CN116496040A - Self-compacting concrete and preparation method thereof - Google Patents
Self-compacting concrete and preparation method thereof Download PDFInfo
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- CN116496040A CN116496040A CN202310333757.1A CN202310333757A CN116496040A CN 116496040 A CN116496040 A CN 116496040A CN 202310333757 A CN202310333757 A CN 202310333757A CN 116496040 A CN116496040 A CN 116496040A
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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
-
- 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
- C04B18/141—Slags
- C04B18/144—Slags from the production of specific metals other than iron or of specific alloys, e.g. ferrochrome slags
-
- 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
- C04B24/24—Macromolecular compounds
- C04B24/38—Polysaccharides or derivatives thereof
- C04B24/383—Cellulose or derivatives thereof
-
- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses machine-made sand self-compacting concrete and a preparation method thereof, wherein the machine-made sand self-compacting concrete comprises the following components in parts by weight: 700-800 parts of broken stone, 700-800 parts of machine-made sand, 665-695 parts of cement, 165-185 parts of fly ash, 470-500 parts of water quenched copper slag, 400-420 parts of water, 9-10 parts of water reducer, 0-2 parts of tackifier, wherein the grain size of the water quenched copper slag is less than 5mm, the silicon dioxide content is 29-37%, the ferrous oxide content is 41-54%, and the apparent density is 3470kg/m 3 The apparent density of the self-compacting concrete is not less than 2200kg/m 3 The strength is not lower than 50MPa. The preparation method has simple procedures and few raw material types, and the prepared machine-made sand self-compacting concrete canThe hydraulic pump has good working performance and mechanical property, and is convenient for transportation and pumping construction.
Description
Technical Field
The invention belongs to the field of construction materials, and particularly relates to self-compacting concrete and a preparation method thereof.
Background
The self-compacting concrete is high-performance concrete which is high in fluidization state, does not separate, can achieve homogeneous and compact filling molding under the neutral action, brings great convenience to construction, and has the economic benefits of improving the quality of the concrete, improving the construction environment, accelerating the construction progress, reducing the engineering cost and the like.
The copper yield of China is in a state of rapid increase all the time, the copper yield of China reaches 132 ten thousand tons in 2000, the copper yield of China is increased to 479 ten thousand tons in 2010 beyond the first world of Chilean and spring, and the copper smelting slag yield reaches about 3000 more than ten thousand tons only in 2020. The water quenched copper slag is a black, compact, hard and wear-resistant glass phase, and has granular and strip appearance, small amount of needle-like particles are mixed, the surface has metallic luster, irregular particle shape and clear edges and corners. The density is far higher than that of natural sand, the material is hard, and the water permeability is extremely high.
Fly ash is spherical particle industrial waste produced by thermal power plants, has smooth surface and compact texture, can reduce the interaction of particles through ball effect, reduces water consumption and improves the fluidity of concrete.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide the machine-made sand self-compacting concrete which can ensure the strength and simultaneously has good working performance, and the effects of reducing engineering cost, saving energy and reducing emission are achieved by replacing fine aggregates by the fly ash with equal volume and replacing cement, water quenched copper slag and other masses. Meanwhile, the invention also provides a preparation method of the machine-made sand self-compacting concrete.
To achieve the above and other related objects, the present invention adopts the following technical solutions:
the invention provides machine-made sand self-compacting concrete, which comprises the following components in parts by weight: 700-800 parts of broken stone, 700-800 parts of machine-made sand, 665-695 parts of cement, 165-185 parts of fly ash, 470-500 parts of water quenched copper slag, 400-420 parts of water, 9-10 parts of water reducer and 0-2 parts of tackifier; the grain diameter of the machine-made sand is 0-5mm, the fineness modulus is 2.5, and the apparent density is 2640kg/m3; the grain diameter of the water quenched copper slag is less than 5mm, the silicon dioxide content is 29-37%, the ferric oxide content is 41-54%, and the apparent density is 3470kg/m 3 The apparent density of the machine-made sand self-compacting concrete is not less than 2200kg/m 3 The strength is not lower than 50MPa.
As a preferable technical scheme, the adhesive comprises the following components in parts by weight: 750 parts of broken stone, 750 parts of machine-made sand, 680 parts of cement, 170 parts of fly ash, 485 parts of water quenched copper slag, 410 parts of water, 9.5 parts of water reducer and 0.5 part of tackifier.
