CN113526891A - High-strength high-performance mineral admixture for concrete and production method thereof - Google Patents
High-strength high-performance mineral admixture for concrete and production method thereof Download PDFInfo
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- CN113526891A CN113526891A CN202010308472.9A CN202010308472A CN113526891A CN 113526891 A CN113526891 A CN 113526891A CN 202010308472 A CN202010308472 A CN 202010308472A CN 113526891 A CN113526891 A CN 113526891A
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- mineral admixture
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The high-strength high-performance mineral admixture for high-strength high-performance concrete is characterized by that 97% of total weight of said high-strength high-performance mineral admixture is less than 20 micrometers, and the grinding process uses closed-circuit microsphere tube mill with superfine powder-selecting machine, and said production method has the advantages of industrial feasibility, energy-saving property, etc..
Description
Technical Field
The invention relates to the field of building materials, in particular to a high-strength high-performance mineral admixture for high-strength high-performance concrete and a production method thereof.
Background
It is known that the concrete can be mixed with mineral admixture meeting the relevant national standard for reducing the cost of the concrete and comprehensively utilizing industrial waste slag, but after the mineral admixture is mixed into the concrete by the conventional method, the concrete has certain properties, such as: the strength, bleeding property, segregation resistance, frost resistance, carbonization resistance and the like are reduced to different degrees, and the proportion of the mineral admixture replacing Portland cement is lower.
Disclosure of Invention
The invention aims to solve the problem of providing a high-strength high-performance mineral admixture which has better contribution to all comprehensive properties (workability, durability and strength) of high-strength high-performance concrete than portland cement, so as to solve the technical problems of the prior art that the performance of the concrete is reduced and the proportion of replacing the portland cement is low due to the addition of the mineral admixture.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a high-strength high-performance mineral admixture for high-strength high-performance concrete, 97% of the total weight of the high-strength high-performance mineral admixture has a particle size of less than 20 microns.
A high-strength high-performance additive for mineral is prepared from tube mill, bag dust collector, exhaust fan, and metering conveyer, and features that the tube mill has superfine powder separator and its grinding body is made of steel or ceramic microspheres or micro-or microsphere and forge.
A production method of a high-strength high-performance mineral admixture is characterized in that during grinding, water aqua of polycarboxylic acid high-efficiency water-reducing grinding aid is sprayed into a mill under high pressure, wherein the water aqua accounts for 0.00-1.00 percent (solid content) of the total weight of the high-strength high-performance mineral admixture in the mill.
The invention has the beneficial effects that:
the chemical activity of any kind of mineral admixture is lower than that of silicate cement clinker, and in the traditional cement production, the energy is saved in order to reach the same cement strength and reduce the grain size of the mineral admixture as compared with the grain size of the cement clinker. However, various unexpected effects were found by separately grinding the mineral admixture to below (D97 =20 μm) and mixing it with portland cement.
1. The mineral admixture with small particle size greatly reduces the bleeding and segregation of concrete, greatly improves the filling property of the concrete, and the properties are the construction requirements necessary for pumping self-leveling concrete and the properties which cannot be realized by the traditional Portland cement.
2. The mineral admixture with small particle size is filled in the gaps of the silicate clinker with large particle size, occupies the space occupied by the original water, improves the sphericity of the mineral admixture with small particle size, increases the lubricating effect of cement paste, consequently, the water reducing rate of the cement mortar saturation point is improved to more than 40%, the water consumption of the concrete saturation point is reduced to less than 120kg/m, and the performance that the traditional silicate cement can not realize is realized.
3. The mineral admixture with small particle size meets four conditions for improving the concrete aggregate interface: 1 reducing the surface tension of water, 2 increasing the viscosity of concrete, 3 having a certain proportion of calcareous material and siliceous material, 4 having substantially the same hydration rate of calcareous material and siliceous material, which is also a property that cannot be realized by the traditional portland cement.
4. Because of the improvement of the concrete constructability, the reduction of the single water consumption and the improvement of the interface, the 3-day compressive strength of the high-performance concrete is improved by 3-4 times, the 28-day compressive strength is improved by more than 2 times, the concrete strength exceeds the aggregate strength, and the strength limit of the concrete is reached.
5. Because the water consumption of the concrete is reduced, the interface is improved, the calcium-silicon ratio is reasonable, the strength and the impermeability of the set cement are higher than those of the aggregate, the durability of the concrete is higher than that of the aggregate, and the concrete is realized for thousands of years.
