CN111233364B - Composite mineral admixture, preparation method thereof and artificial sand concrete material containing composite mineral admixture - Google Patents
Composite mineral admixture, preparation method thereof and artificial sand concrete material containing composite mineral admixture Download PDFInfo
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- CN111233364B CN111233364B CN202010149766.1A CN202010149766A CN111233364B CN 111233364 B CN111233364 B CN 111233364B CN 202010149766 A CN202010149766 A CN 202010149766A CN 111233364 B CN111233364 B CN 111233364B
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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
- 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
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/48—Clinker treatment
- C04B7/52—Grinding ; After-treatment of ground cement
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a composite mineral admixture, a preparation method thereof and an artificial sand concrete material containing the composite mineral admixture. The grinding raw materials of limestone powder, volcanic ash and granulated blast furnace slag are conveyed into a ball mill in proportion, and simultaneously, a composite grinding aid accounting for 0.1-0.2 percent of the total mass of the grinding raw materials is added, the materials are ground until the screen residue of a 0.045mm screen is less than or equal to 12 percent, and the specific surface area is controlled to be 450-500 m2And/kg, namely preparing the composite mineral admixture. According to the invention, limestone powder, natural volcanic ash and slag are used as raw materials, and a proper amount of composite grinding aid is added, so that the performance of the artificial sand concrete can be effectively improved, and the production cost is reduced.
Description
Technical Field
The invention relates to a composite mineral admixture, a preparation method thereof and an artificial sand concrete material containing the composite mineral admixture.
Background
The concrete is artificial stone which is prepared by taking cement as a main cementing material, adding water, sand, stones and chemical additives and mineral admixtures if necessary, mixing the materials according to a proper proportion, uniformly stirring, densely molding, curing and hardening.
In recent years, as governments increase the supervision of environmental protection, river sand and desalinated sea sand used in concrete are increasingly deficient and gradually replaced by artificial sand. The artificial sand is limited by a processing technology, cannot be in the same particle shape as natural sand, and has high stone powder content, so that concrete containing the artificial sand has poor fluidity, large slump loss and easy cracking. It is difficult to improve the above problems from the aspect of the admixture alone.
In order to improve the concrete properties, attempts have been made to improve the concrete properties by improving mineral admixtures. The addition of the fly ash can reduce the early strength, thereby increasing the early cracks; although the slag powder and the silica fume have small influence on the early strength, the shrinkage is increased, the drying shrinkage cracks are easy to generate, and the superposition effect of the diversified combination of the mineral admixture cannot be exerted. Because of the above-mentioned shortcomings associated with the use of a single variety of mineral admixtures to improve the performance of concrete, composite admixtures have been used.
From the perspective of environmental protection, the composite mineral admixture fully utilizes various industrial waste residues, and reduces environmental pollution; from the economic aspect, the concrete doped with the composite mineral admixture can directly reduce the production cost; from the aspect of concrete quality, because the added fine particles of the composite mineral admixture improve the gradation of fine aggregate, the concrete is more compact, the hydration heat of cement is reduced, and the method plays a great role in improving the durability of the concrete.
For example, the invention patent of China with the publication number of CN102757193A discloses a composite admixture for concrete, which is prepared from fly ash, silica fume, granulated blast furnace slag powder, anhydrous sodium sulphate, hydroxypropyl methyl cellulose, UEA expanding agent, polycarboxylic acid water reducing agent, citric acid, boric acid, sodium gluconate, sodium phosphate, sodium tartrate, calcium carbonate, lithium carbonate, calcium formate, calcium acetate and cellulose ether. The admixture can improve the strength and workability of concrete, but has complex components and high cost.
There is a need in the art for an admixture that is simple in composition, easy to prepare and capable of improving the performance of concrete, and concrete comprising the same.
Disclosure of Invention
In view of the above, the present invention provides a composite mineral admixture, a preparation method thereof and an artificial sand concrete material containing the composite mineral admixture, which are directed to the problems of the prior art.
The first purpose of the invention is to provide a preparation method of a composite mineral admixture, which comprises the steps of conveying ground raw materials of limestone powder, volcanic ash and granulated blast furnace slag into a ball mill in proportion, simultaneously adding a composite grinding aid accounting for 0.1-0.2% of the total mass of the ground raw materials, grinding until the residue of a 0.045mm sieve is less than or equal to 12%, and controlling the specific surface area to be 450-500 m2Per kg, namely preparing the composite mineral admixture;
the grinding raw materials comprise the following components in percentage by mass: 30-50% of limestone powder, 30-40% of volcanic ash and 10-30% of granulated blast furnace slag;
the composite grinding aid is prepared by stirring and dissolving diethanol monoisopropanolamine, glycerol, a reinforcing agent, a dispersing agent and water at a weight ratio of 12-16: 6-10: 3-7: 60-70 at normal temperature.
Preferably, the grinding raw materials comprise the following components in percentage by mass: 35-45% of limestone powder, 30-35% of volcanic ash and 20-30% of granulated blast furnace slag.
Preferably, the composite grinding aid is prepared by stirring and dissolving diethanol monoisopropanolamine, glycerol, a reinforcing agent, a dispersing agent and water at a weight ratio of 14:8:8:5:65 at normal temperature.
Preferably, the limestone powder is powder of limestone ore waste, stone chips and limestone; the volcanic ash is natural volcanic ash; the granulated blast furnace slag is industrial waste slag which is subjected to high-temperature calcination and quenching during steel making.
Preferably, the diethanol monoisopropanolamine is modified alcohol amine with the solid content of 80%, the glycerol is commercially available glycerol with the solid content of 80%, the reinforcing agent is Sodium Tripolyphosphate (STPP), and the molecular weight of the dispersing agent is K30 polyvinylpyrrolidone (PVP).
Preferably, the particle size of the limestone powder is less than or equal to 5 mm.
Preferably, before grinding, the limestone powder, the volcanic ash and the granulated blast furnace slag are respectively dried until the moisture is below 2 percent.
The second purpose of the invention is to provide a composite mineral admixture prepared by the method.
The third purpose of the invention is to provide an artificial sand concrete material adopting the composite mineral admixture; the artificial sand concrete material comprises the following components in percentage by weight:
285-295 kg/m of cement3Artificial sand 681-723 kg/m31021-1083 kg/m of broken stone394-98 kg/m of composite mineral admixture3168-172 kg/m of water38.7-8.9 kg/m of additive3。
Preferably, the artificial sand concrete material comprises the following components in the following content:
290kg/m cement3702kg/m of artificial sand31052kg/m of crushed stone396kg/m of composite mineral admixture3170kg/m of water38.8kg/m of additive3。
Preferably, the cement is PII 42.5R cement.
The invention comprehensively considers the factors of activity, grinding difficulty, specific surface area and the like of raw materials, and selects the granulated blast furnace slag, the limestone powder and the volcanic ash as grinding raw materials, so that the composite mineral admixture is convenient to prepare and has higher activity and good filling effect. The limestone powder is mainly calcium carbonate, and is easy to grind. The natural volcanic ash is an active material, and a certain amount of active silica, active alumina and the like exist, and can react with calcium oxide at normal temperature and in the presence of water to generate a hydraulic cementing material. The main component of the granulated blast furnace slag is aluminosilicate, and the granulated blast furnace slag has high activity after being excited by alkali or sulfate, but the granulated blast furnace slag is difficult to grind. The grinding difficulty of the volcanic ash is between that of limestone powder and granulated blast furnace slag. When the three materials are mixed and ground, the specific surface area is the largest by limestone powder, and then volcanic ash is used, and the smallest is slag; the limestone powder fills gaps of the volcanic ash, and the volcanic ash fills gaps of the slag powder.
The mixing of the superfine particles improves the gradation of the rubber material, increases the cohesiveness and the water retention, and prevents segregation and bleeding, thereby achieving the purpose of improving the problems of poor fluidity and large slump loss caused by using artificial sand. Because the cement consumption is reduced, the internal temperature of the concrete can be reduced, and the temperature rise cracks of the concrete are effectively reduced. The composite mineral admixture has large specific surface area, and can well fill gaps among artificial sand particles to compact concrete, thereby overcoming the defects caused by using artificial sand.
The characteristics of the components of the grinding aid are comprehensively considered, the composite grinding aid disclosed by the invention takes water as a solvent, the diethanol monoisopropanolamine has good compatibility with other alcohols and lipids, the early strength and the later strength of the composite mineral admixture can be improved, and the glycerol is used as a plasticizer and is doped with a surface lubricating effect; the sodium tripolyphosphate has the characteristics of good complexation, dispersion and the like; the polyvinyl pyrrolidone is a good high molecular surfactant and plays roles in dispersing, emulsifying and dissolving. The composite grinding aid has better dispersion effect by adopting polyvinylpyrrolidone, so that the prepared artificial sand concrete has better workability and smaller slump loss in 2 hours.
According to the invention, limestone powder, natural volcanic ash and slag are used as raw materials, a proper amount of composite grinding aid is added, and the particle composition of the composite mineral admixture is changed, so that the problems of poor fluidity, large slump loss and cracking reduction caused by using artificial sand are solved, the excellent combination effect of the characteristics of each waste residue is fully exerted, the performance defect of a single variety is overcome, the performance of artificial sand concrete can be effectively improved, and the production cost is reduced. The activity indexes of the composite mineral admixture for 7 days and 28 days are higher than the requirement of the first-level composite admixture in JG/T486-2015 concrete composite admixture, the strength of the artificial sand concrete can be improved, the production cost is reduced, and the social and economic benefits are better.
The composite mineral admixture is the multi-element composite of mineral admixtures, is the composite application of chemical properties among various admixtures, reasonably matches the activity and the inertia, and has good effect of improving the performance of concrete. When a plurality of mineral admixtures are used in a compounding way, the inert admixtures can play a 'micronucleus' effect and act like 'crystal seeds', so that the active admixtures can be excited, and the hydration reaction can be rapidly and smoothly carried out.
The composite mineral admixture of the invention can completely replace mineral powder, fly ash, silica fume and other single mineral admixtures and part of cement. When the composite mineral admixture replaces coal ash in an equivalent manner, the strength of concrete prepared by the composite mineral admixture is higher than that of concrete prepared by using coal ash; when partial cement is replaced and coal ash is completely replaced, the strength of the prepared concrete can keep the same effect as that of the concrete prepared by singly using the coal ash. The composite mineral admixture can be used for producing commercial artificial sand concrete with strength grade of C10-C60.
The components in the composite mineral admixture prepared by the invention can play a synergistic effect, a micro-aggregate effect and a pozzolanic activity effect, and have the effects of reducing the production cost of artificial sand concrete, improving the construction performance, reducing the hydration heat, reducing the generation of cracks and the like. The strength of the artificial sand concrete prepared by the method is generally improved by more than 5MPa in 28 days, the cement consumption can be reduced, the production cost can be reduced, and the method has the advantages of good economic benefit and social benefit.
Compared with the existing mineral admixtures of other types, the composite mineral admixture prepared by the invention has the advantages of easily available raw materials, low price, capability of replacing high-quality fly ash and slag powder with higher price in common civil buildings, consumption of industrial wastes and effective improvement of the environment.
The preparation method of the composite mineral admixture has the advantages of simple grinding process, high production efficiency and low production cost.
Detailed Description
The present invention will be described in further detail with reference to examples.
The production places and the types of the raw materials used in the embodiment of the invention are as follows:
limestone powder, waste stone chips and limestone powder generated by mining limestone ore in Guangdong English De limestone mine.
Volcanic ash, natural volcanic ash mine site of guangdong english de.
Granulated blast furnace slag, industrial waste slag produced in steel making in Guangdong Shaosuan steel plant.
The cement P.II 42.5R is three kinds of cement produced by Taiwan cement company, Heilong cement company and Hongfeng cement company.
Fly ash, class II, produced by Guangzhou, Hui Yi building materials Co.
Artificial sand, medium sand in zone II with fineness modulus of 2.7, produced by mining development investment of Guangdong Qingyuan valley city, Inc.
And (4) crushing stones with the particle size of 5-25 mm, and producing Guangdong Qingyuan Sanshengshan stone field.
The K-HCA-R additive is a polycarboxylic acid high-efficiency water reducing agent, is produced by Cleister building materials science and technology Limited company in Guangzhou, and has the concentration of 10 percent.
The diethanol monoisopropanolamine is a modified alcohol amine with the solid content of 80 percent sold in the market.
The glycerol is commercially available with a solid content of 80%.
The reinforcing agent is Sodium Tripolyphosphate (STPP) produced by 96 percent of Weifang Huabo chemical industry Co.
The molecular weight of the dispersant is polyvinyl pyrrolidone (PVP) produced by K30 Henan New open source company.
The water is local tap water.
Example 1
1. The ground raw materials are dried according to the proportion, namely 40 percent of limestone powder, 30 percent of volcanic ash and 30 percent of granulated blast furnace slag are respectively dried, and the moisture of the ground materials is controlled to be below 2 percent.
If the water content of the materials to be ground is too high, static electricity can be generated when the steel balls rub against each other, so that the phenomenon of ball wrapping (commonly called saturated grinding) is caused, the machine-hour yield is low, the power consumption is high, and the quality of the ground steel can be abnormal (such as the phenomenon of quick setting easily occurs when the steel balls are used in concrete). Generally, the water content of limestone powder before being dried is 2-3%, the water content of slag is 8-15%, and the water content of volcanic ash is 15-20%. The grinding efficiency can be improved by controlling the grinding water content to be less than or equal to 2 percent, and the stable composite mineral admixture is obtained.
2. The composite grinding aid used by the invention is prepared by stirring and dissolving diethanol monoisopropanolamine, glycerol, a reinforcing agent, a dispersing agent and water according to the weight ratio of 14:8:8:5:65 at normal temperature.
3. Conveying the powder grinding raw material dried in the step 1 into a ball mill, simultaneously adding 0.1% of the total mass of the powder grinding raw material into the composite grinding aid prepared in the step 2, grinding until the screen residue of a 0.045mm screen is less than or equal to 12%, and controlling the specific surface area to be 450-500 m2The mineral complex admixture required by the embodiment of the invention is prepared according to the kg.
The performance of the composite mineral blend prepared in this example versus fly ash is shown in Table 1 below.
TABLE 1 comparison of the properties of the composite mineral admixture prepared in this example with fly ash
As can be seen from Table 1, compared with fly ash, the composite mineral admixture of the invention has larger specific surface area, higher activity index in 7 days and 28 days, better fluidity ratio and higher increase ratio of the compressive strength of the mortar, and can completely replace the fly ash with the same amount.
Example 2
The same amount of the mineral composite admixture obtained in example 1 was used in place of fly ash for concrete test (strength grade C30). The admixture used in comparative groups 1-3 was fly ash, and the admixture used in experimental groups 1-3 was the complex mineral admixture prepared in example 1. The contents of the concrete components in this example are shown in Table 2.
TABLE 2 concrete component content (unit: kg/m)3)
| Numbering | Tai mud cement | Sea snail cement | Hongfeng cement | Artificial sand | Crushing stone | Blending material | Water (W) | Additive agent |
| Comparative group 1 | 290 | / | / | 702 | 1052 | 96 | 170 | 8.88 |
| Comparative group 2 | / | 290 | / | 702 | 1052 | 96 | 170 | 8.88 |
| Comparative group 3 | / | / | 290 | 702 | 1052 | 96 | 170 | 8.88 |
| EXAMPLE 1 group 1 | 290 | / | / | 702 | 1052 | 96 | 170 | 8.88 |
| EXAMPLE 2 group | / | 290 | / | 702 | 1052 | 96 | 170 | 8.88 |
| EXAMPLE 3 group | / | / | 290 | 702 | 1052 | 96 | 170 | 8.88 |
The comparative results are shown in Table 3. According to the test result data in the table 3, the concrete using the artificial sand has little influence on the initial slump, the 2-hour slump loss and the concrete strength of the artificial sand concrete by using different varieties of cement, but after the artificial sand concrete is doped with the composite mineral admixture of the embodiment, the workability of the artificial sand concrete is good, no bleeding phenomenon exists, the initial slump is increased, the 2-hour slump loss is reduced, and the 28-day strength is generally improved by more than 5 MPa.
TABLE 3 comparison table of concrete effect of this example
Example 3
This example prepares concrete of C30 strength grade by replacing fly ash with the composite mineral admixture of the present invention and replacing 5%, 10%, 15% cement and examines its performance. In this example, P.II 42.5R cement manufactured by Taiwan cement corporation was used as cement.
TABLE 4 content of concrete components (unit: kg/m)3)
As shown in Table 5, when the composite mineral admixture of the present invention was used in place of only fly ash completely, the strength of the resulting concrete was higher than that of the concrete using fly ash, and the strength of the concrete decreased with increasing proportion of the cement replaced, while the strength of the concrete was still close to that of the concrete using only fly ash as the admixture when the fly ash and 15% of the cement were completely replaced. Therefore, the composite mineral admixture of the invention can completely replace mineral powder, fly ash, silica fume and other single mineral admixtures and part of cement.
TABLE 5 comparative table of concrete effect of this example
The above examples are merely representative of a few embodiments of the present invention, and although the description is specific and detailed, the present invention should not be construed as limited the scope of the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (9)
1. A preparation method of a composite mineral admixture is characterized by comprising the following steps: the grinding raw materials of limestone powder, volcanic ash and granulated blast furnace slag are conveyed into a ball mill in proportion, and simultaneously, a composite grinding aid accounting for 0.1-0.2 percent of the total mass of the grinding raw materials is added, the materials are ground until the screen residue of a 0.045mm screen is less than or equal to 12 percent, and the specific surface area is controlled to be 450-500 m2The mineral complex admixture is prepared after the addition of the mineral complex;
the grinding raw materials comprise the following components in percentage by mass: 30-50% of limestone powder, 30-40% of volcanic ash and 10-30% of granulated blast furnace slag;
the composite grinding aid is prepared by stirring and dissolving diethanol monoisopropanolamine, glycerol, a reinforcing agent, a dispersing agent and water at a weight ratio of 12-16: 6-10: 3-7: 60-70 at normal temperature, wherein the reinforcing agent is sodium tripolyphosphate, and the dispersing agent is polyvinylpyrrolidone with a molecular weight of K30.
2. The method of producing a complex mineral admixture according to claim 1, wherein: the grinding raw materials comprise the following components in percentage by mass: 35-45% of limestone powder, 30-35% of volcanic ash and 20-30% of granulated blast furnace slag.
3. The method for producing a complex mineral admixture according to claim 1 or 2, characterized in that: the limestone powder is powder of waste stone chips generated by exploiting limestone ores; the volcanic ash is natural volcanic ash; the granulated blast furnace slag is industrial waste slag which is subjected to high-temperature calcination and quenching during steel making.
4. The method for producing a complex mineral admixture according to claim 1 or 2, characterized in that: the composite grinding aid is prepared by stirring and dissolving diethanol monoisopropanolamine, glycerol, a reinforcing agent, a dispersing agent and water at a weight ratio of 14:8:8:5:65 at normal temperature.
5. The method of producing a complex mineral admixture according to claim 4, wherein: the diethanol monoisopropanolamine is modified alcohol amine with the solid content of 80%, and the glycerol is commercially available glycerol with the solid content of 80%.
6. The method of producing a complex mineral admixture according to claim 1, wherein: before grinding, the limestone powder, the volcanic ash and the granulated blast furnace slag are respectively dried until the moisture is below 2 percent.
7. A complex mineral admixture is characterized in that: the mineral composite admixture as defined in any one of claims 1 to 6.
8. An artificial sand concrete material using the complex mineral admixture according to claim 7, characterized in that: comprises the following components in the following content:
285-295 kg/m of cement3Artificial sand 681-723 kg/m31021-1083 kg/m of broken stone394-98 kg/m of composite mineral admixture3168-172 kg/m of water38.7-8.9 kg/m of additive3。
9. The artificial sand concrete material according to claim 8, wherein: comprises the following components in the following content:
290kg/m cement3702kg/m of artificial sand31052kg/m of crushed stone396kg/m of composite mineral admixture3170kg/m of water38.8kg/m of additive3。
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| CN112121884A (en) * | 2020-09-11 | 2020-12-25 | 新疆水利水电科学研究院 | Preparation method of concrete mineral admixture based on natural volcanic rock |
| CN113149509A (en) * | 2021-04-21 | 2021-07-23 | 湖北荣锐新材料有限公司 | Method for producing filling material by using commercial concrete active mineral admixture instead of traditional fly ash |
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| CN115490449A (en) * | 2022-10-07 | 2022-12-20 | 江苏金木土科技有限公司 | Preparation method of superfine mineral admixture |
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