CN109879650A - It is a kind of to substitute iron tailing concrete and preparation method thereof entirely - Google Patents
It is a kind of to substitute iron tailing concrete and preparation method thereof entirely Download PDFInfo
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- CN109879650A CN109879650A CN201910283576.6A CN201910283576A CN109879650A CN 109879650 A CN109879650 A CN 109879650A CN 201910283576 A CN201910283576 A CN 201910283576A CN 109879650 A CN109879650 A CN 109879650A
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Abstract
The present invention relates to a kind of full substitution iron tailing concretes and preparation method thereof, which substitutes normal concrete coarse aggregate with iron tailings ball, substitutes fine aggregate with iron tailings powder, mix water and is prepared by water-reducing agent；Its each component mass percent is as follows: cement 14.1%~17.2%, iron tailings ball 42.3%~51.7%, iron tailings powder 28.2%~34.5%, water-reducing agent 0.14%~0.17% and water 5.2%~6.4%.Full substitution iron tailing concrete iron tailings replacing whole aggregate of the invention, i.e. substitution rate greatly improved the recovery utilization rate of iron tailings up to 100%, it " turned waste into wealth ".
Description
Technical field
The invention belongs to technical field of concrete, are related to full substitution iron tailing concrete of one kind and preparation method thereof.
Background technique
With the accelerated development that Chinese Urbanization is built, construction material expense increases severely, the natural resources such as natural sand stone
A large amount of exploitations seriously destroy ecological environment, and these resources are non-renewable in a short time, so that buildings and resources shortage
Contradiction becomes increasingly conspicuous, and therefore, it is very urgent to find suitable alternative materials.
Tailing is the solid waste that bargh is dumped during extractive metallurgy primary raw material, and general heap is stored in tail
In mine library, environment, but also land occupation resource are not only polluted in a large amount of stockpilings of tailing.Mill tailings is applied to concrete production
Technical field, can not only make the mine of original resource exhaustion or inadequate resource again becomes the recovery of new resources base and extension life
It produces, and the sciemtifec and technical sphere of new material can be opened up, Promote Technology, while being also conducive to alleviate environmental pollution, improve ecology
Environment.
At present since corresponding chemical process technology is still immature, contacted between production, teaching & research not closely, enterprise innovation investment is weary
A series of reasons such as power lead to making a low multiple use for China's tailing.
It is using iron tailings as mixed mostly from the point of view of the status of technical field of concrete production is applied to by iron tailings with regard to China
The substitute of solidifying soil fine aggregate, and substitution rate is limited, such as Chinese patent 107399948A discloses a kind of admixture iron tailings sand
Strong concrete, iron tailings substitution rate is about 22%.One kind disclosed in Chinese patent 101671146A is part or all of
Replace the full substitution iron tailing concrete of natural aggregate, this method is only to processing barren rocks by making after cleaning, broken, screening
For aggregate.
Mechanical property is concentrated mainly on to the experimental study of full substitution iron tailing concrete both at home and abroad at present, to anti-permeability performance
It is still few with the research of microscopic feature.Impermeability be measure endurance performance of concrete important indicator, and mechanical performance of concrete and
Endurance quality each depends on its microstructure characteristic parameter.Therefore, research microstructure characteristic is applied to tailing concrete real
It is of great significance in the engineering of border.
Summary of the invention
The object of the present invention is to provide a kind of full substitution iron tailing concretes and preparation method thereof, greatly improve iron tailings
Comprehensive utilization ratio, and noxious material can effectively be closed, promote the Green Sustainable of construction material.
The present invention provides a kind of full substitution iron tailing concrete, and each component mass percent is as follows: cement 14.1%~
17.2%, iron tailings ball 42.3%~51.7%, iron tailings powder 28.2%~34.5%, water-reducing agent 0.14%~0.17% and water
5.2%~6.4%.
In full substitution iron tailing concrete of the invention, the cement is 42.5# ordinary portland cement, and density is
3000kg/m3。
In full substitution iron tailing concrete of the invention, the iron tailings powder is pulverized by tailings stone to be made, specific surface area
For 340m2/ kg, fineness are 200~400 mesh.
In full substitution iron tailing concrete of the invention, the iron tailings ball is by mine tailing, cement and water using centrifugation
Moulding process is simultaneously formed through natural curing, and the partial size of iron tailings ball is 5~16mm, and iron tailings ball each component mass percent is such as
Under: mine tailing 60%~80%, cement 15%~25%, water 5%~15%.