When the powder is ground into superfine powder (for example, the volcanic ash is ground to be below (D97 =40 microns)), the conventional grinding medium has overlarge size to cause excessive grinding force, so that the phenomena of 'agglomeration and ball sticking' and even the phenomena of wrapping the grinding medium, sticking a lining plate, a grate plate and the like occur, the further reduction of the particle size is prevented, the industrial production is difficult to carry out, and the problem can be solved to a certain extent by using (steel or ceramic) microsphere forging, wherein the maximum diameter is less than 15 mm. If the particle size is further reduced (for example, volcanic ash is ground to be below (D97 =20 microns)), no matter how large the power consumption is, the particle size of the material can not be reduced any more, and the closed-circuit grinding system with the superfine powder concentrator can be used for solving the problem. If the particle size is further reduced (for example, the volcanic ash is ground to be below (D97 =10 microns)), the grinding efficiency is rapidly reduced, the grinding efficiency can be greatly improved by using the water aqua of the polycarboxylic acid high-efficiency water-reducing grinding aid which is 0-1.0% (solid content) of the total weight of the high-strength high-performance mineral admixture sprayed into the mill during grinding under high pressure, and the power consumption of grinding can be reduced by more than 50% when the volcanic ash is ground to be below the particle size (D97 =10 microns).
Drawings
FIG. 1 is a process flow chart of the production method of the high-strength high-performance mineral admixture.
In the figure of 1, 1-n of raw material grinding material storage tank of mineral admixture, 2, storage tank of polycarboxylic acid high-efficiency water-reducing grinding aid water agent, 3, metering high-pressure spraying device, 4, powder-returning metering conveyor, 5, superfine powder concentrator, 6, tube mill, 7, bag dust collector, 8, exhaust fan, 9 and finished product-high-strength high-performance mineral admixture.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more apparent, the present invention is further described in detail below with reference to specific embodiments.
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following description is made with reference to fig. 1 of the drawings in the above description:
in the attached drawing of the specification, 1-n are reservoirs below n kinds of raw material grinding materials (K97 =100 microns), 2 is a storage tank for a polycarboxylic acid high-efficiency water reducing grinding aid aqueous solution, 3 is a metering high-pressure spraying device, 4 is a powder returning metering conveyor, 5 is a tube mill, microspheres (steel or ceramic) or micro-forging or microsphere and forging are arranged in the tube mill, the maximum diameter of the microsphere forging is 15mm, 12mm and 10mm can be selected according to the maximum particle size of the grinding materials, 6 is an ultrafine powder concentrator, 7 is a bag dust collector, 8 is an exhaust fan, and 9 is a finished product, namely a high-strength high-performance mineral additive. During industrial production, according to local resource conditions and quality requirements, the selected raw materials are selected to be below a fine grinding material (K97 =100 micrometers) which meets any one or more than one of national standards of mineral admixtures in China, the raw materials are conveyed into a superfine powder separator by a conveyor to be separated after being metered according to a formula, the separated finished products enter a bag dust collector to be collected, and the collected products are the high-strength high-performance mineral admixtures. And returning the coarse powder separated by the superfine powder separator to the tube mill for continuous grinding through a powder returning and metering conveyor, separating the ground material through air suction into the superfine powder separator, and repeating the closed cycle process until the ground material is ground to the required particle size. And the water aqua of the polycarboxylic acid high-efficiency water-reducing grinding aid can be sprayed into the tube mill at high pressure by 0.00-1.00 percent (solid content) according to the requirements of the grinding efficiency and the product quality, so that the grinding efficiency and the product quality are further improved.
A plurality of groups of different raw materials of the mineral admixture are arranged, the raw materials of the mineral admixture are prepared into the mineral admixture meeting the requirements according to the method provided by the application, the cement is prepared according to the same method, the performance of the cement is tested, and the data is recorded to form a table-1.
High-strength high-performance environment-friendly cement prepared from No. 78 high-strength high-performance mineral admixture in the table-1 and traditional portland cement (the reference number is recorded as C) are respectively prepared into concrete, and corresponding concrete performance parameters are recorded to prepare a table-2.
With regard to the above tables-1 and-2, points to be described therein are:
1. research tests show that in cement paste, mortar and concrete, with the increase of the water reducing agent, a point exists at which the water reducing rate is not reduced obviously after the water reducing agent is added, the point is called a "saturation point", the water reducing rate at the moment is called a "saturation point water reducing rate", the adding amount at the moment is called a "saturation point adding amount", the water demand at the moment is called a "saturation point water demand", the water demand ratio at the moment is called a "saturation point water demand ratio", and the standard cement mortar flow rate water demand ratio at the moment is called a "standard cement mortar flow rate saturation point water demand ratio".
2. The proportion of portland cement used for providing experimental data (the label is recorded as C) is 95% of clinker and 5% of gypsum (D97 =60 microns), the 3-day compressive strength is 30MPa, the 28-day compressive strength is 50MPa, the blending amount of the saturation point of the polycarboxylic acid high-efficiency water reducing agent of the portland cement is 0.2% (solid content), the water demand ratio of the saturation point is 0.35, the water demand of the saturation point is added to form the three-day compressive strength of 60MPa, and the 28-day compressive strength of 80 MPa.
