CN114751670A - High-performance concrete admixture and preparation method thereof - Google Patents
High-performance concrete admixture and preparation method thereof Download PDFInfo
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- 239000004574 high-performance concrete Substances 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title abstract description 16
- 239000004567 concrete Substances 0.000 claims abstract description 102
- 239000000843 powder Substances 0.000 claims abstract description 97
- 239000010881 fly ash Substances 0.000 claims abstract description 70
- 239000002893 slag Substances 0.000 claims abstract description 60
- 150000004683 dihydrates Chemical class 0.000 claims abstract description 58
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 58
- 239000010440 gypsum Substances 0.000 claims abstract description 58
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000011521 glass Substances 0.000 claims abstract description 42
- 239000000176 sodium gluconate Substances 0.000 claims abstract description 42
- 229940005574 sodium gluconate Drugs 0.000 claims abstract description 42
- 235000012207 sodium gluconate Nutrition 0.000 claims abstract description 42
- 239000011324 bead Substances 0.000 claims abstract description 40
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000002253 acid Substances 0.000 claims abstract description 39
- 239000011863 silicon-based powder Substances 0.000 claims abstract description 38
- 239000002994 raw material Substances 0.000 claims abstract description 26
- 229910021487 silica fume Inorganic materials 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000011325 microbead Substances 0.000 claims 2
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 239000004568 cement Substances 0.000 abstract description 21
- 238000006703 hydration reaction Methods 0.000 abstract description 16
- 230000036571 hydration Effects 0.000 abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 238000007711 solidification Methods 0.000 abstract description 8
- 230000008023 solidification Effects 0.000 abstract description 8
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000000047 product Substances 0.000 description 17
- 238000010276 construction Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 235000010755 mineral Nutrition 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- -1 pebble Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 239000002969 artificial stone Substances 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000011882 ultra-fine particle Substances 0.000 description 1
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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
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/22—Glass ; Devitrified glass
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/146—Silica fume
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/04—Carboxylic acids; Salts, anhydrides or esters thereof
- C04B24/06—Carboxylic acids; Salts, anhydrides or esters thereof containing hydroxy groups
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Combustion & Propulsion (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application provides a high-performance concrete admixture and a preparation method thereof, relating to the technical field of concrete. The high-performance concrete admixture comprises the following raw materials in parts by weight: 20-60 parts of slag powder, 15-35 parts of fly ash, 20-60 parts of micro silicon powder, 1-8 parts of dihydrate gypsum, 3-12 parts of glass beads, 0.2-1.5 parts of polycarboxylic acid powder and 0.01-0.08 part of sodium gluconate. The high-performance concrete admixture prepared by the application can be added into concrete according to the proportion of 10-15%, the later strength of the concrete can be greatly improved, the cement hydration heat during concrete solidification can be reduced, and the release speed and the peak value of the hydration heat are reduced, so that the generation of cracks and fissures of the concrete is reduced, the mixing water consumption of the concrete can be reduced, the concrete solidification time is prolonged, and the slump loss of the concrete is reduced.
Description
Technical Field
The application relates to the technical field of concrete, in particular to a high-performance concrete admixture and a preparation method thereof.
Background
The concrete is generally obtained by mixing a cementing material, aggregate, water and an additive or admixture, and the concrete is hardened to form the artificial stone by fully and uniformly stirring, has rich raw materials, low cost and simple production process, and is widely applied to the building industry. With the rapid development of scientific technology in the concrete field, the performance requirements of the concrete are developed from single high strength to high performance (strength and durability), and the mix proportion of the concrete is developed from four components of original cement, sand, pebble, water and the like to six components of the existing cement, admixture, sand, pebble, water reducer and the like.
In order to improve the strength of concrete, there are two common methods of increasing the amount of cement and adding admixtures. However, the increase of the cement dosage has the disadvantages of violent hydration reaction, high speed and quick hydration heat release, thereby causing the problem of concrete cracking. In order to improve various performances of concrete, save cement consumption and adjust the strength grade of the concrete, natural or artificially processed powdery mineral substances capable of improving the performances of the concrete are mixed when the high-performance concrete is mixed, and the powdery mineral substances are collectively called as concrete admixture. At present, the most commonly used power plant slag or fly ash with the loss on ignition not more than 4 percent is used as a concrete admixture, and substances such as granulated blast furnace slag or volcanic ash are also used as admixtures, but the activity of the used concrete admixtures is lower than 95 percent.