As a preferable technical scheme, the volume ratio of the machine-made sand to the water quenched copper slag is 4:1, the fineness modulus of the water quenched copper slag is 2.64, and the apparent density is 3470kg/m 3 。
As a preferable technical scheme, the crushed stone is crushed stone with the grain diameter of 5-20mm and the apparent density of 2670kg/m 3 。
As a preferred technical scheme, the cement is P.O 42.5.42.5 cement.
As a preferable technical scheme, the fly ash is class I fly ash, and the apparent density is 2220kg/m 3 。
As a preferable technical scheme, the water reducer is a high-efficiency polycarboxylate water reducer.
As a preferable technical scheme, the tackifier is carboxymethyl cellulose.
In a second aspect of the present invention, there is provided a method for preparing machine-made sand self-compacting concrete, for preparing the machine-made sand self-compacting concrete, comprising the steps of:
step one, adding machine-made sand, water quenched copper slag and half of water consumption into a stirrer to stir for 90s;
step two, adding cement and fly ash, and stirring for 90s;
diluting the water reducer with the other half of water to obtain a mixed solution, adding the mixed solution, and stirring for 90s;
and fourthly, adding the crushed stone into a stirrer to stir for 90 seconds, and then adding the tackifier and stirring until the mixture is uniform.
The water quenched copper slag is a black vitreous material formed by putting the copper slag into a water quenching tank behind a furnace for reprocessing in the copper smelting process, has high density and high hardness, and can obviously increase the apparent density of concrete. The particle fineness modulus of the water quenched copper slag after the re-crushing treatment is actually measured to be 2.64, and the accumulated screen residue is shown in table 2. On one hand, the higher specific heat capacity of the copper slag reduces the risk of cracking of the concrete in the curing process, and on the other hand, the water quenched copper slag improves the integral grading of the machine-made sand, and the higher density of the water quenched copper slag compared with the natural sand also improves the fluidity of the concrete from the physical property.
The fly ash can improve the working performance of the concrete through the ball effect, reduce the consumption of cement, reduce the hydration heat release of the cement and avoid cracking of the concrete in the curing process caused by too fast temperature rise. In addition, the fly ash has a certain pozzolanic effect, inhibits the generation of alkali aggregate reaction, and is more beneficial to the development of the long-term strength of concrete.
As described above, the machine-made sand self-compacting concrete has the following beneficial effects:
(1) The water quenched copper slag can improve the compressive strength of concrete, improve the fluidity of the concrete and reduce the risk of hydration cracking of the concrete after the concrete is formed.
(2) The fly ash provided by the invention can inhibit shrinkage cracking of concrete pouring to a certain extent, and is beneficial to stable development of long-term strength.
(3) The carboxymethyl cellulose disclosed by the invention can improve the wrapping property and cohesiveness of cement paste on aggregate, improve the viscosity of concrete, inhibit the sinking phenomenon of fine aggregate by a proper amount of tackifier, and improve the workability of concrete.
(4) The machine-made sand self-compacting concrete has good working performance and mechanical property, and is convenient for transportation and pumping construction.
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
The various raw material types, compositions, models, and basic performance indexes in this example are shown below.
Coarse aggregate: crushed stone with particle size of 5-20mm and apparent density of 2670kg/m 3 The water content is 1%, and the needle-like content is 5%. The cumulative screen residue of the coarse aggregate is shown in table 1.
TABLE 1
Fine aggregate: machine-made sand with particle size of 0-5mm, fineness modulus of 2.5, apparent density of 2640kg/m 3 . Water quenched copper slag with grain size of 0-5mm, fineness modulus of 2.64 and SiO 2 29-37% FeO, 41-54% apparent density 3470kg/m 3 . The cumulative screen residue of the water quenched copper slag is shown in table 2.
TABLE 2
And (3) cement: P.O 42.5 cement, apparent density 3340kg/m 3 。
Fly ash: class I fly ash, apparent density 3160kg/m 3 。
Water reducing agent: polycarboxylic acid type high-performance water reducer with density of 1030-1110kg/m 3 。
Tackifier: carboxymethyl cellulose
The preparation method of the self-compacting concrete of the embodiment is as follows:
adding water quenched copper slag, machine-made sand and half of water consumption into a stirrer to stir for 90s; adding cement and fly ash, and stirring for 90s; diluting the water reducer with the other half of water, adding and stirring for 90s; adding crushed stone and stirring for 90s; adding tackifier, and stirring to mix well.
