CN105000832A - Coal gangue concrete and preparing method thereof - Google Patents
Coal gangue concrete and preparing method thereof Download PDFInfo
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- CN105000832A CN105000832A CN201510330290.0A CN201510330290A CN105000832A CN 105000832 A CN105000832 A CN 105000832A CN 201510330290 A CN201510330290 A CN 201510330290A CN 105000832 A CN105000832 A CN 105000832A
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Abstract
The invention relates to a concrete product with coal gangue aggregates as main raw materials and a preparing method thereof, in particular to the method for preparing the concrete by calcining coal gangue manually, and belongs to the technical field of concrete materials, wherein the coal gangue is manually-calcined coal gangue, and the calcining temperature of the coal gangue ranges from 1100 DEG C to 1200 DEG C. The coal gangue is prepared by evenly mixing and stirring, by weight, 40%-50% of manually-calcined coal gangue, 15%-23% of cement, 25%-28% of medium sand and 5%-12% of water. According to the coal gangue concrete and the preparing method, the advantages of being high in cylinder compressive strength, light in weight, low in heat conductivity coefficient, capable of saving energy, free of radioactivity and the like of the coal gangue are utilized, waste is turned into wealth, and the produced concrete can be cast in situ, can be prefabricated and can be used for blending the coal gangue concrete of a high-strength structure; the process is simple, no new device needs to be built, and the self-ignition coal gangue can be calcined through an existing device; the coal gangue concrete and the preparing method thereof have remarkable economic and social benefits on the aspects of saving the land, saving the energy, utilizing the waste, protecting the environment and the like, accord with the national industrial policy and are easy to apply and popularize.
Description
Technical field
thisinvention relates to a kind of concrete using coal gangue as main raw material and preparation method thereof, belongs to concrete material technical field.
Background technology
China is coal big country, about 4,500,000,000 tons are stored up with the coal gangue of its association is accumulative, land occupation 1,150,000 hectares, and the annual also new coal gangue producing more than one hundred million tons, Piling of Gangue is as mountain, and about there is more than 1600 coal gangue in the whole nation, not only takies a large amount of soils, also atmosphere pollution and water quality is extremely serious to the harm of the mankind.Along with the quickening of Urbanization Process In China; significantly increase material of construction demand, country is in order to protect land resources, stop disorderly to adopt, disorderly dig, the surrounding enviroment of protection air and water quality; process Piling of Gangue, changing waste into valuables has become the research and production mode reform of being engaged in building material product manufacturing concern.
Traditional concrete uses common rubble as addition material usually, and the tap density of common rubble is at 1400kg/m
3left and right, concrete unit weight reaches 2400kg/m
3left and right, quite ripe through this technology of use for many years.But along with the increase of China's building amount, rubble resource is significantly reducing year by year, and due to its concrete density large, the deadweight of buildings is also along with increase, and the quantity of material of construction reinforcing bar used also increases, and in order to strengthen housing quality, cost will remain high; The leca concrete developed subsequently also uses on a large scale in China, this kind of burning of clay haydite, and the coagulation penus lightweight aggregate concrete made, it is functional, light weight.But it is very serious to damage the phenomenon of ploughing, by national policy is limited.Above-mentioned concrete has not met the policy of the existing energy-saving and emission-reduction of China at present, namely destroys limited land resources, is unfavorable for energy-conserving and environment-protective yet.
Summary of the invention
In order to protection of the environment, solve the problem of complex utilization of coal gangue, the object of the present invention is to provide one to utilize coal gangue to produce concrete preparation method as aggregate.
The present invention adopts following technical scheme: a kind of coal gangue concrete, is characterized in that: coal gangue used is artificial calcining coal gangue, and its calcining temperature is 1100 DEG C-1200 DEG C.
Above-mentioned concrete component is: artificial calcining coal gangue 40-50%, cement 15-23%, medium sand 25 ~ 28% form with water 5-12% mixed preparing.
