Preparation method and application of concrete based on ELMENTI lime stone
By preparing a concrete based on ELEMENTI limestone, the problems of limestone's easy breakage and water absorption and staining were solved, stable use and rapid repair under high temperatures were achieved, the flexural properties were enhanced, the scope of application was expanded, and costs were reduced.
Patent Information
- Application Number
- CN202510809744.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-12
- Publication Date
- 2025-09-09
AI Technical Summary
As a building material, limestone has problems such as easy breakage, natural cracks, water absorption and stains, easy fading, poor sound insulation, moisture resistance and weathering resistance. In addition, the processing cost of special-shaped products is high, which limits its application range.
Using the ELEMENTI limestone-based concrete preparation method, a specific proportion of sulphoaluminate cement, quartz sand, white jade and other materials are added with sodium cellulose, defoaming agent and short glass fiber to form a durable, lightweight concrete material that can be used in high temperature environments and has rapid repair capabilities.
The material's temperature resistance, flexural strength and impact resistance have been improved, the density has been reduced, the acid and alkali resistance and stain resistance have been enhanced, the application scenarios have been expanded, the cost has been reduced, and it can adapt to complex styling requirements.
Smart Images
Figure CN120607394A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of concrete manufacturing, and specifically relates to a concrete preparation method and application based on ELEMENTI limestone. Background Art
[0002] Limestone, also known as the "Stone of Life," is a natural stone with a unique texture and excellent properties. It's a popular and fashionable stone treasure in Europe and the United States, widely used in exterior walls, floors, wine cellars, gardens, sculptures, and is the preferred material for cathedrals and European-style villas. It is a crystalline stone formed from alluvial deposits of seafloor debris, shells, and corals that formed hundreds of millions of years ago through the accumulation of weather and crustal movement. Due to varying years of deposition and changes in crustal pressure, limestone has a variety of hardness and color. Its surface has textured natural pores that absorb the surrounding air's humidity and temperature, making it a rare and precious stone suitable for advanced processing.
[0003] However, limestone lacks elasticity. If used as a panel, any breakage requires complete replacement and cannot be repaired. Furthermore, due to its natural nature, limestone is prone to natural cracks, and any external impact can accelerate the rate of cracking. Limestone also contains calcium carbonate and has fine pores on its surface, making it susceptible to water and dirt stains. Prolonged exposure to sunlight can also cause fading. Limestone is easily affected by heat, and high temperatures can adversely affect its performance. It also has poor sound insulation, moisture resistance, and weathering resistance. Furthermore, the high processing cost of special-shaped products greatly limits the application of limestone.
[0004] Therefore, in order to meet the growing demand for limestone, it is very necessary to study a material that can replace limestone. Summary of the Invention
[0005] The purpose of the present invention is to provide a method for preparing concrete based on ELEMENTI limestone and its application in order to solve the above-mentioned problems.
[0006] The technical solution adopted by the present invention is as follows: a method for preparing concrete based on ELEMENTI limestone, the preparation method comprising the following steps:
[0007] S1: First, weigh the raw materials for preparing the overall concrete, and put 30 parts of 62.5# low-alkalinity sulphoaluminate cement, 3 parts of cement expansion agent, 40 parts of quartz sand, 10 parts of white jade, 1 part of color powder, and 3 parts of silicon carbide powder into a mixer and stir for standby;
[0008] S2: Add 30 parts of acrylic emulsion water to every 100 parts of the powder prepared in step S1 and stir until the mixture becomes a paste;
[0009] S3: Add 0.2 parts of sodium cellulose, 0.5 parts of defoamer, 2 parts of melamine water reducer, and 10 parts of cement additive to the material in step S2 and continue stirring
[0010] S4: Add 3 parts of aluminum hydroxide powder, 3 parts of coral stone, 3 parts of sea shells, 3 parts of seabed sand, and 5 parts of lightweight filler to the materials in step S3. Stir in the mixer at 2800 rpm for at least 5 minutes in both forward and reverse directions to ensure that the materials are evenly distributed in the concrete.
[0011] S5: inject the material obtained in step S4 into the screw pump, add 2 parts of 14 nanometer glass short fibers and continue stirring
[0012] S6: The concrete obtained above can be used for pouring or pouring.
[0013] In a preferred embodiment, in step S1, the formula ratio of the raw materials for preparing concrete is: 30 parts of acrylic emulsion water, 30 parts of 62.5# low-alkalinity sulphoaluminate cement, 3 parts of cement expansion agent, 40 parts of quartz sand, 10 parts of white jade, 10 parts of cement additive, 0.2 parts of sodium cellulose, 0.5 parts of defoaming agent, 2 parts of melamine water reducer, 2 parts of 14 nanometer glass short fiber, 3 parts of aluminum hydroxide powder, 3 parts of coral stone, 3 parts of sea shells, 3 parts of seabed sand, 1 part of color powder, 3 parts of silicon carbide powder, and 5 parts of lightweight filler.
[0014] In a preferred embodiment, the cement additive includes: phenyl vinyl silicone resin, aminosilane coupling agent, emulsifier, defoaming agent, and water.
