CN109400062B - Natural volcanic ash green high-performance concrete - Google Patents
Natural volcanic ash green high-performance concrete Download PDFInfo
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- CN109400062B CN109400062B CN201811369550.5A CN201811369550A CN109400062B CN 109400062 B CN109400062 B CN 109400062B CN 201811369550 A CN201811369550 A CN 201811369550A CN 109400062 B CN109400062 B CN 109400062B
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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
- 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
- C04B20/023—Chemical treatment
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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
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a natural volcanic ash green high-performance concrete, which belongs to the technical field of green concrete and comprises the following components in parts by weight: 350 parts of Portland cement, 80-120 parts of modified natural volcanic ash, 20-40 parts of modified ultrafine fly ash, 15-25 parts of anti-freezing functional material, 500 parts of river sand, 400 parts of machine-made sand, 900 parts of crushed stone, 165 parts of water and 6-6.5 parts of water reducer. The invention can apply regional natural material natural volcanic ash to prepare green high-performance concrete in large quantity, overcomes the defect of poor compactness of common natural volcanic ash concrete by modifying the natural volcanic ash and adding modified ultrafine fly ash, and overcomes the defect of poor frost resistance of common natural volcanic ash concrete by adding a frost resistant functional material.
Description
Technical Field
The invention belongs to the technical field of green high-performance concrete, and particularly relates to natural volcanic ash green high-performance concrete.
Background
With the promotion of infrastructure construction of civil engineering, water conservancy, traffic and the like in China, the use amount of concrete as the largest civil engineering material reaches 50 billion cubic meters globally, and the addition of mineral admixtures such as fly ash, slag powder, silica fume and the like into concrete can improve the workability of the concrete, delay the hydration and heat release speed, reduce the cracking of the concrete and improve the durability of the concrete, and is one of key technologies for realizing high performance of the concrete. However, some countries or regions are developed by industry, lack of traditional mineral admixtures, and if the traditional mineral admixtures are continuously adopted, long-distance transportation is needed, so that the cost is high, the time is uncontrollable, and alternative materials are urgently needed to be searched.
The natural pozzolanic material refers to a substance formed by depositing a large amount of lava, detritus and dust sprayed by volcanoes on the ground surface or in water to form loose or light cementation, and the natural pozzolanic material has a wide range and comprises volcanic ash, pumice, zeolite rock, basalt, andesite, tuff, diatomite and the like. The natural pozzolanic materials are used as admixtures for concrete, have similar effects to artificial pozzolanic materials such as fly ash, calcined clay, calcined shale and the like, and can be used as mineral admixtures. However, because the natural volcanic ash is formed by grinding and processing natural materials, the problems of low activity, rough particle surface, poor particle shape, poor particle grading and the like exist, and in addition, the prepared natural volcanic ash concrete is often poor in compactness and poor in freezing resistance. Therefore, it is of great practical significance to develop a concrete that can overcome the above technical drawbacks.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the natural volcanic ash green high-performance concrete which can be prepared by applying regional natural material natural volcanic ash in a large amount and overcomes the defects of poor compactness and poor freezing resistance of common natural volcanic ash concrete.
In order to achieve the purpose, the invention adopts the following technical scheme:
the natural volcanic ash green high-performance concrete comprises the following components in parts by weight: 350 parts of Portland cement, 80-120 parts of modified natural volcanic ash, 20-40 parts of modified ultrafine fly ash, 15-25 parts of anti-freezing functional material, 500 parts of river sand, 400 parts of machine-made sand, 900 parts of crushed stone, 165 parts of water and 6-6.5 parts of water reducer;
the modified natural volcanic ash is subjected to modification treatment by the following method:
firstly, grinding dry natural volcanic ash with the mass fraction of 70 percent by adopting grinding equipment until the specific surface area is more than 300m2Adding 19 mass percent of sun-dried natural volcanic ash, 10 mass percent of slag powder and 1 mass percent of glycol into the mixture, and mixing and grinding the mixture until the specific surface area is more than 450m2/kg；
The modified ultrafine fly ash is modified by the following method:
99 parts by weight of fly ash and 1 part by weight of alkaline activator are addedBall milling to specific surface area greater than 1200m2Per kg, obtaining modified ultrafine fly ash; the alkali activator consists of 25 weight parts of alunite, 45 weight parts of dihydrate gypsum and 30 weight parts of anhydrous sodium sulfate;
the anti-freezing functional material is prepared from anti-freezing alloy powder and a water repellent agent according to the mass ratio of (60-80): (20-40) in proportion.
