CN111646741B - Iron ore special concrete and preparation method thereof - Google Patents
Iron ore special concrete and preparation method thereof Download PDFInfo
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- CN111646741B CN111646741B CN202010601870.XA CN202010601870A CN111646741B CN 111646741 B CN111646741 B CN 111646741B CN 202010601870 A CN202010601870 A CN 202010601870A CN 111646741 B CN111646741 B CN 111646741B
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
-
- 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
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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
- 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
- C04B14/30—Oxides other than silica
- C04B14/308—Iron oxide
-
- 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
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/023—Fired or melted materials
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- 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
Abstract
The application discloses iron ore stone special concrete and preparation method thereof belongs to the technical field of concrete preparation, solves the problem that the conventional concrete wear resistance does not meet the use requirement of special environment in the prior art, and the technical essential is that: the iron ore special concrete is characterized by comprising the following components in parts by weight: iron ore stone coarse aggregate: 900 portion and 1160 portion; ceramic fine aggregate: 600-780 parts; water: 135-165 parts; cement: 310-380 parts; 230 portions and 285 portions of mineral admixture; water reducing agent: 8.5 to 10.2 portions. By adopting the scheme, the iron ore has stronger wear resistance and strength, so that the strength and the wear resistance of the concrete can be effectively improved when the iron ore is used as the main aggregate of the concrete, the surface area of the ceramic fine aggregate is larger, the binding with the cementing material is stronger, and the ceramic fine aggregate is distributed in the gap of the coarse aggregate, so that the ceramic fine aggregate is more tightly bonded with the iron ore coarse aggregate by virtue of the cementing material, and the concrete has better stability and wear resistance.
Description
Technical Field
The application relates to the technical field of concrete preparation, in particular to iron ore special concrete and a preparation method thereof.
Background
Pier in the bridge engineering in rivers, lakes, coastal shore areas and desert Gobi areas, the same place as infrastructure in inland areas generally adopts reinforced concrete materials as main structural materials, but because continuous water flow scouring and flying sand scouring exist in rivers, desert Gobi areas, the situations of ship touch, impact and the like can even occur, so that the general concrete materials are easy to seriously wear after forming the main structure and using for a period of time, further the service life of the reinforced concrete structure in the environment can not be ensured for a long time, and hidden dangers are brought to the safety and the stability of the infrastructure.
Disclosure of Invention
In order to realize that a concrete material has stronger stability and wear resistance when forming a building structure and has enough service life when being used in a special area, the application provides the iron ore special concrete and the first aspect of the preparation method thereof, and the application provides the iron ore special concrete, and adopts the following technical scheme:
the iron ore special concrete comprises the following components in parts by weight: iron ore stone coarse aggregate: 900 portion and 1160 portion; ceramic fine aggregate: 600-780 parts; water: 135-165 parts; cement: 310-380 parts; 230 portions and 285 portions of mineral admixture; water reducing agent: 8.5 to 10.2 portions.
By adopting the technical scheme, because the iron ore stone coarse aggregate has stronger wear resistance and strength compared with the common broken stone aggregate, the strength and the wear resistance of the concrete can be effectively improved when the iron ore stone coarse aggregate is used as the main aggregate of the concrete, meanwhile, the single particle of the selected ceramic fine aggregate is coarser than the conventional river sand particle, further has larger surface area, certain water absorption capacity and stronger bonding capacity when being combined with cementing materials such as cement, and the ceramic fine aggregate is distributed in the gaps of the iron ore coarse aggregate, thereby further leading the ceramic fine aggregate to form a tighter bonding relation with the iron ore coarse aggregate outside by means of the cementing material, finally showing that the concrete has better stability and wear resistance, the comparative analysis of the performance test data of example 7 and comparative example 1, and the comparative analysis of the performance test data of example 3 and comparative example 2 can also be performed.
Preferably, the magnetic powder is further included, and the weight portion of the magnetic powder is 65-100 portions.
By adopting the technical scheme, the magnetic powder mixed into the cementing material during preparation can also generate magnetic attraction with the iron ore coarse aggregate when the cementing material is used for bonding the iron ore coarse aggregate, so that the connection effect between the iron ore coarse aggregate and the iron ore coarse aggregate is improved, the bonding of the aggregate on concrete is finally reflected to be firmer, namely, the stability and the wear resistance are stronger, and the result can also be reflected through performance detection data of the embodiment 7 and the embodiment 3.
