Preparation method of prefabricated new type UHPC decorative hanging plate and application thereof

Abstract

The application provides a preparation method of prefabricated new UHPC decorative hanging plate and application thereof, and belongs to the technical field of super high performance concrete products, and the preparation method comprises the following steps: S1, uniformly mixing cement 60-65 parts, modified perlite composite powder 4-6 parts, gravel 4-6 parts, natural sand 25-30 parts, water reducing agent 1.4-1.8 parts, defoaming agent 0.08-0.1 parts and water 17-22 parts according to weight parts, to obtain initial mixture; S2, putting steel wire short fibers 2-3 parts and styrene liquid core glass fibers 3-4 parts into the initial mixture obtained in S1 according to weight parts, uniformly mixing, to obtain UHPC material; S3, vibrating and pouring the UHPC material, vibrating for 26-30s at the same position, standard curing molding, after curing, demolding, and the prefabricated new UHPC decorative hanging plate is obtained. The application improves the frost resistance of the concrete while ensuring excellent crack resistance, and ensures that the prefabricated new UHPC decorative hanging plate can maintain excellent decorative effect for a longer time.

Description

Technical Field

[0001] This invention belongs to the field of ultra-high performance concrete products technology, specifically relating to a method for preparing a new type of prefabricated UHPC decorative panel and its application. Background Technology

[0002] From an architectural perspective, exterior wall cladding is a construction method where panels are suspended from the exterior of a wall using methods such as dry hanging to achieve decorative or insulating effects; hence, it is also called decorative cladding. From a product perspective, exterior wall cladding is a type of building material, specifically building panels used for exterior walls. Exterior wall cladding must possess basic properties such as corrosion resistance, high temperature resistance, aging resistance, radiation-free operation, fire resistance, insect resistance, and non-deformation. It also requires aesthetic appeal, ease of installation, and environmental friendliness and energy efficiency. Common exterior wall cladding materials include fiber cement board, aluminum composite panel, PVC board, and stone.

[0003] Due to its fire resistance, corrosion resistance, thermal insulation, aging resistance, and lack of radiation, as well as its low cost, energy efficiency, environmental friendliness, and ease of construction, coupled with its ease of carving and ability to create a simple and natural architectural style, fiber cement board has begun to be used in some national-level projects. With societal progress, fiber cement exterior wall cladding will be increasingly used in various building walls, becoming a mainstream construction material, similar to its use abroad.

[0004] Fiber cement boards are suspended on the outside of walls, exposed to wind and sun, and in cold regions, they also have to withstand freezing temperatures. To achieve excellent decorative effects, they need to possess superior compressive strength, flexural strength, crack resistance, and frost resistance. Only with excellent overall performance can they be more durable and maintain their superior decorative effect for a longer period.

[0005] However, in the existing technology, in order to improve the frost resistance of fiber cement boards, antifreeze agents are often added. However, the addition of antifreeze agents will affect the crack resistance of concrete by changing the air content of concrete and the use of early strength agents, resulting in a decrease in the crack resistance of concrete products and a negative impact on the overall performance. Summary of the Invention

[0006] To address the problems existing in the background technology, the present invention provides a method for preparing a new type of prefabricated UHPC decorative panel and its application, which improves the frost resistance while ensuring excellent crack resistance, and ensures that the excellent decorative effect is maintained for a longer period of time.

[0007] To achieve the above objectives, in a first aspect, the present invention provides the following technical solution:

[0008] A method for preparing a novel prefabricated UHPC decorative panel includes the following steps:

[0009] S1. By weight, mix 60-65 parts of cement, 4-6 parts of modified perlite composite powder, 4-6 parts of crushed stone, 25-30 parts of natural sand, 1.4-1.8 parts of water-reducing agent, 0.08-0.1 parts of defoamer and 17-22 parts of water to obtain the initial mixture.

[0010] S2. By weight, add 2-3 parts of short steel wire fibers and 3-4 parts of styrene liquid-core glass fibers to the initial mixture obtained in S1, mix well, and obtain UHPC material.

[0011] S3. Vibrate and pour the UHPC material, vibrating for 26-30 seconds at the same location. Curing is then performed according to standard. After curing, the mold is removed to obtain the prefabricated new UHPC decorative panel.

[0012] Furthermore, the preparation method of the modified perlite composite powder is as follows:

[0013] B1. Crush perlite particles to a particle size of less than 1 mm to obtain perlite powder;

[0014] B2. Mix γ-aminopropyltriethoxysilane with water to prepare an aqueous solution of γ-aminopropyltriethoxysilane with a mass concentration of 1.5%.

[0015] B3. Add the perlite powder obtained in B1 to a high-speed disperser. Under the conditions of room temperature and 8000 rpm, add the aqueous solution of γ-aminopropyltriethoxysilane obtained in B2 dropwise to the high-speed disperser. The mass of the added perlite powder is 20%. After the addition is completed, maintain the dispersion for 20 minutes and then dry to obtain activated perlite powder.

[0016] B4. Prepare a 60% aqueous solution of methyltrimethoxysilane and a 60% ethyl acetate solution of polyacrylate. Mix the two in a mass ratio of 1:1 and react for 2 hours under stirring conditions of 80°C and 60 r / min in a water bath to obtain the complex.