[0015] In a preferred embodiment, the formula of the phenyl vinyl silicone resin is: 100 parts of phenyltrichlorosilane, 100 parts of tetramethyldivinyldisiloxane (double-head seal), 30 parts of fluoroboron MQ resin, 43 parts of 1% hydrogenated silicone oil, 50 parts of Custer catalyst, 50 parts of modified titanium dioxide, 10 parts of 107 silicone rubber, 100 parts of toluene / xylene solution, 3-10 parts of sodium bicarbonate, and activated carbon (for adsorbing residual toluene).
[0016] In a preferred embodiment, the preparation method of the phenyl vinyl silicone resin comprises:
[0017] S2.1: 100 parts of phenyltrichlorosilane, 100 parts of tetramethyldivinyldisiloxane (double-end seal), and 30 parts of fluoroboron MQ resin, diluted separately with toluene / xylene solution, with a dilution ratio of 4:1
[0018] S2.2: Add 100 parts of diluted phenyltrichlorosilane, 100 parts of diluted tetramethyldivinyldisiloxane (double-end sealed), and 30 parts of diluted fluoroboron MQ resin into an appropriate solvent, mix and stir evenly, and heat to 40-50°C for pre-equilibration reaction for 20 minutes.
[0019] S2.3: Slowly add 43 parts of 1% hydrogenated silicone oil, 50 parts of modified titanium dioxide, and 10 parts of 107 silicone rubber to the mixture in S2.2 with stirring, and heat to 40-50°C for pre-equilibrium reaction for 20 minutes.
[0020] S2.4: Add 50 parts of Custer catalyst to the mixed solution, stir thoroughly for 10 minutes, raise the temperature to 60-70°C, and continue the reaction for 1 hour.
[0021] S2.5: Allow the mixed solution to cool to room temperature (10-25°C). Test the pH and adjust the pH to between 7 and 9 by adding sodium bicarbonate.
[0022] S1.6: Add activated carbon for adsorption to reduce residual toluene, and filter the activated carbon to obtain the phenyl vinyl silicone resin product.
[0023] In a preferred embodiment, in step S2, the powder materials premixed in step S1 are mixed at a ratio of 30 parts acrylic emulsion water per 100 parts powder, using a horizontal twin-shaft mixer for initial mixing. The equipment operating parameters are set at a stirring shaft speed of 1200 rpm, a stirring time of 5 minutes, and a mixing temperature controlled at 20-25°C. The shear and lifting forces of the twin helical blades achieve initial fusion of the powder and liquid phases, forming a paste-like matrix with a viscosity of approximately 8,000-10,000 cps. During this stage, the ambient humidity must be maintained below 60% to prevent surface crusting of the material. During stirring, changes in material viscosity must be continuously monitored to ensure that thixotropic fluid properties are met.
[0024] In a preferred embodiment, in the step S3, sodium cellulose, defoaming agent, melamine water-reducing agent and cement additive are added to the base material of step S2 in order, and a planetary mixer is used for enhanced dispersion. The equipment parameters are set to an orbital speed of 80 rpm, an autogenous speed of 240 rpm, a gradient increase in speed to 350 rpm, and a total stirring time of 8 minutes. Nano-scale material dispersion is achieved through a three-stage gradient stirring program (low-speed premixing-medium-speed dispersion-high-speed shearing), focusing on controlling the ambient pressure (0.08-0.1MPa) and temperature (25±2°C) during the defoaming agent addition stage to ensure that the bubble elimination efficiency is more than 95%, and the final slurry bulk density is stabilized at 1.68-1.72g / cm 3 interval.
[0025] In a preferred embodiment, in the step S4, the slurry of step S3 is transferred to a high shear disperser, the process parameters of the rotor speed of 2800 rpm and the stator gap of 0.3 mm are set, and the forward and reverse alternating stirring program is performed. The forward rotation stage lasts for 5 minutes to achieve the uniform embedding of the lightweight filler (lignin fiber and perlite 1:1 composite), and the reverse stage lasts for 5 minutes to complete the three-dimensional distribution of special-shaped aggregates such as coral stone and sea shells. During the process, the material temperature is monitored in real time and does not exceed 45°C. The shear heat accumulation is controlled by the cooling water circulation system to ensure that the directional arrangement degree of aluminum hydroxide powder and silicon carbide whiskers reaches more than 85%, and the final apparent density of the mixture is reduced to 1.45-1.48 g / cm 3 .
[0026] In a preferred embodiment, in the step S5, the material of step S4 is pumped to a high-speed stirring cylinder using a screw pump delivery system, and 14 nanometer-level glass short fibers are injected under a pressure of 0.3-0.5 MPa. The stirring cylinder is equipped with a dual-frequency motor drive, a 0-50 Hz frequency conversion control range is set, and a three-stage fiber dispersion process is performed: the initial stage (20 Hz, 3 minutes) realizes the preliminary loosening of the fibers, the strengthening stage (35 Hz, 4 minutes) completes the construction of the fiber three-dimensional network, and the final stage (50 Hz, 2 minutes) ensures that the fiber length distribution conforms to the normal curve (peak value 12 ± 2 mm). The fiber volume content is controlled by an online monitoring system at 0.2% to 0.25%, and the final tensile strength of the composite material is increased to 28-32 MP.
