CN112759304B - High-strength steel slag concrete and preparation method thereof - Google Patents
High-strength steel slag concrete and preparation method thereof Download PDFInfo
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- CN112759304B CN112759304B CN202011623579.9A CN202011623579A CN112759304B CN 112759304 B CN112759304 B CN 112759304B CN 202011623579 A CN202011623579 A CN 202011623579A CN 112759304 B CN112759304 B CN 112759304B
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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
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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
- 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
- C04B18/142—Steelmaking slags, converter slags
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/12—Nitrogen containing compounds organic derivatives of hydrazine
- C04B24/123—Amino-carboxylic acids
-
- 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
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2652—Nitrogen containing polymers, e.g. polyacrylamides, polyacrylonitriles
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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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- 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)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the field of concrete pavement construction, and particularly discloses high-strength steel slag concrete and a preparation method thereof, wherein the steel slag concrete is prepared by stirring and mixing the following raw materials in parts by mass: 100-150 parts of cement, 120-150 parts of steel slag, 70-120 parts of water, 70-80 parts of fly ash and a strength reinforcing agent, wherein the strength reinforcing agent comprises 90-110 parts of sodium ethylene diamine tetracetate, and the preparation method comprises the following steps: the steel slag concrete composition can be used for paving road surfaces, and has the advantage of improving the strength of the steel slag concrete.
Description
Technical Field
The application relates to the field of concrete pavement construction, in particular to high-strength steel slag concrete and a preparation method thereof.
Background
With the vigorous development of the steel industry, the discharge amount of steel slag is increasing day by day, the newly-built and expanded steel slag field causes serious damage to the air water quality, and how to better utilize the residual steel slag is a difficult problem to be solved urgently.
In the prior art, the steel slag is used for replacing aggregate to prepare concrete, which is an effective way for improving the utilization rate of the steel slag. The steel slag has low price and great market advantage, and simultaneously, a great amount of steel slag can play a role in protecting the environment and avoiding the phenomenon of environmental pollution.
Disclosure of Invention
In order to improve the intensity of slag concrete, this application provides the slag concrete of a high strength.
In order to obtain high-strength steel slag concrete, the application provides a preparation method of the high-strength steel slag concrete.
In a first aspect, the application provides a high-strength steel slag concrete, which adopts the following technical scheme:
the high-strength steel slag concrete is prepared by stirring and mixing the following raw materials in parts by weight:
100 portions of cement and 150 portions of cement,
120 portions of steel slag and 150 portions of,
70-120 parts of water, namely,
70-80 parts of fly ash,
the strength reinforcing agent comprises 90-110 parts of sodium ethylene diamine tetracetate.
By adopting the technical scheme, as the steel slag is adopted to replace the aggregate, the separation of iron ions, calcium ions or manganese ions can exist in the steel slag in the mixing process and after the steel slag is produced, the separated iron ions, calcium ions or manganese ions can form flocculent precipitates on the surface of the steel slag in an alkaline environment, the flocculent precipitates are oxidized with the loss of water to form a hydroxide mixing layer with a loose layer, the subsequent water permeation is easy to permeate the mixing layer, the hydroxide mixing layer is gradually thickened, the strength of the steel slag concrete is reduced, after sodium ethylene diamine tetracetate is added, the sodium ethylene diamine tetracetate can directly carry out a complex reaction with metal ions separated from the steel slag, so that the speed of the separated iron ions, calcium ions or manganese ions which seeps out is slowed down, a space for forming the hydroxide loose layer is formed on the surface of the steel slag, and the bonding degree of the steel slag, the cement and the fly ash is improved by adding the sodium ethylene diamine tetracetate, the strength of the steel slag concrete is improved.
Preferably, the strength enhancer comprises 7-10 parts of a reducing agent.
By adopting the scheme, the reducing agent is added into the steel slag concrete, so that the seepage of metal ions (iron ions or manganese ions) in the steel slag can be inhibited, and the oxidation reaction can be generated after the seepage, and the reducing agent can reduce the oxidation reaction of the metal ions, so that the metal ions are prevented from forming a loose layer on the surface of the steel slag, and the strength of the steel slag concrete is improved.
Preferably, the reducing agent is stannous chloride.
Through adopting above-mentioned technical scheme, because in the later stage probably can have a small amount of water infiltration concrete for the slag content easily produces the hydroxide, the hydroxide makes the alkali content increase in the concrete, takes place the alkali aggregate reaction easily, adds stannous chloride, and stannous chloride just can form the rare earth salt at the concrete later stage reaction that solidifies, and the dilute acid salt is the acidity, can reduce the alkali content in the concrete, thereby can restrain the emergence of alkali aggregate reaction, improves the intensity of slag concrete.