[0017] B5. Pour the composite obtained in B4 into a mold and perform heat curing treatment. Then grind the cured composite and pass it through a 16-mesh sieve to obtain activated methyltrimethoxysilane.

[0018] B6. Prepare a 50% polyacrylate acetone solution;

[0019] B7. Add the activated perlite powder obtained in B3 and the activated methyltrimethoxysilane obtained in B5 to the 50% polyacrylate acetone solution obtained in B6. The mass ratio of the three is 1:(0.5-0.8):(4-10). Stir at 85℃ and 250r / min for 2h to obtain the composite material.

[0020] B8. Pour the composite material obtained in B7 into a mold and perform heat curing treatment. Then grind the cured composite material and pass it through a 16-mesh sieve to obtain modified perlite composite powder.

[0021] Furthermore, the cement comprises P.O52.5 grade ordinary Portland cement and finely ground P.O42.5 grade medium-heat cement, with a mass ratio of 4:1.

[0022] Furthermore, the water-reducing agent includes aminosulfonate high-efficiency water-reducing agents and / or polycarboxylate high-efficiency water-reducing agents.

[0023] Furthermore, the defoamer is a polyether-modified silicone defoamer.

[0024] Furthermore, the particle size of the crushed stone is 5.5-7.0 mm.

[0025] Furthermore, the particle size of the natural sand is less than 4.5 mm.

[0026] Furthermore, the short steel wire fibers have a length of 10-15 mm and a diameter of 0.2-0.5 mm.

[0027] Secondly, the present invention provides the following technical solution:

[0028] An application of a prefabricated novel UHPC decorative panel, wherein the prefabricated novel UHPC decorative panel is prepared by the above-mentioned preparation method, and the prefabricated novel UHPC decorative panel is suspended on the outside of the wall by a dry-hanging construction method to achieve decorative or heat preservation effects.

[0029] This application has the following beneficial effects:

[0030] 1. The UHPC material prepared by this invention has stable comprehensive properties (compressive strength, flexural strength, crack resistance, water permeability resistance and frost resistance), and has excellent frost resistance and crack resistance, ensuring that the prefabricated new UHPC decorative panels are more durable and can maintain excellent decorative effects for a longer period of time.

[0031] 2. Experimental verification shows that modified perlite composite powder and styrene liquid-core glass fiber, when used as raw materials, can improve the compressive strength, flexural strength, water permeability resistance and freeze-thaw resistance of UHPC materials. Furthermore, the two can have a synergistic effect in improving the above properties.

[0032] 3. In terms of improving the compressive strength, flexural strength, water permeability resistance, and freeze-thaw resistance of UHPC materials, perlite powder cannot be easily replaced by other similar powders (such as diatomaceous earth powder and light calcium carbonate powder), otherwise the improvement effect will be weakened. Furthermore, in the preparation of modified perlite composite powder, the three steps of activation treatment of perlite powder, participation of activated methyltrimethoxysilane, and re-condensation powdering process of activated perlite powder and activated methyltrimethoxysilane by polyacrylate acetone solution are all essential and have a synergistic effect, which together achieve the effect of improving the overall performance of UHPC materials. Attached Figure Description

[0033] Figure 1 This is a comparison trend diagram of the compressive strength of UHPC materials prepared in Example 1 and Comparative Examples 1-12 of the present invention;

[0034] Figure 2 This is a comparison trend diagram of the flexural strength of the UHPC materials prepared in Example 1 and Comparative Examples 1-12 of the present invention;

[0035] Figure 3 This is a comparison trend diagram of the crack resistance of UHPC materials prepared in Example 1 and Comparative Examples 1-12 of the present invention;

[0036] Figure 4 This is a comparative trend diagram of the water permeability resistance of the UHPC materials prepared in Example 1 and Comparative Examples 1-12 of the present invention;

[0037] Figure 5 This is a comparison trend diagram of the antifreeze properties of UHPC materials prepared in Example 1 and Comparative Examples 1-12 of the present invention. Detailed Implementation

[0038] The present application will be further described in detail below with reference to the embodiments.

[0039] Unless otherwise specified, the raw materials used in the embodiments and comparative examples of this application are all commercially available.

[0040] Example 1

[0041] A method for preparing a novel prefabricated UHPC decorative panel includes the following steps:

[0042] S1. By weight, mix 60 parts of cement, 4 parts of modified perlite composite powder, 4 parts of crushed stone, 25 parts of natural sand, 1.4 parts of water-reducing agent, 0.08 parts of defoamer and 17 parts of water to obtain the initial mixture.

[0043] The cement includes P.O52.5 grade ordinary Portland cement and finely ground P.O42.5 grade medium-heat cement, with a mass ratio of 4:1.

[0044] Crushed stone has a particle size of 5.5-7.0mm; it acts as a skeleton, providing the concrete with compressive strength and abrasion resistance. Natural sand has a particle size of less than 4.5mm; it can fill the gaps between the crushed stone, improving the density and stability of the concrete.

[0045] The water-reducing agent used is polycarboxylate high-efficiency water-reducing agent CC-AI, which was purchased from Shenzhen Shangdao Chemical Co., Ltd., located in Guangdong, model 001.

