Light-transmitting decorative concrete plate as well as preparation method and application thereof

Abstract

The invention discloses a light-transmitting decorative concrete plate as well as a preparation method and application thereof. The light-transmitting decorative concrete plate comprises a concrete material layer, a glass gridding cloth layer and a light-transmitting regeneration pipe, the glass gridding cloth layer is arranged in the concrete material layer, and the light-transmitting regeneration pipe penetrates through the glass gridding cloth layer and the concrete material layer to form a light-transmitting channel. The waste plastic straws and the biomass ash can be efficiently recycled, and the waste plastic straws and the biomass ash are combined with a concrete material to prepare the concrete plate. The preparation method is environment-friendly, low in cost and easy to popularize and implement, and the prepared concrete plate is excellent in working performance, construction convenience, mechanical property and durability.

Description

Technical Field

[0001] The present invention belongs to the field of inorganic non-metallic materials, and particularly relates to a light-transmitting decorative concrete slab, a preparation method thereof, and an application thereof. Background Art

[0002] Among the output of plastic products, plastic straws account for a large part, and the number of straws used per capita per year is relatively large. While plastic products provide convenience, they also bring environmental pollution problems. Due to the complex material and shape types of plastic straws, the recycling cost may be higher than the value of recycled materials, making recycling economically unfeasible.

[0003] Biomass ash, as a product of biomass combustion, has been partially applied in cement-based materials. However, since biomass ash contains a relatively high proportion of alkaline components, such as inorganic substances like calcium and potassium, if combined with aggregates containing more active mineral components (such as quartz sand commonly used in high-performance concrete), it may trigger significant alkali-aggregate reactions, thus affecting the performance of concrete. In addition, there may be a small amount of organic matter remaining in biomass ash. After decomposition in concrete, these organic matters will not only form more pores, but their pigment components may also cause color changes in concrete, restricting the further application of biomass ash in decorative concrete. These factors jointly restrict the wide application of biomass ash in the field of concrete.

[0004] With the development of fiber cement products, more and more types of fibers have been applied to concrete. However, traditional fibers (such as glass fibers, asbestos fibers, and plastic fibers) face pollution and health problems. A large amount of polluting gases are generated during the production of plastic fibers. At the same time, due to their easy floating and difficult degradation, they may cause damage when in contact with the skin and affect the respiratory system after inhalation. In particular, once asbestos fibers are inhaled into the human body, they will cause serious health problems such as pulmonary fibrosis. Steel fibers are not very suitable for large-scale application in decorative concrete due to their high cost and easy rusting problems. Although plant fibers are an environmentally friendly material, they have a natural porous structure and are easily corroded in an alkaline environment, so their application in concrete is relatively less. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a light-transmitting decorative concrete slab, a preparation method thereof, and an application thereof. The present invention provides an effective method for recycling waste plastic straws and biomass ash. By preparing them into concrete slabs, it is not only environmentally friendly and low-cost, but also convenient for popularization and application.

[0006] The purpose of the present invention is achieved through the following technical solutions: A light-transmitting decorative concrete slab, comprising a concrete material layer, a glass fiber mesh layer and light-transmitting recycled tubes. The glass fiber mesh layer is arranged inside the concrete material layer, and the light-transmitting recycled tubes penetrate through the glass fiber mesh layer and the concrete material layer to form light-transmitting channels; The concrete material layer is prepared from components including the following parts by mass: white cement, white silica fume, modified biomass ash, expansion component, white quartz sand, defoaming agent, water reducing agent, boric acid, water and modified white plant fiber; The modified biomass ash is made by mixing enzymatically bleached biomass ash and heavy calcium carbonate; The modified white plant fiber is obtained by soaking plant fiber in alkali solution and then spraying sodium silicate solution on the surface; The light-transmitting recycled tube is formed by coarsening a plastic straw and then injecting light-transmitting resin and curing it.

[0007] Preferably, the concrete material layer is prepared from components including the following parts by mass: 750 - 850 parts of white cement, 130 - 160 parts of white silica fume, 80 - 100 parts of modified biomass ash, 100 - 200 parts of expansion component, 1000 - 1100 parts of white quartz sand, 1 - 1.5 parts of defoaming agent, 8 - 12 parts of water reducing agent, 0.5 - 1 part of boric acid, 200 - 220 parts of water and 30 - 40 parts of modified white plant fiber.

