CN112707700A - Single-particle-level coal gangue self-compacting concrete - Google Patents
Single-particle-level coal gangue self-compacting concrete Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 112
- 239000011376 self-consolidating concrete Substances 0.000 title claims abstract description 39
- 239000002245 particle Substances 0.000 title claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000004568 cement Substances 0.000 claims abstract description 17
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 16
- 239000010881 fly ash Substances 0.000 claims abstract description 16
- 239000004576 sand Substances 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000012216 screening Methods 0.000 claims description 15
- 239000004575 stone Substances 0.000 claims description 6
- 239000011398 Portland cement Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 239000008399 tap water Substances 0.000 claims description 3
- 235000020679 tap water Nutrition 0.000 claims description 3
- 239000004567 concrete Substances 0.000 abstract description 19
- 239000000463 material Substances 0.000 abstract description 8
- 238000006703 hydration reaction Methods 0.000 abstract description 7
- 238000010521 absorption reaction Methods 0.000 abstract description 6
- 230000036571 hydration Effects 0.000 abstract description 6
- 238000002360 preparation method Methods 0.000 abstract description 5
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 11
- 238000003756 stirring Methods 0.000 description 9
- 239000000203 mixture Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000005303 weighing Methods 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920005646 polycarboxylate Polymers 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 239000008030 superplasticizer Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000002843 carboxylic acid group Chemical group 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000003334 potential effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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
- C04B28/04—Portland cements
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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)
- Inorganic Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a single-particle-grade coal gangue self-compacting concrete which comprises the following raw material components in parts by weight: 592-761 parts of natural aggregate; 85-254 parts of coal gangue; 700-800 parts of river sand; 100-130 parts of fly ash; 400-500 parts of cement; 1-3 parts of a water reducing agent; 190-210 parts of water; the coal gangue is single-grain coal gangue with the grain size range of 10-20 mm. The single-particle-grade coal gangue self-compacting concrete provided by the invention adopts the single-particle-grade coal gangue aggregate, compared with the existing continuous-grade coal gangue aggregate, the single-particle-grade coal gangue self-compacting concrete is convenient to screen and greatly reduces the preparation cost; the characteristics of large porosity and strong water absorption of the crushed coal gangue are utilized, the coal gangue is used as an internal curing material, the later hydration of the concrete is promoted, and the strength of the concrete is improved; and the coal gangue is used for replacing part of natural aggregate, so that the problem of environmental pollution is effectively solved, the problem of scarcity of natural coarse aggregate in China is solved, and the coal gangue aggregate has high economic benefit.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to single-particle-grade coal gangue self-compacting concrete adopting coal gangue as single-particle-grade aggregate to replace partial natural coarse aggregate.
Background
The coal gangue is waste residue generated in the coal mine production process, is one of the industrial wastes with the largest annual emission and accumulated inventory in China, the annual emission is equivalent to l 0-15% of the annual coal yield, the coal gangue accounts for more than 40% of the total emission of the solid wastes in China, and the accumulated inventory is about more than 45 hundred million tons at present. Most of coal gangues in China are treated in a simple stockpiling mode to form thousands of seats in large and small gangue hills, and environmental rock-soil effects such as pollution (water, soil and atmosphere), spontaneous combustion, land occupation, explosion, structural erosion, instability and the like are generated due to the physical and chemical actions such as weathering, leaching, oxidation spontaneous combustion and the like caused by the weather of wind all the year round, so that the environment of a mining area tends to be deteriorated day by day, and dynamic disaster accidents such as mud-rock flow and the like can also occur due to the instability of deposits, so that the normal and safe production of mines is seriously damaged, huge economic loss is brought, and great threat is brought to the normal life of people in urban areas.
Self-compacting concrete is a novel high performance concrete, has higher mobility, does not need during the construction to vibrate and just can be full of the template, is particularly useful for the pouring of the intensive district concrete of reinforcing bar, has greatly improved the efficiency of construction to the pouring quality of concrete has been guaranteed.
At present, the existing coal gangue concrete is prepared by crushing and screening coal gangue to prepare continuous graded concrete, and the aggregate preparation process is complex and has low efficiency. And the porosity of the crushed coal gangue is high, the water absorption rate is 2-5 times of that of the common coarse aggregate, and the mixture is more viscous when being stirred, so that the slump loss is high, and the construction performance is poor.
Therefore, in order to solve the technical problems, a need exists for a single-grain-grade gangue self-compacting concrete.
Disclosure of Invention
The invention aims to provide a single-particle-grade coal gangue self-compacting concrete which adopts coal gangue as a single-particle-grade coarse aggregate to replace part of natural coarse aggregate so as to solve the problems in the prior art.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the single-particle-grade coal gangue self-compacting concrete comprises the following raw material components in parts by weight:
the coal gangue is single-grain coal gangue with the grain size range of 10-20 mm.
Further, the single-particle-grade coal gangue self-compacting concrete comprises the following raw material components in parts by weight:
further, the single-particle-grade coal gangue self-compacting concrete comprises the following raw material components in parts by weight:
further, the single-particle-grade coal gangue self-compacting concrete comprises the following raw material components in parts by weight:
furthermore, the single-particle-grade coal gangue is prepared by crushing and screening coal gangue, and then respectively sieving through a circular hole sieve with the diameter of 20mm and a circular hole sieve with the diameter of 10mm and the diameter of 20 mm.
Further, the natural aggregate is crushed stone with continuous particle size fraction of 5-20 mm.
Further, the cement is P.O 42.5 ordinary portland cement.
Further, the river sand is medium sand with fineness modulus of 2.39.
Further, the water reducing agent is a polycarboxylic acid water reducing agent.
Further, the fly ash is grade I fly ash, and/or the water is tap water.
The invention has the beneficial effects that:
compared with the prior art, the single-particle-grade coal gangue self-compacting concrete provided by the invention adopts the single-particle-grade coal gangue aggregate, is convenient to screen and greatly reduces the preparation cost compared with the existing continuous-grade coal gangue aggregate; the characteristics of large porosity and strong water absorption of the crushed coal gangue are utilized, the coal gangue is used as an internal curing material, the later hydration of the concrete is promoted, and the strength of the concrete is improved; and the coal gangue is used for replacing part of natural aggregate, so that the problem of environmental pollution is effectively solved, the problem of scarcity of natural coarse aggregate in China is solved, and the coal gangue aggregate has high economic benefit.
Detailed Description
In order to more fully understand the technical contents of the present invention, the technical solutions of the present invention will be further described and illustrated by the following specific examples.
In the following description, "%" and "part" representing amounts are based on weight unless otherwise specified. Unless otherwise indicated, all numbers expressing feature sizes, quantities, and physical characteristics used in the specification and claims are to be understood as being modified in all instances by the term "about". Accordingly, unless indicated to the contrary, the numerical parameters set forth in the foregoing specification and attached claims are approximations that can be suitably varied by those skilled in the art in seeking to obtain the desired properties utilizing the teachings disclosed herein. The use of numerical ranges by endpoints includes all numbers within that range and any range within that range, for example, 1 to 5 includes 1, 1.2, 1.4, 1.55, 2, 2.75, 3, 3.80, 4, and 5, and the like.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus; the term "preferred" refers to a preferred alternative, but is not limited to only the selected alternative.
The invention provides a single-particle-grade coal gangue self-compacting concrete which comprises the following raw material components in parts by weight: 592-761 parts of natural aggregate; 85-254 parts of coal gangue; 700-800 parts of river sand; 100-130 parts of fly ash; 400-500 parts of cement; 1-3 parts of a water reducing agent; 190-210 parts of water; the coal gangue is single-grain coal gangue with the grain size range of 10-20 mm.
