CN112521074B - Coal gangue-based pervious concrete and preparation method thereof - Google Patents
Coal gangue-based pervious concrete and preparation method thereof Download PDFInfo
- Publication number
- CN112521074B CN112521074B CN202011461950.6A CN202011461950A CN112521074B CN 112521074 B CN112521074 B CN 112521074B CN 202011461950 A CN202011461950 A CN 202011461950A CN 112521074 B CN112521074 B CN 112521074B
- Authority
- CN
- China
- Prior art keywords
- coal gangue
- pervious concrete
- water
- particles
- acetic acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/44—Burning; Melting
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a coal gangue-based pervious concrete, which is prepared by mixing the following raw materials in percentage by mass: 65-70% of treated coal gangue, 16-24% of calcined coal gangue, 4-8% of water glass, 2-5% of sodium hydroxide, 0.5-1% of water reducer and 4-6% of water, wherein the treated coal gangue is coal gangue particles with the particle size of 5-10 mm obtained by activating treatment of mixed aqueous solution of hydrofluoric acid and acetic acid, and the calcined coal gangue is coal gangue particles with the particle size of less than 2mm obtained by calcining treatment. The permeable concrete completely uses the solid waste coal gangue as the aggregate and the cementing material, and realizes the high strength of the permeable concrete while ensuring the high permeability of the concrete.
Description
Technical Field
The invention belongs to the technical field of building materials, relates to pervious concrete, and particularly relates to pervious concrete prepared by using coal gangue as aggregate.
Background
The pervious concrete is an important component for sponge city construction, has the characteristics of multiple pores, water permeability and air permeability, can be used on pedestrian footpaths and large squares, and avoids surface water accumulation in rainy days.
At present, the common pervious concrete is prepared by taking cement as a cementing material, broken stones as aggregate and matching with a certain additive. However, the pervious concrete needs a large amount of natural gravels and cement, which is not favorable for national energy conservation and emission reduction and natural gravels resource saving, and the gravels mining and cement production are also not favorable for ecological environment protection.
The coal gangue is solid waste screened out in the coal mining and washing processing processes, the yield of the coal gangue accounts for about 10% -15% of the coal mining amount, the utilization rate is low, and the environment is seriously polluted by a large amount of stockpiled coal gangue. Although the coal gangue is gradually and widely used in order to meet the requirement of environmental protection in recent years, the utilization rate of the coal gangue is still less than 30%, most of the coal gangue is in an open-air stacking state, and environmental problems such as soil pollution, spontaneous combustion explosion of a gangue dump, air pollution and the like are easily caused.
Although coal gangue in different regions and different types has great difference in mineral composition and chemical composition due to different environments and output conditions, the main components of the coal gangue are kaolinite and alpha-SiO 2 And part of the coal gangue has certain strength and certain potential activity, and after proper treatment, the coal gangue has the potential effect of replacing natural broken stones or replacing cement, so that the full utilization of solid waste of the coal gangue can be realized.
At present, no related report that coal gangue is simultaneously used as a cementing material and an aggregate to prepare pervious concrete and avoid using cement and natural sandstone exists.
Disclosure of Invention
The invention aims to provide permeable concrete based on coal gangue and a preparation method of the permeable concrete, wherein the crushed and activated coal gangue is used as aggregate to replace natural macadam, and calcined coal gangue is used as cementing material to replace cement.
The permeable concrete based on the coal gangue is prepared by mixing the following raw materials in percentage by mass: 65-70% of treated coal gangue, 16-24% of calcined coal gangue, 4-8% of water glass, 2-5% of sodium hydroxide, 0.5-1% of water reducing agent and 4-6% of water.
The treated coal gangue is coal gangue particles with the particle size of 5-10 mm, which are obtained by activating crushed coal gangue with a mixed aqueous solution of hydrofluoric acid and acetic acid.
The calcined coal gangue is a coal gangue particle with the particle size less than 2mm after calcination treatment.