With the development of concrete technology, people have recognized that the mineral admixture is combined with the water reducing agent, namely, the application of the 'double-doping' technology is the main technology adopted by modern high-performance concrete. At present, people know about the admixture, no longer regard some industrial waste residues as the admixture of concrete, but regard the industrial waste residues as the essential modification material in the concrete, the quality of the admixture is greatly improved, and the mixing amount of the admixture is also greatly improved.
In concrete construction, the gel material, the aggregate and the admixture are generally required to be uniformly mixed and then conveyed to a construction site, a certain amount of water is added to the mixture to form concrete after the mixture is delivered to the construction site, the concrete can be conveniently constructed by using the concrete, and the constructed concrete is coagulated and formed. The quality of the admixture cannot be guaranteed to be stable and effective due to the uneven technology and equipment of the admixture processing plant; the mixing station generally has a limited number of charging tanks for storing admixtures, and if a plurality of admixtures are mixed and mixed, the storage tanks are not enough; in addition, the technical level of the mixing stations is different, the proportion of admixture used in the self-prepared high-performance concrete is not accurate enough, so that the quality of the concrete is uneven, the problem of cracking still exists after the existing concrete is solidified, and the durability of the concrete is reduced.
Disclosure of Invention
The application aims to provide a high-performance concrete admixture which has the advantage of improving the quality of concrete.
Another object of the present application is to provide a method for preparing a high-performance concrete admixture, so as to obtain the high-performance concrete admixture.
The technical problem to be solved by the application is solved by adopting the following technical scheme.
On one hand, the embodiment of the application provides a high-performance concrete admixture which comprises the following raw materials in parts by weight: 20-60 parts of slag powder, 15-35 parts of fly ash, 20-60 parts of micro silicon powder, 1-8 parts of dihydrate gypsum, 3-12 parts of glass beads, 0.2-1.5 parts of polycarboxylic acid powder and 0.01-0.08 part of sodium gluconate.
On the other hand, the embodiment of the application provides a preparation method of a high-performance concrete admixture, which comprises the following steps:
crushing the slag powder, the dihydrate gypsum and the fly ash;
uniformly mixing the micro silicon powder, the glass beads, the polycarboxylic acid powder, the sodium gluconate, the crushed slag powder, the crushed dihydrate gypsum and the crushed fly ash to obtain a finished product of the performance concrete admixture.
Compared with the prior art, the embodiment of the application has at least the following advantages or beneficial effects:
the high-performance concrete admixture prepared by the method can be added into concrete according to the proportion of 10-15%, can greatly improve the later strength of the concrete (can enhance the activity index of the concrete and further improve the later strength, the strength can still be increased in the later stage of the concrete, such as 90 days), can reduce the hydration heat of the cement when the concrete is solidified, and reduce the release speed and the peak value of the hydration heat (the addition of the admixture can replace a part of the cement, reduce the using amount of the cement, and further reduce the hydration heat, and the sodium gluconate added in the method can prolong the solidification time of the concrete and further slowly reduce the release speed and the peak value of the hydration heat of the concrete), thereby reducing the generation of cracks and cracks of the concrete, reducing the mixing water consumption of the concrete, prolonging the solidification time of the concrete, and reducing the slump loss of the concrete, higher engineering quality can be ensured; the admixture has ultrafine particles (silica fume), the fly ash reaches the level of several micrometers, the silica fume reaches the level of nanometers, and fine gaps among cement particles in concrete can be filled, so that the concrete is more compact, and the requirements on higher strength and durability are met; the glass beads added in the application can enhance the fluidity of concrete, reduce the viscosity of the concrete, reduce the labor intensity of construction workers and facilitate construction.
The preparation method is simple and convenient, the admixture can be quickly prepared in a large scale, and the production cost is reduced.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
FIG. 1 is a diagram of a high performance concrete admixture prepared in example 1 of the present application;
FIG. 2 is a product diagram of a high performance concrete admixture prepared in example 3 of the present application;
FIG. 3 is a product diagram of a high performance concrete admixture prepared in example 5 of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below. The examples, in which specific conditions are not specified, were carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to specific examples.