The particle diameter of above-mentioned artificial calcining coal gangue is 5-31.5mm, and tap density is 900-1200kg/m
3, cylindrical compress strength>=7MPa, water-intake rate is 8-15%, and coefficient of softening is less than 0.8.
Another object of the present invention is to provide a kind of preparation method of coal gangue concrete, and concrete steps are as follows:
1., coal gangue preparation and calcining; Self-igniting coal gangue is broken through jaw crusher, and after bolting, getting particle size diameter is that the aggregate of 5-31.5mm is stand-by;
2., the processing of coal dust spike; Lump coal is levigate through ball mill, and fineness is that the coal dust of 0.3 ~ 1mm is stand-by;
3., by step coal gangue aggregate 1. send into rotary kiln drying cylinder inner drying to water ratio close to zero, then enter calcined by rotary kiln, step coal dust 2. sprays into from this rotary kiln afterbody, the countercurrent flow of hot and described coal gangue aggregate; Its calcining temperature is 1100 DEG C-1200 DEG C, and calcination time is 40-60 minute, makes artificial calcining coal gangue;
4., calcining after coal gangue again sieve through vibratory screening apparatus, be sieved into the coarse aggregate of several different grain size category of 5mm to 31.5mm, its vibrating transportation speed is 0.1m/s, and the coal gangue after making it calcine is cooled to 50 DEG C gradually, and its cooling time is 20 ~ 30 minutes;
5., by step 4. add water after mixing and stirring with cement, medium sand, the coal gangue concrete made; This concrete proportioning is: artificial calcining coal gangue 40-50%, cement 15-23%, medium sand 25 ~ 28%, water 5-12%.
The above-mentioned artificial calcining coal gangue concrete-agitating time is no less than 3 minutes, and the slump is 20-60mm.
Above-mentioned artificial calcining coal gangue also needed water spray to prewet before step 5. concrete batching, its prewet after water ratio be 8 ~ 10%.
The present invention's the 3rd object, is to provide a kind of artificial concrete goods of calcining coal gangue, comprises in artificial calcining coal gangue concrete and adds the artificial calcining coal gangue Steel Concrete of reinforcing bar preparation for house cast; With with the shaping pavior brick of artificial calcining coal gangue, lawn brick, revetment brick and coal gangue concrete building block etc.
The intensity of the coal gangue concrete of the present invention's preparation meets LC15, the strength grade of LC20, LC25, LC30, LC35, LC40, meets the requirement of JGJ12-2006 " lightweight aggregate concrete structure technology code ".
Adopt technical scheme of the present invention, its beneficial effect is as follows: 1) coal shale in brick making aboundresources, the coal gangue after artificial calcining, and cylindrical compress strength is high, lightweight, thermal conductivity are low, energy-conservation and "dead"; That one turns waste into wealth, the green construction material of renewable resource, this concrete can cast-in-place, can be prefabricated; can be used to preparation high-strength structure coal gangue concrete products; replace common rubble and clay with artificial calcining coal gangue, save soil, very favourable to protectorate's soil resource.2) industrial residue being utilized in a large number, alleviate the impact of bastard coal mountain on environment, economize on resources, reducing the destruction to ploughing.3) coal gangue of artificial calcining belongs to light skeletal category, add-on can higher than the add-on of self-igniting coal gangue, the concrete strength be mixed with, dry capacity and water-intake rate all exceed the concrete adding self-igniting coal gangue and be mixed with, the deadweight of buildings can be alleviated, improve the intensity of concrete placement part, reduce its construction costs.4) technique is simple, need not newly-built equipment, existing installation can be utilized to calcine self-igniting coal gangue, be easy to promotion and implementation.5) concrete become by calcining coal gangue mixture meets the industry standard of JGJ12-2006 " lightweight aggregate concrete structure technology code ".It is an important channel of coal gangue comprehensive utilization.The present invention not only has huge economic benefit, and saving land, energy-conservation, profit is useless and have significant social benefit in environment protection etc., meets national industrial policies.
