CN107500650A - A kind of iron tailings sand self-compacting concrete and preparation method thereof - Google Patents
A kind of iron tailings sand self-compacting concrete and preparation method thereof Download PDFInfo
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- CN107500650A CN107500650A CN201710775622.5A CN201710775622A CN107500650A CN 107500650 A CN107500650 A CN 107500650A CN 201710775622 A CN201710775622 A CN 201710775622A CN 107500650 A CN107500650 A CN 107500650A
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- tailings sand
- concrete
- iron tailings
- compacting concrete
- self
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Classifications
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention relates to the construction material technical field of concrete preparation in civil engineering, specifically discloses a kind of iron tailings sand self-compacting concrete and preparation method thereof, the iron tailings sand self-compacting concrete is with 1m3Concrete meter, including following component：Cement：620 660Kg, flyash：110 130Kg, water：220 280Kg, CHARACTERISTICS OF TAILINGS SAND：720 790Kg, stone：800 900Kg, water reducer：5 10Kg, the present invention uses the mobile performance of concrete material made from discarded object iron tailings sand, and compression strength is satisfied by the Essential Performance Requirements of concrete material, can be as the material of general concrete supporting member, the twice laid of discarded object is realized, reduces the pollution to environment.
Description
Technical field
The present invention relates to the construction material technical field of concrete preparation in civil engineering, more particularly to a kind of iron tailings sand
Self-compacting concrete and preparation method thereof.
Background technology
Currently, the mine tailing amount of China's stockpiling is up to more than ten00000000 tons, and also to discharge nearly 300,000,000 tons of mine tailing, it is necessary to build every year
Tailings Dam is stored up, and does not only take up a large amount of soils, spends substantial amounts of manpower and materials to be safeguarded, and pollutes environment.
In terms of construction industry, currently used most construction materials are exactly concrete, but for using concrete institute
Some problems of trip can't solve well, for example voids and pits phenomenon occur, be gone out due to concreting leakiness
Existing hole etc., many troubles are brought to construction, certain infringement is also caused to building.
Therefore, a kind of new construction material prepared using discarded object is researched and developed, it is dirty can to solve current environment
Dye problem, and can reduce current construction material the problem that, this is the current urgent problem to be solved in China.
The content of the invention
It is difficult to handle for existing waste tailings, pollutes the problems such as environment, the present invention provides a kind of iron tailings sand from close
Real concrete.
Further, the present invention also provides a kind of preparation method of iron tailings sand self-compacting concrete.
To achieve the above object of the invention, the embodiment of the present invention employs following technical scheme：
A kind of iron tailings sand self-compacting concrete, including following component：With 1m3Concrete meter, including following component：Cement：
620-660 Kg, flyash：110-130Kg, water：220-280 Kg, CHARACTERISTICS OF TAILINGS SAND：720-790 Kg, stone：800-900 Kg,
Water reducer：5-10 Kg.
Relative to prior art, the advantage of iron tailings sand self-compacting concrete provided by the invention is as follows：
（1）The present invention is using iron tailings sand substitution natural sand, on the one hand, can increase comprehensive profit of the iron tailings in terms of building materials
With reducing the stockpiling of iron tailings, the environment of the engineering costs such as dam, flood control, also improvement mining area is built in saving, makes full use of resource；
On the other hand, the use of iron tailings sand, the advantages of iron tailings sand self-compacting concrete intensity is high, and mobility is strong, tool can be assigned
Body, the expansions degree that collapses is 700mm ~ 760mm, and T500 flowing times are more than 2s, 28 days cubic compressive strengths for 60 ~
70MPa, workability is good, and reduction is manually vibrated, and reaches the effect of self-compaction；
（2）The present invention prepares self-compacting concrete using discarded object, contributes to China's energy-saving and emission-reduction, is looked forward to simultaneously for local iron ore
The development in pluralism of industry, the economic benefit of enterprise is improved, improved the ecological environment significant, also the development tool to construction industry
There is impetus.
Further, the present invention also provides the preparation method of the iron tailings sand self-compacting concrete.The preparation method, extremely
Comprise the following steps less：
Step 1, according to above-mentioned raw material proportioning weigh each component；
Step 2, by the cement, flyash, CHARACTERISTICS OF TAILINGS SAND, stone carry out mixing treatment, obtain the first batch mixing；
Step 3, water reducer, 30-50wt% water, stirring are added into first batch mixing；
Step 4, remaining water is added into first batch mixing, stirred.
Relative to prior art, the preparation method simple and fast of iron tailings sand self-compacting concrete provided by the invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
The embodiment of the present invention provides a kind of iron tailings sand self-compacting concrete, with 1m3Concrete meter, including following component：
Cement：620-660 Kg, flyash：110-130Kg, water：220-280 Kg, CHARACTERISTICS OF TAILINGS SAND：720-790 Kg, stone：800-900
Kg, water reducer：5-10 Kg.