The permeable concrete of the invention uses coal gangue as main raw material, the broken stone in the traditional permeable concrete is replaced by the treated coal gangue after crushing and activating treatment, and the coal gangue powder generated during crushing is used for grinding and calcining to prepare calcined coal gangue to replace cement. The pervious concrete disclosed by the invention effectively utilizes the solid waste resource gangue while ensuring the performance of the concrete, saves natural broken stone and cement resources, reduces the preparation cost of the pervious concrete, and has higher economic benefit and environmental protection benefit.
The preparation method of the processed coal gangue comprises the following steps of crushing the coal gangue, screening coal gangue particles with the particle size of 5-10 mm, placing the coal gangue particles into a mixed aqueous solution of hydrofluoric acid and acetic acid, mixing and stirring, taking out, drying in the air, and preparing the processed coal gangue.
Preferably, the mixed aqueous solution of hydrofluoric acid and acetic acid is an aqueous solution prepared by adding water according to the mass ratio of the hydrofluoric acid to the acetic acid of 1: 1.
More preferably, the mass concentration of the mixed aqueous solution of hydrofluoric acid and acetic acid is 30%.
The screened coal gangue particles are placed in a mixed aqueous solution of hydrofluoric acid and acetic acid according to the mass ratio of 1:9 to be mixed and stirred, and preferably, the mixing and stirring time is not less than 20 min.
The preparation method of the calcined coal gangue comprises the steps of crushing the coal gangue into particles smaller than 2mm, heating to 720 ℃, preserving heat for not less than 1h, and cooling to obtain the calcined coal gangue.
Further, the water reducing agent is a naphthalene water reducing agent or a polycarboxylic acid water reducing agent.
The invention also provides a preparation method of the pervious concrete based on the coal gangue, which comprises the steps of mixing and stirring the treated coal gangue with the mass fraction, the calcined coal gangue, the water glass, the sodium hydroxide, the water reducing agent and half of the water with the mass fraction uniformly, adding the remaining water with the mass fraction, and continuously stirring uniformly to prepare the pervious concrete.
Wherein the stirring time is not less than 60 s.
More preferably, the stirring is continued for not less than 180s after the addition of the remaining mass fraction of water.
The permeable concrete of the invention totally uses solid waste coal gangue as aggregate and cementing material, reduces the consumption of natural sandstone resources and cement, and avoids resource waste.
According to the invention, hydrofluoric acid and acetic acid are adopted to activate the coal gangue particles, so that the binding capacity of the surfaces of the coal gangue particles and a cementing material is increased, and the high water permeability of the concrete is ensured, and the high strength of the pervious concrete is realized.
Detailed Description
The following examples further describe embodiments of the present invention. The following examples are only for more clearly illustrating the technical solutions of the present invention so as to enable those skilled in the art to better understand and utilize the present invention, and do not limit the scope of the present invention.
In the present invention, the terms such as "upper", "lower", "left", "right" and "middle" are used for clarity of description only, and are not used to limit the scope of the present invention, and the relative relationship changes or adjustments may be made without substantial technical changes and modifications.
The raw materials used in the examples of the present invention are not particularly limited in terms of source unless otherwise specified. Even materials purchased on the market can be prepared according to conventional methods well known to those skilled in the art.
The names and the short names of the process and the equipment adopted by the invention belong to the conventional names in the field, each name is quite clear and definite in the field of related application, and a person skilled in the art can understand the conventional process steps and apply the corresponding equipment according to the names.
The pervious concrete in the embodiment of the invention is prepared by the following method:
s1: and taking the coal gangue and crushing the coal gangue by using a crusher.
S2: and screening the crushed coal gangue to obtain coal gangue particles with the particle size of less than 5mm and coal gangue particles with the particle size of 5 mm-10 mm.
S3: and (3) further crushing the coal gangue particles with the particle size of less than 5mm in the S2 to ensure that the particle size of the coal gangue particles is less than 2mm, feeding the coal gangue particles into a kiln, heating to 750 ℃, preserving the heat for 1h, naturally cooling to room temperature, and taking out to obtain calcined coal gangue.