[0046] The defoamer used is polyether-modified silicone defoamer, purchased from Guangdong Zhonglianbang Fine Chemical Co., Ltd., produced in Dongguan, Guangdong, brand Zhonglianbang, model B-0518.

[0047] S2. By weight, add 2 parts of short steel wire fiber and 3 parts of styrene liquid-core glass fiber to the initial mixture obtained in S1, mix well, and obtain UHPC material.

[0048] The short steel wire fibers are 10-15mm in length and 0.2-0.5mm in diameter.

[0049] Styrene-core glass fiber is prepared by injecting styrene into the interior of hollow glass fibers. When the material is damaged, the styrene encased in the fiber leaks into the matrix material and interacts with the matrix material through a curing and cross-linking reaction, thereby filling and repairing the cracks.

[0050] S3. Vibrate and pour the UHPC material, with a vibration time of 26 seconds at the same location. After standard curing, remove the mold to obtain the prefabricated new UHPC decorative panel.

[0051] The preparation method of modified perlite composite powder is as follows:

[0052] B1. Crush perlite particles to a particle size of less than 1 mm to obtain perlite powder;

[0053] B2. Mix γ-aminopropyltriethoxysilane with water to prepare an aqueous solution of γ-aminopropyltriethoxysilane with a mass concentration of 1.5%.

[0054] B3. Add the perlite powder obtained in B1 to a high-speed disperser. Under the conditions of room temperature and 8000 rpm, add the aqueous solution of γ-aminopropyltriethoxysilane obtained in B2 dropwise to the high-speed disperser. The mass of the added perlite powder is 20%. After the addition is completed, maintain the dispersion for 20 minutes and then dry to obtain activated perlite powder.

[0055] B4. Prepare a 60% aqueous solution of methyltrimethoxysilane and a 60% ethyl acetate solution of polyacrylate. Mix the two in a mass ratio of 1:1 and react for 2 hours under stirring conditions of 80°C and 60 r / min in a water bath to obtain the complex.

[0056] B5. Pour the composite obtained in B4 into a mold and perform heat curing treatment. Then grind the cured composite and pass it through a 16-mesh sieve to obtain activated methyltrimethoxysilane.

[0057] B6. Prepare a 50% polyacrylate acetone solution;

[0058] B7. Add the activated perlite powder obtained in B3 and the activated methyltrimethoxysilane obtained in B5 to the 50% polyacrylate acetone solution obtained in B6. The mass ratio of the three is 1:0.5:4. Stir at 85℃ and 250r / min for 2h to obtain the composite material.

[0059] B8. Pour the composite material obtained in B7 into a mold and perform heat curing treatment. Then grind the cured composite material and pass it through a 16-mesh sieve to obtain modified perlite composite powder.

[0060] This embodiment produces a prefabricated new type of UHPC decorative panel, which is hung on the outside of the wall using a dry-hanging construction method to achieve decorative or heat insulation effects.

[0061] Example 2

[0062] The only difference between this embodiment and Embodiment 1 is that:

[0063] A method for preparing a novel prefabricated UHPC decorative panel includes the following steps:

[0064] S1. By weight, mix 60 parts of cement, 5 parts of modified perlite composite powder, 4 parts of crushed stone, 25 parts of natural sand, 1.4 parts of water-reducing agent, 0.08 parts of defoamer and 17 parts of water to obtain the initial mixture.

[0065] S2. By weight, add 2 parts of short steel wire fiber and 3 parts of styrene liquid-core glass fiber to the initial mixture obtained in S1, mix well, and obtain UHPC material.

[0066] S3. Vibrate and pour the UHPC material, with a vibration time of 26 seconds at the same location. After standard curing, remove the mold to obtain the prefabricated new UHPC decorative panel.

[0067] Example 3

[0068] The only difference between this embodiment and Embodiment 1 is that:

[0069] A method for preparing a novel prefabricated UHPC decorative panel includes the following steps:

[0070] S1. By weight, mix 60 parts of cement, 6 parts of modified perlite composite powder, 4 parts of crushed stone, 25 parts of natural sand, 1.4 parts of water-reducing agent, 0.08 parts of defoamer and 17 parts of water to obtain the initial mixture.

[0071] S2. By weight, add 2 parts of short steel wire fiber and 3 parts of styrene liquid-core glass fiber to the initial mixture obtained in S1, mix well, and obtain UHPC material.

[0072] S3. Vibrate and pour the UHPC material, with a vibration time of 26 seconds at the same location. After standard curing, remove the mold to obtain the prefabricated new UHPC decorative panel.

[0073] Example 4

[0074] The only difference between this embodiment and Embodiment 1 is that:

[0075] A method for preparing a novel prefabricated UHPC decorative panel includes the following steps:

[0076] S1. By weight, mix 65 parts of cement, 4 parts of modified perlite composite powder, 6 parts of crushed stone, 30 parts of natural sand, 1.4 parts of water-reducing agent, 0.08 parts of defoamer and 17 parts of water to obtain the initial mixture.

[0077] S2. By weight, add 3 parts of short steel wire fibers and 4 parts of styrene liquid-core glass fibers to the initial mixture obtained in S1, mix well, and obtain UHPC material.

[0078] S3. Vibrate and pour the UHPC material, with a vibration time of 26 seconds at the same location. After standard curing, remove the mold to obtain the prefabricated new UHPC decorative panel.

