-strength polycarboxylate water reducer, the viscosity enhancer, a polyether defoamer with a viscosity of 1200 mPa·s, and water were mixed to obtain an admixture. The mass percentage ratio of each raw material in the admixture was: 65% of the early-strength polycarboxylate water reducer, 5% of the viscosity enhancer, 0.5% of the defoamer, and 29.5% of the water. S2. Preparation of tempered luminescent aggregate: First, 2+ 、Dy 3+ 、Nd 3+ Co-doped silicate long afterglow luminescent powder and Eu2+, Dy 3+ The co-doped strontium aluminate long afterglow luminescent powder is mixed uniformly in a mass ratio of 1:5 to prepare a luminescent powder as one of the raw materials of the tempered luminescent aggregate, and then the luminescent powder, epoxy resin, silica powder and montmorillonite are mixed uniformly in a mass ratio of 3:4:2.5:1, and then tempered to prepare a tempered luminescent aggregate; S3. Preparation of separately added luminescent powder: alkaline earth boroaluminate long afterglow luminescent powder and Eu 2+ 、Dy 3+ 、Nd 3+ The co-doped silicate long afterglow luminescent powders are uniformly mixed in a mass ratio of 1:2 to obtain a single added luminescent powder; S4. Weigh the raw materials by weight: 35 parts of silicate cement, 8 parts of fly ash, 70 parts of tempered luminescent aggregate, 10 parts of luminescent powder, 8 parts of tempered glass aggregate, 130 parts of fine aggregate, 1 part of heavy calcium powder, 2 parts of short-cut optical fiber, 5 parts of admixture and 10 parts of water, wherein the tempered glass aggregate is made by crushing and tempering the scraps of glass production, with a particle size of 4 to 8 mm, and the fine aggregate is the particles with a particle size of 1.5 to 2.5 mm obtained by crushing and screening the concrete or stone bricks discarded from the construction; S5. Preparation of finished luminous concrete: First, pour 2 / 5 of the formula amount of water into a mixer to moisten it, then add fine aggregate and stir evenly to obtain a first mixture; then, add cement, fly ash, luminescent powder and heavy calcium powder to the first mixture and stir evenly to obtain a second mixture; then, while the second mixture is being stirred, add tempered luminous aggregate, tempered glass aggregate, chopped optical fiber and 3 / 5 of the formula amount of water to the second mixture and stir evenly to obtain a third mixture; finally, while the third mixture is being stirred, add admixtures to the third mixture and stir evenly to obtain a finished luminous concrete.

[0018] Example 3 S1. Preparation of additives: First, hydroxybutyl vinyl polyoxyethylene ether, hydrogen peroxide, ferrous sulfate, and deionized water were stirred for 5 min, and then a mixed aqueous solution of mercaptoethanol and a reducing agent (E51) and an aqueous solution of acrylic acid were added dropwise. The addition time of the mixed aqueous solution of mercaptoethanol and a reducing agent (E51) was controlled to be 50 min, and the addition time of the aqueous solution of acrylic acid was controlled to be 30 min. After the addition was completed, stirring was continued and the mixture was kept warm for 1 h, add water and alkali to prepare an early strength polycarboxylate water reducer, whose acid-ether ratio is 5.5:1; then, polyacrylamide, hydroxypropyl methylcellulose and hydroxyethyl cellulose are mixed uniformly in a mass ratio of 1:1:2 to prepare a viscosity enhancer; finally, the early strength polycarboxylate water reducer, the viscosity enhancer, a polyether defoamer with a viscosity of 1200 mPa·s and water are mixed uniformly to prepare an admixture, and the mass percentage ratio of each raw material in the admixture is: 62% of the early strength polycarboxylate water reducer, 4% of the viscosity enhancer, 0.4% of the defoamer, and 33.6% of water; S2. Preparation of tempered luminescent aggregate: First, 2+ 、Dy 3+ 、Nd 3+ Co-doped silicate long afterglow luminescent powder and Eu2+, Dy 3+The co-doped strontium aluminate long afterglow luminescent powder is uniformly mixed in a mass ratio of 1:4.5 to prepare a luminescent powder as one of the raw materials of the tempered luminescent aggregate, and then the luminescent powder, epoxy resin, titanium dioxide powder and montmorillonite are uniformly mixed in a mass ratio of 2.5:3.5:2.2:1, and then tempered to prepare a tempered luminescent aggregate; S3. Preparation of separately added luminescent powder: alkaline earth boroaluminate long afterglow luminescent powder and Eu 2+ 、Dy 3+ 、Nd 3+ The co-doped silicate long afterglow luminescent powders are uniformly mixed in a mass ratio of 1:1.5 to obtain a single added luminescent powder; S4. Weigh the raw materials by weight: 38 parts of cement, 9 parts of fly ash, 75 parts of tempered luminescent aggregate, 12 parts of luminescent powder, 10 parts of tempered glass aggregate, 140 parts of fine aggregate, 1.5 parts of heavy calcium powder, 3 parts of short-cut optical fiber, 5.5 parts of admixture and 12 parts of water, wherein the tempered glass aggregate is made of the scraps of glass production crushed and tempered, with a particle size of 4 to 8 mm, and the fine aggregate is the particles with a particle size of 1.5 to 2.5 mm obtained after crushing and screening of concrete or stone bricks from construction waste; S5. Preparation of finished luminous concrete: First, pour 2 / 5 of the formula amount of water into a mixer to moisten it, then add fine aggregate and stir evenly to obtain a first mixture; then, add cement, fly ash, luminescent powder and heavy calcium powder to the first mixture and stir evenly to obtain a second mixture; then, while the second mixture is being stirred, add tempered luminous aggregate, tempered glass aggregate, chopped optical fiber and 3 / 5 of the formula amount of water to the second mixture and stir evenly to obtain a third mixture; finally, while the third mixture is being stirred, add admixtures to the third mixture and stir evenly to obtain a finished luminous concrete.