Preferably, the strength enhancer comprises 20-30 parts of flocculant.
Through adopting above-mentioned technical scheme, because contain iron ion, magnesium ion and calcium ion in the slag and ooze easily and form the flocculent loose layer at the slag outer wall under alkaline environment, add the flocculating agent and can make the oxide that oozes to the slag outer wall gather by oneself, finally form closely knit oxide layer to can effectually restrain the concrete shaping later stage and ooze, form loose layer, thereby improve the intensity of slag concrete.
Preferably, the flocculant is polyacrylamide.
By adopting the technical scheme, the polyacrylamide is used as a flocculating agent and has better compatibility with the steel slag, and an oxide protective layer formed after reaction can better avoid the seepage of iron ions, magnesium ions and calcium ions, thereby improving the strength of the steel slag concrete.
Preferably, the strength enhancer comprises 5-7 parts of the early strength agent.
By adopting the technical scheme, the addition of the early strength agent increases the compatibility of the steel slag and the cement concrete, improves the early strength of the steel slag concrete, and improves the strength of the steel slag concrete by using the additive which has no obvious influence on the later strength.
Preferably, the particle size of the steel slag is 5-8 mm.
By adopting the technical scheme, when the grain size of the steel slag is 5-8mm, the void ratio is smaller when the steel slag is mixed with the cement, the mixing effect of the steel slag and the cement is better, and the strength of the steel slag concrete material is improved.
In a second aspect, the present application provides a method for preparing high-strength steel slag concrete, which adopts the following technical scheme: a preparation method of high-strength steel slag concrete comprises the following steps,
s1: and mixing the strength enhancer, the steel slag, the cement, the water and the fly ash, and uniformly mixing to obtain the steel slag concrete.
By adopting the technical scheme, the steel slag is added into the strength reinforcing agent and mixed, so that a layer of protective film for preventing iron ions, magnesium ions and the like from seeping is formed on the surface of the steel slag, and meanwhile, the alkali complexing agent and the reducing agent can avoid the generation of hydroxide, so that the steel slag suitable for serving as aggregate is obtained, and finally, the high-strength steel slag concrete is obtained.
In summary, the present application has the following beneficial effects:
1. because sodium ethylene diamine tetracetate is adopted, the sodium ethylene diamine tetracetate can directly carry out complex reaction with metal ions precipitated in the steel slag, so that the exudation speed of the precipitated iron ions, calcium ions or manganese ions is slowed down, and a space formed by a hydroxide loose layer is formed on the surface of the steel slag, so that the addition of the sodium ethylene diamine tetracetate improves the bonding degree of the steel slag, cement and fly ash, and high-strength concrete is obtained;
2. the flocculant is preferably adopted in the application, and the flocculant is added to enable the oxide seeped out to the outer wall of the steel slag to automatically aggregate and finally form a compact oxide layer, so that the metal ions in the steel slag can be effectively inhibited from being oxidized to form a loose layer after seeping out, and the strength of the steel slag concrete is greatly improved;
3. according to the method, the strength enhancer, the steel slag, the cement, the water and the fly ash are mixed, and the steel slag concrete is obtained after uniform mixing, so that the effect of high-strength concrete is obtained.
Detailed Description
The raw material sources are as follows:
the cement is a commercial product of the high and new material company Limited in Pingxiang province;
the steel slag is a commercial product of Hebei Jie precious mineral products GmbH;
the fly ash is a commercial product of a processing plant of a mineral product of the Lingshou county;
the stannous chloride is a commercial product of Jinan commercial and trade company Limited in Jinan, and the stannous chloride is powder;
polyacrylamide is a commercially available product of Jinan Ying commercial Co., Ltd;
calcium sulfate is a commercially available product of zhengzhou xinke chemical products limited.
Example 1
The high-strength steel slag concrete is prepared by stirring and mixing the following raw materials in parts by weight:
125 portions of cement
135 parts of steel slag, the grain diameter of the steel slag is 7mm,
90 parts of water, namely adding water into the mixture,
75 parts of fly ash,
the strength reinforcing agent comprises 100 parts of sodium ethylene diamine tetracetate, 9 parts of stannous chloride, 15 parts of polyacrylamide and 6 parts of calcium sulfate serving as an early strength agent.