[0079] Example 5

[0080] The only difference between this embodiment and Embodiment 1 is that:

[0081] A method for preparing a novel prefabricated UHPC decorative panel includes the following steps:

[0082] S1. By weight, mix 63 parts of cement, 5 parts of modified perlite composite powder, 5 parts of crushed stone, 28 parts of natural sand, 1.6 parts of water-reducing agent, 0.09 parts of defoamer and 20 parts of water to obtain the initial mixture.

[0083] S2. By weight, add 2.5 parts of short steel wire fibers and 3.5 parts of styrene liquid-core glass fibers to the initial mixture obtained in S1, mix well, and obtain UHPC material.

[0084] S3. Vibrate and pour the UHPC material, with a vibration time of 26 seconds at the same location. After standard curing, remove the mold to obtain the prefabricated new UHPC decorative panel.

[0085] Example 6

[0086] The only difference between this embodiment and Embodiment 1 is that:

[0087] A method for preparing a novel prefabricated UHPC decorative panel includes the following steps:

[0088] S1. By weight, mix 65 parts of cement, 5 parts of modified perlite composite powder, 4 parts of crushed stone, 25 parts of natural sand, 1.4 parts of water-reducing agent, 0.08 parts of defoamer and 17 parts of water to obtain the initial mixture.

[0089] S2. By weight, add 3 parts of short steel wire fibers and 4 parts of styrene liquid-core glass fibers to the initial mixture obtained in S1, mix well, and obtain UHPC material.

[0090] S3. Vibrate and pour the UHPC material, vibrating for 28 seconds at the same location. Curing is then performed according to standard. After curing, the mold is removed to obtain the prefabricated new UHPC decorative panel.

[0091] Example 7

[0092] The only difference between this embodiment and Embodiment 1 is that:

[0093] A method for preparing a novel prefabricated UHPC decorative panel includes the following steps:

[0094] S1. By weight, mix 60 parts of cement, 5 parts of modified perlite composite powder, 6 parts of crushed stone, 30 parts of natural sand, 1.8 parts of water-reducing agent, 0.1 parts of defoamer and 22 parts of water to obtain the initial mixture.

[0095] S2. By weight, add 2 parts of short steel wire fiber and 3 parts of styrene liquid-core glass fiber to the initial mixture obtained in S1, mix well, and obtain UHPC material.

[0096] S3. Vibrate and pour the UHPC material, vibrating for 30 seconds at the same location. Curing is then performed according to standard. After curing, the mold is removed to obtain the prefabricated new UHPC decorative panel.

[0097] Example 8

[0098] The only difference between this embodiment and Embodiment 1 is that:

[0099] In the preparation method of modified perlite composite powder, B7, activated perlite powder obtained from B3 and activated methyltrimethoxysilane obtained from B5 are added to 50% polyacrylate acetone solution obtained from B6, with a mass ratio of 1:0.8:10. The mixture is stirred at 85℃ and 250r / min for 2h to obtain the composite material.

[0100] Example 9

[0101] The only difference between this embodiment and Embodiment 1 is that:

[0102] In the preparation method of modified perlite composite powder, B7, activated perlite powder obtained from B3 and activated methyltrimethoxysilane obtained from B5 are added to 50% polyacrylate acetone solution obtained from B6, with a mass ratio of 1:0.6:7. The mixture is stirred at 85℃ and 250r / min for 2h to obtain the composite material.

[0103] Example 10

[0104] The only difference between this embodiment and Embodiment 1 is that:

[0105] In the preparation method of modified perlite composite powder, B7, activated perlite powder obtained from B3 and activated methyltrimethoxysilane obtained from B5 are added to 50% polyacrylate acetone solution obtained from B6, with a mass ratio of 1:0.5:10. The mixture is stirred at 85℃ and 250r / min for 2h to obtain the composite material.

[0106] Example 11

[0107] The only difference between this embodiment and Embodiment 1 is that:

[0108] In the preparation method of modified perlite composite powder, B7, activated perlite powder obtained from B3 and activated methyltrimethoxysilane obtained from B5 are added to 50% polyacrylate acetone solution obtained from B6, with a mass ratio of 1:0.8:4. The mixture is stirred at 85℃ and 250r / min for 2h to obtain the composite material.

[0109] Comparative Example 1

[0110] The only difference between this comparative example and Example 1 is that the modified perlite composite powder is replaced with perlite powder.

[0111] Specifically, a method for preparing a new type of prefabricated UHPC decorative panel includes the following steps: S1, by weight, 60 parts of cement, 4 parts of perlite powder, 4 parts of crushed stone, 25 parts of natural sand, 1.4 parts of water-reducing agent, 0.08 parts of defoamer and 17 parts of water are mixed to obtain a preliminary mixture.

[0112] S2. By weight, add 2 parts of short steel wire fiber and 3 parts of styrene liquid-core glass fiber to the initial mixture obtained in S1, mix well, and obtain UHPC material.

[0113] S3. Vibrate and pour the UHPC material, with a vibration time of 26 seconds at the same location. After standard curing, remove the mold to obtain the prefabricated new UHPC decorative panel.

[0114] The preparation method of perlite powder is as follows: perlite particles are crushed to a particle size of less than 1 mm to obtain perlite powder.