The application provides a high-performance concrete admixture which comprises the following raw materials in parts by weight: 20-60 parts of slag powder, 15-35 parts of fly ash, 20-60 parts of micro silicon powder, 1-8 parts of dihydrate gypsum, 3-12 parts of glass beads, 0.2-1.5 parts of polycarboxylic acid powder and 0.01-0.08 part of sodium gluconate. The high-performance concrete admixture prepared by the method can be added into concrete according to the proportion of 10-15%, can greatly improve the later strength of the concrete (can enhance the activity index of the concrete and further improve the later strength, the strength can still be increased in the later stage of the concrete, such as 90 days), can reduce the hydration heat of the cement when the concrete is solidified, and reduce the release speed and the peak value of the hydration heat (the addition of the admixture can replace a part of the cement, reduce the using amount of the cement, and further reduce the hydration heat, and the sodium gluconate added in the method can prolong the solidification time of the concrete and further slowly reduce the release speed and the peak value of the hydration heat of the concrete), thereby reducing the generation of cracks and cracks of the concrete, reducing the mixing water consumption of the concrete, prolonging the solidification time of the concrete, and reducing the slump loss of the concrete, higher engineering quality can be ensured; the admixture has extremely fine particles (silica fume), the fly ash reaches the level of several microns, the silica fume reaches the level of nanometers, and fine gaps among cement particles in concrete can be filled, so that the concrete is more compact, and the requirements on higher strength and durability are met; the glass beads added in the application can enhance the flowability of concrete, reduce the viscosity of the concrete, reduce the labor intensity of construction workers and facilitate construction.
In some embodiments of the present application, the fly ash is a primary fly ash. The selected first-grade fly ash can enable the fineness to be higher, and the fly ash can have more surface area, so that the fly ash has better activity.
In some embodiments of the present application, the loss on ignition of the above-described slag powder, dihydrate gypsum, fly ash, and silica fume is less than 4%. When the ignition loss is less than 4%, the purity is high, the raw material composition is stable, and the admixture has higher stability when prepared into an admixture subsequently, so that the quality of a final product is good.
In some embodiments of the present application, the silicon content of the micro silicon powder is 80-92%.
In some embodiments of the present application, the high performance concrete admixture comprises the following raw materials in parts by weight: 30-50 parts of slag powder, 20-30 parts of fly ash, 30-50 parts of micro silicon powder, 1-5 parts of dihydrate gypsum, 5-10 parts of glass beads, 0.5-1.2 parts of polycarboxylic acid powder and 0.01-0.05 part of sodium gluconate.
In some embodiments of the present application, the high performance concrete admixture comprises the following raw materials in parts by weight: 45 parts of slag powder, 20 parts of fly ash, 32 parts of micro silicon powder, 2 parts of dihydrate gypsum, 6 parts of glass beads, 0.5 part of polycarboxylic acid powder and 0.02 part of sodium gluconate.
In some embodiments of the present application, the high performance concrete admixture comprises the following raw materials in parts by weight: 40 parts of slag powder, 25 parts of fly ash, 40 parts of micro silicon powder, 3 parts of dihydrate gypsum, 8 parts of glass beads, 0.9 part of polycarboxylic acid powder and 0.03 part of sodium gluconate.
In some embodiments of the present application, the high performance concrete admixture comprises the following raw materials in parts by weight: 35 parts of slag powder, 25 parts of fly ash, 45 parts of micro silicon powder, 4 parts of dihydrate gypsum, 6 parts of glass beads, 0.8 part of polycarboxylic acid powder and 0.04 part of sodium gluconate.
The application also provides a preparation method of the high-performance concrete admixture, which comprises the following steps:
crushing the slag powder, the dihydrate gypsum and the fly ash;
uniformly mixing the micro silicon powder, the glass beads, the polycarboxylic acid powder, the sodium gluconate, the crushed slag powder, the crushed dihydrate gypsum and the crushed fly ash to obtain a finished product of the performance concrete admixture. The preparation method is simple and convenient, the admixture can be quickly prepared in a large scale, and the production cost is reduced.
In some embodiments of the present application, the size of the disruption is 600-700 mesh. In the size range, the admixture can be made to be fine enough, so that gaps among cement particles in concrete can be filled, the concrete is more compact, and the requirements on higher strength and durability are met.
The features and properties of the present application are described in further detail below with reference to examples.