[0027] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:
[0028] 1. In the present invention, the practicality and durability of the material are significantly improved through the formula in this application. It greatly improves the temperature resistance and can be used for a long time in a high temperature environment of 200°C to 400°C, avoiding the common problems of fracture and pulverization of natural stone. At the same time, the material has enhanced flexural strength and impact resistance, is not easy to crack or deform, and can be quickly repaired even if partially damaged. The stain resistance and acid and alkali resistance are also enhanced, effectively preventing oil penetration and fading, making daily cleaning more worry-free. In addition, the overall density is reduced by filling with lightweight materials, making the product lighter and thinner, reducing the burden of handling and installation.
[0029] 2. This invention optimizes cost and application scope. It perfectly replicates the texture and grain of natural limestone, but at a lower price. The production process is controllable, avoiding the resource constraints of natural stone. Its enhanced ability to shape special shapes allows it to flexibly adapt to complex styling requirements, significantly expanding its application scenarios, such as building exteriors, interior decoration, and landscaping. Overall, this material retains the visual beauty of natural limestone while compensating for its natural defects through improved performance, providing users with a more reliable, economical, and easy-to-maintain solution.
[0030] 3. In the present invention, sulfoaluminate cement-based concrete is used to imitate limestone to solve the above problems. This invention is named as the preparation method and application of ELEMENTI (Yuansu) limestone concrete. ELEMENTI limestone greatly improves the temperature resistance and makes the product light and thin, so that it can be used for a long time in an environment of 200 to 400 degrees without the occurrence of broken bands, cracks, powdering and other phenomena. ELEMENTI limestone can also be repaired quickly, and has better flexural resistance and special-shaped molding capabilities than natural limestone, reducing the possibility of alkali reaction, and is not easy to fade or crack. ELEMENTI limestone has better acid and alkali resistance and stain resistance than natural limestone, can perfectly replicate the texture and advantages of limestone, and has a lower cost, which greatly increases the application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] Figure 1 It is a schematic diagram of the process principle of the present invention;
[0032] Figure 2 This is a diagram of the bending test device and loading method of the present invention. DETAILED DESCRIPTION
[0033] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0034] Reference Figure 1-2 ,
[0035] A method for preparing concrete based on ELEMENTI limestone, the method comprising the following steps:
[0036] S1: First, weigh the raw materials for preparing the overall concrete, and put 30 parts of 62.5# low-alkalinity sulphoaluminate cement, 3 parts of cement expansion agent, 40 parts of quartz sand, 10 parts of white jade, 1 part of color powder, and 3 parts of silicon carbide powder into a mixer and stir for standby;
[0037] S2: Add 30 parts of acrylic emulsion water to every 100 parts of the powder prepared in step S1 and stir until the mixture becomes a paste;
[0038] S3: Add 0.2 parts of sodium cellulose, 0.5 parts of defoamer, 2 parts of melamine water reducer, and 10 parts of cement additive to the material in step S2 and continue stirring
[0039] S4: Add 3 parts of aluminum hydroxide powder, 3 parts of coral stone, 3 parts of sea shells, 3 parts of seabed sand, and 5 parts of lightweight filler to the materials in step S3. Stir in the mixer at 2800 rpm for at least 5 minutes in both forward and reverse directions to ensure that the materials are evenly distributed in the concrete.
[0040] S5: inject the material obtained in step S4 into the screw pump, add 2 parts of 14 nanometer glass short fibers and continue stirring
[0041] S6: The concrete obtained above can be used for pouring or pouring.
[0042] In step S1, the formula ratio of the raw materials for preparing concrete is: 30 parts of acrylic emulsion water, 30 parts of 62.5# low-alkalinity sulphoaluminate cement, 3 parts of cement expansion agent, 40 parts of quartz sand, 10 parts of white jade, 10 parts of cement additive, 0.2 parts of sodium cellulose, 0.5 parts of defoaming agent, 2 parts of melamine water reducer, 2 parts of 14 nanometer glass short fiber, 3 parts of aluminum hydroxide powder, 3 parts of coral stone, 3 parts of sea shells, 3 parts of seabed sand, 1 part of color powder, 3 parts of silicon carbide powder, and 5 parts of lightweight filler.
[0043] The cement additives include: phenyl vinyl silicone resin, aminosilane coupling agent, emulsifier, defoamer and water.
[0044] The formula of the phenyl vinyl silicone resin is: 100 parts of phenyltrichlorosilane, 100 parts of tetramethyldivinyldisiloxane (double-head seal), 30 parts of fluoroboron MQ resin, 43 parts of 1% hydrogenated silicone oil, 50 parts of Custer catalyst, 50 parts of modified titanium dioxide, 10 parts of 107 silicone rubber, 100 parts of toluene / xylene solution, 3-10 parts of sodium bicarbonate, and activated carbon (for adsorbing residual toluene).