Embodiment
Technical scheme of the present invention is: prepare coal gangue concrete with artificial calcining coal gangue, and wherein, the calcining temperature of artificial calcining coal gangue is 1100 DEG C-1200 DEG C.The proportioning raw materials of this coal gangue concrete is (weight percent): artificial calcining coal gangue 40-50%, cement 15-23%, medium sand 25 ~ 28% form with water 5-12% mixed preparing.
Wherein, artificial calcining coal gangue used, particle diameter is 5-31.5mm, and tap density is 900-1200kg/m
3, cylindrical compress strength>=7MPa, water-intake rate is 8-15%, and coefficient of softening is less than 0.8.
The concrete compound method of above-mentioned artificial calcining coal gangue, concrete operation step is as follows:
1., the preparation of coal gangue coarse aggregate and calcining; Self-igniting coal gangue shovel loader is transported into jaw crusher hopper, after jaw crusher fragmentation, enters chapelet, transport to the vibratory screening apparatus be located on feed bin, sifted out by fines, coarse fodder flows into kiln hood storehouse intermediate storage.Particle size diameter after above-mentioned coal gangue fragmentation is 5-31.5mm.
2., the processing of coal dust spike; Lump coal dump truck is transported into, and is stored in coal-hole.With shovel loader, coal is transported to lift charging opening from coal-hole.The charging feed bin of ball mill is transported to by bucket elevator coal.Electro-vibrating feeder divided into by feed bin, and it is levigate that coal evenly enters ball mill by electro-vibrating feeder, and it is for subsequent use that fineness is that the coal dust of 0.3 ~ 1mm sends into coal dust storehouse by chapelet and worm conveyor.
3., calcined coal gangue; Coal gangue fragment after step 1. fragmentation is measured feeding machine by the belt under kiln hood storehouse evenly flow out, enter the drying cylinder of Dual-barrel rotary kiln; The flue gas drying of coal gangue in rotary kiln to water ratio close to zero, then enter kiln calcining, the coal dust after 2. step processes sprays into from kiln tail, the heat of coal dust firing and this self-igniting coal gangue countercurrent flow, calcining temperature is 1100 DEG C-1200 DEG C, and calcination time is 40-60 minute.
4. the coal gangue, after calcining reenters inertia vibrating screen through mechanical oscillating conveyor feeding chapelet and sieves, be sieved into the coarse aggregate of several different grain size grades in 5mm to 31.5mm scope, mechanical oscillating conveyor transfer rate is very slow, only has 0.1m/s, so that the high-temperature coal spoil after calcining is cooled to 50 DEG C gradually, destroy in case acute cold string stress produces its concrete structure.Thick block sieve being greater than 40mm enters roll crushing crusher machine, and the particle through fragmentation reenters bolting.
5., 4. step is processed after artificial calcining coal gangue and after cement, medium sand add water and be mixed in proportion and stir, the artificial calcining coal gangue concrete made; The proportioning of artificial calcining coal gangue concrete mixture is: artificial calcining coal gangue 40-50%, cement 15-23%, medium sand 25 ~ 28% and water 5-12%.
Above-mentioned artificial calcining coal gangue coarse aggregate concrete churning time is not less than 3 minutes, and Best Times is 3 ~ 4 minutes, and the slump is 20-60mm.
Above-mentioned artificial calcining coal gangue also needed to prewet to this calcining coal gangue before step 5. concrete batching, can adopt spray mode, and the water ratio of the artificial calcining coal gangue after water spray is 8 ~ 10%.
The present invention is the concrete goods of the artificial calcining coal gangue of claimed one also, are included in artificial calcining coal gangue concrete and add the artificial calcining coal gangue Steel Concrete of reinforcing bar preparation for house cast.Comprise and prepare the products such as pavior brick, lawn brick, revetment brick, coal gangue concrete building block with artificial calcining coal gangue concrete.
The intensity of the coal gangue concrete of the present invention's preparation meets LC15, the strength grade of LC20, LC25, LC30, LC35, LC40.
Below by way of concrete preparation example, the present invention is described in further detail:
Example 1:
With the coal gangue concrete LC10 that the coal gangue of artificial calcining is coarse aggregate preparation, the proportioning of every its compound of cubic meter of concrete is: after artificial calcining coal gangue 50%, 32.5 cement 15%, medium sand 27%, water 8% mix, prepared by Site, after maintenance in 28 days, mean compressive strength is 12.5MPa.
Wherein, select the artificial calcining coal gangue coarse aggregate of grating, its size range is 5 ~ 31.5mm, and the grain composition of coarse aggregate meets the regulation of GB/T17431.1-1998 national standard.
The concrete water cement ratio of above-mentioned artificial calcining coal gangue: W/C=0.60.
Prepared by Site by the artificial calcining concrete of above-mentioned raw materials proportioning, after maintenance in 28 days, mean compressive strength is 12.5MPa.
Example 2:
With the coal gangue concrete LC20 that the coal gangue of artificial calcining is coarse aggregate preparation, the proportioning of every its compound of cubic meter of concrete is: artificial calcining coal gangue 45%, 32.5 cement 17%, medium sand 28%, water 10%, the pH value=7-8 of water.
Wherein, select the artificial calcining coal gangue coarse aggregate of grating, its size range is 5 ~ 31.5mm, and the grain composition of coarse aggregate meets the regulation of GB/T17431.1-1998 national standard.
The concrete water cement ratio of above-mentioned artificial calcining coal gangue: W/C=0.53; Prepared by Site, after maintenance in 28 days, mean compressive strength is 22.7MPa.
Embodiment 3:
With the coal gangue concrete LC30 that the coal gangue of artificial calcining is coarse aggregate preparation, the proportioning of every its compound of cubic meter of concrete is: artificial calcining coal gangue 43%, 42.5 cement 22%, medium sand 26%, water: 9%; PH value=7 of water;
Wherein, select the artificial calcining coal gangue coarse aggregate of grating, its size range is 5 ~ 31.5mm, and the grain composition of coarse aggregate meets the regulation of GB/T17431.1-1998 national standard.
The concrete water cement ratio of above-mentioned artificial calcining coal gangue: W/C=0.41; Through stirring extemporaneous preparation maintenance in 28 days, mean compressive strength is 33.2MPa.
Example 4:
With the coal gangue concrete LC40 that the coal gangue of artificial calcining is coarse aggregate preparation, the proportioning of every its compound of cubic meter of concrete is: artificial calcining coal gangue 40%, 42.5 cement 23%, medium sand 25%, water 12%; PH value=7 of water;
Wherein, select the artificial calcining coal gangue coarse aggregate of grating, its size range is 5 ~ 31.5mm, and the grain composition of coarse aggregate meets the regulation of GB/T17431.1 national standard.
The concrete water cement ratio of above-mentioned artificial calcining coal gangue: W/C=0.49;
Through stirring extemporaneous preparation maintenance in 28 days, mean compressive strength is 43.8MPa.
Example 5:
With the concrete road pavement brick that the coal gangue of artificial calcining is coarse aggregate preparation, grade of compressive strength is CC30; The proportioning of every cubic meter of concrete is: artificial calcining coal gangue coarse aggregate 45%, 42.5 cement 22%, medium sand 28%, water 5%;
Wherein, select the artificial calcining coal gangue coarse aggregate of grating, its size range is 5 ~ 31.5mm, and the grain composition of coarse aggregate meets the regulation of GB/T17431.1 national standard.
After above-mentioned raw materials mixing, through stirring compression molding; Then maintenance 8 hours at the temperature of 40-50 DEG C, its mean compressive strength is 25Mpa, the minimum compression strength value of monolithic is 21Mpa, the outer natural curing of holding chamber 28 days again, mean compressive strength value is 32Mpa, the minimum ultimate compression strength of monolithic is 26Mpa, meets People's Republic of China (PRC) building material industry standard JC/T446-2000 " concrete road pavement brick standard ".
Example 6:
With the concrete hollow block that the coal gangue of artificial calcining is coarse aggregate preparation, grade of compressive strength is 5 grades; The proportioning of every cubic meter of concrete is: artificial calcining coal gangue coarse aggregate 47%, flyash 5%, artificial calcining coal gangue fine aggregate 0-28%, P.0 42.5 cement 20%, water 5%; Wherein, the artificial calcining coal gangue of grating selected by coarse aggregate, and its size range is 5 ~ 31.5mm, and the grain composition of coarse aggregate meets the regulation of GB/T17431.1 national standard; Fine aggregate meets the regulation of GB/T17431.1 national standard.Flyash should meet the standard regulation of JGJ28, GB/T1596.
The concrete water cement ratio of above-mentioned artificial calcining coal gangue: W/C=0.20; Frost-resistance grade >F25;
The dry apparent density of building block is 1380kg/m
3;
After above-mentioned raw materials mixing, through stirring compression molding; The outer natural curing of holding chamber is after 28 days, and ultimate compression strength mean value is 6.3Mpa, and ultimate compression strength monolithic is minimum is 4.7Mpa, meets People's Republic of China (PRC) GB/T15229-2002 " lightweight small size hollow concrete blocks " standard.
With the concrete road pavement brick that artificial calcining coal gangue is processed into, not only intensity is high, and has good water-permeable, wear resistance, frost resistance and long-lived feature.
The concrete that above-mentioned example 1-4 prepares, its technical performance index is as following table:
Technical performance index
Utilize the coal gangue of artificial calcining can produce the strength grade of lightweight aggregate concrete for LC10, LC15, LC20, LC25, LC30, LC35, the design grades such as LC40, meet the industry standard of JGJ12-2006 " lightweight aggregate concrete structure technology code ", may be used for making the components such as concrete whole floor, balcony slab, bench beam, trench plate, also can be used for the beam of cast building construction, plate, post and concrete road pavement brick, lawn brick, revetment brick, concrete segment etc.
Claims (9)
1. a coal gangue concrete, it is characterized in that: it is by artificial calcining coal gangue, cement, medium sand and water mixing and stirring are formulated, and its proportioning raw materials is (accounting for weight percent): artificial calcining coal gangue 40-50%, cement 15-23%, medium sand 25 ~ 28% and water 5-12%; The calcining temperature of described artificial calcining coal gangue is 1100 DEG C-1200 DEG C.
2. coal gangue concrete according to claim 1, is characterized in that: the particle diameter of described artificial calcining coal gangue is 5-31.5mm, and tap density is 900-1200kg/m
3, cylindrical compress strength>=7MPa, water-intake rate is 8-15%, and coefficient of softening is less than 0.8.
3. a preparation method for coal gangue concrete described in claim 1, is characterized in that: concrete steps are as follows:
1., coal gangue preparation and calcining; Self-igniting coal gangue is broken through jaw crusher, and after bolting, getting particle size diameter is that the aggregate of 5-31.5mm is stand-by;
2., the processing of coal dust spike; Lump coal is levigate through ball mill, and its fineness is that the coal dust of 0.3 ~ 1mm is stand-by;
3., step coal gangue aggregate is 1. sent into rotary kiln drying cylinder inner drying to water ratio close to zero, then dried coal gangue aggregate is dropped into calcined by rotary kiln, step coal dust is 2. sprayed into by the kiln tail of this rotary kiln, the heat of coal dust firing and the countercurrent flow of described coal gangue aggregate; Described calcining temperature is 1100 DEG C-1200 DEG C, and calcination time is 40-60 minute;
4. the coal gangue, after calcining sieves again through vibratory screening apparatus, the aggregate screening of particle diameter within the scope of 5-3.5mm is become the coarse aggregate of different grades, its vibrating transportation speed is 0.1m/s, and make the coal gangue after calcining be cooled to 50 DEG C gradually, cooling time is 20 ~ 30 minutes;
5., the coarse aggregate 4. cooled through step is mixed with cement, medium sand and water, shared by each composition, weight percent is: after artificial calcining coal gangue 40-50%, cement 15-23%, medium sand 25 ~ 28% mix with water 5-12%, and dropping in stirrer stirs makes artificial calcining coal gangue concrete.
4. preparation method according to claim 3, is characterized in that: the tap density of step 4. described artificial calcining coal gangue coarse aggregate is 900-1200kg/m
3, cylindrical compress strength>=7MPa, water-intake rate is 8-15%, and coefficient of softening is less than 0.8.
5. preparation method according to claim 4, is characterized in that: described artificial calcining coal gangue coarse aggregate also needed water spray to prewet before 5. step prepares described concrete, and the water ratio of this artificial calcining coal gangue coarse aggregate is 8 ~ 10%.
6. the preparation method according to claim 3 or 4 or 5, is characterized in that: the step 5. concrete churning time of described artificial calcining coal gangue is no less than 3 minutes, and the slump is 20-60mm.
7. according to any one of claim 3-6 preparation method, it is characterized in that: the intensity of described coal gangue concrete meets LC15, the strength grade of LC20, LC25, LC30, LC35, LC40.
8. the concrete goods of artificial calcining coal gangue described in any one of claim 1-7, is characterized in that: in described artificial calcining coal gangue concrete, add the artificial calcining coal gangue Steel Concrete of reinforcing bar preparation for house cast.
9. the concrete goods of artificial calcining coal gangue described in any one of claim 1-7, comprise the pavior brick with artificial calcining coal gangue concrete formation, lawn brick, revetment brick, coal gangue concrete building block.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107500598A (en) * | 2017-06-28 | 2017-12-22 | 无锡市京锡冶金液压机电有限公司 | A kind of filler and its detection means applied to fire-proof board |
| CN109053062A (en) * | 2018-10-19 | 2018-12-21 | 沈阳建筑大学 | A kind of coal gangue concrete and the preparation method and application thereof |
| CN110054500A (en) * | 2019-03-11 | 2019-07-26 | 南京思宇环保科技有限公司 | A method of environmental protection brick is prepared using steel-making waste residue |
| CN113266099A (en) * | 2021-05-24 | 2021-08-17 | 济南东铁轨道交通建材有限公司 | Modified concrete and large-span floor slab |
| CN113292276A (en) * | 2021-05-12 | 2021-08-24 | 利辛县汝集镇南阳墙体材料有限公司 | Environment-friendly gangue brick processing method |
| CN114101280A (en) * | 2021-10-12 | 2022-03-01 | 航天凯天环保科技股份有限公司 | Coal gangue cascade utilization system and method |
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2015
- 2015-06-16 CN CN201510330290.0A patent/CN105000832A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107500598A (en) * | 2017-06-28 | 2017-12-22 | 无锡市京锡冶金液压机电有限公司 | A kind of filler and its detection means applied to fire-proof board |
| CN109053062A (en) * | 2018-10-19 | 2018-12-21 | 沈阳建筑大学 | A kind of coal gangue concrete and the preparation method and application thereof |
| CN110054500A (en) * | 2019-03-11 | 2019-07-26 | 南京思宇环保科技有限公司 | A method of environmental protection brick is prepared using steel-making waste residue |
| CN113292276A (en) * | 2021-05-12 | 2021-08-24 | 利辛县汝集镇南阳墙体材料有限公司 | Environment-friendly gangue brick processing method |
| CN113266099A (en) * | 2021-05-24 | 2021-08-17 | 济南东铁轨道交通建材有限公司 | Modified concrete and large-span floor slab |
| CN114101280A (en) * | 2021-10-12 | 2022-03-01 | 航天凯天环保科技股份有限公司 | Coal gangue cascade utilization system and method |
| CN114101280B (en) * | 2021-10-12 | 2023-09-12 | 航天凯天环保科技股份有限公司 | Gangue cascade utilization system and method |
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