Preferably, the iron ore stone coarse aggregate adopts continuous gradation, and the particle size ranges from 6 mm to 20 mm.
Preferably, the ceramic fine aggregate adopts continuous gradation, and the particle size range is 1-5 mm.
By adopting the technical scheme, gaps among the continuously graded aggregate particles are smaller than gaps among the discontinuously graded aggregate particles, and finally the prepared concrete is more compact, and the aggregates are bonded more tightly, so that the concrete has stronger stability, the aggregates are not easy to fall off, and the concrete has better wear resistance, and the result can be reflected by analyzing performance detection data of the embodiment 3 and the comparative example 3.
Preferably, the mineral admixture comprises the following components in parts by weight: 80-100 parts of fly ash; 110 portions and 130 portions of mineral powder; 40-55 parts of silica fume.
By adopting the technical scheme, the addition of the fly ash can achieve the effect of reducing the cement dosage, the spherical glass body contained in the fly ash can effectively reduce the yield shear stress of the mixture, and further the mixture has larger fluidity, the mineral powder can achieve the effects of reducing the cement dosage and reducing the adiabatic temperature rise, meanwhile, the construction performance of the concrete can be effectively improved, and the later strength of the concrete and the durability of resisting sulfate corrosion, chloride dialysis and the like are improved.
Preferably, the solid content of the adopted water reducing agent is 20%, and the water reducing rate is more than 30%.
By adopting the technical scheme, the high-efficiency water reducing agent is selected to further improve the fluidity of the prepared concrete, so that the pumping performance of the concrete in the subsequent working process is ensured.
In a second aspect, the application provides a preparation method of iron ore special concrete, which adopts the following technical scheme: the preparation method of the iron ore special concrete comprises the following steps:
s1: putting cement, mineral admixture, magnetic powder, ceramic fine aggregate, water and water reducing agent into a concrete mixer for stirring to obtain mortar;
s2: and putting the iron ore coarse aggregate into the mortar obtained in the step S1, and stirring to obtain the iron ore special concrete.
Preferably, step S1 includes the steps of:
s 1: the cement, the mineral admixture, the magnetic powder and the ceramic fine aggregate are dry-mixed in a concrete mixer and uniformly mixed to obtain a mixed material;
s 2: and (5) adding 80% of the required water into the mixture obtained in s1, stirring for 30s, adding the water reducing agent and the rest 20% of water without stopping the concrete mixer after stirring, and continuously stirring for 90 s-120 s after the addition is finished until the mixture is slurried.
By adopting the technical scheme, the magnetic powder, the ceramic fine aggregate, the mineral admixture and the cement are firstly stirred, so that the magnetic powder and other cementing materials are fully attached to the ceramic fine aggregate, and then after the iron ore coarse aggregate is subsequently added, the quantity of the magnetic powder which is bonded and distributed outside the ceramic fine aggregate is larger, so that the connection relation between the fine aggregate and the coarse aggregate is better formed, and finally the obtained concrete aggregate has stronger connection relation, so that the concrete aggregate has better stability and wear resistance, and the result can be reflected by the concrete performance detection data obtained in the embodiment 3 and the comparative example 4.
To sum up, the beneficial technical effect of this application does:
(1) when the ceramic fine aggregate is used for matching and filling gaps among the iron ore coarse aggregates, the connection among the whole aggregates is more stable and compact by means of the stronger adsorption and bonding capacity of the ceramic fine aggregate particles, and the wear resistance of the concrete is enhanced;
(2) the magnetic powder realizes that the coarse aggregate and the cementing material have a magnetic attraction effect for improving the connection relation in addition to the bonding relation, so that the connection stability between the aggregates is further improved;
(3) the magnetic powder, the fine aggregate, the cementing material and the like are firstly stirred, so that more magnetic powder is carried outside the ceramic fine aggregate particles, the connection relation between the two aggregates is further enhanced, and the wear resistance and the stability of the concrete are finally improved.
Detailed Description
The present application will be described in further detail with reference to examples and comparative examples.
Example 1
The application discloses an iron ore special concrete which comprises the components in parts by weight shown in table 1. Wherein, the iron ore stone coarse aggregate adopts continuous gradation, and the particle size range is 6-20 mm; the ceramic fine aggregate is selected from continuous gradation, and the particle size range is 1-5 mm; the solid content of the adopted water reducing agent is 20 percent, and the water reducing rate is more than 30 percent.