The embodiment of the present invention uses the mobile performance of concrete material made from discarded object iron tailings sand, and compression strength is full
The Essential Performance Requirements of sufficient concrete material, the waste profit of discarded object as the material of general concrete supporting member, can be realized
With reducing the pollution to environment.
Preferably, the bulk density of the iron tailings sand is 1500-2000kg/m3, apparent density 2500-3000kg/
m3。
The surface area of mine tailing antiquated sand is bigger, and the demand of cement is smaller, and the intensity of concrete is higher, but modulus of fineness mistake
Gao Zehui causes concrete workability to decline, and occurs phenomena such as isolation, bleeding easily, so selection modulus of fineness is 3.0-
2.5。
Preferably, the strength of cement is P.O42.5, fineness >=300m2/ kg, loss on ignition≤5wt%.
Cement fineness is smaller, and fine grained is more, and the hydration rate of cement can be improved by increasing the specific surface area of cement, improves early
Phase intensity, particle is too small till that time, and aquation is too fast, can hardly promote the growth of late strength of concrete, make concrete on the contrary
The aquation thermal change of early stage is big, and the self-constriction of concrete and dry shrink increase.Therefore selection fineness >=300m2/kg。
The loss on ignition in cement is controlled, the infiltration capacity of gypsum and mixing material is actually limited, to ensure cement quality.
Cause the change of strength of cement and other Con trolling index when loss on ignition changes, therefore select loss on ignition≤5wt%.
Preferably, the flyash uses I grade of flyash, fineness 8-12m2/kg。
The activity of flyash is much weaker than clinker, and when substituting part of cement using flyash, aquation can join initial stage
It will be reduced with the clinker of aquation, and glue ratio then increases, thus cause the slump to increase, part is replaced using flyash
Cement and fine aggregate, it can be good at improving concrete work, and the effect of concrete work is also by with fineness of pulverized-coal ash
Reduce and increase.The fineness of flyash also has a certain impact to concrete pore rate simultaneously, and porosity is to concrete performance
Influence it is bigger, therefore select 8-12m2/kg。
Preferably, the particle diameter of the stone is 4.75-15mm.
Maximum size of coarse aggregate should not be too small, can influence the workability of concrete like that；But also should not be too big, otherwise can shadow
Concrete strength is rung, therefore the particle diameter of selection stone is 4.75-15mm.
Preferably, the water reducer is polycarboxylic acid series high efficiency water reducing agent.
High performance water reducing agent of polyocarboxy acid volume is low, and water-reducing rate is high, shrinks small, to increase substantially concrete early stage, later stage
Intensity and chloride ion content is low, alkali content is low, is advantageous to the durability of concrete.
The present invention still further provides the iron tailings sand certainly on the premise of the iron tailings sand self-compacting concrete is provided
The preparation method of air-free concrete.The preparation method, including at least following steps：
Step 1, according to above-mentioned raw material proportioning weigh each component；
Step 2, by the cement, flyash, CHARACTERISTICS OF TAILINGS SAND, stone carry out mixing treatment, obtain the first batch mixing；
Step 3, water reducer, 30-50wt% water, stirring are added into first batch mixing；
Step 4, remaining water is added into first batch mixing, stirred.
Explanation is further explained to above-mentioned preparation method below：
Preferably, 3-10min is stirred in the step 3.
Preferably, 3-10min is stirred in the step 4.
It is provided in an embodiment of the present invention in order to better illustrate, illustrated below by embodiment is further.
Embodiment 1
The present embodiment provides a kind of iron tailings sand self-compacting concrete, with 1m3Concrete meter, including following component：Cement：648
Kg, flyash：120Kg, water：276 Kg, CHARACTERISTICS OF TAILINGS SAND：744Kg, stone：864 Kg, water reducer：5.7 Kg.
Embodiment 2
The present embodiment provides a kind of iron tailings sand self-compacting concrete, with 1m3Concrete meter, including following component：Cement：
620Kg, flyash：113Kg, water：250 Kg, CHARACTERISTICS OF TAILINGS SAND：739Kg, stone：855 Kg, water reducer：6.4 Kg.
The ratio of the raw material of iron tailings sand self-compacting concrete is prepared below as embodiment 1,2, weighs each group respectively
The quality of the raw material divided is listed as follows, as shown in table 1.
The quality of the embodiment 1-2 raw material of table 1（kg）
| Embodiment 1 | Embodiment 2 | |
| Cement | 2.7 | 2.584 |
| Flyash | 0.50 | 0.472 |
| Water | 1.15 | 1.04 |
| Iron tailings sand | 3.10 | 3.08 |
| Stone | 3.60 | 3.564 |
| Water reducer | 0.0236 | 0.0268 |
The preparation method for the iron tailings sand self-compacting concrete that above-described embodiment provides comprises the following steps：
Step 1, according to concrete mix, determine raw material usage, weigh each component；
Step 2, using the method manually stirred, first add stone, iron tailings sand, P.O42.5 cement and I grade of flyash are stirred
Mix, stir 3 ~ 4 minutes, untill uniform；
Step 3, polycarboxylic acid series high efficiency water reducing agent is added, and add 50wt% water, stirred 5 ~ 6 minutes, make polycarboxylic acids high efficiency diminishing
Agent plays one's part to the full；
Step 4, remaining water is added, be sufficiently stirred, about stirred 5 minutes, water reducer is played one's part to the full, height is made
Strong iron tailings sand self-compacting concrete.
