CN104402335A - High-strength concrete employing magnetized reduced roasted iron-beneficiation tailings as admixture - Google Patents
High-strength concrete employing magnetized reduced roasted iron-beneficiation tailings as admixture Download PDFInfo
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- CN104402335A CN104402335A CN201410646201.9A CN201410646201A CN104402335A CN 104402335 A CN104402335 A CN 104402335A CN 201410646201 A CN201410646201 A CN 201410646201A CN 104402335 A CN104402335 A CN 104402335A
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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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention relates to high-strength concrete employing magnetized reduced roasted iron-beneficiation tailings as an admixture. The high-strength concrete comprises, in percent by mass, 12%-16% of cement, 4%-9% of magnetized reduced roasted iron-beneficiation tailings with the average particle size of 10-12 mu m, 0.2%-0.4% of an efficient water reducer, 42%-43% of a coarse aggregate, 28%-29% of a aggregates, and 6.5%-7.5% of water. The advantages comprises magnetized reduced roasted iron-beneficiation tailings are directly used to replace mineral slag powder or fly ash and are used as an concrete admixture to prepare C50-C60 grade concrete, so that the concrete finally obtains good workability and mechanical properties, the production cost of concrete is reduced, the environmental harm of magnetized reduced roasted iron-beneficiation tailings is reduced, and therefore the high-strength concrete possesses obvious economic benefit and social benefit.
Description
Technical field
The present invention relates to concrete field, particularly relate to the high-strength concrete that a kind of Magnetization reductive roasting iron selection tailings makees adulterant.
Background technology
Iron tailings has become the solid waste that the current quantum of output of China is maximum, comprehensive utilization ratio is lower.Compared with the solid waste such as flyash, coal gangue, iron tailings comprehensive utilization technique is more complicated, difficulty is larger.At present, China's industrial solid castoff overall utilization is about 60%, and the average utilization of iron tailings only has 14%, by contrast, and the large large time delay of comprehensive utilization of iron tailings.
Magnetization reductive roasting iron selection tailings is as a branch of iron tailings, and in its output at iron tailings and utilization ratio, proportion should not be underestimated.This iron tailings is obtained after thermal treatment, reduction and strong magnetic ore separation by weak magnetism mineral such as rhombohedral iron ore, limonite, spathic iron ore and mineral intergrowths (red ore deposit) thereof.The maximum feature of this mine tailing is that iron level is high and form changeable etc., and thus its comprehensive utilization ratio is far below the mean level (ML) of iron tailings.For this reason, how to make full use of the characteristic of Magnetization reductive roasting iron selection tailings, effectively improve its resource utilization rate, realize its turning waste into wealth at building material industry, become the focus that investigators pay close attention to.
At present, in concrete, the general solid waste of 20% ~ 50% that uses substitutes cement as adulterant, and the solid waste used mainly comprises slag, flyash etc.But along with sharply the rising of slag powders in recent years and flyash consumption, the rising steadily and the obvious decline of flyash quantity discharged of slag powders price, slag powders and flyash have presented as concrete admixture the trend that supply falls short of demand.If Magnetization reductive roasting iron selection tailings powder can be substituted flyash and slag to be used as concrete admixture, then not only can alleviate slag powders and the flyash present situation that supply falls short of demand, reduce concrete production cost, and the recycling problem of Magnetization reductive roasting iron selection tailings powder can be solved, reduce the environmental hazard brought by Magnetization reductive roasting iron selection tailings powder.
Having prepares in concrete about iron tailings as concrete admixture, patent of invention CN200710118711.9 discloses a kind of using magnetite quartzite sections mine tailing as concrete blended material technology, its mine tailing used is the Quartzite Type mine tailing through hydrothermal alteration reaction, different from the chemical constitution of the present invention's Magnetization reductive roasting used iron selection tailings.Patent of invention CN201410193087 discloses a kind of technology preparing high-strength concrete with iron tailings sand part replacement natural sand, and main raw used is iron tailings sand, but not iron tailings powder.Have patent of invention CN1616372A to disclose the technology of a kind of mine tailing as cement mixture, mine tailing used is the magnesia mine tailing of treated calcium.Patent of invention CN201210585500 and CN103011648 is had to disclose a kind of the reinforcement of concrete Modified Iron mine tailing active admixture, in such technology iron tailings used, dioxide-containing silica is greater than 50%, iron level is less than 12%, belong to quartzy class iron tailings, and this iron tailings must mix with flyash or slag powders and is used as concrete admixture simultaneously.
Summary of the invention
The object of this invention is to provide the high-strength concrete that a kind of Magnetization reductive roasting iron selection tailings makees adulterant, for the compositing characteristic of Magnetization reductive roasting iron selection tailings powder, provide one to utilize the completely alternative slag powders of Magnetization reductive roasting iron selection tailings powder and flyash to make adulterant and prepare concrete method.
For realizing above-mentioned purpose of the present invention, present invention employs following technical scheme:
According to chemical constitution, the particle size distribution analysis of iron tailings, using iron oxide content be 40 ~ 45% (wt%), dioxide-containing silica is 25 ~ 27% (wt%), alumina content is 9 ~ 10% (wt%), median size be the Magnetization reductive roasting iron selection tailings powder of 10 ~ 12 μm as concrete adulterant, the amount that described Magnetization reductive roasting iron selection tailings replaces cement is 20% ~ 40% (weight ratio).
High-strength concrete mass percent formula of the present invention is: cement 12% ~ 16%, Magnetization reductive roasting iron selection tailings powder 4% ~ 9%, high efficiency water reducing agent 0.2% ~ 0.4%, coarse aggregate 42% ~ 43%, fine aggregate 28% ~ 29%, water 6.5% ~ 7.5%.Described cement is ordinary Portland cement, 42.5 grades.Described Magnetization reductive roasting iron selection tailings powder, its median size is 10 ~ 12 μm, and iron oxide content is 40 ~ 45%, and dioxide-containing silica is 25 ~ 27%, and alumina content is 9 ~ 10%.Described high efficiency water reducing agent is poly carboxylic acid anti-subsided admixture, and solid content is 40%.Described coarse aggregate is rubble, and adopt continuous grading, particle diameter is respectively 5 ~ 10mm and 10 ~ 20mm, and ratio is 4:6.Described fine aggregate is river sand, medium sand, and fineness modulus is 2.8.
The Magnetization reductive roasting iron selection tailings powder that utilizes of the present invention prepares concrete method employing following steps as adulterant:
(1) chemical composition analysis, particle size distribution analysis are carried out to Magnetization reductive roasting iron selection tailings, ensure that the granularity of Magnetization reductive roasting iron selection tailings meets the requirement of 10 ~ 12 μm.
(2) according to GB/T50080-2002 " Standard for test methods of properties of ordinary concrete mixture standard ", the starting material such as Magnetization reductive roasting iron selection tailings, cement, fine aggregate, coarse aggregate, admixture, water are made concrete according to composition and ratio, note observing concrete mobility, cohesiveness, full water-based simultaneously, again by adjusting the consumption of water reducer and water, can ensure that the workability of Magnetization reductive roasting iron selection tailings meets the requirement of performance technical indicator.
(3) concrete mechanical property is measured.According to GB/T50081-2002 " standard for test methods of mechanical properties of ordinary concrete ", make concrete sample dimensions 150 × 150 × 150mm.After normal curing, measure the ultimate compression strength of its 3d, 7d and 28d respectively, ensure that concrete mechanical property meets the intensity index of C50 ~ C60 grade concrete.
The invention has the advantages that: the feature making full use of Magnetization reductive roasting iron selection tailings Powder Particle Size narrowly distributing, without the need under carrying out the condition of thermal activation or chemical activation to it, being directly used for alternative slag powders or flyash prepares the concrete of C50 ~ C60 grade as concrete admixture.Wherein, appropriate Magnetization reductive roasting iron selection tailings powder plays microstage and joins effect in concrete, can effectively improve concrete grating, reduce the harmful boring ratio example in concrete, make concrete mainly with the few harmful Kong Weizhu of 20 ~ 50nm, thus concrete finally obtains good workability and mechanical property.Compared with the concrete utilizing the adulterants such as ore slag fly ash of same label, the present invention is owing to make use of Magnetization reductive roasting iron selection tailings in a large number, thus reduce concrete production cost, decrease the environmental hazard of Magnetization reductive roasting iron selection tailings, thus there is obvious economic benefit and social benefit.