[0008] Preferably, the concrete material layer is prepared from components including the following parts by mass: 750 - 850 parts of white cement, 130 - 160 parts of white silica fume, 80 - 100 parts of modified biomass ash, 150 parts of expansion component, 1050 parts of white quartz sand, 1.2 parts of defoaming agent, 8 - 12 parts of water reducing agent, 0.8 part of boric acid, 210 parts of water and 30 parts of modified white plant fiber.

[0009] Preferably, the concrete material layer further comprises 15 - 25 parts of color powder. More preferably, the color powder is a metal oxide pigment with a mesh number not exceeding 300.

[0010] Preferably, the plastic straw is an abandoned plastic straw.

[0011] Preferably, the expansion component is obtained by mixing components including the following parts by mass: 40 - 50 parts of sulfoaluminate cement, 80 - 100 parts of gypsum and 40 - 50 parts of magnesium oxide.

[0012] Preferably, the glass fiber mesh layer is an alkali-resistant glass fiber mesh with a surface density of 90 - 110 g / m 2 ².

[0013] Preferably, the grade of the sulfoaluminate cement is 62.5.

[0014] Preferably, the gypsum is anhydrous gypsum with a mesh number of 325.

[0015] Preferably, the magnesium oxide is slow-type magnesium oxide.

[0016] Preferably, the white cement is PW52.5 white cement with a whiteness > 85%.

[0017] Preferably, the 28-day activity of the white silica fume is > 100% and the whiteness is > 85%.

[0018] Preferably, the mesh number of the white quartz sand is 70 - 100.

[0019] Preferably, the purity of boric acid is > 99%.

[0020] Preferably, the defoaming agent is silicone defoaming agent or polyether defoaming agent; the water reducing agent is polyether defoaming agent with a water reduction rate ≥ 25%.

[0021] The preparation method of the above light-transmitting decorative concrete slab includes the following steps: Prepare modified biomass ash, modified white plant fiber and light-transmitting recycled tube respectively; Fix the light-transmitting recycled tube to the bottom mold of the mold according to the pattern requirements; mix white cement, white silica fume, modified biomass ash, expansion component, white quartz sand, defoaming agent, water reducing agent and boric acid evenly, then add water and modified white plant fiber, and stir evenly to obtain a slurry; First pour part of the slurry into the mold, vibrate it, lay a glass grid cloth parallel to the bottom mold, then pour the remaining slurry and vibrate it, after film curing, polish it until the light-transmitting recycled tube is completely exposed; After steam curing and demolding the polished sample, the light-transmitting decorative concrete slab is obtained.

[0022] Preferably, the time of film curing is 1 - 2 d, the temperature is 20 - 25 °C, and the humidity is 60 - 90%; the time of steam curing is 3 d and the temperature of steam curing is 100 °C.

[0023] Preferably, the preparation method of the light-transmitting decorative concrete slab further includes quality inspection of the demolded sample. For those with surface defects, repair them with resin and spray a protective agent on the surface.

[0024] Preferably, the resin is PETG; the protective agent is an oil-based protective agent or a water-based protective agent. More preferably, the protective agent is water-based acrylic acid.

[0025] Preferably, the modified biomass ash is prepared according to the following method: (1) Grind the crop fuel biomass ash and mix it evenly with water to obtain a suspension; (2) Continuously introduce CO2 into the suspension under stirring conditions, stop stirring and gas introduction after 48 - 60 h, let it stand, take the precipitate and dry it to obtain the precipitate dry powder; (3) Prepare a mixed solution of xylanase and lignin-degrading enzyme with a concentration of 40-50 mg / L, adjust the pH of the mixed solution to 4-7 and the temperature to 40-60 °C, add the dry powder of the precipitate, filter after shaking to obtain a solid, wash the solid with water and then air-dry it, and finally mix it with heavy calcium carbonate to obtain the modified biomass ash.

[0026] Preferably, the crop fuel biomass ash is ground and sieved through a 200-325 mesh sieve, and the undersize is reserved for use.

[0027] Preferably, the crop fuel biomass ash is ground and mixed evenly with water in a mass ratio of 2:8.

