CN105622013A - Method for preparing high-performance concrete by using gangue as main raw material - Google Patents

Method for preparing high-performance concrete by using gangue as main raw material Download PDF

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CN105622013A
CN105622013A CN201510988421.4A CN201510988421A CN105622013A CN 105622013 A CN105622013 A CN 105622013A CN 201510988421 A CN201510988421 A CN 201510988421A CN 105622013 A CN105622013 A CN 105622013A
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gangue
consumption
concrete
performance concrete
preparing
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CN105622013B (en
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秦丙克
籍永华
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Liupanshui Normal University
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Liupanshui Normal University
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/04Portland cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/30Water reducers, plasticisers, air-entrainers, flow improvers
    • C04B2103/302Water reducers
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

The invention discloses a method for preparing high-performance concrete by using gangue as a main raw material. Gangue is broken and sorted in a self-medium tubular breaker, and brittle powdery gangue and blocky gangue which has the large hardness and is not likely to be broken are obtained; the blocky gangue is broken again to obtain a material with the continuous particle size being 10-60 mm, and then the material is washed and dried to be used for drying coarse aggregate; sediments obtained in the washing process are dried, preheated together with the powdery gangue and calcined under the temperature of 400-650 DEG C, and an alkali-activator is added into the calcined product for tube milling together to form fine powder to be used as an admixture; then, the gangue admixture, ordinary potland cement, water, polycarboxylate-type superplasticizer, coal ash and the like are matched to form a binding material, finally, the binding material, the gravel fine aggregates and gangue coarse aggregates are proportionally and uniformly mixed and stirred, and the final high-performance concrete is obtained. The high-performance concrete has the advantages of being good in fluidity, free of segregation, good in mechanical property, good in durability and the like, the consumption of gangue in the technology is huge, and environmental pollution caused by gangue is effectively lowered.

Description

A kind of method preparing high performance concrete for primary raw material with gangue
Technical field
The invention belongs to technical field of concrete preparation, particularly to a kind of method preparing high performance concrete for primary raw material with gangue.
Background technology
Gangue, as a kind of industrial solid castoff, stacks the many hillocks of formation in a large number along with coal mining, causes taking storage area, heavy metal pollution river, produces air and dust pollution during spontaneous combustion. Solving spoil pollution and have number of ways perhaps after deliberation, one of them is manufacturing cement by using gangue admixture and prepares concrete. Current manufacturing cement by using gangue admixture or prepare concrete, generally by high-temperature calcination, or adds activator by the method for chemistry, causes production cost high and secondary pollution. Therefore, many experimental stages that rest on, the efficient industrial applications of gangue high-volume was not yet once reported. At present, large batch of solution coal gangue pollution, but without finding a feasible industrial technology route, its major reason is gangue chemical composition, physical arrangement complexity, and have many particulate poor quality coal dusts to be attached on gangue, the therefore more difficult popularization of gangue industrialized utilization.
Summary of the invention
For the shortcoming overcoming above-mentioned prior art, it is an object of the invention to provide a kind of method preparing high performance concrete for primary raw material with gangue, the present situation developed in conjunction with gangue and the physicochemical properties of gangue self, with gangue for main raw material(s), with Portland cement and coarse-fine aggregate for adjuvant, prepare the high performance concrete reaching C30��C40, it is achieved that the high-volume of Coal Gangue Resource utilizes.
To achieve these goals, the technical solution used in the present invention is:
A kind of method preparing high performance concrete for primary raw material with gangue, comprises the following steps:
First, gangue is carried out preliminary crushing and screening, obtain frangible powdery gangue and the non-friable greatly lumped coal spoil of hardness;
Secondly, described lumped coal spoil being broken for the continuous size fraction material of 10��60mm again, then washing and drying is standby as coarse aggregate;
, the precipitate obtained being dried in water-washing process, after preheating together with powdery gangue, at the temperature lower calcination of 400 DEG C��650 DEG C, the product after calcining adds the appropriate common pipe of alkali-activator and wears into fine powder as admixture meanwhile;
Finally, the Binder Materials that admixture, Portland cement, water, polycarboxylic acid series high efficiency water reducing agent, flyash etc. are made, press proportioning with sandstone fine aggregate and described coarse aggregate, uniformly mix and namely obtain final high performance concrete.
Described gangue is carrying out crushing and screening in Jie's tubulose disintegrating machine.
Described include tilting pipe mill cylinder 2 from Jie's tubulose disintegrating machine, the feed opening of the undertaking loading hopper 1 suitable for reading of pipe mill cylinder 2, the end opening of pipe mill cylinder 2 connects with it with the tilting rotary screen 4 of angle, rotary screen 4 is outside equipped with sorting cover 3, the barrel dliameter of described rotary screen 4 grinds the barrel dliameter of cylinder 2 less than pipe, pipe mill cylinder 2 barrel dliameter 1800-3600mm, tube length 4000-5500mm; The barrel dliameter 1600-3200mm of rotary screen 4, tube length 1500-3000mm, the angle of described pipe mill cylinder 2 and horizontal direction is 3-5 degree, and the range of speeds: 10-18r/min sorts granularity: 0.05-100mm, the aperture of rotary screen 4: 0.05-30mm.
Described alkali-activator is NaAlO2��Na2SiO3Or NaOH.
Described admixture, Portland cement, water, polycarboxylic acid series high efficiency water reducing agent, flyash constitute Binder Materials, sandstone fine aggregate consumption is the 25%��35% of concrete cumulative volume, coarse aggregate consumption is the 35%��50% of concrete cumulative volume, and gel material content is the 25%��40% of concrete cumulative volume.
Described gel material content is the 40% of concrete cumulative volume, and sandstone fine aggregate consumption is the 35% of concrete cumulative volume, and coarse aggregate consumption is the 25% of concrete cumulative volume; Described gel material content is the 25% of concrete cumulative volume, and sandstone fine aggregate consumption is the 25% of concrete cumulative volume, and coarse aggregate consumption is the 50% of concrete cumulative volume.
Described alkali-activator consumption is the 1wt%��12wt% of Portland cement consumption, in Binder Materials, admixture consumption is the 80wt%��130wt% of Portland cement consumption, poly carboxylic acid series water reducer consumption is the 0.1wt%��1.5wt% of Portland cement consumption, flyash consumption is the 3wt%��25wt% of Portland cement consumption, and water consumption is the 45wt%��75wt% of Portland cement consumption.
Described coarse aggregate and sandstone fine aggregate carry out continuous size fraction grating, and flat-elongated particles thing content is not more than 3%��9%, and clay content is not more than 2%, and clod content is not more than 0.3%��0.5%.