S4: hydrofluoric acid and acetic acid are mixed according to the mass ratio of 1:1, and water is added for dilution to obtain a 30% solution.
S5: mixing the coal gangue particles with the particle size of 5-10 mm in S2 and the solution in S4 according to the mass ratio of 90% to 10%, stirring for 20min, and airing to obtain the treated coal gangue.
S6: and (3) adding the calcined coal gangue in the S3 and the treated coal gangue in the S5, water glass, sodium hydroxide and a water reducing agent into a stirrer according to the dosage of each embodiment, adding water with the dosage of 50%, stirring and mixing for 60S, adding the remaining 50% of water, and continuously stirring for 180S to prepare the pervious concrete.
The pervious concrete prepared in each example was molded into test blocks, and after standard curing for 28 days, the flexural strength, compressive strength and water permeability coefficient of the hardened bodies were tested.
Examples 1 to 5
The raw material formulation for preparing the pervious concrete in examples 1 to 5 of the present invention is shown in table 1.
Through tests, the flexural strength, compressive strength and water permeability coefficient measurement data of the pervious concrete test blocks prepared in the examples 1-5 after standard curing for 28 days are shown in the table 2.
As can be seen from Table 2, compared with the standard value of the pervious concrete for buildings, the flexural strength, the compressive strength and the water permeability coefficient of the pervious concrete prepared in the embodiments 1 to 5 of the invention are all within the standard value range, and meet the standards for buildings.
The above embodiments of the present invention are not intended to be exhaustive or to limit the invention to the precise form disclosed. Various changes, modifications, substitutions and alterations to these embodiments will be apparent to those skilled in the art without departing from the spirit and scope of the present invention.
Claims (10)
1. The permeable concrete based on the coal gangue is formed by mixing the following raw materials in percentage by mass: 65 to 70 percent of treated coal gangue, 16 to 24 percent of calcined coal gangue, 4 to 8 percent of water glass, 2 to 5 percent of sodium hydroxide, 0.5 to 1 percent of water reducing agent and 4 to 6 percent of water,
the treated coal gangue is coal gangue particles with the particle size of 5-10 mm, which are obtained by activating crushed coal gangue with a mixed aqueous solution of hydrofluoric acid and acetic acid;
the calcined coal gangue is coal gangue particles with particle size less than 2mm after calcination treatment.
2. The pervious concrete of claim 1, wherein the treated coal gangue is prepared by crushing coal gangue, sieving coal gangue particles with a size of 5mm to 10mm, mixing and stirring the coal gangue particles in a mixed aqueous solution of hydrofluoric acid and acetic acid, taking out the mixture and drying the mixture in the air.
3. The pervious concrete of claim 1 or 2, wherein the mass ratio of hydrofluoric acid to acetic acid in the mixed aqueous solution of hydrofluoric acid and acetic acid is 1: 1.
4. The pervious concrete of claim 3, characterized in that the mixed aqueous solution of hydrofluoric acid and acetic acid has a mass concentration of 30%.
5. The pervious concrete as claimed in claim 2, characterized in that the screened coal gangue particles are mixed and stirred in the mixed aqueous solution of hydrofluoric acid and acetic acid for not less than 20min according to the mass ratio of 1: 9.
6. The pervious concrete of claim 1, wherein the calcined coal gangue is prepared by crushing coal gangue into particles smaller than 2mm, heating to 720 ℃, keeping the temperature for not less than 1h, and cooling.
7. The pervious concrete of claim 1, characterized in that the water reducing agent is a naphthalene based water reducing agent or a polycarboxylic acid water reducing agent.
8. The method for preparing the pervious concrete of claim 1, comprising the steps of mixing and stirring the treated coal gangue with the mass fraction, the calcined coal gangue, the water glass, the sodium hydroxide, the water reducing agent and half of the water with the mass fraction uniformly, adding the residual water with the mass fraction, and continuing to stir uniformly to prepare the pervious concrete.