In full substitution iron tailing concrete of the invention, the water-reducing agent is high-efficiency polycarboxylic acid water reducer, efficient poly- carboxylic
The doping level of sour water-reducing agent is the 1% of cement quality.
The present invention provides a kind of preparation method of full substitution iron tailing concrete, includes the following steps:
Step 1: iron tailings stone being pulverized, specific surface area is made as 340m2/ kg, fineness are the iron tailings of 200~400 mesh
Powder；
Step 2: it weighs by following mass percent: iron tailings powder 60%~80%, cement 15%~25%, water 5%~
15%, centrifugal molding process is used after iron tailings powder, cement and water are mixed and partial size is made as 5~16mm's through natural curing
Iron tailings ball；
Step 3: it weighs by following mass percent: cement 14.1%~17.2%, iron tailings ball 42.3%~51.7%,
Iron tailings powder 28.2%~34.5%, water-reducing agent 0.14%~0.17% and water 5.2%~6.4%；
Step 4: iron tailings ball, iron tailings powder and cement are poured into dry mixing 120s in blender；
Step 5, load weighted water-reducing agent is mixed with water, it is spare that mixed liquor is made after mixing evenly；
Step 6, mixed liquor step 5 made pours into blender, and mixing time is about 120s, until slurry is equal
It is even, then conserved 28 days through standard conditions, complete the preparation of full substitution iron tailing concrete.
In the preparation method of full substitution iron tailing concrete of the invention, the cement is 42.5# normal silicate water
Mud, density 3000kg/m3。
In the preparation method of full substitution iron tailing concrete of the invention, the water-reducing agent is High-efficiency polycarboxylic acid diminishing
Agent, the doping level of high-efficiency polycarboxylic acid water reducer are the 1% of cement quality.
Full substitution iron tailing concrete of one kind of the invention and preparation method thereof, can not only greatly improved the comprehensive of iron tailings
Utilization rate is closed, is turned waste into wealth, the shortage of resources and tailing land occupation stockpiling problem of traditional construction material are alleviated, and uses spherical thick bone
The form of material can effectively close noxious material, prevent secondary pollution, promote the Green Sustainable of construction material.
Detailed description of the invention
Fig. 1 is the bubble frequency and gassiness spirogram of normal concrete；
Fig. 2 is the bubble frequency and gassiness spirogram of full substitution iron tailing concrete of the invention.
Specific embodiment
The present invention is directed to find a kind of renewable construction material, a kind of green concrete is developed, to solve traditional architecture material
Expect the problem of shortage, and greatly improve the comprehensive utilization ratio of iron tailings, realizes " turning waste into wealth ", promote the green of building industry can
Sustainable development, while promoting china natural resources economizing type, pro-environmental society.
The present invention is using iron tailings powder centrifugation production balling-up, by iron tailings ball and the thick bone of iron tailings powder replacing whole concrete
Material and fine aggregate, significantly improve the comprehensive utilization ratio of iron tailings, and can effectively close noxious material, promote Building wood
The Green Sustainable of material.
The full substitution iron tailing concrete of one kind of the invention, each component mass percent are as follows: cement 14.1%~
17.2%, iron tailings ball 42.3%~51.7%, iron tailings powder 28.2%~34.5%, water-reducing agent 0.14%~0.17% and water
5.2%~6.4%.
When it is implemented, the cement is 42.5# ordinary portland cement, density 3000kg/m3。
When it is implemented, the iron tailings powder is pulverized by tailings stone and is made, specific surface area 340m2/ kg, fineness 200
~400 mesh.
When it is implemented, the iron tailings ball is by mine tailing, cement and water using centrifugal molding process and through natural curing
It forms, the partial size of iron tailings ball is 5~16mm, and iron tailings ball each component mass percent is as follows: mine tailing 60%~80%, water
Mud 15%~25%, water 5%~15%.
When it is implemented, the water-reducing agent is high-efficiency polycarboxylic acid water reducer, the doping level of high-efficiency polycarboxylic acid water reducer is water
The 1% of shale amount.