Described gangue is the gangue in six dish water areas, demarcates its mineral average chemical composition through XRF measuring and calculating with the weight/mass percentage composition of oxide, for: the SiO of 46.82%2, the CaO of 1.01%, the MgO of 1.86%, the Al of 19.362O3, the Fe of 12.34%2O3, the K of 1.09%2O, the MnO of 0.11%, the TiO of 5.71%2, the loss on ignition of 11.67% and the impurity of surplus, loss on ignition is incubated calculating in 3 hours at 600 DEG C.
Compared with prior art, the invention has the beneficial effects as follows:
1. the high performance concrete that the present invention is main raw material(s) with gangue, has the features such as good, the good endurance of mechanical property.
2. the high performance concrete that prepared by the present invention, there is good fluidity, do not isolate, etc. advantage.
3. to prepare technology of high performance concrete technics comparing perfect for the present invention, and operability is simple and easy to control, it is easy to large-scale promotion.
4. the technology of the present invention technical process, waste heat can recycle, and is conducive to energy-saving and emission-reduction, improves production efficiency.
5. the present invention can large batch of digestion gangue, it is possible to effectively reduce the gangue pollution to environment.
6. the present invention prepares high performance concrete and is widely used, and can save the resource product such as cement and sandstone in a large number, be conducive to preserving the ecological environment.
Accompanying drawing explanation
Fig. 1 is present invention process schematic flow sheet.
Fig. 2 is that the present invention is used from the structural representation of medium tubulose disintegrating machine.
Detailed description of the invention
Embodiments of the present invention are described in detail below in conjunction with drawings and Examples.
Embodiment 1
Adopting the P.C32.5 cement that six Pan Shuihaolong Cement Co., Ltds produce, every quality index all meets the physical property of every regulation of GB175-1999. Adopting gangue to produce coarse aggregate and admixture, gangue is the gangue in six dish water areas, and its mineral chemistry forms, and demarcates as shown in table 1 with the weight/mass percentage composition of oxide. It is mainly composed of SiO2��Al2O3With the oxide of Fe, basic anhydride content is below 5%.
The former spoil composition (%) of table 1
Title SiO2 CaO MgO Al2O3 Fe2O3 K2O MnO TiO2 LOI
Percentage composition 46.82 1.01 1.86 19.36 12.34 1.09 0.11 5.71 11.67
Preparation process is as shown in Figure 1:
First raw coal spoil is being carried out crushing and screening in Jie's tubulose disintegrating machine. From Jie's tubulose disintegrating machine, its principle is the mechanical attribute according to gangue self, reaches the effect of partial crushing in the process that pipe rotates. Namely according to gangue mechanical property difference, the component that hardness is little, easy to crack, the component of cracking big by hardness, difficult breaks, and then is sorted out.
Sort out and obtain two kinds of products, the gangue that namely frangible powdery gangue is big with block hardness. The lumped coal spoil that hardness is big, through the continuous size fraction material that crusher in crushing is 10��60mm, then washing and drying is standby as coarse aggregate. After water washing and precipitating thing is dried, and frangible powdery gangue, at the temperature lower calcination of 400 DEG C��650 DEG C after preheating. Product after calcining and a certain proportion of alkali-activator, common pipe wears into fine powder as admixture.
Alkali-activator is sodium metaaluminate. Coarse aggregate continuous size fraction 1��5mm, the modulus of fineness Mx=5.0 of coarse aggregate, elongated particles less than 7%, clay content��1%. Fine aggregate adopts the grail in six dish water areas, its modulus of fineness Mx=2.0, clay content��1.5%. What water reducer adopted is DC-WR2 type high performance water reducing agent of polyocarboxy acid. Flyash is the flyash of six Pan Shuixin Coal Chemical Industry power plant, and its specific surface area is 303g/cm2, apparent density is 2.0g/cm2, moisture content 0.17%. Hydromining tap water, places 24 hours, and its pH value is about 7.
With use the amount of cement as standard reference, in Binder Materials, to account for the ratio of cement respectively as follows for other composition: Coal-gangue Admixture is the 100wt% of cement, alkali-activator NaAlO2For the 3wt% of cement, poly carboxylic acid series water reducer is the 0.9wt% of cement, and flyash is the 15wt% of cement, water 55wt%, and water-cement ratio is 0.521. With volume of concrete total amount for standard, gangue coarse aggregate accounts for 40%, sandstone fine aggregate 25%, and joined Binder Materials accounting example is 35%.
Raw material precise, wherein the measurement deviation of cement, water reducer and water is �� 1.5%, and coarse-fine aggregate measurement deviation is �� 3.0%, carries out blanking stirring in strict accordance with match ratio. Stirring is first poured admixture, cement, water, flyash and water reducer into and is stirred no less than 10min in blender, is subsequently poured into coarse-fine aggregate and is stirred for 25min. Then in-molded in 100 �� 100 �� 100 standard examinations, put into standard curing box maintenance afterwards. 3 days average intensity value of test sample product are 26.3MPa after tested, and 28 days average intensity value are 34.6MPa.