[0019] The commercially available ordinary luminous concrete and the concrete prepared in Examples 1 to 3 were subjected to compressive strength test, tensile strength test, luminous intensity test and light transmittance test, respectively. The specific testing methods are as follows: 1. Compressive strength test The test was carried out in accordance with the national standard GB / T 50010-2010 "Code for Design of Concrete Structures".

[0020] 2. Tensile strength test The test was carried out in accordance with the national standard GB / T 50081-2019 "Standard for Test Methods for Mechanical Properties of Ordinary Concrete".

[0021] 3. Luminous intensity test The sample concrete slurry was poured and molded to obtain a finished concrete product. The finished concrete product was irradiated with a D65 light source with an illumination of 200Lx for 10 minutes in an environment with an indoor temperature of 22°C, and then placed in a dark environment. The maximum luminous intensity value of the finished concrete product was measured using a luminance meter.

[0022] 4. Light transmission performance test The test was carried out using a wooden device. The top of the device consisted of an acrylic LED light panel as a fixed light source. The middle consisted of a rectangular opening and a bracket for placing samples. A photometer for testing the intensity of the light source was reserved below. The average transmittance of all samples of the test sample was used as the sample transmittance.

[0023] The test results are shown in the following table:

[0024] In summary, the concrete prepared in Examples 1 to 3 has a compressive strength of up to 90 MPa and a tensile strength of up to 30 MPa after hardening. The concrete is irradiated with a D65 light source with an illumination of 200 Lx for 10 minutes in an indoor temperature of 22°C and then placed in a dark environment. The maximum luminous intensity of the concrete is measured by a luminance meter and can reach 1620 mcd / m 2 The maximum light transmittance can reach 15%, and it has excellent mechanical strength and luminous properties, which is better than the ordinary luminous concrete on the market.

Claims

1. A luminous concrete, characterized in that: The invention comprises the following raw materials in parts by weight: 35-40 parts of cement, 8-10 parts of fly ash, 70-80 parts of tempered luminescent aggregate containing epoxy resin and ceramic powder, 10-15 parts of luminescent powder, 8-12 parts of tempered glass aggregate, 130-150 parts of fine aggregate, 1-2 parts of heavy calcium powder, 2-4 parts of short-cut optical fiber, 5-6 parts of admixture and 10-15 parts of water.

2. The luminous concrete according to claim 1, characterized in that: The cement is any one of silicate cement, aluminum salt cement, sulphoaluminate cement and basic magnesium sulfate cement or a combination of several of them.

3. The luminous concrete according to claim 1, characterized in that: The tempered luminescent aggregate is epoxy resin, luminescent powder, ceramic powder and montmorillonite in a mass ratio of 3 to 4:2 to 3:2 to 2.5:1, wherein the luminescent powder is Eu 2+ 、Dy 3+ 、Nd 3+ Co-doped silicate long afterglow luminescent powder and Eu 2+ 、Dy 3+ The co-doped strontium aluminate long afterglow luminescent powder, and the luminescent powder added alone is alkaline earth boroaluminate long afterglow luminescent powder and Eu in a mass ratio of 1:1 to 2. 2+ 、Dy 3+ 、Nd 3+ Co-doped silicate long afterglow luminescent powder.

4. The luminous concrete according to claim 1, characterized in that: The tempered glass aggregate is made by crushing and tempering the scraps of glass production, and has a particle size of 4 to 8 mm.

5. The luminous concrete according to claim 1, characterized in that: The fine aggregate is concrete or stone bricks discarded from construction that are crushed and sieved to obtain particles with a particle size of 1.5 to 2.5 mm.

6. The luminous concrete according to claim 1, characterized in that: The admixture is prepared by mixing an early-strength polycarboxylic acid water-reducing agent, a viscosity-increasing agent, a defoaming agent and water. The mass percentage ratio of each raw material in the admixture except water is: 60-65% of the early-strength polycarboxylic acid water-reducing agent, 3-5% of the viscosity-increasing agent, and 0.2-0.5% of the defoaming agent.

7. The luminous concrete according to claim 6, characterized in that: The early-strength polycarboxylate water-reducing agent is synthesized by using hydroxybutyl vinyl polyoxyethylene ether and acrylic acid as raw materials and adopting a method of aqueous solution free radical polymerization under a redox initiation system, and the acid-ether ratio thereof is 4.5-6:

1.

8. The luminous concrete according to claim 6, characterized in that: The defoamer is a polyether defoamer with a viscosity of 1200 mPa·s, and the viscosity enhancer is any combination of at least two of polyacrylamide, hydroxypropyl methylcellulose and hydroxyethyl cellulose.

9. The method for preparing luminous concrete according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Pour 2 / 5 of the formula amount of water into a mixer to moisten the mixture, then add the formula amount of fine aggregate, and stir evenly to obtain a first mixture; S2, adding the formulated amount of cement, fly ash, luminescent powder and heavy calcium powder into the first mixture, stirring evenly, to obtain a second mixture; S3, adding the formulated amount of tempered luminous aggregate, tempered glass aggregate, chopped optical fiber and the remaining formulated amount of water to the second mixture, stirring evenly to obtain a third mixture; S4. Add the formulated amount of admixture into the third mixture, stir evenly, and obtain the finished luminous concrete.

10. The method for preparing luminous concrete according to claim 9, characterized in that: In step S3, while the second mixture is being stirred, luminous aggregate, tempered glass aggregate, chopped optical fiber and the remaining amount of water are added; in step S4, while the third mixture is being stirred, an admixture is added.

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