[0115] Comparative Example 2

[0116] The only difference between this comparative example and Example 1 is that the modified perlite composite powder is replaced with activated perlite powder.

[0117] Specifically, a method for preparing a new type of prefabricated UHPC decorative panel includes the following steps: S1, by weight, 60 parts of cement, 4 parts of activated perlite powder, 4 parts of crushed stone, 25 parts of natural sand, 1.4 parts of water-reducing agent, 0.08 parts of defoamer and 17 parts of water are mixed to obtain a preliminary mixture.

[0118] S2. By weight, add 2 parts of short steel wire fiber and 3 parts of styrene liquid-core glass fiber to the initial mixture obtained in S1, mix well, and obtain UHPC material.

[0119] S3. Vibrate and pour the UHPC material, with a vibration time of 26 seconds at the same location. After standard curing, remove the mold to obtain the prefabricated new UHPC decorative panel.

[0120] The preparation method of activated perlite powder is as follows:

[0121] B1. Crush perlite particles to a particle size of less than 1 mm to obtain perlite powder;

[0122] B2. Mix γ-aminopropyltriethoxysilane with water to prepare an aqueous solution of γ-aminopropyltriethoxysilane with a mass concentration of 1.5%.

[0123] B3. Add the perlite powder obtained in B1 to a high-speed disperser. Under the conditions of room temperature and 8000 rpm, add the aqueous solution of γ-aminopropyltriethoxysilane obtained in B2 dropwise to the high-speed disperser. The mass of the added perlite powder is 20%. After the addition is completed, maintain dispersion for 20 minutes and then dry to obtain activated perlite powder.

[0124] Comparative Example 3

[0125] The only difference between this comparative example and Example 1 is that 50% of the polyacrylate acetone solution was removed in the preparation of the modified perlite composite powder.

[0126] Specifically, the preparation method of modified perlite composite powder is as follows:

[0127] B1. Crush perlite particles to a particle size of less than 1 mm to obtain perlite powder;

[0128] B2. Mix γ-aminopropyltriethoxysilane with water to prepare an aqueous solution of γ-aminopropyltriethoxysilane with a mass concentration of 1.5%.

[0129] B3. Add the perlite powder obtained in B1 to a high-speed disperser. Under the conditions of room temperature and 8000 rpm, add the aqueous solution of γ-aminopropyltriethoxysilane obtained in B2 dropwise to the high-speed disperser. The mass of the added perlite powder is 20%. After the addition is completed, maintain the dispersion for 20 minutes and then dry to obtain activated perlite powder.

[0130] B4. Prepare a 60% aqueous solution of methyltrimethoxysilane and a 60% ethyl acetate solution of polyacrylate. Mix the two in a mass ratio of 1:1 and react for 2 hours under stirring conditions of 80°C and 60 r / min in a water bath to obtain the complex.

[0131] B5. Pour the composite obtained in B4 into a mold and perform heat curing treatment. Then grind the cured composite and pass it through a 16-mesh sieve to obtain activated methyltrimethoxysilane.

[0132] B6. Mix the activated perlite powder obtained in B3 and the activated methyltrimethoxysilane obtained in B5 at a mass ratio of 1:0.5 to obtain the modified perlite composite powder.

[0133] Comparative Example 4

[0134] The only difference between this comparative example and Example 1 is that activated methyltrimethoxysilane is removed in the preparation of the modified perlite composite powder.

[0135] Specifically, the preparation method of modified perlite composite powder is as follows:

[0136] B1. Crush perlite particles to a particle size of less than 1 mm to obtain perlite powder;

[0137] B2. Mix γ-aminopropyltriethoxysilane with water to prepare an aqueous solution of γ-aminopropyltriethoxysilane with a mass concentration of 1.5%.

[0138] B3. Add the perlite powder obtained in B1 to a high-speed disperser. Under the conditions of room temperature and 8000 rpm, add the aqueous solution of γ-aminopropyltriethoxysilane obtained in B2 dropwise to the high-speed disperser. The mass of the added perlite powder is 20%. After the addition is completed, maintain the dispersion for 20 minutes and then dry to obtain activated perlite powder.

[0139] B4. Prepare a 50% polyacrylate acetone solution;

[0140] B5. Add the activated perlite powder obtained in B3 to the 50% polyacrylate acetone solution obtained in B4 at a mass ratio of 1:4. Stir at 85℃ and 250r / min for 2h to obtain the composite material.

[0141] B6. Pour the composite material obtained in B5 into a mold and perform heat curing treatment. Then grind the cured composite material and pass it through a 16-mesh sieve to obtain modified perlite composite powder.

[0142] Comparative Example 5

[0143] The only difference between this comparative example and Example 1 is that the modified perlite composite powder has been removed.

[0144] Specifically, a method for preparing a new type of prefabricated UHPC decorative panel includes the following steps: S1, by weight, 60 parts of cement, 4 parts of crushed stone, 25 parts of natural sand, 1.4 parts of water-reducing agent, 0.08 parts of defoamer and 17 parts of water are mixed to obtain a preliminary mixture.

[0145] S2. By weight, add 2 parts of short steel wire fiber and 3 parts of styrene liquid-core glass fiber to the initial mixture obtained in S1, mix well, and obtain UHPC material.