In the following examples, the volume ratio of the machine-made sand to the water quenched copper slag is 4:1.
example 1
The embodiment provides machine-made sand self-compacting concrete which comprises the following components in parts by weight:
the properties of the self-compacting concrete prepared are shown in Table 3.
TABLE 3 Table 3
Example 2
The embodiment provides machine-made sand self-compacting concrete which comprises the following components in parts by weight:
the properties of the self-compacting concrete prepared are shown in Table 4.
TABLE 4 Table 4
Example 3
The embodiment provides machine-made sand self-compacting concrete which comprises the following components in parts by weight:
the properties of the self-compacting concrete prepared are shown in Table 5.
TABLE 5
According to the embodiments 1-3, in the mixing proportion of a higher water-cement ratio, the water quenched copper slag is used as aggregate to play a certain role in improving the mechanical property and durability of concrete, and the compressive strength similar to the low water-cement ratio mixing proportion can be obtained by adding the water quenched copper slag under a proper mixing amount. The water quenched copper slag can effectively improve the integral grain composition of aggregate, the ball effect is more obvious due to higher density, and the high fluidity and packing compactness are still obtained on the basis of reducing the use of natural sand and stone. Solves the problem of early cracking of the prior high-water-gel-ratio concrete, and has wider application prospect in the fields of mass concrete, stone throwing breakwater and the like. Meanwhile, the water quenched copper slag can promote the workability of machine-made sand concrete, improve pumping conditions and reduce construction cost.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (9)
1. The machine-made sand self-compacting concrete is characterized by comprising the following components in parts by weight: 700-800 parts of broken stone,700-800 parts of machine-made sand, 665-695 parts of cement, 165-185 parts of fly ash, 470-500 parts of water quenched copper slag, 400-420 parts of water, 9-10 parts of water reducer and 0-2 parts of tackifier; the grain diameter of the machine-made sand is 0-5mm, the fineness modulus is 2.5, and the apparent density is 2640kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The grain diameter of the water quenched copper slag is smaller than 5mm, the silicon dioxide content is 29-37%, the ferric oxide content is 41-54%, the fineness modulus is 2.64, and the apparent density is 3470kg/m < 3 >; the apparent density of the machine-made sand self-compacting concrete is not lower than 2200kg/m 3 The strength is not lower than 50MPa.
2. The machine-made sand self-compacting concrete according to claim 1, which comprises the following components in parts by weight: 750 parts of broken stone, 750 parts of machine-made sand, 680 parts of cement, 170 parts of fly ash, 485 parts of water quenched copper slag, 410 parts of water, 9.5 parts of water reducer and 0.5 part of tackifier.
3. The machine-made sand self-compacting concrete according to claim 1, wherein the fine aggregate is a mixture of machine-made sand and water quenched copper slag, the volume ratio of the machine-made sand to the water quenched copper slag is 4:1, the fineness modulus of the water quenched copper slag is 2.64, and the apparent density is 3470kg/m 3 。
4. The machine-made sand self-compacting concrete according to claim 1 or 2, wherein the crushed stone is crushed stone with a particle size of 5-20mm, and an apparent density of 2670kg/m 3 。
5. The machine-made sand self-compacting concrete of claim 1 or 2, wherein the cement is P.O 42.5.5 cement.
6. The machine-made sand self-compacting concrete of claim 1 or 2, wherein the fly ash is class I fly ash having an apparent density of 2220kg/m 3 。
7. The machine-made sand self-compacting concrete of claim 1 or 2, wherein the water reducer is a high efficiency polycarboxylate water reducer.
8. The machine-made sand self-compacting concrete of claim 1 or 2, wherein the tackifier is carboxymethyl cellulose.
9. A method for preparing the machine-made sand self-compacting concrete, which is used for preparing the machine-made sand self-compacting concrete according to any one of claims 1 to 9, and is characterized by comprising the following steps:
step one, adding machine-made sand, water quenched copper slag and half of water consumption into a stirrer to stir for 90s;
step two, adding cement and fly ash, and stirring for 90s;
diluting the water reducer with the other half of water to obtain a mixed solution, adding the mixed solution, and stirring for 90s;
and fourthly, adding the crushed stone into a stirrer to stir for 90 seconds, and then adding the tackifier and stirring until the mixture is uniform.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117776633A (en) * | 2024-02-27 | 2024-03-29 | 中铁二十二局集团轨道工程有限公司 | Preparation method of shield segment concrete |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117776633A (en) * | 2024-02-27 | 2024-03-29 | 中铁二十二局集团轨道工程有限公司 | Preparation method of shield segment concrete |
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