The preparation method of the full substitution iron tailing concrete of one kind of the invention, includes the following steps:
Step 1: iron tailings stone being pulverized, specific surface area is made as 340m2/ kg, fineness are the iron tailings of 200~400 mesh
Powder；
Step 2: it weighs by following mass percent: iron tailings powder 60%~80%, cement 15%~25%, water 5%~
15%, centrifugal molding process is used after iron tailings powder, cement and water are mixed and partial size is made as 5~16mm's through natural curing
Iron tailings ball；
Step 3: it weighs by following mass percent: cement 14.1%~17.2%, iron tailings ball 42.3%~51.7%,
Iron tailings powder 28.2%~34.5%, water-reducing agent 0.14%~0.17% and water 5.2%~6.4%；
Step 4: iron tailings ball, iron tailings powder and cement are poured into dry mixing 120s in blender；
Step 5, load weighted water-reducing agent is mixed with water, it is spare that mixed liquor is made after mixing evenly；
Step 6, mixed liquor step 5 made pours into blender, and mixing time is about 120s, until slurry is equal
It is even, then conserved 28 days through standard conditions, complete the preparation of full substitution iron tailing concrete.
When it is implemented, the cement is 42.5# ordinary portland cement, density 3000kg/m3。
When it is implemented, the water-reducing agent is high-efficiency polycarboxylic acid water reducer, the doping level of high-efficiency polycarboxylic acid water reducer is water
The 1% of shale amount.
Embodiment:
The full substitution iron tailing concrete is prepared by ordinary portland cement, iron tailings ball, iron tailings powder, water and water-reducing agent
It forms；Its each component mass percent is as follows:
Wherein, cement is 42.5# ordinary portland cement, density 3000kg/m3；Iron tailings powder specific surface area is
340m2/ kg, fineness are 200-400 mesh；The partial size of iron tailings ball is 5~16mm, passes through centrifugation by iron tailings powder, cement and water
Molding, since iron tailings ball is to use iron tailings powder for primary raw material production, concrete coarse aggregate and fine aggregate are with good
Good Interface adhesive strength, has refined inside concrete pore structure；Water-reducing agent is high-efficiency polycarboxylic acid water reducer, maximum water-reducing rate
Up to 40%, the present invention uses the doping level of cement quality 1%.
Full substitution iron tailing concrete number of the invention is T, and normal concrete number is C, carries out concrete power respectively
Learn performance, endurance quality and microporous structure token test.When it is implemented, the raw material for different batches is tried three times
It tests.
(1) cubic compressive strength is tested
1 compressive strength of concrete of table (MPa) table
As shown in Table 1, the compression strength of cubic compressive strength C > T, C are 1.14 times of T, although the compression strength of T is bad
In C, but it has still reached C40 intensity, meets code requirement, can be used as construction material use.
(2) splitting tensile test
Table 2 concrete splitting split tensile strength (MPa) table
As shown in Table 2, the tensile splitting strength of tensile splitting strength C > T, C are 1.16 times of T, the tensile splitting strength of T
Slightly below C.
(3) permeability is tested
3 concrete of table ventilative time and gas diffusivity table
As shown in Table 3, gas diffusivity T > C, so anti-air infiltration ability C > T.
(4) chloride permeability is tested
4 chloride diffusion coefficient of table
As shown in Table 4, chloride diffusion coefficient T > C, so anti-chlorine seeps ability C > T.
(5) concrete microporous structure token test
5 concrete microporous structure characteristic parameter of table
As shown in Table 5, air content T > C, specific surface area T > C, bubble frequency T > C, bubble mean chord C > T.
When studying bubble frequency, bubble chord length is divided into minizone one by one, in 0~60 μm of section with 10 μm for singly
Position divides, and divides, divides as unit of 300~500 μm of sections are by 50 μm, 500 as unit of 60~300 μm of sections are by 20 μm
~3000 μm of sections are divided as unit of 500 μm, and 3000~4000 μm are an individual section.Meanwhile it joined not same district
Between the ratio of the total air content of air content Zhan analyze together, as shown in Figure 1, Figure 2 it is found that can most influence air content accounting size in C
Section is 1000~3000 μm, and the section that air content accounting size can be most influenced in T is 0~30 μm and 60~100 μm.Pure tailing
Concrete does not allow to be also easy to produce chord length in the air pocket in 1500~3000 μm of sections, has more apertures in 0~20 μm of section yet
Minute bubbles.The specific surface area and bubble frequency of pure tailing concrete are much larger than normal concrete, and the mean chord of bubble is equal
Less than normal concrete, this is because mine tailing is made with tailing ball of same type of material, the two has good interface cohesion
Ability forms preferable interface in pure tailing inside concrete, refines the pore structure of inside concrete, so the bubble formed
It is small compared with normal concrete.
The foregoing is merely presently preferred embodiments of the present invention, the thought being not intended to limit the invention, all of the invention
Within spirit and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of full substitution iron tailing concrete, which is characterized in that its each component mass percent is as follows: cement 14.1%~
17.2%, iron tailings ball 42.3%~51.7%, iron tailings powder 28.2%~34.5%, water-reducing agent 0.14%~0.17% and water
5.2%~6.4%.
2. full substitution iron tailing concrete as described in claim 1, which is characterized in that the cement is the common silicic acid of 42.5#
Salt cement, density 3000kg/m3。
3. full substitution iron tailing concrete as described in claim 1, which is characterized in that the iron tailings powder is pulverized by tailings stone
It is made, specific surface area 340m2/ kg, fineness are 200~400 mesh.
4. full substitution iron tailing concrete as described in claim 1, which is characterized in that the iron tailings ball is by mine tailing, water
Mud and water are formed using centrifugal molding process and through natural curing, and the partial size of iron tailings ball is 5~16mm, iron tailings ball each component
Mass percent is as follows: mine tailing 60%~80%, cement 15%~25%, water 5%~15%.
5. full substitution iron tailing concrete as described in claim 1, which is characterized in that the water-reducing agent subtracts for High-efficiency polycarboxylic acid
Aqua, the doping level of high-efficiency polycarboxylic acid water reducer are the 1% of cement quality.
6. a kind of preparation method of full substitution iron tailing concrete, which comprises the steps of:
Step 1: iron tailings stone being pulverized, specific surface area is made as 340m2/ kg, fineness are the iron tailings powder of 200~400 mesh；
Step 2: it weighs by following mass percent: iron tailings powder 60%~80%, cement 15%~25%, water 5%~15%,
The iron tail for using centrifugal molding process after iron tailings powder, cement and water are mixed and partial size being made as 5~16mm through natural curing
Mine ball；
Step 3: weighing by following mass percent: cement 14.1%~17.2%, iron tailings ball 42.3%~51.7%, iron tail
Miberal powder 28.2%~34.5%, water-reducing agent 0.14%~0.17% and water 5.2%~6.4%；
Step 4: iron tailings ball, iron tailings powder and cement are poured into dry mixing 120s in blender；
Step 5, load weighted water-reducing agent is mixed with water, it is spare that mixed liquor is made after mixing evenly；
Step 6, mixed liquor step 5 made pours into blender, and mixing time is about 120s, until slurry is uniform, then
It is conserved 28 days through standard conditions, completes the preparation of full substitution iron tailing concrete.
7. the preparation method of full substitution iron tailing concrete as claimed in claim 6, which is characterized in that it is characterized in that, institute
Stating cement is 42.5# ordinary portland cement, density 3000kg/m3。
8. the preparation method of full substitution iron tailing concrete as claimed in claim 6, which is characterized in that it is characterized in that, institute
Stating water-reducing agent is high-efficiency polycarboxylic acid water reducer, and the doping level of high-efficiency polycarboxylic acid water reducer is the 1% of cement quality.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111205038A (en) * | 2020-01-19 | 2020-05-29 | 河北农业大学 | Pumping total iron tailing concrete and preparation method thereof |
| CN113024196A (en) * | 2021-03-16 | 2021-06-25 | 东北大学 | Compression-resistant anti-chlorine-permeation concrete doped with iron tailing sand iron tailing ball and preparation method thereof |
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| JP2010047793A (en) * | 2008-08-20 | 2010-03-04 | Denki Kagaku Kogyo Kk | Solidifying material for enhancing hot strength for ore powder, pellet of ore powder using the same and method for producing the same |
| CN108191319A (en) * | 2018-02-27 | 2018-06-22 | 王福州 | A kind of iron tailings sand concrete and preparation method thereof |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2010047793A (en) * | 2008-08-20 | 2010-03-04 | Denki Kagaku Kogyo Kk | Solidifying material for enhancing hot strength for ore powder, pellet of ore powder using the same and method for producing the same |
| CN108191319A (en) * | 2018-02-27 | 2018-06-22 | 王福州 | A kind of iron tailings sand concrete and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 中国建材检验认证集团股份有限公司等: "《水泥物理性能检验技术》", 30 November 2017, 中国建材工业出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111205038A (en) * | 2020-01-19 | 2020-05-29 | 河北农业大学 | Pumping total iron tailing concrete and preparation method thereof |
| CN113024196A (en) * | 2021-03-16 | 2021-06-25 | 东北大学 | Compression-resistant anti-chlorine-permeation concrete doped with iron tailing sand iron tailing ball and preparation method thereof |
| CN113024196B (en) * | 2021-03-16 | 2022-06-28 | 东北大学 | Compression-resistant anti-chlorine-permeation concrete doped with iron tailing sand iron tailing ball and preparation method thereof |
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Application publication date: 20190614 |
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