[0146] S3. Vibrate and pour the UHPC material, with a vibration time of 26 seconds at the same location. After standard curing, remove the mold to obtain the prefabricated new UHPC decorative panel.

[0147] Comparative Example 6

[0148] The only difference between this comparative example and Example 1 is that the modified perlite composite powder is replaced with modified diatomaceous earth composite powder.

[0149] Specifically, a method for preparing a new type of prefabricated UHPC decorative panel includes the following steps: S1, by weight, 60 parts of cement, 4 parts of modified diatomaceous earth composite powder, 4 parts of crushed stone, 25 parts of natural sand, 1.4 parts of water-reducing agent, 0.08 parts of defoamer and 17 parts of water are mixed to obtain a preliminary mixture.

[0150] S2. By weight, add 2 parts of short steel wire fiber and 3 parts of styrene liquid-core glass fiber to the initial mixture obtained in S1, mix well, and obtain UHPC material.

[0151] S3. Vibrate and pour the UHPC material, with a vibration time of 26 seconds at the same location. After standard curing, remove the mold to obtain the prefabricated new UHPC decorative panel.

[0152] The preparation method of modified diatomaceous earth composite powder is as follows:

[0153] B1. Break the diatomaceous earth into a uniform consistency to obtain diatomaceous earth powder;

[0154] B2. Mix γ-aminopropyltriethoxysilane with water to prepare an aqueous solution of γ-aminopropyltriethoxysilane with a mass concentration of 1.5%.

[0155] B3. Add the diatomaceous earth powder obtained in B1 to a high-speed disperser. Under the conditions of room temperature and 8000 rpm, add the aqueous solution of γ-aminopropyltriethoxysilane obtained in B2 dropwise to the high-speed disperser. The mass of the added solution is 20% of the diatomaceous earth powder. After the addition is completed, maintain the dispersion for 20 minutes and then dry to obtain activated diatomaceous earth powder.

[0156] B4. Prepare a 60% aqueous solution of methyltrimethoxysilane and a 60% ethyl acetate solution of polyacrylate. Mix the two in a mass ratio of 1:1 and react for 2 hours under stirring conditions of 80°C and 60 r / min in a water bath to obtain the complex.

[0157] B5. Pour the composite obtained in B4 into a mold and perform heat curing treatment. Then grind the cured composite and pass it through a 16-mesh sieve to obtain activated methyltrimethoxysilane.

[0158] B6. Prepare a 50% polyacrylate acetone solution;

[0159] B7. Add the activated diatomaceous earth powder obtained in B3 and the activated methyltrimethoxysilane obtained in B5 to the 50% polyacrylate acetone solution obtained in B6. The mass ratio of the three is 1:0.5:4. Stir at 85℃ and 250r / min for 2h to obtain the composite material.

[0160] B8. Pour the composite material obtained in B7 into a mold and perform heat curing treatment. Then grind the cured composite material and pass it through a 16-mesh sieve to obtain modified diatomaceous earth composite powder.

[0161] Comparative Example 7

[0162] The only difference between this comparative example and Example 1 is that the modified perlite composite powder is replaced with modified calcium carbonate composite powder.

[0163] Specifically, a method for preparing a new type of prefabricated UHPC decorative panel includes the following steps: S1, by weight, 60 parts of cement, 4 parts of modified calcium carbonate composite powder, 4 parts of crushed stone, 25 parts of natural sand, 1.4 parts of water-reducing agent, 0.08 parts of defoamer and 17 parts of water are mixed to obtain a preliminary mixture.

[0164] S2. By weight, add 2 parts of short steel wire fiber and 3 parts of styrene liquid-core glass fiber to the initial mixture obtained in S1, mix well, and obtain UHPC material.

[0165] S3. Vibrate and pour the UHPC material, with a vibration time of 26 seconds at the same location. After standard curing, remove the mold to obtain the prefabricated new UHPC decorative panel.

[0166] The preparation method of modified calcium carbonate composite powder is as follows:

[0167] B1. Prepare commercially available light calcium carbonate;

[0168] B2. Mix γ-aminopropyltriethoxysilane with water to prepare an aqueous solution of γ-aminopropyltriethoxysilane with a mass concentration of 1.5%.

[0169] B3. Add B1 light calcium carbonate to a high-speed disperser. Under the conditions of room temperature and 8000 rpm, add the aqueous solution of γ-aminopropyltriethoxysilane obtained by B2 dropwise to the high-speed disperser. The mass of the added solution is 20% of the light calcium carbonate. After the addition is completed, maintain the dispersion for 20 minutes and then dry to obtain activated calcium carbonate.

[0170] B4. Prepare a 60% aqueous solution of methyltrimethoxysilane and a 60% ethyl acetate solution of polyacrylate. Mix the two in a mass ratio of 1:1 and react for 2 hours under stirring conditions of 80°C and 60 r / min in a water bath to obtain the complex.

[0171] B5. Pour the composite obtained in B4 into a mold and perform heat curing treatment. Then grind the cured composite and pass it through a 16-mesh sieve to obtain activated methyltrimethoxysilane.