In a preferred embodiment, the single-particle-grade coal gangue self-compacting concrete comprises the following raw material components in parts by weight: 761 parts of natural aggregate; 85 parts of coal gangue; 700-800 parts of river sand; 100-130 parts of fly ash; 400-500 parts of cement; 1-3 parts of a water reducing agent; 190-210 parts of water; the coal gangue is single-grain coal gangue with the grain size range of 10-20 mm.
In another preferred embodiment, the single-particle-grade coal gangue self-compacting concrete comprises the following raw material components in parts by weight: 676 parts of natural aggregate; 169 parts of coal gangue; 700-800 parts of river sand; 100-130 parts of fly ash; 400-500 parts of cement; 1-3 parts of a water reducing agent; 190-210 parts of water; the coal gangue is single-grain coal gangue with the grain size range of 10-20 mm.
In another preferred embodiment, the single-particle-grade coal gangue self-compacting concrete comprises the following raw material components in parts by weight: 592 parts of natural aggregate; 254 parts of coal gangue; 700-800 parts of river sand; 100-130 parts of fly ash; 400-500 parts of cement; 1-3 parts of a water reducing agent; 190-210 parts of water; the coal gangue is single-grain coal gangue with the grain size range of 10-20 mm.
The natural aggregate in examples and comparative examples in the present application is preferably 5 to 2Crushed stone of 0mm continuous size fraction and having an apparent density of 2.81g/cm3Bulk density of 1.41g/cm3The water absorption was 1.32%. The crushed stone can be river gravel, sea gravel, mountain gravel, crushed stone, slag crushed stone, etc.
The coal gangue in the examples and comparative examples in the application is preferably single-grain coal gangue prepared by crushing and screening natural coal gangue, and then respectively passing through a circular hole sieve with the diameter of 20mm and a circular hole sieve with the diameter of 10mm and the diameter of 20mm, and screening out coal gangue particles with the diameter of less than 10mm and more than 20 mm. The preparation method of the single-particle-grade coal gangue is simple, and the defects that conventional continuous graded coal gangue coarse aggregates need to be subjected to multiple crushing, screening and weighing mixing, the process is complex, the efficiency is low, and the operability is poor are avoided. The main chemical components of the single-particle-grade coal gangue are shown in a table 1:
TABLE 1-major chemical composition of single-particle grade gangue (%)
| CaO | MgO | Al2O3 | SiO2 | Fe2O3 | K2O | Na2O | Loss | Total |
| 2.53 | 2.01 | 19.44 | 59.32 | 8.85 | 2.19 | 1.18 | 1.73 | 97.25 |
The river sand in the examples and comparative examples in the present application is preferably medium sand having a fineness modulus of 2.39 and an apparent density of 2.67g/cm3The bulk density was 1.43g/cm3The water content was 0.44%.
The fly ash in the examples and comparative examples herein is preferably a class I fly ash having an apparent density of 2.09g/cm3. Fly ash is fine ash collected from flue gas generated after coal combustion, and is main solid waste discharged from coal-fired power plants.
The cement in examples and comparative examples in the present application is preferably P.O 42.5 ordinary portland cement having an apparent density of 3.11g/cm3。
The water-reducing agent in the examples and comparative examples in this application is preferably a polycarboxylic acid water-reducing agent. The Polycarboxylate Superplasticizer (Polycarboxylate Superplasticizer) is a high-performance water reducer, is a cement dispersant in cement concrete application, can be chemically divided into two types, and one type is a polyester structure taking methacrylic acid as a main chain and taking carboxylic acid group and MPEG (methoxy polyethylene glycol) as side chains; the other is a polyether structure with polyacrylic acid as a main chain and Vinyl alcohol polyethylene glycol as a side chain.
The water in the examples and comparative examples in the present application is preferably tap water, and the water-cement ratio is preferably 0.4 to 0.45.