In order to better illustrate the characteristic of iron tailings sand self-compacting concrete provided in an embodiment of the present invention, will implement below
Iron tailings sand self-compacting concrete prepared by example 1,2 builds into 100mm × 100mm × 100mm test block by laying bricks or stones, according to《Common coagulation
Soil mechanics method for testing performance standard》GBT50081-2002 carries out compressive strength test, and acquired results are as shown in table 2.
Concrete material the performance test results are made in the embodiment 1-2 of table 2
| Embodiment 1 | Embodiment 2 | |
| T500 flowing times | 20s | 16s |
| Collapse expansion degree | 740mm | 760mm |
| Cubic compressive strength | 65.1MPa | 70MPa |
As can be seen from Table 2, the present invention uses the mobile performance of concrete material made from discarded object iron tailings sand, compression strength
The Essential Performance Requirements of concrete material are satisfied by, the useless of discarded object can be realized as the material of general concrete supporting member
Thing utilizes, and reduces the pollution to environment.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modification, equivalent substitution or improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (9)
- A kind of 1. iron tailings sand self-compacting concrete, it is characterised in that：With 1m3Concrete meter, including following component：Cement：620- 660Kg, flyash：110-130Kg, water：220-280Kg, CHARACTERISTICS OF TAILINGS SAND：720-790Kg, stone：800-900Kg, water reducer：5- 10Kg。
- 2. iron tailings sand self-compacting concrete as claimed in claim 1, it is characterised in that：The bulk density of the iron tailings sand For 1500-2000kg/m3, apparent density 2500-3000kg/m3。
- 3. iron tailings sand self-compacting concrete as claimed in claim 1, it is characterised in that：The intensity of the cement is P.O42.5, fineness >=300m2/ kg, loss on ignition≤5wt%.
- 4. iron tailings sand self-compacting concrete as claimed in claim 1, it is characterised in that：The flyash uses I grade of fine coal Ash, fineness 8-12m2/kg。
- 5. iron tailings sand self-compacting concrete as claimed in claim 1, it is characterised in that：The particle diameter of the stone is 4.75- 15mm。
- 6. iron tailings sand self-compacting concrete as claimed in claim 1, it is characterised in that：The water reducer is that polycarboxylic-acid is high Imitate water reducer.
- A kind of 7. preparation method of iron tailings sand self-compacting concrete, it is characterised in that：Including at least following steps：Step 1, according to the raw material proportioning as described in any one of claim 1 ~ 6 weigh each component；Step 2, by the cement, flyash, CHARACTERISTICS OF TAILINGS SAND, stone carry out mixing treatment, obtain the first batch mixing；Step 3, water reducer, 30-50wt% water, stirring are added into first batch mixing；Step 4, remaining water is added into first batch mixing, stirred.
- 8. the preparation method of iron tailings sand self-compacting concrete as claimed in claim 7, it is characterised in that：In the step 3 Stir 3-10min.
- 9. the preparation method of iron tailings sand self-compacting concrete as claimed in claim 7, it is characterised in that：In the step 4 Stir 3-10min.
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| CN201710775622.5A CN107500650A (en) | 2017-08-31 | 2017-08-31 | A kind of iron tailings sand self-compacting concrete and preparation method thereof |
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| CN201710775622.5A CN107500650A (en) | 2017-08-31 | 2017-08-31 | A kind of iron tailings sand self-compacting concrete and preparation method thereof |
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Cited By (3)
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|---|---|---|---|---|
| CN108191319A (en) * | 2018-02-27 | 2018-06-22 | 王福州 | A kind of iron tailings sand concrete and preparation method thereof |
| CN110498651A (en) * | 2019-09-20 | 2019-11-26 | 中条山有色金属集团有限公司 | A kind of concrete and preparation method thereof containing copper tailing |
| CN112456916A (en) * | 2020-12-09 | 2021-03-09 | 江苏昆腾新材料科技有限公司 | Preparation method of high-iron-tailing-sand-doped self-compacting concrete |
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| CN112456916A (en) * | 2020-12-09 | 2021-03-09 | 江苏昆腾新材料科技有限公司 | Preparation method of high-iron-tailing-sand-doped self-compacting concrete |
| CN112456916B (en) * | 2020-12-09 | 2022-03-08 | 江苏昆腾新材料科技有限公司 | Preparation method of high-iron-tailing-sand-doped self-compacting concrete |
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