A preparation method of high-strength steel slag concrete comprises the following steps:
s1: and (3) placing the strength reinforcing agent, the steel slag, the cement, the water and the fly ash in a small concrete mixer with the rated volume of 60L, stirring for 30 minutes, and uniformly mixing to obtain the steel slag concrete.
The production of high-strength steel slag concrete is carried out according to the preparation process, the consumption of raw materials is changed to be added into the steel slag concrete of examples 2 to 5, the other operation steps and parameters are the same as those of the steel slag concrete of example 1, and the concrete consumption conditions of the steel slag concrete of the examples 1 to 5 are shown in the following table 1.
Table 1, examples 1-5 specific raw material usage tables.
| Raw materials (kg) | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Cement | 125 | 100 | 115 | 141 | 150 |
| Steel slag | 135 | 120 | 131 | 139 | 150 |
| Water (W) | 95 | 70 | 77 | 111 | 120 |
| Fly ash | 75 | 70 | 74 | 78 | 80 |
| Ethylenediaminetetraacetic acid sodium salt | 100 | 90 | 95 | 106 | 110 |
| Stannous chloride | 9 | 7 | 8 | 10 | 11 |
| Polyacrylamide | 15 | 10 | 12 | 16 | 20 |
| Calcium formate | 6 | 5 | 7 | 5 | 7 |
The steel slag concretes obtained in examples 1 to 5 were tested.
1. The test method refers to the test of the compressive strength and the permeability resistance of the steel slag concrete 7d and 28d respectively recorded in the concrete physical mechanical property test method standard GB/T50081-2019.
The test results are shown in table 2 below, the test results of the compressive strength and permeability resistance tests of examples 1-5.
| Test items | Examples1 | Example 2 | Example 3 | Example 4 | Example 5 |
| 7d compressive strength (Mpa) | 31.1 | 30.2 | 30.5 | 30.4 | 30.2 |
| 28d compressive strength (Mpa) | 35.6 | 34.2 | 33.2 | 33.9 | 33.8 |
| Coefficient of water penetration (mm/s) | 3.1 | 4.1 | 5.3 | 3.9 | 5.4 |
As can be seen from the above table, the corrosion resistance strength and the water permeability coefficient of the concrete of example 1 are superior to those of examples 2-5, so that the compressive strength and the water permeability coefficient of the obtained steel slag concrete are good when 125 parts of cement, 135 parts of steel slag, 90 parts of water, 75 parts of fly ash, 100 parts of sodium ethylene diamine tetracetate, 9 parts of stannous chloride and 15 parts of polyacrylamide are added.
Comparative example 1
Based on the concrete of the embodiment 1, the high-strength steel slag concrete does not contain sodium ethylene diamine tetracetate, and the rest operation steps and parameters are the same as those of the embodiment 1.
Comparative example 2
Based on the concrete of the embodiment 1, no reducing agent is added into the concrete raw materials, and the rest operation steps and parameters are the same as the embodiment 1.
Comparative example 3
Based on the concrete of the embodiment 1, a high-strength steel slag concrete is prepared by adding no flocculant to the concrete raw materials, and the rest of the operation steps and parameters are the same as those of the embodiment 1.
Example 6
Based on the embodiment 1, the reducing agent is oxalic acid, and the rest operation steps and parameters are the same as those of the embodiment 1.
Example 7
On the basis of the embodiment 1, sodium borohydride is selected as a reducing agent, and the rest operation steps and parameters are the same as those of the embodiment 1.
Example 8
Based on the embodiment 1, the high-strength steel slag concrete is prepared by selecting aluminum sulfate as a flocculant, and the rest operation steps and parameters are the same as those in the embodiment 1.
Example 9
Based on the embodiment 1, the high-strength steel slag concrete is prepared by selecting polyaluminium chloride as a flocculating agent, and the rest operation steps and parameters are the same as those of the embodiment 1.
The concrete with steel slag obtained in comparative examples 1 to 3 and examples 6 to 9 were tested for compressive strength and permeability resistance. The test results are shown in table 3.
Table 3, test results of the compression strength and permeation resistance test of comparative examples 1 to 3 and examples 6 to 9.
As can be seen from the above table, the concrete with steel slag obtained in examples 1 to 5 has better compression strength and permeability resistance than those of comparative examples 1 to 3 and examples 6 to 8. As can be seen from the example 1 and the comparative example 1, when sodium ethylene diamine tetracetate is not added into the steel slag concrete, the compressive strength of the steel slag concrete in 7d and 28d is lower, and the water seepage performance is poorer, so the strength of the steel slag concrete can be obviously improved by adding the sodium ethylene diamine tetracetate.