[0045] The preparation method of the phenyl vinyl silicone resin comprises:
[0046] S2.1: 100 parts of phenyltrichlorosilane, 100 parts of tetramethyldivinyldisiloxane (double-end seal), and 30 parts of fluoroboron MQ resin, diluted separately with toluene / xylene solution, with a dilution ratio of 4:1
[0047] S2.2: Add 100 parts of diluted phenyltrichlorosilane, 100 parts of diluted tetramethyldivinyldisiloxane (double-end sealed), and 30 parts of diluted fluoroboron MQ resin into an appropriate solvent, mix and stir evenly, and heat to 40-50°C for pre-equilibration reaction for 20 minutes.
[0048] S2.3: Slowly add 43 parts of 1% hydrogenated silicone oil, 50 parts of modified titanium dioxide, and 10 parts of 107 silicone rubber to the mixture in S2.2 with stirring, and heat to 40-50°C for pre-equilibrium reaction for 20 minutes.
[0049] S2.4: Add 50 parts of Custer catalyst to the mixed solution, stir thoroughly for 10 minutes, raise the temperature to 60-70°C, and continue the reaction for 1 hour.
[0050] S2.5: Allow the mixed solution to cool to room temperature (10-25°C). Test the pH and adjust the pH to between 7 and 9 by adding sodium bicarbonate.
[0051] S1.6: Add activated carbon for adsorption to reduce residual toluene, and filter the activated carbon to obtain the phenyl vinyl silicone resin product.
[0052] In step S2, the powder materials premixed in step S1 are mixed at a ratio of 30 parts acrylic emulsion water to every 100 parts powder, using a horizontal twin-shaft mixer for initial mixing. The equipment operating parameters are set at a stirring shaft speed of 1200 rpm, a stirring time of 5 minutes, and a mixing temperature controlled at 20-25°C. The shear and lifting forces of the twin helical blades achieve initial fusion of the powder and liquid phases, forming a paste-like matrix with a viscosity of approximately 8,000-10,000 cps. During this stage, the ambient humidity must be maintained below 60% to prevent surface crusting of the material. During the stirring process, changes in material viscosity must be continuously monitored to ensure that thixotropic fluid properties are met.
[0053] In the step S3, sodium cellulose, defoaming agent, melamine water-reducing agent and cement additive are added to the base material of step S2 in sequence, and a planetary mixer is used for enhanced dispersion. The equipment parameters are set to an orbital speed of 80 rpm, an autorotational speed of 240 rpm, and a gradient increase in speed to 350 rpm, with a total stirring time of 8 minutes. Nano-scale material dispersion is achieved through a three-stage gradient stirring program (low-speed premixing - medium-speed dispersion - high-speed shearing), focusing on controlling the environmental pressure (0.08-0.1MPa) and temperature (25±2°C) during the defoaming agent addition stage to ensure that the bubble elimination efficiency is more than 95%, and the final slurry bulk density is stabilized at 1.68-1.72g / cm 3 interval.
[0054] In the step S4, the slurry of step S3 is transferred to a high shear disperser, and the process parameters of the rotor speed is set to 2800 rpm and the stator gap is set to 0.3 mm, and the forward and reverse alternating stirring program is performed. The forward rotation stage lasts for 5 minutes to achieve the uniform embedding of the lightweight filler (lignin fiber and perlite 1:1 composite), and the reverse stage lasts for 5 minutes to complete the three-dimensional distribution of special-shaped aggregates such as coral stone and sea shells. During the process, the material temperature is monitored in real time and does not exceed 45°C. The shear heat accumulation is controlled by the cooling water circulation system to ensure that the directional arrangement degree of aluminum hydroxide powder and silicon carbide whiskers reaches more than 85%, and the final apparent density of the mixture is reduced to 1.45-1.48 g / cm 3 .
[0055] In the step S5, the material of step S4 is pumped to a high-speed mixing tank using a screw pump delivery system, and 14 nanometer-level glass short fibers are injected under a pressure of 0.3-0.5 MPa. The mixing tank is equipped with a dual-frequency motor drive, and a 0-50Hz variable frequency control range is set to perform a three-stage fiber dispersion process: the initial stage (20Hz, 3 minutes) realizes the initial loosening of the fibers, the strengthening stage (35Hz, 4 minutes) completes the construction of the fiber three-dimensional network, and the final stage (50Hz, 2 minutes) ensures that the fiber length distribution conforms to the normal curve (peak value 12±2mm). The fiber volume content is controlled by an online monitoring system at 0.2% to 0.25%, and the final tensile strength of the composite material is increased to 28-32MP.
[0056] An application of a concrete preparation method based on ELEMENTI limestone, the application comprising using the method to prepare concrete, the concrete being used for pouring or grouting.
[0057] Concrete specimens were prepared using the above method. The experimental results of the concrete specimen materials are shown in the following table:
[0058] Concrete specimen material test results information table
[0059]
[0060] Control sample natural limestone material test results information table
[0061]
[0062]
[0063] Experimental methods include:
[0064] 1. Preparation of test panels: Under the same conditions as the product, form several test panels:
[0065] 1-2 Bulk density, moisture content and water absorption test:
[0066] 1-2.1 Instruments and Equipment:
[0067] 1-2.1.1 Drying oven: The temperature can be controlled at (100±5)℃.
[0068] 1-2.1.2 Balance: Weighing range 0g~1000g, accuracy 0.1g.
[0069] 1-2.1.3 Vernier caliper: Measuring range 0mm to 200mm, accuracy 0.02mm.
[0070] 1-2.1.4 Dryer.
[0071] 1-2.1.5 Water Container.
[0072] 1-2.2 Test steps:
[0073] 1-2.2.1 Place the specimen in a well-ventilated room for 3 days and weigh its air-dry mass m1 to the nearest 0.1 g.
[0074] 1-2.2.2 Place the specimen in a drying oven at (60 ± 5)°C for at least 24 hours. Weigh the specimen every 2 hours until the difference between two consecutive weighings is less than 0.5% of the smaller value. Remove the specimen from the drying oven and cool it to room temperature in a desiccator. Weigh its dry mass (m2) to the nearest 0.1g.
[0075] 1-2.2.3 The volume V is measured as follows: Measure the length of each pair of corresponding sides twice, and take the average value as the side lengths c1 and c2, accurate to 0.1 mm; measure the thickness once at the center of each of the four sides, and take the average value as the thickness h of the specimen, accurate to 0.1 mm.
[0076] 1-2.2.4 Immerse the specimen in water at a temperature not less than 10°C for at least 24 hours. Weigh the specimen every 2 hours until the difference between two consecutive weighings is less than 0.5% of the smaller value. Remove the specimen from the water, wipe off the surface moisture with a damp towel, and weigh its mass (m3) in the saturated state to the nearest 0.1 g.
[0077] 1-3 Compressive strength test:
[0078] 1-3.1 Instruments and Equipment:
[0079] 1-3.1.1 Electronic pressure testing machine: force range 0 kN to 100 kN, accuracy 1%.
[0080] 1-3.1.2 Vernier caliper: Measuring range 0mm to 200mm, accuracy 0.02mm.
[0081] 1-3.2 Test steps:
[0082] 1-3.2.1 Place the specimen in a well-ventilated room for 3 days.
[0083] 1-3.2.2 The 12 specimens were randomly divided into two groups. Six specimens were loaded parallel to the specimen template surface (referred to as in-plane compression, i.e., the loading direction was parallel to the fiber distribution surface), and the other six specimens were loaded perpendicular to the specimen template surface (referred to as out-of-plane compression, i.e., the loading direction was perpendicular to the fiber distribution surface).
[0084] 1-3.2.3 Measure the dimensions of the compression surface of each specimen, measuring its length a1 and width b1 at the center of the specimen to the nearest 0.1 mm.
[0085] 1-3.2.4 Place the specimen on the pressure plate of the press, ensuring that the specimen is centered under pressure. Apply load at a uniform rate of 2 mm / min to 5 mm / min until the specimen fails.
[0086] 1-3.2.5 Record the failure load, Pc, to the nearest 10N.
[0087] 1-3.3 Result calculation:
[0088] According to the formula: The compressive strength was calculated and the result was expressed as the arithmetic mean of six specimens in each load direction, accurate to 0.1 MPa.
[0089] Where:
[0090] σc------compressive strength, unit is MPa;
[0091] Pc------Failure load, in Newton (N);
[0092] a1------the length of the compressive surface of the specimen, in millimeters (mm);
[0093] 1-4 Flexural properties (proportional ultimate strength, ultimate strength, elastic modulus)
[0094] 1-4.1 Instruments and Equipment
[0095] 1-4.1.1 Electronic universal testing machine: force range 0 kN to 20 kN, accuracy 1%.
[0096] 1-4.1.2 Vernier caliper: Measuring range 0 mm to 200 mm, accuracy 0.02 mm.
[0097] 1-4.1.3 Deflectometer: Measuring range 0mm to 50mm, accuracy 0.02mm.
[0098] 1-4.2 Test steps
[0099] 1-4.2.1 Place the specimen in a well-ventilated room for 3 days.
[0100] 1-4.2.2 Bending test apparatus and loading method Figure 2 The device is made of steel and the diameter of the supporting roller is 12mm. For the bending test to check the quality of the product, the span of the test piece can be 16 to 20 times the thickness.
[0101] 1-4.2.3 For specimens reinforced entirely with chopped glass fibers, three specimens shall have their templates facing downward and three specimens shall have their templates facing upward. For specimens reinforced with continuous fibers or fiber fabrics, the principal plane of the continuous fibers or fibers shall face downward. The specimens produced by our company adopt the latter test method.
[0102] 1-4.2.4 Apply uniform load at a rate of 2 mm / min to 5 mm / min until the specimen fails. Record the load-deflection curve or directly read the flexural failure load, Pm.
[0103] 1-4.2.5 Avoid the failure section and measure the width b and thickness h of the specimen close to the failure, both with an accuracy of 0.1 mm.
[0104] 1-4.3 Result processing:
[0105] 1-4.3.1 Read the following values from the load-deflection curve:
[0106] (1) Proportional limit load P1 (i.e., the load at the point where the curve begins to depart from the straight line);
[0107] (2) Failure load Pm (i.e., the load at the highest point on the curve);
[0108] (3)2 / 3×P1;
[0109] (4) The deflection value δ corresponding to point (2 / 3×P1).
[0110] 1-4.3.2 According to the formula: Calculate the proportional ultimate strength in bending according to the formula: The ultimate flexural strength was calculated and the results were expressed as the arithmetic mean of six specimens, accurate to 0.1 MPa;
[0111] 1-5 Frost resistance test:
[0112] 1-1-1 Instruments and Equipment
[0113] 1-1-1.1 Low temperature box: The temperature can be adjusted to (-20±2)℃.
[0114] 1-1-1.2 Thermometer: Measuring range 10℃~50℃.
[0115] 1-1-1.3 Water container.
[0116] 1-1-1.4 Test stand.
[0117] 1-1-1.5 Automatic freeze-thaw equipment: Conforms to the requirements of JG / T243 slow freeze-thaw test equipment, with air-freeze holding time and water-thaw holding time adjustable within 1h to 2h respectively.
[0118] 1-1-2 Test steps
[0119] 1-1-2.1 Soak the test piece in clean water at 15°C for 24 hours, take it out, and check for defects caused by cutting.
[0120] 1-1-2.2 After immersion, the specimens shall stand sideways on the test stand with a spacing of not less than 15 mm.
[0121] 1-1-2.3 Place the specimen in a low-temperature box that has been cooled to (-20±2)℃ in advance and freeze for 2 hours. The freezing time starts when the temperature drops back to (-20±2)℃ after the specimen is placed. Remove the specimen and thaw it in clean water at (20±5)℃ for 1 hour. This constitutes one cycle. After every five cycles, the freeze-thaw specimen should be visually inspected. The surface should be wiped dry and the specimen should be inspected for any damage such as delamination or peeling.
[0122] 1-1-3 Test Results
[0123] 1-1-3.1 After 25 freeze-thaw cycles as specified in the product standard, the specimens shall show no delamination, peeling or other damage.
[0124] 1-6 High temperature resistance test
[0125] The high temperature resistance test sample is 250*50*10mm, and the quantity is 6 pieces.
[0126] 1-6.1 Instruments and Equipment
[0127] 1-6.1.1 High-temperature boiling furnace: Maximum operating temperature is (1200±5)℃.
[0128] 1-6.1.2 Electronic universal testing machine: force range 0 kN to 20 kN, accuracy 1%.
[0129] 1-6.1.3 Electronic pressure testing machine: force range 0 kN to 100 kN, accuracy 1%.
[0130] 1-6.1.4 Vernier caliper: Measuring range 0 mm to 200 mm, accuracy 0.02 mm.
[0131] 1-6.1.5 Deflectometer: Measuring range 0mm to 50mm, accuracy 0.02mm.
[0132] 1-6.2 Test steps
[0133] 1-6.2.1 Place the specimen in a well-ventilated room for 3 days and weigh its air-dry mass to the nearest 0.1 g.
[0134] 1-2.2.2 Place the specimen in a high-temperature furnace at (500±5)°C. Begin counting the time after the furnace temperature reaches 200°C. Maintain the temperature for 2 hours after reaching 500°C, then remove the specimen. Once the specimen returns to room temperature, repeat the cycle. Each cycle lasts approximately 4 hours. Perform a visual inspection of the specimen after every five cycles to check for signs of delamination, flaking, or powdering.
[0135] 1-2.2.3 After 30 cycles of testing, remove the specimen and, after returning to room temperature, perform flexural and density tests on the specimen to verify its performance retention rate.
[0136] 1-7Pollution resistance test GB / T35157—2017
[0137] 1-7.1 Equipment and reagents must meet the following requirements: a) Contamination source reagents: edible soy sauce, black shoe polish, blue ink, colored vinegar, strawberry juice, lipstick (of a contrasting color to the test specimen), red wine, coffee, orange juice, and wet tea bags. b) Glass surface III. c) Soft cloth or soft-bristled brush.
[0138] 1-7.2 Test steps:
[0139] 1-7.2.1 Place each of the 10 contamination source reagents on the surface of two groups of specimens (covering approximately 1 cm2 of surface area). Cover one group with a watch glass or other suitable container to prevent evaporation, while leaving the other group uncovered. After 16 hours, wipe off any remaining reagents with a clean, soft cotton cloth or paper towel.
[0140] 1-7.2.2 Wash the specimen with tap water and scrub the surface 20 times with a soft cloth or soft-bristled brush with appropriate force. Absorb the water with paper. If the color of the reagent disappears completely, the stain resistance value of the specimen is 1.
[0141] 1-7.2.3 If stains are still present, scrub with alcohol 20 times. If the stains are removed, the stain resistance value of the specimen is 2.
[0142] 1-7.2.4 If stains are still present, scrub with detergent 20 times, rinse thoroughly, and dry. If the stains are removed, the stain resistance value of the specimen is 3.
[0143] If stains are still present in 1-7.2.5, scrub with detergent 40 times, rinse thoroughly, and dry thoroughly. If the stains are removed, the stain resistance value of the specimen is 4; otherwise, the stain resistance value is 5.
[0144] 1-7.3 Result Presentation: Record the pollution resistance values of 10 pollution source reagents, and report the maximum pollution resistance value as the result.
[0145] From the above we can know:
[0146] In the present invention, the practicality and durability of the material are significantly improved through the formula in this application. It greatly improves the temperature resistance and can be used for a long time in a high temperature environment of 200°C to 400°C, avoiding the common problems of fracture and pulverization of natural stone. At the same time, the material has enhanced flexural strength and impact resistance, is not easy to crack or deform, and can be quickly repaired even if partially damaged. The stain resistance and acid and alkali resistance are also enhanced, effectively preventing oil penetration and fading, making daily cleaning more worry-free. In addition, the overall density is reduced by filling with lightweight materials, making the product lighter and thinner, reducing the burden of handling and installation.
[0147] This invention optimizes both cost and application scope. It perfectly replicates the feel and texture of natural limestone, but at a lower price. The production process is controllable, avoiding the resource constraints of natural stone. Its enhanced ability to create special shapes allows it to flexibly adapt to complex styling requirements, significantly expanding its application scenarios, such as building exteriors, interior decoration, and garden landscaping. Overall, this material retains the visual beauty of natural limestone while compensating for its natural defects through improved performance, providing users with a more reliable, economical, and easy-to-maintain solution.
[0148] In the present invention, sulfoaluminate cement-based concrete is used to imitate limestone to solve the above problems. This invention is named as the preparation method and application of ELEMENTI (Yuansu) limestone concrete. ELEMENTI limestone greatly improves the temperature resistance and makes the product light and thin, so that it can be used for a long time in an environment of 200 to 400 degrees without the occurrence of broken bands, cracks, powdering and other phenomena. ELEMENTI limestone can also be repaired quickly, and has better flexural resistance and special-shaped molding capabilities than natural limestone, reducing the possibility of alkali reaction, and is not easy to fade or crack. ELEMENTI limestone has better acid and alkali resistance and stain resistance than natural limestone, can perfectly replicate the texture and advantages of limestone, and has a lower cost, which greatly increases the application scenarios.
[0149] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further limitations, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.
[0150] The above description is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A method for preparing concrete based on ELEMENTI limestone, characterized by: The preparation method comprises the following steps: S1: First, weigh the raw materials for preparing the overall concrete, and put 30 parts of 62.5# low-alkalinity sulphoaluminate cement, 3 parts of cement expansion agent, 40 parts of quartz sand, 10 parts of white jade, 1 part of color powder, and 3 parts of silicon carbide powder into a mixer and stir for standby; S2: Add 30 parts of acrylic emulsion water to every 100 parts of the powder prepared in step S1 and stir until the mixture becomes a paste; S3: Add 0.2 parts of sodium cellulose, 0.5 parts of defoamer, 2 parts of melamine water reducer, and 10 parts of cement additive to the material in step S2 and continue stirring S4: Add 3 parts of aluminum hydroxide powder, 3 parts of coral stone, 3 parts of sea shells, 3 parts of seabed sand, and 5 parts of lightweight filler to the materials in step S3. Stir in the mixer at 2800 rpm for at least 5 minutes in both forward and reverse directions to ensure that the materials are evenly distributed in the concrete. S5: inject the material obtained in step S4 into the screw pump, add 2 parts of 14 nanometer glass short fibers and continue stirring S6: The concrete obtained above can be used for pouring or pouring.
2. The method for preparing concrete based on ELEMENTI limestone according to claim 1, wherein: In step S1, the formula ratio of the raw materials for preparing concrete is: 30 parts of acrylic emulsion water, 30 parts of 62.5# low-alkalinity sulphoaluminate cement, 3 parts of cement expansion agent, 40 parts of quartz sand, 10 parts of white jade, 10 parts of cement additive, 0.2 parts of sodium cellulose, 0.5 parts of defoaming agent, 2 parts of melamine water reducer, 2 parts of 14 nanometer glass short fiber, 3 parts of aluminum hydroxide powder, 3 parts of coral stone, 3 parts of sea shells, 3 parts of seabed sand, 1 part of color powder, 3 parts of silicon carbide powder, and 5 parts of lightweight filler.
3. The method for preparing concrete based on ELEMENTI limestone according to claim 2, wherein: The cement additives include: phenyl vinyl silicone resin, aminosilane coupling agent, emulsifier, defoamer and water.
4. A method for preparing concrete based on ELEMENTI limestone according to claim 3, characterized in that: The formula of the phenyl vinyl silicone resin is: 100 parts of phenyltrichlorosilane, 100 parts of tetramethyldivinyldisiloxane, 30 parts of fluoroboron MQ resin, 43 parts of 1% hydrogen-containing silicone oil, 50 parts of Custer catalyst, 50 parts of modified titanium dioxide, 10 parts of 107 silicone rubber, 100 parts of toluene / xylene solution, 3-10 parts of sodium bicarbonate, and activated carbon.