Example 1
And crushing and screening the natural coal gangue, and then respectively passing through a circular hole sieve with the diameter of 20mm and a circular hole sieve with the diameter of 10mm, and screening out coal gangue particles with the diameter of 20mm, which are smaller than the diameter of 10mm, to obtain 10-20 mm single-particle-grade coal gangue.
Weighing 761 parts of natural aggregate, 85 parts of single-grain-grade coal gangue, 732 parts of river sand, 104 parts of fly ash, 406 parts of cement and 2 parts of water reducing agent, sequentially putting into a stirrer, and dry-mixing for 2min to obtain a dry-mixed material.
And then adding 203 parts of water into the dry mixture, and continuing stirring for 2min to obtain the single-particle-grade coal gangue self-compacting concrete.
Example 2
And crushing and screening the natural coal gangue, and then respectively passing through a circular hole sieve with the diameter of 20mm and a circular hole sieve with the diameter of 10mm, and screening out coal gangue particles with the diameter of 20mm, which are smaller than the diameter of 10mm, to obtain 10-20 mm single-particle-grade coal gangue.
Weighing 676 parts of natural aggregate, 169 parts of single-particle-grade coal gangue, 732 parts of river sand, 104 parts of fly ash, 406 parts of cement and 2 parts of water reducing agent, sequentially putting into a stirrer, and performing dry stirring for 2min to obtain a dry-mixed material.
And then adding 203 parts of water into the dry mixture, and continuing stirring for 2min to obtain the single-particle-grade coal gangue self-compacting concrete.
Example 3
And crushing and screening the natural coal gangue, and then respectively passing through a circular hole sieve with the diameter of 20mm and a circular hole sieve with the diameter of 10mm, and screening out coal gangue particles with the diameter of 20mm, which are smaller than the diameter of 10mm, to obtain 10-20 mm single-particle-grade coal gangue.
Weighing 592 parts of natural aggregate, 254 parts of single-particle-grade coal gangue, 732 parts of river sand, 104 parts of fly ash, 406 parts of cement and 2 parts of water reducing agent, sequentially putting into a stirrer, and performing dry stirring for 2min to obtain a dry stirring material.
And then adding 203 parts of water into the dry mixture, and continuing stirring for 2min to obtain the single-particle-grade coal gangue self-compacting concrete.
Comparative example 1
And crushing and screening the natural coal gangue, and then respectively passing through a circular hole sieve with the diameter of 20mm and a circular hole sieve with the diameter of 10mm, and screening out coal gangue particles with the diameter of 20mm, which are smaller than the diameter of 10mm, to obtain 10-20 mm single-particle-grade coal gangue.
Weighing 846 parts of natural aggregate, 732 parts of river sand, 104 parts of fly ash, 406 parts of cement and 2 parts of water reducing agent, sequentially putting into a stirrer, and performing dry stirring for 2min to obtain a dry stirring material.
And then adding 203 parts of water into the dry mixture, and continuing stirring for 2min to obtain the single-particle-grade coal gangue self-compacting concrete.
Working performance test
Table 2-results of the tests on the working properties of the single-grain-grade gangue self-compacting concrete prepared in the examples and comparative examples:
as can be seen from Table 2, the slump-expansion degree of the fresh concrete under different single-particle-level gangue mixing amounts is SF2 level, and the segregation resistance is SR2 level; meets the relevant conditions of the working performance of the self-compacting concrete in the specification.
Test for compressive Strength
TABLE 3 compressive Strength of Single-grain-grade coal gangue self-compacting concrete prepared in examples and comparative examples
By combining the examples 1-3 and the comparative example 1, as can be seen from table 3, the strength of the single-grain-grade coal gangue self-compacting concrete provided by the invention is obviously higher than that of the common concrete in the later stage. This is because the coal gangue has potential activity and can be hydrated with cement to produce Ca (OH)2The secondary hydration reaction occurs, thereby reducing Ca (OH) in the concrete pore solution2The concentration of the secondary hydration product can promote the continuous hydration of the cement, and the secondary hydration product can fill the primary holes of the concrete, thereby improving the mixingCompactness and strength of the concrete; meanwhile, the crushed coal gangue has high water absorption and high water content and can be used as an internal curing material of concrete.