The portland cement may specifically be portland cement.
Preferably, the natural volcanic ash is volcanic cinders, pumice or tuff.
Preferably, the slag powder is S95 slag powder, the 28d activity index is more than 100%, and the specific surface area is more than 350m2/kg。
Preferably, the antifreeze alloy powder is prepared by spraying, rolling and grinding silicon dioxide, magnesium oxide, aluminum oxide and/or silicon aluminum magnesium compound at the high temperature of 1000 ℃ of 900-.
Preferably, the water repellent is a silane-based water repellent, and the content of the silane-based water repellent in the anti-freezing functional material is 25-35%.
Preferably, the fly ash is I-grade fly ash, the water demand ratio is less than 95%, and the fineness is less than 12%.
Preferably, the fineness modulus of the river sand is 2.6-3.0, and the addition amount is 440-460 parts by weight.
Preferably, the fineness modulus of the machine-made sand is 2.5-2.8, the mass content of limestone powder in the machine-made sand is 5-10%, and the crushing value of the machine-made sand is less than 10%.
Preferably, the crushed stone is 5-26.5mm continuous graded crushed stone with the density grade of more than 2600kg/m3The porosity is less than 42%, and the crushed value of the macadam is less than 6%.
Preferably, the water reducing agent is a polycarboxylate water reducing agent, the solid content of the water reducing agent is more than 25%, and the water reducing rate is more than 30%.
The invention has the beneficial effects that:
the invention provides a natural volcanic ash green high-performance concrete, which can be prepared by applying regional natural materials, namely natural volcanic ash in a large quantity, and the natural volcanic ash is modified by a method of mixing, grading and grinding the natural volcanic ash and slag powder, so that the problems of rough particle surface, poor particle shape and poor particle grading of the natural volcanic ash are solved, and the problem of calcium deficiency of chemical components of the natural volcanic ash can be solved by adding the slag powder; the modified ultrafine fly ash is added to fill gaps among natural volcanic ash particles, so that the concrete hardened slurry has better integrity, and in addition, the modified ultrafine fly ash can also improve the hydration activity of the natural volcanic ash and improve the compactness of prepared concrete; the frost resistance of the prepared concrete is improved by adding the frost resistant functional material, the frost resistant functional material is formed by mixing the frost resistant alloy powder and the hydrophobic agent, the frost resistant alloy powder can seal the gap of water entering the concrete to a certain degree, the hydrophobic agent improves the dispersibility of the frost resistant alloy powder in the concrete on one hand, and on the other hand, the frost resistance damage to the concrete structure caused by the water entering the concrete through the periphery of unhydrated natural volcanic ash particles can be reduced.
Detailed Description
The invention is further described below by means of specific embodiments. The examples are described only for the purpose of facilitating understanding and application of the invention and are not intended to limit the scope of the invention.
The invention can properly adjust the formula according to the requirements of actual engineering on the performance of concrete, and operate according to the method described in the following embodiment to prepare the natural volcanic ash green high-performance concrete meeting the performance requirements.
The main raw materials adopted are as follows:
portland cement: 42.5 Portland cement.
Natural volcanic ash: kenya natural pozzolana.
Fly ash: sold by Kunlun technologies, Inc., of Jianyan, Beijing.
River sand: sold by Kunlun technologies, Inc., of Beijing Jianyan, with a fineness modulus of 2.6.
And (3) machining sand: the Yunnan highway investment construction company Limited produces, fineness modulus 2.5, stone powder content 9%.
Crushing stone: sold by Kunlun technologies, Inc., of Jianyan, Beijing.
The antifreeze alloy powder is produced by Henan Cor-Ao-Gao New materials Co.
The hydrophobic agent is produced by Dow Corning company of America.
Polycarboxylic acid water reducing agent: KLS3 sold by Kunlun technologies, Inc., of Kyoto, was found to have a water reduction rate of 35%. And (4) testing standard:
the compressive strength of the concrete is tested according to the standard of the test method for the mechanical properties of common concrete (GB/T50081-2002).
The electric flux and the freezing resistance of the concrete are tested according to the standard of the test method for the durability and the long-term performance of the common concrete (GB/T50082-2009).
Blank comparative example:
the conventional natural volcanic ash concrete comprises the following raw materials in percentage by weight: 350kg of Portland cement, 120kg of common natural volcanic ash, 400kg of river sand, 400kg of machine-made sand, 1000kg of broken stone, 160kg of water and 6kg of water reducing agent are molded by mixing to form a test block with compressive strength, electric flux and frost resistance.
Examples 1 to 7:
a natural volcanic ash green high-performance concrete,
weighing the following raw materials in corresponding weight according to the formula shown in table 1: portland cement, modified natural volcanic ash, modified ultrafine fly ash, an anti-freezing functional material, river sand, machine-made sand, broken stone and water are mixed to form a test block with compressive strength, electric flux and anti-freezing property for testing.
The modified natural volcanic ash is subjected to modification treatment by the following method:
firstly, grinding dry natural volcanic ash with the mass fraction of 70 percent by adopting grinding equipment until the specific surface area is more than 300m2Adding 19 mass percent of sun-dried natural volcanic ash, 10 mass percent of slag powder and 1 mass percent of glycol into the mixture, and mixing and grinding the mixture until the specific surface area is more than 450m2/kg；
The modified ultrafine fly ash is modified by the following method:
putting 99 parts by weight of fly ash and 1 part by weight of alkaline activator into a ball mill, and mixing and milling until the specific surface area is more than 1200m2Per kg, namely obtaining modified ultrafine fly ash; the alkali activator consists of 25 weight parts of alunite, 45 weight parts of dihydrate gypsum and 30 weight parts of anhydrous sodium sulfate;
the antifreeze functional material is prepared by mixing 60-80 parts by weight of antifreeze alloy powder and 20-40 parts by weight of hydrophobing agent.
Wherein, the antifreezing functional material adopted in the embodiment 3 is prepared by mixing 70 parts by weight of antifreeze alloy powder and 30 parts by weight of hydrophobing agent.
The antifreezing functional material used in example 4 was a mixture of 70 parts by weight of the antifreeze alloy powder and 30 parts by weight of the hydrophobizing agent.
Example 5 adopted the antifreeze functional material of 60 parts by weight of antifreeze alloy powder and 40 parts by weight of hydrophobing agent.
Example 6 adopts the antifreeze functional material of 80 parts by weight of antifreeze alloy powder and 20 parts by weight of hydrophobing agent.
Example 7 used an antifreeze functional material of 75 parts by weight of an antifreeze alloy powder and 25 parts by weight of a hydrophobizing agent.
TABLE 1 raw materials formulation Table of the specific embodiment (unit: kg)
After the blank comparative example and the molded test blocks of examples 1-7 were subjected to standard curing for 28d, the compressive strength, electric flux and frost resistance of the concrete were tested according to the standard of the test methods for mechanical properties of ordinary concrete (GB/T50081-2002) and the standard of the test methods for durability and long-term performance of ordinary concrete (GB/T50082-2009), and the test results are shown in Table 2:
TABLE 2 Experimental data for testing of specific embodiments
From the data, the test results of the examples are compared with the comparative examples, and the modified natural volcanic ash is used for replacing the common natural volcanic ash, so that the compressive strength of the concrete is improved from 41.5MPa to 45.5MPa under the condition that the addition amount of other components is unchanged (see the comparison between the blank example and the example 1), the electric flux is reduced from 1780C to 1510C, the compactness is improved, and the frost resistance grade is improved from less than F50 to F100; the compressive strength of the concrete added with the modified ultrafine fly ash is improved, the electric flux is obviously reduced to 815 ℃ and the temperature is reduced; the frost resistance of the concrete added with the frost resistant functional material is greatly improved from F100 to F200; according to the test data of the specific embodiment, compared with the common natural volcanic ash concrete at present, the concrete provided by the invention has the advantages that the compressive strength, the compactness and the freezing resistance of the concrete are obviously improved by modifying the natural volcanic ash and adding the modified ultrafine fly ash and the freezing-resistant functional material.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (8)
1. The natural volcanic ash green high-performance concrete is characterized in that: the composition comprises the following components in parts by weight: 350 parts of Portland cement, 80-120 parts of modified natural volcanic ash, 20-40 parts of modified ultrafine fly ash, 15-25 parts of anti-freezing functional material, 500 parts of river sand, 400 parts of machine-made sand, 900 parts of crushed stone, 165 parts of water and 6-6.5 parts of water reducer;
the modified natural volcanic ash is subjected to modification treatment by the following method:
firstly, grinding dry natural volcanic ash with the mass fraction of 70 percent by adopting grinding equipment until the specific surface area is more than 300m2Per kg, then adding 19 percent of sun-dried natural volcanic ash,Mixing and grinding 10% of slag powder and 1% of glycol by mass until the specific surface area is more than 450m2/kg；
The modified ultrafine fly ash is modified by the following method:
putting 99 parts by weight of fly ash and 1 part by weight of alkaline activator into a ball mill, and mixing and milling until the specific surface area is more than 1200m2Per kg, obtaining modified ultrafine fly ash; the alkali activator consists of 25 weight parts of alunite, 45 weight parts of dihydrate gypsum and 30 weight parts of anhydrous sodium sulfate;
the anti-freezing functional material is prepared from anti-freezing alloy powder and a water repellent agent according to the mass ratio of (60-80): (20-40) by mixing;
the anti-freezing alloy powder is formed by spraying, rolling and grinding silicon dioxide, magnesium oxide, aluminum oxide and silicon aluminum magnesium compound at the high temperature of 900-1000 ℃;
the hydrophobic agent is a silane-based hydrophobic agent;
the water reducing agent is a polycarboxylate water reducing agent, the solid content of the water reducing agent is more than 25%, and the water reducing rate is more than 30%.