The preparation method of the iron ore special concrete comprises the following steps:
s1: putting cement, fly ash, mineral powder, silica fume, magnetic powder, ceramic fine aggregate, part of water and a water reducing agent into a concrete mixer for stirring to obtain mortar;
s2: putting the iron ore coarse aggregate and part of water into a concrete mixer for stirring to obtain iron ore coarse aggregate subjected to rust resistance treatment;
wherein, the process of S1 includes the following steps:
s 1: stirring cement, magnetic powder, mineral admixture and ceramic fine aggregate in a concrete mixer for 30s to obtain a mixed material;
s 2: and (5) adding 80% of the required water into the mixture obtained in the step s1, stirring for 30s, adding the water reducing agent and the rest 20% of water without stopping the concrete mixer after stirring, and continuously stirring for 90 s-120 s after the addition is finished until the mixture is slurried.
Examples 2 to 7
The difference from the example 1 is that the weight parts of each component are different, and the specific numerical values are shown in the table 1.
Comparative example 1
The difference from example 7 is that the coarse aggregate of this comparative example is a crushed stone coarse aggregate which is commonly used in the preparation of concrete, and the weight parts thereof are the same as those of the iron ore based coarse aggregate in example 7.
Comparative example 2
The difference from example 3 is that the fine aggregate of this comparative example is river sand fine aggregate which is commonly used in the preparation of concrete, and the weight parts thereof are the same as those of the ceramic fine aggregate in example 3.
Comparative example 3
The difference from example 3 is that the iron ore coarse aggregate and the ceramic fine aggregate in the comparative example are both in discontinuous gradation.
Comparative example 4
The difference from example 3 is that the preparation method of the iron-ore concrete used in the present comparative example is:
s1, putting cement, mineral admixture, magnetic powder, iron ore coarse aggregate and ceramic fine aggregate into a concrete mixer together for dry mixing, and obtaining mixed material after uniform mixing;
and S2, adding 80% of the required water into the mixture obtained in the step S1, uniformly stirring, adding the water reducing agent and the rest 20% of water without stopping the concrete mixer after stirring, and uniformly stirring to obtain the iron ore special concrete.
Table 1: schematic table of the parts by weight of each component in the concrete prepared in the different examples and comparative examples
Performance detection test:
and (3) performing a compression strength test and an abrasion resistance test on the prepared different concretes, wherein the abrasion resistance test adopts an air sand gun abrasion method (refer to hydraulic concrete test regulation DL-T5150) 2001), the concrete test piece is a cube of 15cm multiplied by 15cm, each group comprises three blocks, curing is performed according to a standard method (the temperature is 20 ℃ plus or minus 2 ℃ and the relative humidity is more than 95% RH) after forming, and the abrasion resistance test is performed at 28 days. The test attack angle is 35 degrees, and the wind pressure is 0.3 MPa. The performance results obtained are shown in Table 2, where the abrasion resistance strength is the time (h/cm) required for each 1cm of the test piece to be abraded.
Table 2: performance test data sheet
It can be seen by combining the performance test data of the embodiments 3 and 7 that under the condition that other components and the preparation method are not changed, the anti-abrasion strength and the compressive strength of the finally prepared concrete can be effectively improved by mixing the magnetic powder during the preparation, and the main factor for realizing the process is that the magnetic powder mixed into the cementing material such as cement and the like also generates a magnetic attraction effect with the iron ore coarse aggregate when the cementing material bonds the iron ore coarse aggregate, so that the connection effect between the two is improved, and the final reaction is that the bonding of the aggregate on the concrete is firmer, namely the stability and the abrasion resistance are stronger.
By combining the performance test data of example 7 and comparative example 1, it can be seen that, under the condition that other components and preparation methods are not changed, the iron ore coarse aggregate used as the coarse aggregate in the preparation of the concrete can obviously improve the anti-abrasion strength and the compressive strength of the concrete, because the iron ore coarse aggregate has stronger wear resistance and strength compared with the common crushed stone aggregate, the iron ore coarse aggregate can effectively improve the strength and the wear resistance of the concrete.