Used by the present invention from medium tubulose disintegrating machine, be a kind of sizing machine for gangue based on strength difference, its structural representation is as shown in Figure 2. Including tilting pipe mill cylinder 2, the feed opening of the undertaking loading hopper 1 suitable for reading of pipe mill cylinder 2, the end opening of pipe mill cylinder 2 connects with it with the tilting rotary screen 4 of angle, and rotary screen 4 is outside equipped with sorting cover 3. The barrel dliameter of rotary screen 4 grinds the barrel dliameter of cylinder 2 less than pipe. Pipe mill cylinder 2 barrel dliameter 1800-3600mm, tube length 4000-5500mm; The barrel dliameter 1600-3200mm of rotary screen 4, tube length 1500-3000mm. The angle of pipe mill cylinder (2) and horizontal direction is 3-5 degree. Drum rotation speed scope: 10-18r/min. Sorting granularity: 0.05-100mm. The aperture of sieve: 0.05-30mm, rotary screen 4 can arrange single aperture screen drum or segmentation aperture screen drum as required, when arranging segmentation screen drum, designs external diameter with screen drum always between two sections, and the barrier ring of internal diameter 50-200mm less of screen drum, to improve screening efficiency.
Being that the gangue of certain particle size initially enters loading hopper 1 from medium tubulose disintegrating machine operation principle, in loading hopper 1, gangue is entered the helix drum being made up of pipe mill cylinder 2 and rotary screen 4 by action of gravity. Pipe mill cylinder 2 rotates, and material can be driven to fall at the peak close to cylinder, thus producing pipe mill effect in process. Do not have other abrasive material, the granule of Coal Gangue Structure intensity high abrasion to serve as abrasive material owing to pipe grinds in cylinder 2, and the low granule granularity under pipe mill effect of structural strength can become more tiny.
Embodiment 2
Adopting the P.C32.5 cement that six Pan Shuihaolong Cement Co., Ltds produce, every quality index all meets the physical property of every regulation of GB175-1999. Adopting gangue to produce coarse aggregate and admixture, process is consistent with embodiment 1.
Alkali-activator is sodium silicate. Coarse aggregate continuous size fraction 1��6mm, the modulus of fineness Mx=5.0 of coarse aggregate, elongated particles less than 5%, clay content��1%. Fine aggregate adopts the grail in six dish water areas, its modulus of fineness Mx=2.0, clay content��1.5%. What water reducer adopted is DC-WR2 type high performance water reducing agent of polyocarboxy acid. Flyash is the flyash of six Pan Shuixin Coal Chemical Industry power plant, and its specific surface area is 303g/cm2, apparent density is 2.0g/cm2, moisture content 0.17%. Hydromining tap water, places 24 hours, and its pH value is about 7.
With use the amount of cement as standard reference, in Binder Materials material, to account for the ratio of cement respectively as follows for other composition: Coal-gangue Admixture is the 90wt% of cement, alkali-activator Na2SiO3For the 2.5wt% of cement, poly carboxylic acid series water reducer is the 1wt% of cement, and flyash is the 20wt% of cement, water 50wt%. Water-cement ratio is 0.235. With volume of concrete total amount for standard, gangue coarse aggregate accounts for 45%, sandstone fine aggregate 25%, and joined Binder Materials accounting example is 30%.
Raw material precise, wherein the measurement deviation of cement, water reducer and water is �� 1.5%, and coarse-fine aggregate measurement deviation is �� 3.0%, carries out blanking stirring in strict accordance with match ratio. Stirring is first poured admixture, cement, water, flyash and water reducer into and is stirred no less than 15min in blender, is subsequently poured into coarse-fine aggregate and is stirred for 25min. Then in-molded in 100 �� 100 �� 100 standard examinations, put into standard curing box maintenance afterwards. 3 days average intensity value of test sample product are 29.3MPa after tested, and 28 days average intensity value are 41.2MPa.
Other performance test of the concrete of above two proportioning is evaluated, and is 21.4cm through test concrete mix slump meansigma methods, and divergence is 53.2cm. Segregability is evaluated, and when vibrating after concrete mixing 6 seconds, mixture is substantially not stratified. Vibrating time be more than or equal to 10 seconds after, coarse aggregate mass segregation degree will be greater than 10%. Concrete chloride permeability ability is tested by durability according to ASTM (1202.94) standard, and average chloride diffusion coefficient is 5.212 �� 10-9cm2/ S. The high performance concrete that to sum up present invention is main raw material(s) with the gangue of design, has good fluidity, does not isolate, the feature such as good, the good endurance of mechanical property. Technical matters is simple and reliable, and considers energy saving technique technology. In technique, gangue consumption is big, can effectively reduce the gangue pollution to environment, is highly suitable for the remote countryside that industrial or agricultural infrastructure construction such as highway, building, structures etc., particularly southwest gangue are abundant and relatively backward.

