Superfine fly ash-based composite mineral admixture and preparation method thereof

Abstract

The invention discloses an ultrafine fly ash-based composite mineral admixture and a preparation method thereof, and relates to the technical field of mineral admixtures. The high-strength concrete comprises the following components in percentage by weight: 60-80% of superfine fly ash, 5-15% of limestone powder, 5-10% of silicon powder, 5-10% of resin, 1-3% of polymer fiber and 2% of an auxiliary agent, the auxiliaries comprise 50% of a plasticizer, 20% of an anti-cracking agent, 15% of a rapid curing agent, 10% of a waterproof agent and 5% of a reinforcing agent. The superfine fly ash, the limestone powder, the silicon powder, the resin, the polymer fiber and the auxiliary agent are matched together, and mineral powder particles are finer and larger in surface area, so that the activity is higher, the cement hydration reaction can be better promoted, the early strength development and long-term performance of concrete are improved, the activity is higher, and the service life of the concrete is prolonged. Therefore, the mixing amount of the mineral admixture in concrete can be greatly increased, the cement consumption is reduced, the concrete cost is reduced, the resource consumption is reduced, and the mineral admixture has good compatibility with concrete raw materials such as cement and aggregate, is easy to cooperate for use, and has excellent construction performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mineral admixtures, in particular to a superfine fly ash-based composite mineral admixture and a preparation method thereof. BACKGROUND

[0002] In order to improve the workability of fresh concrete and the service life of hardened concrete, mineral admixtures need to be added in the process of concrete manufacturing. Mineral admixtures can not only improve the workability of fresh concrete, but also make the structure of hardened concrete more compact, so as to make the concrete more durable.

[0003] At present, the mineral admixtures used in the concrete manufacturing industry are mainly fly ash or slag powder, but the activity of fly ash or slag powder is low, that is, the degree of promoting the hydration of cement is not enough, which may affect the early strength development and long-term performance of concrete. The replacement ratio of some fly ash or slag powder is limited, and a high proportion of cement needs to be matched to meet the performance requirements of concrete, which may increase the cost of concrete and lead to a large consumption of cement.

[0004] In addition, fly ash or slag powder may contain high levels of harmful substances such as chloride ions and sulfates, which may lead to a decrease in the durability of concrete and cause corrosion problems if not treated or controlled.

[0005] Therefore, a superfine fly ash-based composite mineral admixture and a preparation method thereof are provided. SUMMARY

[0006] The purpose of the present application is to solve the problems mentioned in the background art, and the present application provides a superfine fly ash-based composite mineral admixture and a preparation method thereof.

[0007] In order to achieve the above-mentioned purpose, the present application specifically adopts the following technical solutions: A superfine fly ash-based composite mineral admixture comprises the following components in a weight ratio: superfine fly ash 60-80%, limestone powder 5-15%, silicon powder 5-10%, resin 5-10%, polymer fiber 1-3%, and auxiliary agent 2%. The auxiliary agent comprises plasticizer 50%, anti-cracking agent 20%, rapid curing agent 15%, waterproof agent 10%, and reinforcing agent 5%.

[0008] Further, the specific ratio of the components is: superfine fly ash 60%, limestone powder 15%, silicon powder 10%, resin 10%, polymer fiber 3%, and auxiliary agent 2%.

[0009] Further, the specific ratio of the components is: superfine fly ash 70%, limestone powder 10%, silicon powder 10%, resin 5%, polymer fiber 3%, and auxiliary agent 2%.

[0010] Further, the specific ratio of the components is: superfine fly ash 80%, limestone powder 7%, silicon powder 5%, resin 5%, polymer fiber 1%, and auxiliary agent 2%.