Example 1
A preparation method of a high-performance concrete admixture comprises the following steps:
raw materials: 20kg of slag powder, 15kg of fly ash, 20kg of micro silicon powder, 1kg of dihydrate gypsum, 3kg of glass beads, 0.2kg of polycarboxylic acid powder and 0.01kg of sodium gluconate.
Crushing the slag powder, the dihydrate gypsum and the fly ash to 600 meshes;
uniformly mixing the micro silicon powder, the glass beads, the polycarboxylic acid powder, the sodium gluconate, the crushed slag powder, the crushed dihydrate gypsum and the crushed fly ash to obtain a finished product of the performance concrete admixture.
Example 2
A preparation method of a high-performance concrete admixture comprises the following steps:
raw materials: 30kg of slag powder, 20kg of fly ash, 30kg of micro silicon powder, 1kg of dihydrate gypsum, 5kg of glass beads, 0.5kg of polycarboxylic acid powder and 0.01kg of sodium gluconate.
Crushing the slag powder, the dihydrate gypsum and the fly ash to 600 meshes;
uniformly mixing the micro silicon powder, the glass beads, the polycarboxylic acid powder, the sodium gluconate, the crushed slag powder, the crushed dihydrate gypsum and the crushed fly ash to obtain a finished product of the performance concrete admixture.
Example 3
A preparation method of a high-performance concrete admixture comprises the following steps:
raw materials: 45kg of slag powder, 20kg of fly ash, 32kg of micro silicon powder, 2kg of dihydrate gypsum, 6kg of glass beads, 0.5kg of polycarboxylic acid powder and 0.02kg of sodium gluconate.
Crushing the slag powder, the dihydrate gypsum and the fly ash to 600 meshes;
uniformly mixing the micro silicon powder, the glass beads, the polycarboxylic acid powder, the sodium gluconate, the crushed slag powder, the crushed dihydrate gypsum and the crushed fly ash to obtain a finished product of the performance concrete admixture.
Example 4
A preparation method of a high-performance concrete admixture comprises the following steps:
raw materials: 40kg of slag powder, 25kg of fly ash, 40kg of micro silicon powder, 3kg of dihydrate gypsum, 8kg of glass beads, 0.9kg of polycarboxylic acid powder and 0.03kg of sodium gluconate.
Crushing the slag powder, the dihydrate gypsum and the fly ash to 600 meshes;
uniformly mixing the micro silicon powder, the glass beads, the polycarboxylic acid powder, the sodium gluconate, the crushed slag powder, the crushed dihydrate gypsum and the crushed fly ash to obtain a finished product of the performance concrete admixture.
Example 5
A preparation method of a high-performance concrete admixture comprises the following steps:
raw materials: 35kg of slag powder, 25kg of fly ash, 45kg of micro silicon powder, 4kg of dihydrate gypsum, 6kg of glass beads, 0.8kg of polycarboxylic acid powder and 0.04kg of sodium gluconate.
Crushing the slag powder, the dihydrate gypsum and the fly ash to 600 meshes;
uniformly mixing the micro silicon powder, the glass beads, the polycarboxylic acid powder, the sodium gluconate, the crushed slag powder, the crushed dihydrate gypsum and the crushed fly ash to obtain a finished product of the performance concrete admixture.
Example 6
A preparation method of a high-performance concrete admixture comprises the following steps:
raw materials: 50kg of slag powder, 30kg of fly ash, 50kg of micro silicon powder, 5kg of dihydrate gypsum, 10kg of glass beads, 1.2kg of polycarboxylic acid powder and 0.05kg of sodium gluconate.
Crushing the slag powder, the dihydrate gypsum and the fly ash to 600 meshes;
uniformly mixing the micro silicon powder, the glass beads, the polycarboxylic acid powder, the sodium gluconate, the crushed slag powder, the crushed dihydrate gypsum and the crushed fly ash to obtain a finished product of the performance concrete admixture.
Example 7
A preparation method of a high-performance concrete admixture comprises the following steps:
raw materials: 60kg of slag powder, 35kg of fly ash, 60kg of micro silicon powder, 8kg of dihydrate gypsum, 12kg of glass beads, 1.5kg of polycarboxylic acid powder and 0.08kg of sodium gluconate.
Crushing the slag powder, the dihydrate gypsum and the fly ash to 600 meshes;
uniformly mixing the micro silicon powder, the glass beads, the polycarboxylic acid powder, the sodium gluconate, the crushed slag powder, the crushed dihydrate gypsum and the crushed fly ash to obtain a finished product of the performance concrete admixture.