Claims (9)

1. the method preparing high performance concrete for primary raw material with gangue, it is characterised in that comprise the following steps:
First, gangue is carried out crushing and screening, obtain frangible powdery gangue and the non-friable greatly lumped coal spoil of hardness;
Secondly, described lumped coal spoil being broken for the continuous size fraction material of 10��60mm again, then washing and drying is standby as coarse aggregate;
Then, being dried by the precipitate obtained in water-washing process, after preheating together with powdery gangue, at the temperature lower calcination of 400 DEG C��650 DEG C, the product after calcining adds the common pipe of alkali-activator and wears into fine powder as admixture;
Finally, the Binder Materials that admixture, Portland cement, water, polycarboxylic acid series high efficiency water reducing agent, flyash etc. are coordinated, press proportioning with sandstone fine aggregate and described coarse aggregate, uniformly mix and namely obtain final high performance concrete.
2. the method preparing high performance concrete for primary raw material with gangue according to claim 1, it is characterised in that described gangue is carrying out crushing and screening in medium tubulose disintegrating machine.
3. the method preparing high performance concrete for primary raw material with gangue according to claim 2, it is characterized in that, described include tilting pipe mill cylinder (2) from medium tubulose disintegrating machine, the feed opening of the undertaking loading hopper (1) suitable for reading of pipe mill cylinder (2), the end opening of pipe mill cylinder (2) connects with it with the tilting rotary screen (4) of angle, rotary screen (4) is outside equipped with sorting cover (3), the barrel dliameter of described rotary screen (4) grinds the barrel dliameter of cylinder (2) less than pipe, pipe mill cylinder (2) barrel dliameter 1800-3600mm, tube length 4000-5500mm, the barrel dliameter 1600-3200mm of rotary screen (4), tube length 1500-3000mm, the angle of described pipe mill cylinder (2) and horizontal direction is 3-5 degree, the range of speeds: 10-18r/min, sorting granularity: 0.05-100mm, the aperture of rotary screen (4): 0.05-30mm.
4. the method preparing high performance concrete for primary raw material with gangue according to claim 1, it is characterised in that described alkali-activator is NaAlO2��Na2SiO3Or NaOH.
5. the method preparing high performance concrete for primary raw material with gangue according to claim 1, it is characterized in that, described admixture, Portland cement, water, polycarboxylic acid series high efficiency water reducing agent, flyash constitute Binder Materials, sandstone fine aggregate consumption is the 25%��35% of concrete cumulative volume, coarse aggregate consumption is the 35%��50% of concrete cumulative volume, and gel material content is the 25%��40% of concrete cumulative volume.
6. the method preparing high performance concrete for primary raw material with gangue according to claim 1, it is characterized in that, described gel material content is the 40% of concrete cumulative volume, and sandstone fine aggregate consumption is the 35% of concrete cumulative volume, and coarse aggregate consumption is the 25% of concrete cumulative volume; Described gel material content is the 25% of concrete cumulative volume, and sandstone fine aggregate consumption is the 25% of concrete cumulative volume, and coarse aggregate consumption is the 50% of concrete cumulative volume, and described water-cement ratio ranges for 0.21��0.28.
7. the method preparing high performance concrete for primary raw material with gangue according to claim 5 or 6, it is characterized in that, described alkali-activator consumption is the 1wt%��12wt% of Portland cement consumption, in Binder Materials, admixture consumption is the 80wt%��130wt% of Portland cement consumption, poly carboxylic acid series water reducer consumption is the 0.1wt%��1.5wt% of Portland cement consumption, flyash consumption is the 3wt%��25wt% of Portland cement consumption, and water consumption is the 45wt%��75wt% of Portland cement consumption.
8. the method preparing high performance concrete for primary raw material with gangue according to claim 5 or 6, it is characterized in that, described coarse aggregate and sandstone fine aggregate carry out continuous size fraction grating, flat-elongated particles thing content is not more than 3%��9%, clay content is not more than 2%, and clod content is not more than 0.3%��0.5%.
9. the method preparing high performance concrete for primary raw material with gangue according to claim 1, it is characterized in that, described gangue is the gangue in six dish water areas, demarcates its mineral chemistry composition with the weight/mass percentage composition of oxide, for: the SiO of 46.82%2, the CaO of 1.01%, the MgO of 1.86%, the Al of 19.362O3, the Fe of 12.34%2O3, the K of 1.09%2O, the MnO of 0.11%, the TiO of 5.71%2, the loss on ignition of 11.67% and the impurity of surplus, loss on ignition is incubated calculating in 3 hours at 600 DEG C.
CN201510988421.4A 2015-12-24 2015-12-24 A kind of method that high performance concrete is prepared by primary raw material of gangue Active CN105622013B (en)

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CN107986656A (en) * 2017-12-06 2018-05-04 湖南鑫海环保科技有限公司 A kind of flyash and its preparation method and application
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
CN111470828A (en) * 2020-03-30 2020-07-31 辽宁工程技术大学 Novel fiber-reinforced alkali-activated slag concrete material and preparation method thereof
CN111702959A (en) * 2017-11-22 2020-09-25 陈波霖 Preparation method of high-performance concrete

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CN107417181A (en) * 2017-07-13 2017-12-01 山西恒久安建筑科技有限公司 Self-combusted gangue concrete interlayer floor
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CN111470828A (en) * 2020-03-30 2020-07-31 辽宁工程技术大学 Novel fiber-reinforced alkali-activated slag concrete material and preparation method thereof

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