[0011] A preparation method of a superfine fly ash-based composite mineral admixture, comprising the following steps: Step one: material preparation: prepare superfine fly ash, limestone powder, silicon powder, resin, polymer fiber and auxiliary agent, accurately weigh each material, and respectively put into containers marked with numbers; Step two: pretreatment of resin: heat the resin in a heating container until it is completely liquefied; Step three: component mixing: add superfine fly ash, limestone powder and silicon powder into a mixing tank according to the formula ratio, and start the stirrer for sufficient stirring and mixing; Step four: adding resin: slowly add the pretreated resin into the mixing tank while continuously stirring and mixing, and record the resin adding time and speed; Step five: adding auxiliary agent: add the auxiliary agent into the mixture according to the formula ratio one by one, fully stir and mix after each addition, and record the adding time and sequence of each auxiliary agent; Step six: adding polymer fiber: uniformly sprinkle the polymer fiber on the surface of the mixture in the mixing tank, start the stirrer, and thoroughly mix the polymer fiber with the mixture; Step seven: adjusting the mixture: adjust the fluidity and humidity of the mixture by adding water step by step; Step eight: performance analysis: take a sample of the mixture, and perform morphological characterization analysis and performance test.

[0012] Further, the heating temperature in step two is 60°C - 80°C, the speed of the stirrer in step three is 200 rpm, and the stirring duration is 20 minutes.

[0013] Further, in step seven, the rheometer is used to test the rheological properties of the mixture.

[0014] Further, in step eight, the morphological characterization analysis is performed by scanning electron microscope (SEM) observation, and the performance test includes compression strength, crack resistance and durability test.

[0015] The beneficial effects of the present application are as follows: The mineral powder particles of the present application are finer, the surface area is larger, and thus the activity is higher, which can better promote the cement hydration reaction, improve the early strength development and long-term performance of concrete, and the activity is higher, so the mixing amount in concrete can be greatly increased, the cement consumption is reduced, the concrete cost is reduced, the resource consumption is reduced, and the mineral admixture is compatible with cement, aggregate and other concrete raw materials, easy to use, and has excellent construction performance. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application is described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments.

[0017] Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0018] The electrical components in this paper are all connected with the main controller and 220V mains of the outside world, and the main controller can be a conventional known device such as a computer.

[0019] Embodiment one: A superfine fly ash-based composite mineral admixture, comprising the following components in weight ratio: superfine fly ash 60-80%, limestone powder 5-15%, silicon powder 5-10%, resin 5-10%, polymer fiber 1-3%, and auxiliary agent 2%. The auxiliary agent includes plasticizer 50%, anti-cracking agent 20%, rapid curing agent 15%, waterproof agent 10% and reinforcing agent 5%.

[0020] The specific ratio of the components is: superfine fly ash 60%, limestone powder 15%, silicon powder 10%, resin 10%, polymer fiber 3%, and auxiliary agent 2%.

[0021] The superfine fly ash can enhance the compressive resistance and durability of the mixture, improve the flowability and compactness of the mixture. The limestone powder is the crushed stone and powder of limestone minerals such as calcium oxide (CaO) and silicon oxide (SiO2), which can provide the basic structure of the hardened mixture and release heat during the hydration process. The silica powder is fine powder of silicon dioxide (SiO2), which enhances the hardness and compressive strength of the mixture and improves the crack resistance. The resin, as a binder, can connect other components, improve the strength and durability of the composite material, and change the rheological properties of the composite material, making it easier to mix and form. The polymer fibers are made of polypropylene or other synthetic polymer materials, which increase the toughness and durability of the mixture and reduce the formation and expansion of cracks. The plasticizer in the additives can improve the plasticity and flowability of the mixture. By adding anti-cracking agents to reduce shrinkage and crack formation, by adding fast curing agents to accelerate the curing process of the mixture, by using waterproof agents to improve the waterproof performance of the mixture, and finally by adding reinforcing agents to enhance the strength and durability of the mixture.

[0022] A method for preparing a superfine fly ash-based composite mineral admixture, comprising the following steps: Step one: material preparation: prepare superfine fly ash, limestone powder, silica powder, resin, polymer fibers and additives, accurately weigh each material and put it into the container marked with the number; Step two: pretreatment of resin: heat the resin in a heated container until it is completely liquefied; Step three: component mixing: add superfine fly ash, limestone powder and silica powder to the mixing tank according to the formula ratio, start the stirrer for thorough mixing; Step four: add resin: slowly add the pretreated resin to the mixing tank while continuously stirring and mixing, record the resin addition time and speed; control the addition speed and uniformity of the resin to ensure that the resin is evenly dispersed in the mixture and avoid the formation of resin lumps.