Example 8
This example is substantially the same as example 3, except that: the slag powder, the dihydrate gypsum and the fly ash are crushed to 650 meshes.
Raw materials: 45kg of slag powder, 20kg of fly ash, 32kg of micro silicon powder, 2kg of dihydrate gypsum, 6kg of glass beads, 0.5kg of polycarboxylic acid powder and 0.02kg of sodium gluconate.
Crushing the slag powder, the dihydrate gypsum and the fly ash to 650 meshes;
uniformly mixing the micro silicon powder, the glass beads, the polycarboxylic acid powder, the sodium gluconate, the crushed slag powder, the crushed dihydrate gypsum and the crushed fly ash to obtain a finished product of the performance concrete admixture.
Example 9
This example is substantially the same as example 3, except that: the slag powder, the dihydrate gypsum and the fly ash are crushed to 700 meshes.
Raw materials: 45kg of slag powder, 20kg of fly ash, 32kg of micro silicon powder, 2kg of dihydrate gypsum, 6kg of glass beads, 0.5kg of polycarboxylic acid powder and 0.02kg of sodium gluconate.
Crushing the slag powder, the dihydrate gypsum and the fly ash to 700 meshes;
uniformly mixing the micro silicon powder, the glass beads, the polycarboxylic acid powder, the sodium gluconate, the crushed slag powder, the crushed dihydrate gypsum and the crushed fly ash to obtain a finished product of the performance concrete admixture.
Comparative example 1
This example is substantially the same as example 3, except that: the fly ash is second-grade fly ash.
Raw materials: 45kg of slag powder, 20kg of secondary fly ash, 32kg of micro silicon powder, 2kg of dihydrate gypsum, 6kg of glass beads, 0.5kg of polycarboxylic acid powder and 0.02kg of sodium gluconate.
Crushing the slag powder, the dihydrate gypsum and the secondary fly ash to 600 meshes;
uniformly mixing the micro silicon powder, the glass beads, the polycarboxylic acid powder, the sodium gluconate, the crushed slag powder, the crushed dihydrate gypsum and the crushed fly ash to obtain a finished product of the performance concrete admixture.
Comparative example 2
This example is substantially the same as example 3, except that: sodium gluconate was not added.
Raw materials: 45kg of slag powder, 20kg of fly ash, 32kg of micro silicon powder, 2kg of dihydrate gypsum, 6kg of glass beads and 0.5kg of polycarboxylic acid powder.
Crushing the slag powder, the dihydrate gypsum and the fly ash to 600 meshes;
uniformly mixing the micro silicon powder, the glass beads, the polycarboxylic acid powder, the sodium gluconate, the crushed slag powder, the crushed dihydrate gypsum and the crushed fly ash to obtain a finished product of the performance concrete admixture.
Comparative example 3
This example is substantially the same as example 3, except that: silica fume and fly ash are not added.
Raw materials: 45kg of slag powder, 2kg of dihydrate gypsum, 6kg of glass beads, 0.5kg of polycarboxylic acid powder and 0.02kg of sodium gluconate.
Crushing the slag powder and the dihydrate gypsum to 600 meshes;
and uniformly mixing the glass beads, the polycarboxylic acid powder, the sodium gluconate, the crushed slag powder, the crushed dihydrate gypsum and the crushed fly ash to obtain a finished product of the performance concrete admixture.
Experimental example 1
The admixtures prepared in example 1, example 3, example 5, example 7, example 8 and comparative example 3 were subjected to an experiment, added to cement at an addition of 10%, and tested, and the results are shown in Table 1.
TABLE 1
With reference to table 1, it can be seen that the inspection data of the high performance concrete admixture prepared in the embodiment of the present application on the measured density, the measured slump expansion, the expansion time T500, the air content and the 28-day compressive strength are superior to those of comparative example 3, which indicates that the high performance concrete admixture prepared in the present application can fill fine gaps among cement particles in concrete, has high strength and durability, can reduce the generation of cracks and fissures in concrete, can reduce the mixing water consumption of concrete, prolong the concrete setting time, reduce the slump loss of concrete, and can ensure high engineering quality.
Experimental example 2
The admixtures prepared in examples 1 to 8 were examined according to JC/T486-2015 Admixture for concrete, and the results are shown in Table 2.