Embodiment
Embodiment 1
By weight percentage, concrete is raw materials used as follows in the present invention: the consumption of Magnetization reductive roasting iron selection tailings is 4%, and cement consumption is 16%, and polycarboxylate water-reducer consumption is 0.2%, and rubble consumption is 43%, and river sand consumption is 29%, and water consumption is 6.8%.According to concrete preparation method described above, and respectively slump and intensity test are carried out to obtained concrete.The slump of institute's concrete batching is 230mm, 3d ultimate compression strength be 39MPa, 7d ultimate compression strength be 54.3MPa, 28d ultimate compression strength is 65.3MPa.Reach the concrete strength grade requirement of C60.
Embodiment 2
By weight percentage, concrete is raw materials used as follows in the present invention: the consumption of Magnetization reductive roasting iron selection tailings is 5.2%, and cement consumption is 15.7%, polycarboxylate water-reducer consumption is 0.25%, rubble consumption is 43.3%, and river sand consumption is 28.95%, and water consumption is 6.8%.According to concrete preparation method described above, and respectively slump and intensity test are carried out to obtained concrete.The slump of institute's concrete batching is 230mm, 3d ultimate compression strength be 35MPa, 7d ultimate compression strength be 52.3MPa, 28d ultimate compression strength is 66.9MPa.Reach the strength grade requirement of C60 high-strength concrete.
Embodiment 3
By weight percentage, concrete is raw materials used as follows in the present invention: the consumption of Magnetization reductive roasting iron selection tailings is 6.3%, and cement consumption is 14.6%, polycarboxylate water-reducer consumption is 0.29%, rubble consumption is 43%, and river sand consumption is 28.51%, and water consumption is 7.3%.According to concrete preparation method described above, and respectively slump and intensity test are carried out to obtained concrete.The slump of institute's concrete batching is 230mm, 3d ultimate compression strength be 31MPa, 7d ultimate compression strength be 50.8MPa, 28d ultimate compression strength is 67.1MPa.Reach the strength grade requirement of C60 high-strength concrete.
Embodiment 4
By weight percentage, concrete is raw materials used as follows in the present invention: the consumption of Magnetization reductive roasting iron selection tailings is 7.3%, and cement consumption is 13.6%, polycarboxylate water-reducer consumption is 0.33%, rubble consumption is 43%, and river sand consumption is 28.77%, and water consumption is 7%.According to concrete preparation method described above, and respectively slump and intensity test are carried out to obtained concrete.The slump of institute's concrete batching is 230mm, 3d ultimate compression strength be 26.4MPa, 7d ultimate compression strength be 44.0MPa, 28d ultimate compression strength is 62.3MPa.Reach the strength grade requirement of C60 high-strength concrete.
Embodiment 5
By weight percentage, concrete is raw materials used as follows in the present invention: the consumption of Magnetization reductive roasting iron selection tailings is 8.4%, and cement consumption is 12.5%, polycarboxylate water-reducer consumption is 0.38%, rubble consumption is 43%, and river sand consumption is 28.42%, and water consumption is 7.3%.According to concrete preparation method described above, and respectively slump and intensity test are carried out to obtained concrete.The slump of institute's concrete batching is 230mm, 3d ultimate compression strength be 23.4MPa, 7d ultimate compression strength be 41.0MPa, 28d ultimate compression strength is 57.1MPa.Reach the strength grade requirement of C50 high-strength concrete.
Claims (1)
1. a Magnetization reductive roasting iron selection tailings does the high-strength concrete of adulterant, it is characterized in that: described high-strength concrete mass percent formula is: cement 12% ~ 16%, Magnetization reductive roasting iron selection tailings powder 4% ~ 9%, high efficiency water reducing agent 0.2% ~ 0.4%, coarse aggregate 42% ~ 43%, fine aggregate 28% ~ 29%, water 6.5% ~ 7.5%, wherein said cement is ordinary Portland cement, 42.5 grades, described Magnetization reductive roasting iron selection tailings powder median size is 10 ~ 12 μm, iron oxide content is 40 ~ 45%, dioxide-containing silica is 25 ~ 27%, alumina content is 9 ~ 10%, described high efficiency water reducing agent is poly carboxylic acid anti-subsided admixture, solid content is 40%, described coarse aggregate is rubble, adopt continuous grading, particle diameter is respectively 5 ~ 10mm and 10 ~ 20mm, ratio is 4:6, described fine aggregate is river sand, medium sand, fineness modulus is 2.8.