2. The natural pozzolan green high performance concrete of claim 1, wherein: the natural volcanic ash is volcanic cinders, pumice or tuff.
3. The natural pozzolan green high performance concrete of claim 1 or 2, wherein: the slag powder is S95 slag powder, the 28d activity index is more than 100 percent, and the specific surface area is more than 350m2/kg。
4. The natural pozzolan green high performance concrete of claim 1, wherein: the anti-freezing functional material is prepared from anti-freezing alloy powder and a water repellent agent according to the mass ratio of (65-75): (25-35) in proportion.
5. The natural pozzolan green high performance concrete of claim 1, wherein: the fly ash is I-grade fly ash, the water requirement ratio is less than 95%, and the fineness is less than 12%.
6. The natural pozzolan green high performance concrete of claim 1, wherein: the fineness modulus of the river sand is 2.6-3.0, and the addition amount is 440-460 parts by weight.
7. The natural pozzolan green high performance concrete of claim 1, wherein: the fineness modulus of the machine-made sand is 2.5-2.8, the mass content of limestone powder in the machine-made sand is 5-10%, and the crushing value of the machine-made sand is less than 10%.
8. The natural pozzolan green high performance concrete of claim 1, wherein: the crushed stone is 5-26.5mm continuous graded crushed stone with density grade of more than 2600kg/m3The porosity is less than 42%, and the crushed value of the macadam is less than 6%.
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| CN110950584B (en) * | 2019-12-23 | 2021-12-07 | 中建西部建设新疆有限公司 | Silica fume/volcanic ash based geopolymer concrete and preparation method thereof |
| CN113998954B (en) * | 2021-11-26 | 2023-04-14 | 中建八局第二建设有限公司 | Modified composite superfine powder pavement concrete, preparation method and application |
| CN115259730B (en) * | 2022-05-23 | 2023-07-14 | 长江水利委员会长江科学院 | Concrete composite admixture containing tuff powder and preparation method thereof |
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| WO2004087600A2 (en) * | 2003-03-27 | 2004-10-14 | Research Incubator, Ltd. | Cementitious composition |
| CN102503525A (en) * | 2011-10-15 | 2012-06-20 | 潍坊亚欣工贸有限公司 | Preparation method for inorganic foaming fireproof insulation plate |
| CN102765897A (en) * | 2012-07-20 | 2012-11-07 | 泰州振昌工业废渣综合利用有限责任公司 | Composite micro-powder made of mineral slag and steel slag |
| CN108249849A (en) * | 2018-01-16 | 2018-07-06 | 云南交投集团公路建设有限公司 | A kind of high agstone volume green concrete |
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2018
- 2018-11-16 CN CN201811369550.5A patent/CN109400062B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004087600A2 (en) * | 2003-03-27 | 2004-10-14 | Research Incubator, Ltd. | Cementitious composition |
| CN102503525A (en) * | 2011-10-15 | 2012-06-20 | 潍坊亚欣工贸有限公司 | Preparation method for inorganic foaming fireproof insulation plate |
| CN102765897A (en) * | 2012-07-20 | 2012-11-07 | 泰州振昌工业废渣综合利用有限责任公司 | Composite micro-powder made of mineral slag and steel slag |
| CN108249849A (en) * | 2018-01-16 | 2018-07-06 | 云南交投集团公路建设有限公司 | A kind of high agstone volume green concrete |
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