TABLE 2
In combination with table 2, it can be seen that the high performance concrete admixtures prepared by the present application all meet the standard requirements.
In conclusion, the high-performance concrete admixture prepared by the method can be added into concrete according to the proportion of 10-15%, can greatly improve the later strength of the concrete (can enhance the activity index of the concrete and further improve the later strength, the strength can still be increased in the later period of the concrete, such as 90 days), can reduce the hydration heat of the cement when the concrete is solidified, and reduce the release speed and the peak value of the hydration heat (the addition of the admixture can replace a part of the cement, reduce the using amount of the cement, and further reduce the hydration heat, and the sodium gluconate added in the method can prolong the solidification time of the concrete and further slowly reduce the release speed and the peak value of the hydration heat of the concrete), thereby reducing the generation of cracks and fissures of the concrete, reducing the mixing water consumption of the concrete, prolonging the solidification time of the concrete, and reducing the slump loss of the concrete, higher engineering quality can be ensured; the admixture has extremely fine particles (silica fume), the fly ash reaches the level of several microns, the silica fume reaches the level of nanometers, and fine gaps among cement particles in concrete can be filled, so that the concrete is more compact, and the requirements on higher strength and durability are met; the glass beads added in the application can enhance the flowability of concrete, reduce the viscosity of the concrete, reduce the labor intensity of construction workers and facilitate construction. The preparation method is simple and convenient, the admixture can be quickly prepared in a large scale, and the production cost is reduced.
The embodiments described above are some, but not all embodiments of the present application. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Claims (10)
1. The high-performance concrete admixture is characterized by comprising the following raw materials in parts by weight: 20-60 parts of slag powder, 15-35 parts of fly ash, 20-60 parts of micro silicon powder, 1-8 parts of dihydrate gypsum, 3-12 parts of glass beads, 0.2-1.5 parts of polycarboxylic acid powder and 0.01-0.08 part of sodium gluconate.
2. The admixture for high performance concrete of claim 1, wherein said fly ash is a first grade fly ash.
3. The admixture for high performance concrete according to claim 1, wherein the loss on ignition of said slag powder, dihydrate gypsum, fly ash and silica fume is less than 4%.
4. The admixture for high performance concrete as claimed in claim 1, wherein said silica content of said silica fume is 80-92%.
5. The high-performance concrete admixture according to claim 1, wherein the high-performance concrete admixture comprises the following raw materials in parts by weight: 30-50 parts of slag powder, 20-30 parts of fly ash, 30-50 parts of micro silicon powder, 1-5 parts of dihydrate gypsum, 5-10 parts of glass beads, 0.5-1.2 parts of polycarboxylic acid powder and 0.01-0.05 part of sodium gluconate.
6. The high-performance concrete admixture according to claim 1, wherein the high-performance concrete admixture comprises the following raw materials in parts by weight: 45 parts of slag powder, 20 parts of fly ash, 32 parts of micro silicon powder, 2 parts of dihydrate gypsum, 6 parts of glass micro beads, 0.5 part of polycarboxylic acid powder and 0.02 part of sodium gluconate.
7. The high-performance concrete admixture according to claim 1, wherein the high-performance concrete admixture comprises the following raw materials in parts by weight: 40 parts of slag powder, 25 parts of fly ash, 40 parts of micro silicon powder, 3 parts of dihydrate gypsum, 8 parts of glass beads, 0.9 part of polycarboxylic acid powder and 0.03 part of sodium gluconate.
8. The high-performance concrete admixture according to claim 1, wherein the high-performance concrete admixture comprises the following raw materials in parts by weight: 35 parts of slag powder, 25 parts of fly ash, 45 parts of micro silicon powder, 4 parts of dihydrate gypsum, 6 parts of glass micro beads, 0.8 part of polycarboxylic acid powder and 0.04 part of sodium gluconate.
9. The process for preparing a high performance concrete admixture according to any one of claims 1 to 8, comprising the steps of:
crushing the slag powder, the dihydrate gypsum and the fly ash;
uniformly mixing the micro silicon powder, the glass beads, the polycarboxylic acid powder, the sodium gluconate, the crushed slag powder, the crushed dihydrate gypsum and the crushed fly ash to obtain a finished product of the performance concrete admixture.
10. The method as claimed in claim 9, wherein the crushing size is 600-700 mesh.
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