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| CN201410646201.9A CN104402335A (en) | 2014-11-14 | 2014-11-14 | High-strength concrete employing magnetized reduced roasted iron-beneficiation tailings as admixture |
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| CN201410646201.9A CN104402335A (en) | 2014-11-14 | 2014-11-14 | High-strength concrete employing magnetized reduced roasted iron-beneficiation tailings as admixture |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107058721A (en) * | 2017-05-15 | 2017-08-18 | 厦门清胜环保科技有限公司 | A kind of magnetizing roast Ultrafine Grinding iron tailings processing method and system for being used to replace wollastonite powder |
| CN107117844A (en) * | 2017-05-25 | 2017-09-01 | 中南冶金地质研究所 | A kind of method that utilization reduced iron tailings prepares cement concrete mineral admixture |
| CN107500657A (en) * | 2017-09-22 | 2017-12-22 | 大连地拓环境科技有限公司 | A kind of sleeper concrete of superfine suspension roasting iron tailings as mineral admixture |
| CN107739173A (en) * | 2017-09-22 | 2018-02-27 | 大连地拓环境科技有限公司 | A kind of superfine suspension roasting iron tailings prepares curb stone concrete as mineral admixture |
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| CN103011697A (en) * | 2011-09-20 | 2013-04-03 | 肖力光 | External thermal insulation polymer mortar produced by adopting iron tailings powder to replace fine quartz sand, and production method thereof |
| CN103342491A (en) * | 2013-07-10 | 2013-10-09 | 武汉理工大学 | Iron tailing-based complex mineral admixture and preparation process thereof |
| CN103833290A (en) * | 2014-03-26 | 2014-06-04 | 河北联合大学 | Baking-free brick prepared from foamed cement waste and preparation method for baking-free brick |
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Patent Citations (6)
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| WO2009085425A1 (en) * | 2007-12-20 | 2009-07-09 | Icrete Llc | Concrete compositions optimized for high workability |
| CN103011697A (en) * | 2011-09-20 | 2013-04-03 | 肖力光 | External thermal insulation polymer mortar produced by adopting iron tailings powder to replace fine quartz sand, and production method thereof |
| CN102417970A (en) * | 2011-11-15 | 2012-04-18 | 戴元宁 | Method for reducing, magnetizing and concentrating iron tailings |
| CN104119035A (en) * | 2013-04-28 | 2014-10-29 | 杨哲 | High-performance concrete and preparation method thereof |
| CN103342491A (en) * | 2013-07-10 | 2013-10-09 | 武汉理工大学 | Iron tailing-based complex mineral admixture and preparation process thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107058721A (en) * | 2017-05-15 | 2017-08-18 | 厦门清胜环保科技有限公司 | A kind of magnetizing roast Ultrafine Grinding iron tailings processing method and system for being used to replace wollastonite powder |
| CN107117844A (en) * | 2017-05-25 | 2017-09-01 | 中南冶金地质研究所 | A kind of method that utilization reduced iron tailings prepares cement concrete mineral admixture |
| CN107117844B (en) * | 2017-05-25 | 2019-09-10 | 中南冶金地质研究所 | A method of cement concrete mineral admixture is prepared using reduced iron tailings |
| CN107500657A (en) * | 2017-09-22 | 2017-12-22 | 大连地拓环境科技有限公司 | A kind of sleeper concrete of superfine suspension roasting iron tailings as mineral admixture |
| CN107739173A (en) * | 2017-09-22 | 2018-02-27 | 大连地拓环境科技有限公司 | A kind of superfine suspension roasting iron tailings prepares curb stone concrete as mineral admixture |
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Application publication date: 20150311 |