Combining the performance test data of the embodiment 3 and the comparative example 2, it can be seen that, under the condition of keeping other components and preparation methods unchanged, the fine aggregate is made of ceramic, which is used for preparing concrete, so that the impact and abrasion resistance of the concrete is remarkably improved, because the single particle of the ceramic fine aggregate is coarser compared with the conventional river sand particle, and further has a larger surface area and a certain water absorption capacity, the bonding capacity is stronger when the ceramic fine aggregate is combined with cementing materials such as cement, and the ceramic fine aggregate is also strongly combined with magnetic powder mixed in the cementing materials, on the other hand, the ceramic fine aggregate is distributed in the gap of the iron ore coarse aggregate, so that the ceramic fine aggregate and the iron ore coarse aggregate form a tighter bonding relation by virtue of the cementing materials and the magnetic powder, the magnetic powder further brings a magnetic attraction effect between the magnetic powder and the iron ore coarse aggregate, and further the connection relation between the concrete aggregates is more stable, and the wear-resistant rubber plate has stronger stability and wear resistance.
By combining the example 3 and the comparative example 3, it can be seen that the concrete prepared by the selected iron ore coarse aggregate and the ceramic fine aggregate in the continuous gradation has better compression resistance and wear resistance while other conditions are kept unchanged. The gaps among the continuously graded aggregate particles are smaller than those among the discontinuously graded aggregate particles, so that the prepared concrete is more compact, the aggregates are bonded more tightly and are not easy to fall off, and the wear resistance is better.
By combining example 3 with comparative example 4, it can be seen that the concrete prepared by the procedure of example 3 has better stability and wear resistance when the concrete is prepared, while maintaining other conditions. Compared with the conventional preparation method of mixing all the materials in the comparative example 4, in the example 3, the magnetic powder, the ceramic fine aggregate, the mineral admixture and the cement are firstly mixed, so that the magnetic powder and other cementing materials are fully adhered to the ceramic fine aggregate, and then after the iron ore coarse aggregate is subsequently added, the quantity of the magnetic powder which is adhered and distributed outside the ceramic fine aggregate is larger, so that the connection relationship between the fine aggregate and the coarse aggregate is better formed, and finally, the prepared concrete aggregate has stronger connection relationship, so that the concrete aggregate has better stability and wear resistance.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (6)
1. The iron ore special concrete is characterized by comprising the following components in parts by weight:
iron ore stone coarse aggregate: 900 portion and 1160 portion;
ceramic fine aggregate: 600-780 parts;
water: 135-165 parts;
cement: 310-380 parts;
230 portions and 285 portions of mineral admixture;
water reducing agent: 8.5-10.2 parts;
the magnetic powder is 65-100 parts by weight;
the mineral admixture comprises the following components in parts by weight:
80-100 parts of fly ash;
110 portions and 130 portions of mineral powder;
40-55 parts of silica fume.
2. The iron ore special concrete according to claim 1, characterized in that: the iron ore stone coarse aggregate is continuously graded, and the particle size range is 6-20 mm.
3. The iron ore special concrete according to claim 1, characterized in that: the ceramic fine aggregate adopts continuous gradation, and the particle size range is 1-5 mm.
4. The iron ore special concrete according to claim 1, characterized in that: the solid content of the adopted water reducing agent is 20 percent, and the water reducing rate is more than 30 percent.
5. The method for preparing the iron ore special concrete according to any one of claims 1 to 4, which is characterized by comprising the following steps:
s1: putting cement, mineral admixture, magnetic powder, ceramic fine aggregate, water and water reducing agent into a concrete mixer for stirring to obtain mortar;
s2: and putting the iron ore coarse aggregate into the mortar obtained in the step S1, and stirring to obtain the iron ore special concrete.
6. The method for preparing the iron ore special concrete according to claim 5, wherein the method comprises the following steps: step S1 includes the following steps:
s 1: the cement, the mineral admixture, the magnetic powder and the ceramic fine aggregate are dry-mixed in a concrete mixer and uniformly mixed to obtain a mixed material;
s 2: and (5) adding 80% of the required water into the mixture obtained in s1, stirring for 30s, adding the water reducing agent and the rest 20% of water without stopping the concrete mixer after stirring, and continuously stirring for 90 s-120 s after the addition is finished until the mixture is slurried.
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| CN112185485B (en) * | 2020-09-24 | 2023-07-07 | 广西大学 | Design method for mixing proportion of space two-phase concrete |
| CN112299872A (en) * | 2020-11-13 | 2021-02-02 | 中国电建集团贵阳勘测设计研究院有限公司 | Cemented sand gravel and preparation method thereof |
| CN114319871B (en) * | 2021-12-09 | 2022-11-04 | 浙江大学 | Surface treatment method for concrete containing ferromagnetic aggregate |
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