[0023] Step five: add additives: add the additives one by one according to the formula ratio, mix thoroughly after each addition, and record the addition time and order of each additive; Step six: add polymer fibers: evenly sprinkle the polymer fibers on the surface of the mixture in the mixing tank, start the stirrer and mix the polymer fibers with the mixture thoroughly; Step seven: adjust the mixture: adjust the flowability and humidity of the mixture by adding water step by step; Step eight: performance analysis: take a sample of the mixture, perform morphological characterization analysis and performance testing.

[0024] The heating temperature in step two is 60°C - 80°C, the speed of the stirrer in step three is 200 rpm, and the duration of stirring is 20 minutes. By controlling the heating temperature and time, avoid overheating or insufficient heating of the resin, so as to affect the quality of the mixture.

[0025] In step seven, the rheological properties of the mixture are tested by a rheometer. The rheometer is used to detect the flowability of the mixture, so as to ensure the flowability of the mixture for subsequent construction or molding.

[0026] In step eight, morphological characterization analysis is performed by scanning electron microscopy (SEM) observation, and performance tests include compressive strength, crack resistance, and durability tests. Through morphological characterization analysis, the microstructure and constituent components of the mixture are understood.

[0027] Example two: A superfine fly ash-based composite mineral admixture includes the following components in the following weight proportions: Superfine fly ash 60-80%, limestone powder 5-15%, silica powder 5-10%, resin 5-10%, polymer fiber 1-3%, and additives 2%. The additives include plasticizer 50%, anti-cracking agent 20%, fast curing agent 15%, waterproofing agent 10%, and reinforcing agent 5%.

[0028] The specific proportions of the components are: superfine fly ash 70%, limestone powder 10%, silica powder 10%, resin 5%, polymer fiber 3%, and additives 2%.

[0029] The superfine fly ash can enhance the compressive strength and durability of the mixture, improve the flowability and compactness of the mixture. Limestone powder is crushed stone and powder of limestone minerals such as calcium oxide (CaO) and silicon dioxide (SiO2), which can provide the basic structure of the hardened mixture and release heat during the hydration process. Silica powder is fine powder of silicon dioxide (SiO2), which enhances the hardness and compressive strength of the mixture and improves the crack resistance. Resin, as a binder, can connect other components, improve the strength and durability of the composite material, and change the rheological properties of the composite material, making it easier to mix and form. Polymer fibers are long, thin fibers made of polypropylene or other synthetic polymer materials, which increase the toughness and durability of the mixture and reduce the formation and expansion of cracks. The plasticizer in the additives can improve the plasticity and flowability of the mixture. By adding anti-cracking agent to reduce shrinkage and crack formation in the mixture, fast curing agent to accelerate the curing process of the mixture, waterproofing agent to improve the waterproofing performance of the mixture, and finally reinforcing agent to enhance the strength and durability of the mixture.

[0030] A method for preparing a superfine fly ash-based composite mineral admixture includes the following steps: Step 1: Material Preparation: Prepare ultra-fine fly ash, limestone powder, silica powder, resin, polymer fibers, and additives. Accurately weigh each material and place them in labeled containers. Step 2: Pre-treat Resin: Heat the resin in a heated container until it is completely liquefied. Step 3: Mix Components: Add ultra-fine fly ash, limestone powder, and silica powder to the mixing tank according to the formula ratio. Start the stirrer for thorough mixing. Step 4: Add Resin: Slowly add the pre-treated resin to the mixing tank while continuously stirring. Record the resin addition time and speed. Control the resin addition speed and uniformity to ensure even distribution of the resin in the mixture, avoiding resin clumps.

[0031] Step 5: Add Additives: Add each additive to the mixture according to the formula ratio. Thoroughly mix after each addition. Record the addition time and order of each additive. Step 6: Add Polymer Fibers: Evenly sprinkle polymer fibers on the surface of the mixture in the mixing tank. Start the stirrer to thoroughly mix the polymer fibers with the mixture. Step 7: Adjust Mixture: Gradually adjust the flowability and moisture of the mixture by adding water. Step 8: Performance Analysis: Take a sample of the mixture for morphological characterization analysis and performance testing.