In conclusion, the single-particle-grade coal gangue self-compacting concrete provided by the invention adopts the single-particle-grade coal gangue aggregate, and compared with the existing continuous-grade coal gangue aggregate, the single-particle-grade coal gangue self-compacting concrete is convenient to screen and greatly reduces the preparation cost; the characteristics of large porosity and strong water absorption of the crushed coal gangue are utilized, the coal gangue is used as an internal curing material, the later hydration of the concrete is promoted, and the strength of the concrete is improved; moreover, the coal gangue is used for replacing part of natural aggregate, so that the problem of environmental pollution is effectively solved, the problem of scarcity of natural coarse aggregate in China is solved, and the coal gangue aggregate has high economic benefit; meanwhile, reasonable concrete matching ratio and sand rate are used, so that the single-particle-grade coal gangue self-compacting concrete has high fluidity.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The single-particle-grade coal gangue self-compacting concrete is characterized by comprising the following raw material components in parts by weight:
the coal gangue is single-grain coal gangue with the grain size range of 10-20 mm.
2. The single-particle-grade coal gangue self-compacting concrete according to claim 1, which comprises the following raw material components in parts by weight:
3. the single-particle-grade coal gangue self-compacting concrete according to claim 1, which comprises the following raw material components in parts by weight:
4. the single-particle-grade coal gangue self-compacting concrete according to claim 1, which comprises the following raw material components in parts by weight:
5. the single-particle-grade coal gangue self-compacting concrete according to any one of claims 1 to 4, wherein the single-particle-grade coal gangue is prepared by crushing and screening coal gangue, then respectively passing through a circular hole sieve with the diameter of 20mm and a circular hole sieve with the diameter of 10mm, and screening out coal gangue particles with the diameter of 20 mm.
6. The single-grain-grade coal gangue self-compacting concrete as claimed in any one of claims 1 to 4, wherein the natural aggregate is crushed stone of 5 to 20mm continuous grain size.
7. The single-grain-grade coal gangue self-compacting concrete as claimed in any one of claims 1 to 4, wherein the cement is P.O 42.5 ordinary portland cement.
8. The single-grain-grade coal gangue self-compacting concrete as claimed in any one of claims 1 to 4, wherein the river sand is medium sand with fineness modulus of 2.39.
9. The single-grain-grade coal gangue self-compacting concrete as claimed in any one of claims 1 to 4, wherein the water reducing agent is a polycarboxylic acid water reducing agent.
10. The single-grain-grade coal gangue self-compacting concrete as claimed in any one of claims 1 to 4, wherein the fly ash is grade I fly ash, and/or the water is tap water.
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| CN202011587929.0A CN112707700A (en) | 2020-12-29 | 2020-12-29 | Single-particle-level coal gangue self-compacting concrete |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3313727A1 (en) * | 1983-04-15 | 1984-10-18 | Bergwerksverband Gmbh, 4300 Essen | Process for producing dam-building and backfill materials |
| CN103936369A (en) * | 2014-04-18 | 2014-07-23 | 张家港江苏科技大学产业技术研究院 | Grade-C30 single-particle regenerated self-compaction concrete and preparation method thereof |
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2020
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| CN103936369A (en) * | 2014-04-18 | 2014-07-23 | 张家港江苏科技大学产业技术研究院 | Grade-C30 single-particle regenerated self-compaction concrete and preparation method thereof |
| CN110002825A (en) * | 2019-05-09 | 2019-07-12 | 湖南双晟科技信息咨询有限公司 | A kind of preparation method of coal gangue concrete |
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