[0172] B6. Prepare a 50% polyacrylate acetone solution;

[0173] B7. Add the activated calcium carbonate obtained from B3 and the activated methyltrimethoxysilane obtained from B5 to the 50% polyacrylate acetone solution obtained from B6, with a mass ratio of 1:0.5:4. Stir at 85℃ and 250r / min for 2h to obtain the composite material.

[0174] B8. Pour the composite material obtained in B7 into a mold and perform heat curing treatment. Then grind the cured composite material and pass it through a 16-mesh sieve to obtain modified calcium carbonate composite powder.

[0175] Comparative Example 8

[0176] The only difference between this comparative example and Example 1 is that the short steel wire fibers have been removed, and styrene liquid-core glass fibers have been used exclusively.

[0177] Specifically, in step S2, 5 parts by weight of styrene liquid-core glass fiber are added to the initial mixture obtained in step S1 and mixed thoroughly to obtain UHPC material.

[0178] Comparative Example 9

[0179] The only difference between this comparative example and Example 1 is that the styrene liquid core glass fiber has been removed, and short steel wire fibers are used exclusively.

[0180] Specifically, in step S2, 5 parts by weight of short steel wire fibers are added to the initial mixture obtained in step S1 and mixed thoroughly to obtain UHPC material.

[0181] Comparative Example 10

[0182] The only difference between this comparative example and Example 1 is that the vibration time at the same location is reduced to 22 seconds.

[0183] Specifically, S3, the UHPC material is vibrated and poured, with a vibration time of 22 seconds at the same location. After standard curing, the mold is removed to obtain the prefabricated new UHPC decorative panel.

[0184] Comparative Example 11

[0185] The only difference between this comparative example and Example 1 is that the styrene liquid core glass fiber is replaced with polypropylene fiber.

[0186] Comparative Example 12

[0187] The only difference between this comparative example and Example 1 is that the modified perlite composite powder and styrene liquid-core glass fiber have been removed.

[0188] Experimental Example 1

[0189] Test items: compressive strength, flexural strength (28d);

[0190] Test basis: GB / T 50081-2019 Standard for Test Methods of Physical and Mechanical Properties of Concrete;

[0191] Test subjects: UHPC materials prepared in Examples 1-11 and Comparative Examples 1-11;

[0192] Experimental results: see Table 1 and Figure 1-2 .

[0193] Experimental Example 2

[0194] Test item: Early crack resistance;

[0195] Experimental method: After 28 days of curing, observe whether cracks appear on the surface of each group of test objects, and record the length of the longest crack;

[0196] Test subjects: Prefabricated novel UHPC decorative panels prepared in Examples 1-11 and Comparative Examples 1-11;

[0197] Experimental results: see Table 1 and Figure 3 .

[0198] Experimental Example 3

[0199] Test item: Water permeability resistance (28d);

[0200] Test basis: GB / T 50082-2009 "Standard for Test Methods of Long-Term Performance and Durability of Ordinary Concrete";

[0201] Test subjects: UHPC materials prepared in Examples 1-11 and Comparative Examples 1-11;

[0202] Experimental results: see Table 1 and Figure 4 .

[0203] Test Example 4

[0204] Test item: Freeze resistance;

[0205] Test basis: GB / T 50082-2009 "Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete". After 100 freeze-thaw cycles, the mass loss rate and compressive strength loss rate of each specimen were tested.

[0206] Test subjects: UHPC materials prepared in Examples 1-11 and Comparative Examples 1-11;

[0207] Experimental results: see Table 1 and Figure 5 .

[0208] Table 1. Performance test data for Experiments 1-4

[0209]

[0210]

[0211] Results Analysis: Analysis of Examples 1-11 and the data in Table 1 shows that the UHPC material prepared by this invention has stable comprehensive performance (compressive strength, flexural strength, crack resistance, water penetration resistance and frost resistance), and has excellent frost resistance and crack resistance, ensuring that the prefabricated new UHPC decorative panels are more durable and can maintain excellent decorative effect for a longer period of time.

[0212] Analysis of Example 1 and Comparative Examples 1-12, combined with data from Table 1 and Figure 1-2It can be seen that modified perlite composite powder and styrene liquid-core glass fiber can synergistically improve the compressive and flexural strength of UHPC materials. During casting, the limited vibration time at the same location is essential; insufficient vibration time leads to a decrease in compressive and flexural strength. The inventors speculate that sufficient vibration time is necessary for some styrene liquid-core glass fibers to rupture, allowing styrene to overflow and synergistically enhance the compressive and flexural strength of the UHPC material with the modified perlite composite powder. In improving the compressive and flexural strength of UHPC materials, perlite powder cannot be easily replaced by other similar powders (such as diatomaceous earth powder or light calcium carbonate powder), otherwise the improvement effect would be weakened. Furthermore, in the preparation of modified perlite composite powder, the activation treatment of perlite powder, the participation of activated methyltrimethoxysilane, and the re-condensation powdering process of activated perlite powder and activated methyltrimethoxysilane using polyacrylate acetone solution are all essential and synergistic, working together to ultimately improve the compressive and flexural strength of the UHPC material.

[0213] Analysis of Example 1 and Comparative Examples 1-12, combined with data from Table 1 and Figure 3 It can be seen that the addition of styrene liquid-core glass fiber can directly play an early anti-cracking effect and improve the crack resistance of UHPC material; and, as verified by experiments, the role played by styrene liquid-core glass in this regard cannot be easily replaced by other fibers (polypropylene fiber); during casting, the vibration time at the same location is also very important. If the vibration time is too short (22s), cracks will also appear.