[0032] In Step 2, the heating temperature is 60°C - 80°C. In Step 3, the stirrer speed is 200 rpm, and the stirring duration is 20 minutes. By controlling the heating temperature and time, avoid overheating or insufficient heating of the resin to affect the quality of the mixture.

[0033] In Step 7, perform rheological performance testing on the mixture using a rheometer. Use the rheometer to detect the flowability of the mixture to ensure its flowability for subsequent construction or molding.

[0034] In Step 8, perform morphological characterization analysis using scanning electron microscopy (SEM). Performance testing includes compressive strength, crack resistance, and durability testing. Through morphological characterization analysis, understand the microstructure and composition of the mixture.

[0035] Example Three: An ultra-fine fly ash-based composite mineral admixture, comprising the following components in weight ratio: Ultra-fine fly ash 60-80%, limestone powder 5-15%, silica powder 5-10%, resin 5-10%, polymer fibers 1-3%, additives 2%. The additives include 50% plasticizer, 20% anti-cracking agent, 15% fast curing agent, 10% waterproofing agent, and 5% reinforcing agent.

[0036] The specific proportions of the components are: 80% ultra-fine fly ash, 7% limestone powder, 5% silicon powder, 5% resin, 1% polymer fiber, and 2% additives.

[0037] The ultra-fine fly ash can enhance the compressive strength and durability of the mixture, improve the flowability and compactness of the mixture. The limestone powder is a crushed stone and powder of limestone minerals such as calcium oxide (CaO) and silicon dioxide (SiO2), which can provide the basic structure of the hardened mixture and release heat during the hydration process. The silicon powder is a fine powder of silicon dioxide (SiO2), which enhances the hardness and compressive strength of the mixture and improves the crack resistance. The resin acts as a binder to connect other components, improving the strength and durability of the composite material, and can change the rheological properties of the composite material, making it easier to mix and form. The polymer fiber is a long and thin fiber made of polypropylene or other synthetic polymer materials, which increases the toughness and durability of the mixture and reduces the formation and expansion of cracks. The plasticizer in the additives can improve the plasticity and flowability of the mixture. By adding the anti-cracking agent, the shrinkage and crack formation of the mixture are reduced, the fast curing agent accelerates the curing process of the mixture, the waterproofing agent improves the waterproof performance of the mixture, and finally the reinforcing agent enhances the strength and durability of the mixture.

[0038] A method for preparing an ultra-fine fly ash-based composite mineral admixture, comprising the following steps: Step one: material preparation: prepare ultra-fine fly ash, limestone powder, silicon powder, resin, polymer fiber and additives, accurately weigh each material and put it into the container marked with the number; Step two: pretreatment of resin: heat the resin in a heated container until it is completely liquefied; Step three: component mixing: add ultra-fine fly ash, limestone powder and silicon powder to the mixing tank according to the formula ratio, start the stirrer for thorough mixing; Step four: add resin: slowly add the pretreated resin to the mixing tank while continuously stirring the mixture, record the resin addition time and speed; control the addition speed and uniformity of the resin to ensure that the resin is evenly dispersed in the mixture, avoiding the formation of resin lumps.

[0039] Step five: add additives: add the additives one by one according to the formula ratio, thoroughly mix after each addition, and record the addition time and order of each additive; Step six: add polymer fiber: evenly sprinkle the polymer fiber on the surface of the mixture in the mixing tank, start the stirrer to thoroughly mix the polymer fiber with the mixture; Step seven: adjust the mixture: adjust the flowability and humidity of the mixture by adding water step by step; Step eight: performance analysis: take a sample of the mixture, perform morphological characterization analysis and performance test.

[0040] The heating temperature in step two is 60°C - 80°C, the speed of the stirrer in step three is 200 rpm, and the stirring duration is 20 minutes. By controlling the heating temperature and time, avoid overheating or insufficient heating of the resin, so as to affect the quality of the mixture.

[0041] In step seven, the mixture is tested for rheological properties by a rheometer. The rheometer is used to detect the flowability of the mixture, so as to ensure the flowability of the mixture for subsequent construction or molding.

[0042] In step eight, morphological characterization analysis is performed by scanning electron microscopy (SEM), and performance tests include compressive strength, crack resistance and durability tests. Through morphological characterization analysis, the microstructure and constituent components of the mixture are understood.

[0043] In summary: the present application is by ultra-fine fly ash, limestone powder, silicon powder, resin, polymer fiber and additives together, its mineral powder particles are finer, the surface area is larger, so its activity is higher, can better promote the cement hydration reaction, improve the early strength development and long-term performance of concrete, and its activity is higher, therefore can greatly improve its in concrete, reduce the cement content, thereby reducing the cost of concrete, reduce resource consumption, and the mineral admixture is compatible with cement, aggregate and other concrete raw materials, easy to use, excellent construction performance.

[0044] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above examples, and the above examples and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection claimed by the present application is limited by the appended claims and their equivalents.

Claims

1. An ultrafine fly ash-based composite mineral admixture, characterized in that: The composition comprises the following components in the following weight ratios: Ultrafine fly ash 60-80%, limestone powder 5-15%, silica fume 5-10%, resin 5-10%, polymer fiber 1-3%, additives 2%; The auxiliary agent includes 50% of plasticizer, 20% of anti-cracking agent, 15% of fast curing agent, 10% of waterproofing agent and 5% of reinforcing agent.

2. The ultrafine fly ash-based composite mineral admixture according to claim 1, characterized in that: The specific proportions of the components are: 60% ultrafine fly ash, 15% limestone powder, 10% silica fume, 10% resin, 3% polymer fiber, and 2% additives.

3. The ultrafine fly ash-based composite mineral admixture according to claim 1, characterized in that: The specific proportions of the components are: 70% ultrafine fly ash, 10% limestone powder, 10% silica fume, 5% resin, 3% polymer fiber, and 2% additives.

4. The ultrafine fly ash-based composite mineral admixture according to claim 1, characterized in that: The specific proportions of the components are: 80% ultrafine fly ash, 7% limestone powder, 5% silica fume, 5% resin, 1% polymer fiber, and 2% additives.

5. A method for preparing an ultrafine fly ash-based composite mineral admixture according to any one of claims 1 to 4, characterized in that: The steps include: Step 1: Material preparation: Prepare ultrafine fly ash, limestone powder, silica fume, resin, polymer fiber and additives, accurately weigh each material and place them in numbered containers respectively; Step 2: Pre-treating the resin: Heat the resin in a heating container until it is completely liquefied; Step 3: Component mixing: Add ultrafine fly ash, limestone powder and silica fume into the mixing tank according to the formula ratio, start the agitator to mix thoroughly; Step 4: Add resin: Slowly add the pre-treated resin into the mixing tank while continuously stirring and mixing. Record the resin addition time and speed. Step 5: Add additives: Add the additives to the mixture one by one according to the formula ratio. Stir thoroughly after each addition and record the time and order of adding each additive. Step 6: Adding polymer fibers: Sprinkle the polymer fibers evenly on the surface of the mixture in the mixing tank, start the stirrer, and mix the polymer fibers and the mixture thoroughly; Step 7: Adjust the mixture: gradually adjust the fluidity and moisture content of the mixture by adding water; Step 8: Performance analysis: Obtain mixture samples for morphological characterization analysis and performance testing.

6. The method for preparing an ultrafine fly ash-based composite mineral admixture according to claim 5, characterized in that: The heating temperature in the second step is 60°C - 80°C, the speed of the stirrer in the third step is 200 rpm, and the stirring duration is 20 minutes.

7. The method for preparing an ultrafine fly ash-based composite mineral admixture according to claim 5, characterized in that: In the step seven, the rheological properties of the mixture are tested by a rheometer.

8. The method for preparing an ultrafine fly ash-based composite mineral admixture according to claim 5, characterized in that: In the step eight, morphological characterization analysis is performed by scanning electron microscopy (SEM) observation, and the performance test includes compressive strength, crack resistance and durability test.