[0028] Preferably, CO2 is introduced into the suspension at a rate of 1-3 L / min.

[0029] Preferably, the mass ratio of xylanase to lignin-degrading enzyme is 4:1.

[0030] Preferably, the solid obtained after air-drying is mixed with heavy calcium carbonate in a mass ratio of 9:1.

[0031] Preferably, the precipitate is taken and dried after standing for 2-3 h.

[0032] Preferably, the precipitate is dried at 100-120 °C for 12 h to obtain the dry powder of the precipitate.

[0033] Preferably, the pH of the mixed solution is adjusted by adding an acetic acid buffer solution with a pH of 5.5 to adjust the solution pH.

[0034] Preferably, the parameters of the shaking are: the shaking frequency is 120-180 rpm and the amplitude is 2-3 cm.

[0035] Preferably, the modified white plant fiber is prepared according to the following method: First, soak the plant fiber in an alkaline solution with a concentration of 1-1.5%, then take out the soaked sample and wash it, let it stand in water and then take it out and dry the surface, and finally spray a sodium silicate solution with a concentration of 1.8-2.2% on the surface of the sample.

[0036] Preferably, the length of the plant fiber is 12-14 mm.

[0037] Preferably, the plant fiber is white cotton and linen fiber.

[0038] Preferably, the alkaline solution is a mixture composed of NaOH solution and Na2SiO3 solution, wherein the mass ratio of NaOH to Na2SiO3 is 3:4.

[0039] Preferably, the spraying parameters are as follows: the spraying pressure is 0.3 - 0.4 MPa, the nozzle diameter is 0.8 mm, the spraying distance is 25 - 35 cm, the spraying time is 20 s, and the solution flow rate is 100 mL / min.

[0040] Preferably, the light-transmitting regenerating tube is prepared as follows: after roughening the inner and outer surfaces of a plastic straw respectively, the roughened sample is first cleaned and dried, then a light-transmitting resin is injected into the lumen, and finally it is cured at 40 - 60 °C for 24 h.

[0041] Preferably, the plastic straw is an abandoned plastic straw.

[0042] Preferably, the specific operations for roughening the inner and outer surfaces of the plastic straw are as follows: the inner and outer surfaces of the plastic straw are treated by sandblasting for 2 s and 3 - 5 s respectively. Among them, the abrasive for sandblasting is ceramic sand with a particle size of 0.025 - 0.065 mm, the sandblasting pressure is 0.2 - 0.5 Mpa, the gun nozzle diameter is 0.5 - 1 mm, and the sandblasting distance is 20 - 30 cm.

[0043] The application of the above light-transmitting decorative concrete slab in building exterior walls, interior decoration, and landscape design.

[0044] The reaction process or principle involved in the present invention: After being treated with a surface alkaline solution, the surface of the plant fiber becomes rough, thereby enhancing the bonding force between the fiber and the concrete. After being modified with sodium silicate, on the one hand, the sodium silicate solution dehydrates and condenses after drying to form a composite layer of amorphous silica (SiO2) and silicic acid gel (Si(OH)4), which wraps around the surface of the plant fiber. This dense composite layer can significantly reduce the water absorption of the fiber and reduce the internal stress cracking caused by water absorption and expansion in the concrete. On the other hand, the sodium silicate solution penetrates into the internal pores of the fiber and fills these voids to form a silicate network after curing, thereby improving, for example, the density and tensile strength of the fiber itself and reducing the fracture tendency of the fiber in the concrete. This not only ensures that the fiber is not prone to react with the matrix and improves its durability, but also because the silica on the surface will react with the cement matrix, making the fiber bind more tightly to the matrix. In addition, the porous structure of the fiber itself can also play a certain role in internal curing, helping to enhance the overall performance of the material.

[0045] Adding a layer of fiberglass mesh in the board can effectively compensate for the problem of insufficient toughness of the plant fiber. The fiberglass mesh selected in the present invention has a relatively small surface density and a relatively large hollow area, which not only ensures the overall strength of the board but also can endow a light-transmitting space to a great extent.