[0214] Analysis of Example 1 and Comparative Examples 1-12, combined with data from Table 1 and Figure 4 It can be seen that the participation of modified perlite composite powder and styrene liquid-core glass fiber can both improve the water permeability resistance of UHPC materials, and there is a synergistic effect between the two. In terms of improving the water permeability resistance of UHPC materials, perlite powder cannot be easily replaced by other similar powders (such as diatomite powder and light calcium carbonate powder), otherwise the improvement effect will be weakened.

[0215] Analysis of Example 1 and Comparative Examples 1-12, combined with data from Table 1 and Figure 5 It can be seen that both modified perlite composite powder and styrene liquid-core glass fiber can improve the freeze-thaw resistance of UHPC materials, and there is a synergistic effect between the two. Furthermore, in the preparation of modified perlite composite powder, the three steps of activation treatment of perlite powder, addition of activated methyltrimethoxysilane, and re-condensation of activated perlite powder and activated methyltrimethoxysilane by polyacrylate acetone solution are all essential and have a synergistic effect, which can synergistically improve the freeze-thaw resistance of UHPC materials.

[0216] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0217] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A method for preparing a prefabricated novel UHPC decorative panel, characterized in that, Includes the following steps: S1. By weight, mix 60-65 parts of cement, 4-6 parts of modified perlite composite powder, 4-6 parts of crushed stone, 25-30 parts of natural sand, 1.4-1.8 parts of water-reducing agent, 0.08-0.1 parts of defoamer and 17-22 parts of water to obtain the initial mixture. S2. By weight, add 2-3 parts of short steel wire fibers and 3-4 parts of styrene liquid-core glass fibers to the initial mixture obtained in S1, mix well, and obtain UHPC material. S3. Vibrate and pour the UHPC material. Vibrate for 26-30 seconds at the same location. Cure according to standard. After curing, remove the mold to obtain the prefabricated new UHPC decorative panel. The preparation method of the modified perlite composite powder is as follows: B1. Crush perlite particles to a particle size of less than 1 mm to obtain perlite powder; B2. Mix γ-aminopropyltriethoxysilane with water to prepare an aqueous solution of γ-aminopropyltriethoxysilane with a mass concentration of 1.5%. B3. Add the perlite powder obtained in B1 to a high-speed disperser. Under the conditions of room temperature and 8000 rpm, add the aqueous solution of γ-aminopropyltriethoxysilane obtained in B2 dropwise to the high-speed disperser. The mass of the added perlite powder is 20%. After the addition is completed, maintain the dispersion for 20 minutes and then dry to obtain activated perlite powder. B4. Prepare a 60% aqueous solution of methyltrimethoxysilane and a 60% ethyl acetate solution of polyacrylate. Mix the two in a mass ratio of 1:1 and react for 2 hours under stirring conditions of 80°C and 60 r / min in a water bath to obtain the complex. B5. Pour the composite obtained in B4 into a mold and perform heat curing treatment. Then grind the cured composite and pass it through a 16-mesh sieve to obtain activated methyltrimethoxysilane. B6. Prepare a 50% polyacrylate acetone solution; B7. Add the activated perlite powder obtained in B3 and the activated methyltrimethoxysilane obtained in B5 to the 50% polyacrylate acetone solution obtained in B6. The mass ratio of the three is 1:(0.5-0.8):(4-10). Stir at 85℃ and 250r / min for 2h to obtain the composite material. B8. Pour the composite material obtained in B7 into a mold and perform heat curing treatment. Then grind the cured composite material and pass it through a 16-mesh sieve to obtain modified perlite composite powder.

2. The method for preparing the prefabricated novel UHPC decorative panel according to claim 1, characterized in that, The cement comprises ordinary Portland cement of grade P.O52.5 and finely ground medium-heat cement of grade P.O42.5, with a mass ratio of 4:

1.

3. The method for preparing the prefabricated novel UHPC decorative panel according to claim 1, characterized in that, The water-reducing agent includes aminosulfonate high-efficiency water-reducing agent and / or polycarboxylate high-efficiency water-reducing agent.

4. The method for preparing the prefabricated novel UHPC decorative panel according to claim 1, characterized in that, The defoamer used is a polyether-modified silicone defoamer.

5. The method for preparing the prefabricated novel UHPC decorative panel according to claim 1, characterized in that, The particle size of the crushed stone is 5.5-7.0 mm.

6. The method for preparing the prefabricated novel UHPC decorative panel according to claim 1 or 5, characterized in that, The particle size of the natural sand is less than 4.5 mm.

7. The method for preparing the prefabricated novel UHPC decorative panel according to claim 1, characterized in that, The steel wire short fibers have a length of 10-15 mm and a diameter of 0.2-0.5 mm.

8. An application of a prefabricated novel UHPC decorative panel, characterized in that, The prefabricated novel UHPC decorative panel is prepared by the preparation method described in any one of claims 1-7. The prefabricated novel UHPC decorative panel is suspended on the outside of the wall by a dry-hanging construction method to achieve decorative or heat preservation effects.

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