As can be seen from the comparison between example 1 and comparative example 2, when no reducing agent is added to the concrete raw material, the compressive strength of the finally obtained steel slag concrete is significantly lower, so that the compressive strength of the steel slag concrete can be increased by adding the reducing agent.
As can be seen from the comparison between example 1 and comparative example 3, when no flocculant is added to the concrete raw material, the compressive strength and the water permeability of the finally prepared steel slag concrete are not very good, so that it can be concluded that the flocculant can obviously improve the compressive strength and the water permeability of the steel slag, thereby improving the strength of the steel slag concrete.
It can be seen from the comparison between example 1 and examples 6 and 7 that the strength of the slag concrete is affected when the reducing agent is sodium borohydride or oxalic acid, wherein the anti-permeability performance of the slag concrete is lower when oxalic acid is added, the strength of the slag concrete is lower when sodium borohydride is added, and the anti-permeability performance of the slag concrete can be improved by only adding stannous chloride.
As can be seen from the comparison between example 1 and examples 8 and 9, the added flocculant is aluminum sulfate or polyaluminium chloride, which can not improve the strength of the steel slag concrete, and the added aluminum sulfate or polyaluminium chloride steel slag concrete has lower strength and permeability resistance, so the flocculant is selected from polyacrylamide, which can make the compressive strength of the steel slag concrete best.
Comparative example 4
Based on the embodiment 1, the high-strength steel slag concrete is prepared by not adding the early strength agent into concrete raw materials, and the rest operation steps and parameters are the same as those of the embodiment 1.
Example 10
Based on the embodiment 1, the steel slag concrete with high strength has the grain size of 3mm, and the rest of the operation steps and parameters are the same as those in the embodiment 1.
Example 11
Based on the embodiment 1, the steel slag concrete with high strength has the grain size of 5mm, and the rest of the operation steps and parameters are the same as those of the embodiment 1.
Example 12
Based on the embodiment 1, the high-strength steel slag concrete has the steel slag grain diameter of 9mm, and the rest of the operation steps and parameters are the same as those in the embodiment 1.
Example 13
Based on the embodiment 1, the high-strength steel slag concrete has the steel slag particle size of 13mm, and the rest of the operation steps and parameters are the same as those in the embodiment 1.
The concrete with steel slag obtained in comparative example 4 and examples 10 to 13 was tested for compressive strength and permeability resistance. The test results are shown in table 4.
Table 4, test results of the compression strength and permeation resistance test of comparative examples 1 to 3 and examples 6 to 9.
It can be seen from the experimental results in table 4 that, in comparative example 1 and comparative example 4, when the early strength agent is not added to the steel slag concrete, the compressive strengths of 7d and 28d of the steel slag concrete are not very different, and the compressive strength is not high, so that the early strength of the steel slag concrete can be improved by adding the early strength agent, and the later strength of the steel slag concrete can be improved.
As can be seen from examples 1 and 10 to 13, the compressive strength of the steel slag is low when the selected steel slag has a particle size of less than 5mm or greater than 9mm, and is significantly improved when the selected steel slag has a particle size of 5mm or 9mm, but not very good, and when the selected steel slag has a particle size of 7mm, the strength of the steel slag concrete is the best when the steel slag is added to the concrete.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (6)
1. The high-strength steel slag concrete is characterized in that: the material is prepared by stirring and mixing the following raw materials in parts by weight:
100 portions of cement and 150 portions of cement,
120 portions of steel slag and 150 portions of,
70-120 parts of water, namely,
70-80 parts of fly ash,
the strength reinforcing agent comprises 90-110 parts of sodium ethylene diamine tetracetate; the strength reinforcing agent comprises 7-11 parts of reducing agent; the reducing agent is stannous chloride.
2. The high strength steel slag concrete according to claim 1, characterized in that: the strength enhancer comprises 10-20 parts of flocculant.
3. The high-strength steel slag concrete according to claim 2, characterized in that: the flocculant is polyacrylamide.
4. The high strength steel slag concrete according to claim 1, characterized in that: the strength reinforcing agent comprises 5-7 parts of an early strength agent.
5. The high strength steel slag concrete according to claim 1, characterized in that: the grain size of the steel slag is 5-9 mm.
6. The method for preparing high-strength steel slag concrete according to any one of claims 1 to 5, characterized in that:
s1: and mixing the strength enhancer, the steel slag, the cement, the water and the fly ash, and uniformly mixing to obtain the steel slag concrete.
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