[0046] The present invention uses the method of adding water and mixing to remove the grease and carbon on the surface of biomass ash through density difference. The principle is as follows: Since the density of grease and carbon particles is relatively low, after mixing them with water, these substances will float on the water surface, thereby reducing the organic residues in the sediment. Subsequently, the biomass ash is subjected to biological bleaching treatment, which is achieved by decomposing lignocellulose. Specifically, lignocellulose is not only a carrier of pigments but also plays a protective role for pigments; decomposing lignocellulose can promote the release of pigments, thereby achieving a bleaching effect. In addition, the reduction of the organic matter content can effectively improve the strength of the board. Finally, the treated biomass ash is mixed with white heavy calcium powder to enhance the whiteness, which not only simplifies the board color adjustment process but also significantly improves the coloring uniformity.

[0047] Since biomass ash is the ash produced during the high-temperature combustion of biomass fuel, the calcium, potassium, magnesium and other oxides contained in it will produce strong alkalinity after dissolving in water. The quartz sand used in the present invention contains a relatively high content of reactive silica, which will thus trigger an alkali-aggregate reaction. However, in the method of the present invention, the calcium, potassium, magnesium and other oxides in the biomass ash can react with CO2 in the suspension to form corresponding metal carbonates. Among them, calcium carbonate and magnesium carbonate have relatively low solubility and weak alkalinity, and finally form precipitates; while potassium carbonate with relatively high solubility remains strongly alkaline and dissolves in the suspension. Therefore, after being treated by this method, the alkalinity of the obtained precipitate is significantly reduced. To sum up, introducing CO2 into the suspension can not only form metal carbonates through the reaction with metal oxides to achieve the effect of carbon fixation, but also effectively reduce the alkaline components in the biomass ash.

[0048] Due to the characteristics of the material and manufacturing process, the recycling of waste plastic straws is relatively difficult. The present invention uses the method of sandblasting roughening to perform surface roughening treatment on waste plastic straws, so that good roughness is obtained on both the inner and outer surfaces, and at the same time, the surface dirt is removed. This not only enhances the adhesion of the plastic straw in the concrete, but also enables the light-transmitting resin to be closely combined with the straw. After injecting the light-transmitting resin, not only the rigidity of the overall structure can be improved, but also the plastic straw can serve as a protective layer to protect the light-transmitting resin in an alkaline environment, thereby enhancing its durability. In this way, the effective reuse of waste plastic straws is realized.

[0049] Compared with the prior art, the beneficial effects of the present invention include: (1) The present invention uses plant fibers to replace PP, PE and glass fibers in traditional slurries. Compared with the environmental pollution and relatively high cost caused by traditional fibers during production and use, plant fibers can not only effectively ensure the anti-cracking performance of concrete, but also significantly reduce environmental pollution.

[0050] (2) The present invention uses waste plastic straws. After roughening the inner and outer surfaces thereof, a light-transmitting resin is injected into the plastic straws, thereby forming a light path in the concrete slab. Compared with the light path formed by using optical fibers, this method not only effectively reduces the cost, but also realizes the utilization of waste. Description of the Drawings

[0051] Figure 1 It is a schematic structural view of the light-transmitting decorative concrete slab prepared in the embodiment of the present invention before demolding. Among them, 1 - mold, 2 - light-transmitting recycled pipe, 3 - concrete material layer, 4 - glass fiber cloth layer. Specific Embodiments

[0052] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0053] The sources, characterization parameters and preparation processes of the materials used in the following examples and comparative examples are as follows: The modified biomass ash is prepared according to the following method: (1) Grind the rice husk ash and pass it through a 200-mesh sieve, and take the sifted material; (2) Stir and mix the sifted material and water according to a mass ratio of 2:8, the stirring rate is 540 - 660 r / min, and the stirring time is 5 min to obtain a suspension; (3) At a stirring rate of 360 - 440 r / min, introduce CO2 into the suspension at a rate of 1 - 3 L / min and continue for 48 - 60 h, then stop stirring and aeration, let it stand for 3 h and then take out the precipitate. The precipitate is dried at 100 - 120 °C for 12 h to obtain a dry precipitate powder; (4) Prepare a mixed solution of xylanase and lignin-degrading enzyme (specifically laccase) with a concentration of 50 mg / L, wherein the mass ratio of xylanase to lignin-degrading enzyme is 4:1; adjust the pH of the mixed solution to 4 - 7 and the temperature to 40 - 60 °C, add the dry precipitate powder obtained in step (3) into the mixed solution, oscillate for 24 h and then filter to obtain a solid. The solid is washed with water and then air-dried at 75 °C; wherein, the oscillation frequency of the oscillation is 120 - 180 rpm and the amplitude is 2 - 3 cm; (5) Mix the solid obtained after air-drying in step (4) with heavy calcium carbonate according to a mass ratio of 9:1 to obtain the modified biomass ash.

[0054] The modified white plant fiber is prepared as follows: First, white cotton and linen fibers with a length of 12 - 14 mm are soaked in a 1% NaOH solution for 24 h. Then, the soaked samples are taken out and washed, left standing in water for 6 h, and then taken out and dried on the surface. Finally, a 2% sodium silicate solution is sprayed on the surface of the samples.

[0055] The light-transmitting regenerated tube is prepared as follows: First, waste plastic straws are cleaned. Then, the inner and outer surfaces of the plastic straws are treated by sandblasting for 2 s and 3 - 5 s respectively. Among them, the abrasive for sandblasting is ceramic sand with a particle size of 0.025 - 0.065 mm, the sandblasting pressure is 0.2 - 0.5 Mpa, the spray gun orifice diameter is 0.5 - 1 mm, and the sandblasting distance is 20 - 30 cm. After roughening treatment, the surface of the sample is cleaned and air-dried at room temperature. Finally, a light-transmitting resin (specifically PETG) is injected into the air-dried plastic straw, and it is cured at 40 - 60 °C for 24 h.

[0056] The expansion component is obtained by mixing the following components in parts by mass: 45 parts of sulfoaluminate cement, 90 parts of gypsum, and 45 parts of slow-type magnesium oxide (purchased from Wuhan Sanyuan Special Building Materials Co., Ltd.).

[0057] The glass fiber grid cloth layer uses alkali-resistant glass fiber grid cloth with a surface density of 100 g / m 2 (purchased from Taishan Fiberglass Co., Ltd.).

[0058] The defoaming agent is a polyether high-performance powder defoaming agent produced by Suzhou Xingbang Chemical Building Materials Co., Ltd., the water-reducing agent is a polycarboxylate water-reducing agent produced by Huaxin Xijiesi Building Materials Technology (Changsha) Co., Ltd., and the color powder is titanium dioxide powder.

[0059] The optical fiber is a transparent resin composite optical fiber produced by Guangzhou Guheng Building Materials Technology Co., Ltd.

[0060] Example 1 A light-transmitting decorative concrete slab is prepared from the following components in parts by mass: 750 parts of white cement, 160 parts of white silica fume, 80 parts of modified biomass ash, 20 parts of color powder, 150 parts of expansion component, 1050 parts of white quartz sand, 1.2 parts of defoaming agent, 12 parts of water-reducing agent, 210 parts of water, 30 parts of modified white plant fiber, 0.8 part of boric acid, and 35 parts of light-transmitting regenerated tube.

[0061] The preparation method of the above light-transmitting decorative concrete slab is as follows: S1. Fix the light-transmitting regenerative tube to the bottom mold of the mold according to the pattern requirements; mix white cement, white silica fume, modified biomass ash, expansion component, white quartz sand, color powder, defoamer, water reducer and boric acid evenly, then add water and modified white plant fiber, and stir for 8 min to mix evenly to obtain a slurry. S2. First, pour half of the slurry into the mold, vibrate the whole for 10 - 20 s, then place the glass fiber cloth parallel to the bottom mold and completely cover the surface of the slurry to form a glass fiber cloth layer. Then pour the remaining half of the slurry into the mold and vibrate for 10 - 20 s. After the vibration ends, cure it with a film for 1 - 2 d, and then polish the film-covered plane until the light-transmitting regenerative tube is completely exposed. S3. Steam-cure the polished sample for 3 d and then demold it. Repair the defects on the surface with resin (specifically PETG), and spray a protective agent (specifically waterborne acrylic) on the surface to obtain the light-transmitting decorative concrete board.

[0062] Example 2 A light-transmitting decorative concrete board is prepared from the following components in parts by mass: 800 parts of white cement, 130 parts of white silica fume, 100 parts of modified biomass ash, 20 parts of color powder, 150 parts of expansion component, 1050 parts of white quartz sand, 1.2 parts of defoamer, 8 parts of water reducer, 210 parts of water, 30 parts of modified white plant fiber, 0.8 part of boric acid and 35 parts of light-transmitting regenerative tube.

[0063] The preparation method of the above light-transmitting decorative concrete board is the same as that of Example 1.

[0064] Example 3 A light-transmitting decorative concrete board is prepared from the following components in parts by mass: 850 parts of white cement, 145 parts of white silica fume, 90 parts of modified biomass ash, 20 parts of color powder, 150 parts of expansion component, 1050 parts of white quartz sand, 1.2 parts of defoamer, 10 parts of water reducer, 210 parts of water, 30 parts of modified white plant fiber, 0.8 part of boric acid and 35 parts of light-transmitting regenerative tube.

[0065] The preparation method of the above light-transmitting decorative concrete board is the same as that of Example 1.

[0066] Comparative Example 1 A light-transmitting decorative concrete board is prepared from the following components in parts by mass: 850 parts of white cement, 145 parts of white silica fume, 90 parts of limestone powder, 20 parts of color powder, 150 parts of expansion component, 1050 parts of white quartz sand, 1.2 parts of defoamer, 10 parts of water reducer, 210 parts of water, 30 parts of modified white plant fiber, 0.8 part of boric acid and 35 parts of light-transmitting regenerative tube.

[0067] The preparation method of the light-transmitting decorative concrete slab described in Comparative Example 1 is the same as that in Example 3, with the difference that the "modified biomass ash" in Example 3 is replaced by "limestone powder".

[0068] Comparative Example 2 A light-transmitting decorative concrete slab is prepared from the following components in parts by mass: 850 parts of white cement, 145 parts of white silica fume, 90 parts of modified biomass ash, 20 parts of color powder, 150 parts of expansion component, 1050 parts of white quartz sand, 1.2 parts of defoaming agent, 10 parts of water reducing agent, 210 parts of water, 30 parts of PP fiber, 0.8 part of boric acid, and 35 parts of light-transmitting recycled pipe.

[0069] The preparation method of the light-transmitting decorative concrete slab described in Comparative Example 2 is the same as that in Example 3, with the difference that the "modified white plant fiber" in Example 3 is replaced by "PP fiber".

[0070] Comparative Example 3 A light-transmitting decorative concrete slab is prepared from the following components in parts by mass: 850 parts of white cement, 145 parts of white silica fume, 90 parts of limestone powder, 20 parts of color powder, 150 parts of expansion component, 1050 parts of white quartz sand, 1.2 parts of defoaming agent, 10 parts of water reducing agent, 210 parts of water, 30 parts of white plant fiber, 0.8 part of boric acid, and 35 parts of light-transmitting recycled pipe.

[0071] The preparation method of the light-transmitting decorative concrete slab described in Comparative Example 3 is the same as that in Example 3, with the difference that the "modified white plant fiber" in Example 3 is replaced by "white plant fiber".

[0072] Comparative Example 4 A light-transmitting decorative concrete slab is prepared from the following components in parts by mass: 850 parts of white cement, 145 parts of white silica fume, 90 parts of limestone powder, 20 parts of color powder, 150 parts of expansion component, 1050 parts of white quartz sand, 1.2 parts of defoaming agent, 10 parts of water reducing agent, 210 parts of water, 30 parts of modified white plant fiber, 0.8 part of boric acid, and 35 parts of optical fiber.

[0073] The preparation method of the light-transmitting decorative concrete slab described in Comparative Example 4 is the same as that in Example 3, with the difference that the "light-transmitting recycled pipe" in Example 3 is replaced by "optical fiber".

[0074] Performance test: The plate samples required for the test were prepared from Experimental Examples 1 to 3 and Comparative Examples 1 to 4, and the light-transmitting area and position of all samples were ensured to be consistent (the specific implementation method was: replacing the light-transmitting regenerated tube with the same volume of optical fiber in the comparative example). According to the national standards GBT 35160.1 "Test Methods for Synthetic Stone - Part 1: Determination of Density and Water Absorption", GBT 35160.2 "Test Methods for Synthetic Stone - Part 2: Compressive Strength Test", and GBT 160.3 "Test Methods for Synthetic Stone - Part 3", the water absorption, compressive strength, and flexural strength of the above plates were tested, and the test data are shown in Table 1.

[0075] The fluidity of the slurries prepared from Examples 1 to 3 and Comparative Examples 1 to 4 was tested (the reference standard was GB / T50448-2015 "Technical Specification for Application of Cementitious Grouting Materials"), and the 28-day cube compressive strength (the reference standard was GB / T 31387 "Ultra-High Performance Concrete") and frost resistance (the reference standard was GB / T 50733-2011 "Test Code for Frost Resistance of Concrete") of the formed test blocks were tested. The test data are shown in Table 2.

[0076] Table 1 Test Results of Plates Made from Examples and Comparative Examples

[0077] Table 2 Fluidity, Compressive Strength, and Durability Results of Concrete Slurries Prepared from Examples and Comparative Examples

[0078] Referring to Tables 1 and 2, by comparing Example 3 and Comparative Example 1, it can be seen that the compressive strength of the plate made of the modified biomass ash of the present invention is higher than that of the plate made of limestone powder. Specifically, the compressive strength of the plate of the present invention is increased by 8.7% compared with Comparative Example 1. This proves that the material made by mixing the biomass ash treated by enzymatic hydrolysis and bleaching with heavy calcium carbonate can effectively enhance the compressive strength of the plate.

[0079] By comparing Example 3 and Comparative Example 2, it can be seen that the plate made of the modified white plant fiber prepared by the present invention can be comparable to the conventional PP fiber plate in terms of compressive strength. In addition, the modified white plant fiber of the present invention is more easily degradable than PP fiber and is green and environmentally friendly.

[0080] By comparing Example 3 and Comparative Example 3, it can be seen that the board made of modified white plant fiber has a significant improvement in compressive strength compared to the unmodified white plant fiber board. Specifically, the compressive strength of the former is increased by 11.2% compared to the latter. At the same time, the water absorption rate of the former is also lower than that of the latter. Correspondingly, the compressive strength of the concrete slurry using this modified fiber increases from 108.5 MPa to 111.2 MPa after 28 days. This proves that the method of modifying by alkali solution soaking treatment and surface spraying of sodium silicate solution can not only significantly improve the compressive strength of the board and the compressive strength of the concrete slurry, but also reduce the water absorption rate of the board to a certain extent.

[0081] By comparing Example 3 and Comparative Example 4, it can be seen that the board prepared using the light-transmitting recycled pipe of the present invention has comparable performance in compressive strength to the board prepared using optical fiber. Correspondingly, the compressive strengths of the concrete slurries corresponding to these two materials are also similar after 28 days. This proves that the light-transmitting recycled pipe of the present invention can achieve similar effects to optical fiber, but its cost is significantly lower than that of optical fiber. Therefore, the present invention has significant economic advantages.

[0082] Figure 1 It is a schematic structural diagram of the light-transmitting decorative concrete board prepared in the embodiment of the present invention before demolding. Combining Figure 1 , we can more clearly understand the preparation process of the concrete board: First, a light-transmitting recycled pipe 2 is arranged at the bottom of the mold, and then part of the slurry is injected to form a part of the concrete material layer 3. When half of the slurry is injected into the mold, the fiberglass mesh is placed parallel to the bottom mold and completely covers the surface of the slurry to form a fiberglass mesh layer 4. Subsequently, the remaining slurry is poured into the mold to form the remaining part of the concrete material layer 3. Finally, the light-transmitting decorative concrete board can be prepared after curing.

[0083] The above specific embodiments of the present invention do not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A light-transmitting decorative concrete slab, characterized in that, It includes a concrete material layer, a glass fiber mesh layer, and a light-transmitting recycled pipe. The glass fiber mesh layer is arranged inside the concrete material layer, and the light-transmitting recycled pipe penetrates through the glass fiber mesh layer and the concrete material layer to form a light-transmitting channel; The concrete material layer is prepared from components including the following parts by mass: white cement, white silica fume, modified biomass ash, expansion component, white quartz sand, defoamer, water reducer, boric acid, water, and modified white plant fiber; The modified biomass ash is made by mixing enzymatically bleached biomass ash and heavy calcium carbonate; The modified white plant fiber is obtained by soaking plant fiber in alkali solution and then spraying sodium silicate solution on the surface; The light-transmitting recycled pipe is formed by coarsening a plastic straw and then injecting light-transmitting resin and curing it; 2. The light-transmitting decorative concrete slab according to claim 1, wherein The concrete material layer is prepared from components including the following parts by mass: 750 - 850 parts of white cement, 130 - 160 parts of white silica fume, 80 - 100 parts of modified biomass ash, 100 - 200 parts of expansion component, 1000 - 1100 parts of white quartz sand, 1 - 1.5 parts of defoamer, 8 - 12 parts of water reducer, 0.5 - 1 part of boric acid, 200 - 220 parts of water, and 30 - 40 parts of modified white plant fiber; 3. The light-transmitting decorative concrete slab according to claim 2, wherein The plastic straw is selected as a waste plastic straw; The expansion component is obtained by mixing components including the following parts by mass: 40 - 50 parts of sulfoaluminate cement, 80 - 100 parts of gypsum, and 40 - 50 parts of magnesium oxide; The glass fiber mesh layer has a surface density of 90~110 g / m 2 ; alkali-resistant fiberglass mesh cloth.

4. The preparation method of the light-transmitting decorative concrete slab according to any one of claims 1 to 3, characterized in that, It includes the following steps: Prepare modified biomass ash, modified white plant fiber, and light-transmitting recycled pipe respectively; Fix the light-transmitting recycled pipe to the bottom mold of the mold according to the pattern requirements; mix white cement, white silica fume, modified biomass ash, expansion component, white quartz sand, defoamer, water reducer, and boric acid evenly, then add water and modified white plant fiber, and stir evenly to obtain a slurry; First pour part of the slurry into the mold, vibrate it, lay a glass fiber mesh parallel to the bottom mold, then pour the remaining slurry and vibrate it, after film curing, grind it until the light-transmitting recycled pipe is completely exposed; After steam curing the polished sample, demold it to obtain the light-transmitting decorative concrete slab.

5. The preparation method of the light-transmitting decorative concrete slab according to claim 4, characterized in that, The time of the film curing is 1 - 2 d, the temperature is 20 - 25 °C, and the humidity is 60 - 90%; The time of the steam curing is 3 d, and the temperature of the steam curing is 100 °C.

6. The preparation method of the light-transmitting decorative concrete slab according to claim 4, characterized in that, The modified biomass ash is prepared according to the following method: (1) Grind crop fuel biomass ash and mix it evenly with water to obtain a suspension; (2) Continuously introduce CO2 into the suspension under stirring, stop stirring and ventilation after 48 - 60 h, let it stand, take the precipitate and dry it to obtain a precipitate dry powder; (3) Prepare a mixed solution of xylanase and lignin-degrading enzyme with a concentration of 40 - 50 mg / L, adjust the pH of the mixed solution to 4 - 7 and the temperature to 40 - 60 °C, add the precipitate dry powder, filter after oscillation to obtain a solid, wash the solid with water and air-dry it, and finally mix it with heavy calcium carbonate to obtain the modified biomass ash.

7. The preparation method of the light-transmitting decorative concrete slab according to claim 6, wherein, Grind crop fuel biomass ash and mix it evenly with water at a mass ratio of 2:8; The CO2 is introduced into the suspension at a rate of 1 - 3 L / min; The mass ratio of the xylanase to the lignin-degrading enzyme is 4:1; The solid obtained after air drying is mixed with heavy calcium carbonate according to a mass ratio of 9:

1.

8. The preparation method of the light-transmitting decorative concrete slab according to claim 4, wherein, The modified white plant fiber is prepared according to the following method: First, soak the plant fiber in an alkaline solution with a concentration of 1-1.5%, then take out the soaked sample, wash it, let it stand in water, take it out and dry the surface, and finally spray a sodium silicate solution with a concentration of 1.8-2.2% on the surface of the sample.

9. The preparation method of the light-transmitting decorative concrete slab according to claim 4, wherein, The light-transmitting regenerated tube is prepared according to the following method: After roughening the inner and outer surfaces of the plastic straw respectively, wash and dry the roughened sample, then inject light-transmitting resin into the lumen of the tube, and finally cure it at 40-60°C for 24 hours.

10. Application of the light-transmitting decorative concrete slab according to any one of claims 1 to 3 in building exterior walls, interior decoration and landscape design.

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