3. The application provides experimental data that various cement compressive strengths are formed by adding water according to the water demand of standard fluidity (180 mm-220 mm) of cement mortar.
4. The application provides experimental data that all cement proportions are 50% of Portland cement and 50% of mineral admixture.
5. As used herein, (D97 =20 microns) means less than 20 microns at 97% by weight, (D97 =5 microns) means less than 5 microns at 97% by weight, and so on.
6. It should be noted that the mineral admixture raw materials referred to herein include, but are not limited to, the above raw materials, and all the raw materials of mineral admixture (such as slag, steel slag, metallurgical slag, phosphorous slag, calcium-enriched liquid slag, circulating fluidized bed desulfurization slag, ash, burnt gangue, limestone, basalt, natural pozzolan, fly ash, slag, burnt clay, harmless municipal refuse slag, construction waste slag, etc.) meeting the standards of mineral admixture used in concrete or cement in the country can be used as the raw materials of high-strength high-performance mineral admixture. The raw material of the high-strength high-performance mineral admixture can be prepared from one or more than one of the raw materials according to any proportion, but the composite effect of two or more than two is better.
Reading the data in the table-1, comparing the cement with the serial numbers 1, 7, 13, 19, 25 and 28, the cement has different raw materials, the same particle size, the same water requirement ratio and different cement strength, but the absolute value difference is not large, the maximum difference of the strength in 3 days is 20-10 =10mpa, and the maximum difference of the strength in 28 days is 50-20 =30mpa, which is determined by the different chemical activities of the raw materials. Compared with the high-performance environment-friendly cement with the comparison numbers of 6, 12, 18, 24, 27 and 30-85, no matter what raw materials are one or more, the raw materials are compounded in any proportion, and the 28-day strength of the high-strength high-performance environment-friendly cement can be more than 120mpa and reaches the cement strength limit as long as the particle size of the raw materials is adjusted and the addition amount of the saturation point of the polycarboxylic acid high-efficiency water reducing agent is adjusted to ensure that the water demand ratio of the standard fluidity (180-220 mm) of the mortar to the saturation point is less than 0.25.
Reading the data in table-2, comparing the concrete prepared by the traditional portland cement with the serial number c and the concrete prepared by the high-strength high-performance environment-friendly cement with the serial number 78, it can be seen that the traditional portland cement with the serial number c cannot meet the construction requirement of the pumping self-leveling concrete, and the durability cannot meet all the performance requirements of the national standard on the concrete with the durability of 50 years under the most severe environmental conditions. The serial number 78 high-strength high-performance environment-friendly cement can completely meet the construction requirement of pumping self-leveling concrete due to the small-particle-size high-strength high-performance mineral admixture, and the small-particle-size high-strength high-performance mineral admixture is filled in gaps of large-particle-size clinker, so that the sphericity of the small-particle-size high-strength high-performance mineral admixture is improved, the lubrication effect of cement paste is increased, the single-use water consumption of the concrete is reduced by (160-120) =40kg, the 28-day strength of the concrete is increased by (123-76) =47mpa, the concrete strength exceeds the aggregate strength, the concrete strength limit is reached, and the concrete durability exceeds the whole performance requirement of national standards on the concrete with the durability of 100 years under the most severe environmental conditions.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
TABLE-1
Watch-2
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (3)
1. A high-strength high-performance mineral admixture for concrete is characterized in that: 97 percent of the total weight of the high-strength high-performance mineral admixture has the particle size of less than 20 microns.
2. A high-strength high-performance mineral admixture for concrete according to claim 1, which is produced by a method comprising a tube mill, a bag dust collector, an exhaust fan, a dust return metering conveyor and the like, wherein: the tube mill is a closed system with an ultrafine powder concentrator, and the grinding body of the tube mill uses (steel or ceramic) microspheres or micro-forging or microspheres and micro-forging.
3. The method for producing a high-strength high-performance mineral admixture for concrete according to claim 2, wherein: during grinding, the water aqua of the polycarboxylic acid high-efficiency water-reducing grinding aid is sprayed into the mill under high pressure, wherein the water aqua accounts for 0.00-1.00 percent (solid content) of the total weight of the high-strength high-performance mineral admixture in the mill.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114105564A (en) * | 2021-12-06 | 2022-03-01 | 桂林理工大学 | High-corrosion-resistance low-shrinkage concrete and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114105564A (en) * | 2021-12-06 | 2022-03-01 | 桂林理工大学 | High-corrosion-resistance low-shrinkage concrete and preparation method thereof |
| CN114105564B (en) * | 2021-12-06 | 2022-11-11 | 桂林理工大学 | High-corrosion-resistance low-shrinkage concrete and preparation method thereof |
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