5. The method for preparing concrete based on ELEMENTI limestone according to claim 3, wherein: The preparation method of the phenyl vinyl silicone resin comprises: S2.1: 100 parts of phenyltrichlorosilane, 100 parts of tetramethyldivinyldisiloxane, and 30 parts of fluoroboron MQ resin, diluted separately with toluene / xylene solution, with a dilution ratio of 4:1 S2.2: Add 100 parts of diluted phenyltrichlorosilane, 100 parts of diluted tetramethyldivinyldisiloxane, and 30 parts of diluted fluoroboron MQ resin to a suitable solvent, mix and stir until uniform, and heat to 40-50°C for pre-equilibration reaction for 20 minutes; S2.3: Slowly add 43 parts of 1% hydrogenated silicone oil, 50 parts of modified titanium dioxide, and 10 parts of 107 silicone rubber to the mixture in S2.2 with stirring, and heat to 40-50°C for a pre-equilibration reaction for 20 minutes. S2.4: Add 50 parts of Custer catalyst to the mixed solution, stir thoroughly for 10 minutes, raise the temperature to 60-70°C, and continue the reaction for 1 hour; S2.5: The mixed solution is cooled to room temperature; the nano-scale material is dispersed, and the pressure and temperature of the environment during the defoamer addition phase are controlled to ensure that the bubble elimination efficiency reaches more than 95%, and the final slurry bulk density is stabilized at 1.68-1.72 g / cm 3 interval.
6. The method for preparing concrete based on ELEMENTI limestone according to claim 3, wherein: In step S2, the powder material premixed in step S1 is mixed at a ratio of 30 parts of acrylic emulsion water to every 100 parts of powder, and a horizontal twin-shaft mixer is used for initial mixing. The equipment operating parameters are set to a stirring shaft speed of 1200 rpm, a stirring time of 5 minutes, and a mixing temperature controlled at 20-25°C. The shear force and lifting force of the twin helical blades are used to achieve initial fusion of the powder and liquid phases to form a paste-like matrix with a viscosity of approximately 8000-10000 cps. During this stage, the ambient humidity must be maintained below 60% to prevent surface crusting of the material. During the stirring process, the viscosity of the material must be continuously monitored to ensure that the thixotropic fluid standard is met.
7. The method for preparing concrete based on ELEMENTI limestone according to claim 3, wherein: In step S3, sodium cellulose, a defoaming agent, a melamine water-reducing agent, and a cement additive are sequentially added to the base material of step S2, and a planetary mixer is used for enhanced dispersion; the equipment parameters are set to a revolution speed of 80 rpm, a rotation speed of 240 rpm, and a gradual increase in the speed to 350 rpm, and a total stirring time of 8 minutes; Nano-scale material dispersion is achieved through a three-stage gradient stirring process (low-speed premixing - medium-speed dispersion - high-speed shearing). The environmental pressure (0.08-0.1MPa) and temperature during the defoamer addition stage are controlled to ensure that the bubble elimination efficiency reaches more than 95%. The final slurry bulk density is stabilized at 1.68-1.72g / cm 3 interval.
8. The method for preparing concrete based on ELEMENTI limestone according to claim 1, wherein: In step S4, the slurry from step S3 is transferred to a high shear disperser, and the process parameters are set to a rotor speed of 2800 rpm and a stator gap of 0.3 mm, and a forward and reverse alternating stirring program is performed; the forward rotation stage lasts for 5 minutes to achieve uniform embedding of the lightweight filler, and the reverse rotation stage lasts for 5 minutes to complete the three-dimensional distribution of special-shaped aggregates such as coral stones and sea shells; during the process, the material temperature is monitored in real time to not exceed 45°C, and the shear heat accumulation is controlled by the cooling water circulation system to ensure that the oriented arrangement degree of the aluminum hydroxide powder and the silicon carbide whiskers reaches more than 85%, and the apparent density of the final mixture is reduced to 1.45-1.48 g / cm 3 .
9. The method for preparing concrete based on ELEMENTI limestone according to claim 1, wherein: In step S5, a screw pump delivery system is used to pump the material of step S4 into a high-speed mixing tank, and 14-nanometer glass short fibers are injected under a pressure of 0.3-0.5 MPa. The mixing tank is equipped with a dual-frequency motor drive, and a variable frequency control range of 0-50 Hz is set to perform a three-stage fiber dispersion process: the initial stage achieves preliminary loosening of the fibers, the strengthening stage completes the construction of the three-dimensional fiber network, and the final stage ensures that the fiber length distribution conforms to the normal curve. The fiber volume content is controlled by an online monitoring system at 0.2% to 0.25%, and the tensile strength of the composite material is finally increased to 28-32 MPa.
10. An application of a method for preparing concrete based on ELEMENTI limestone, characterized in that: The application includes preparing concrete using the method, and the concrete can be used for pouring or pouring.