9. The method according to claim 8, wherein the stirring time is not less than 60 seconds.
10. The process according to claim 8 or 9, wherein the remaining mass fraction of water is added and stirring is continued for not less than 180 s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011461950.6A CN112521074B (en) | 2020-12-14 | 2020-12-14 | Coal gangue-based pervious concrete and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011461950.6A CN112521074B (en) | 2020-12-14 | 2020-12-14 | Coal gangue-based pervious concrete and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112521074A CN112521074A (en) | 2021-03-19 |
| CN112521074B true CN112521074B (en) | 2022-08-19 |
Family
ID=74999435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011461950.6A Active CN112521074B (en) | 2020-12-14 | 2020-12-14 | Coal gangue-based pervious concrete and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112521074B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT979952B (en) * | 1972-03-23 | 1974-09-30 | Perlmooser Ag | CEMENT AND RELATED CONCRETE CONCRETE AS WELL AS PROCEDURE FOR THEIR PRODUCTION |
| CN105622013B (en) * | 2015-12-24 | 2017-08-29 | 六盘水师范学院 | A kind of method that high performance concrete is prepared by primary raw material of gangue |
| CN109133683B (en) * | 2018-08-16 | 2020-07-31 | 山东大学 | Comprehensive and integrated utilization method of coal gangue |
| CN109369079A (en) * | 2018-11-26 | 2019-02-22 | 安徽理工大学 | A method of alkali-activated carbonatite coal gangue concrete is prepared by primary raw material of gangue |
| CN110158397A (en) * | 2019-06-28 | 2019-08-23 | 淮南东辰集团有限责任公司 | A kind of gangue pervious surface and production and construction method |
-
2020
- 2020-12-14 CN CN202011461950.6A patent/CN112521074B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112521074A (en) | 2021-03-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104446045A (en) | Alkali-activated cementing material and preparation method thereof | |
| CN108774041A (en) | A kind of water-permeable brick and preparation method thereof for making aggregate with artificial carbonization slag bead | |
| CN107417214B (en) | A kind of Tungsten tailing blending concrete and preparation method thereof | |
| CN112110705B (en) | Self-repairing semi-rigid base material for recycling construction waste | |
| CN109896770B (en) | Concrete reinforcing agent | |
| CN104609760A (en) | Blast-furnace slag powder activity activator | |
| CN102659370B (en) | Mineral admixture concrete and preparation method thereof | |
| CN105060786A (en) | Feldspar waste material concrete and preparation method thereof | |
| CN109305792B (en) | Soil curing agent, preparation method and soil curing construction method | |
| CN111908862A (en) | Renewable environment-friendly pervious concrete and preparation method thereof | |
| CN109970405A (en) | A kind of concrete and preparation method thereof | |
| CN113501696A (en) | Environment-friendly anti-permeability concrete and preparation method thereof | |
| CN108373284A (en) | Pervious concrete improver and preparation method thereof | |
| CN113860802A (en) | Environment-friendly high-performance mineral admixture and preparation method and application thereof | |
| CN112876175A (en) | Self-curing recycled brick-concrete aggregate concrete and preparation method thereof | |
| CN104556785B (en) | Water reducing type metakaolin base slight expansion compacting agent and preparation method thereof | |
| CN101412595A (en) | Method for preparing concrete admixture from kaoline tailing | |
| CN106698988A (en) | Carbonatite-modified phosphogypsum , and preparation method of carbonatite-modified phosphogypsum | |
| CN113998939A (en) | Phosphogypsum-based super-retarding concrete and preparation method thereof | |
| CN114230270A (en) | Shield synchronous grouting material and preparation method thereof | |
| CN108191346A (en) | A kind of assembled architecture sleeve grouting material | |
| CN112521074B (en) | Coal gangue-based pervious concrete and preparation method thereof | |
| CN115974477B (en) | Ultra-high performance concrete containing rare earth polishing powder waste and preparation method thereof | |
| CN110304882A (en) | A kind of Phosphogypsum base polymer iron tailings sand concrete and preparation method thereof | |
| CN108530015A (en) | A kind of steamed brick and preparation method thereof using bauxite gangue manufacture |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |