CN117510162A - High-toughness coal gasification ash concrete gel material and preparation method thereof - Google Patents
High-toughness coal gasification ash concrete gel material and preparation method thereof Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 124
- 238000002309 gasification Methods 0.000 title claims abstract description 120
- 239000004567 concrete Substances 0.000 title claims abstract description 113
- 239000000463 material Substances 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 54
- 239000004568 cement Substances 0.000 claims abstract description 53
- 239000000843 powder Substances 0.000 claims abstract description 47
- 239000002893 slag Substances 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 61
- 239000004576 sand Substances 0.000 claims description 34
- 239000003638 chemical reducing agent Substances 0.000 claims description 33
- 239000002245 particle Substances 0.000 claims description 27
- 239000000203 mixture Substances 0.000 claims description 24
- 239000004575 stone Substances 0.000 claims description 19
- 239000002994 raw material Substances 0.000 claims description 12
- 239000011398 Portland cement Substances 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 abstract description 12
- 239000002910 solid waste Substances 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000004566 building material Substances 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- 230000035939 shock Effects 0.000 abstract description 2
- 238000009776 industrial production Methods 0.000 abstract 1
- 239000002440 industrial waste Substances 0.000 abstract 1
- 239000002956 ash Substances 0.000 description 112
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 33
- 230000000052 comparative effect Effects 0.000 description 13
- 238000009826 distribution Methods 0.000 description 11
- 238000006703 hydration reaction Methods 0.000 description 7
- 239000000292 calcium oxide Substances 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910021532 Calcite Inorganic materials 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 229910001653 ettringite Inorganic materials 0.000 description 2
- 238000001879 gelation Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011325 microbead Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000008030 superplasticizer Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a high-toughness coal gasification ash concrete gel material and a preparation method thereof, belonging to the technical field of building materials. The invention prepares the high-toughness concrete by controlling the mixing amount of the gasified ash slag powder and the effective chemical components of the cementing material and replacing part of cement with the gasified ash slag powder. The coal gasification ash concrete prepared by the method has obviously changed mechanical properties, particularly obviously improved flexural strength and tensile strength and obviously enhanced toughness, and shows that the concrete has excellent shock resistance, durability and safety. The coal gasification ash residue resource recycling technology provided by the method saves resources and energy, is beneficial to industrial production, can treat a large amount of industrial waste residues, and can realize large-scale high-value comprehensive utilization of large amounts of industrial solid waste.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a high-toughness coal gasification ash concrete gel material and a preparation method thereof.
Background
China is a country where coal consumption is large, the discharge amount of coal gasification ash exceeds 5000 ten thousand tons each year, and the method for treating the coal gasification ash is particularly important. If the land is simply and directly buried, precious land resources are occupied, and in addition, the infiltration or dust generated in a landfill site is easy to cause environmental pollution, so that the health of people is directly or indirectly endangered. If the coal gasification ash is directly used as a filling material and aggregate, the use value of the coal gasification ash is low. Therefore, the adoption of the environment-friendly, high-value recycling and large-scale mode for treating the coal gasification slag is not only an urgent need of low-carbon cyclic development of coal chemical enterprises, but also an inherent requirement of improving the development and utilization benefits of coal resources and constructing a green low-carbon economy.
Concrete strength, durability are generally a focus of technical attention in concrete engineering. The strength grade of the concrete is determined according to the compression resistance value, and is the most important parameter in the concrete engineering. The tensile properties such as fracture resistance, splitting resistance and the like are less in value and change, and general research is less focused. The concrete technology research is focused on improving the compressive strength of concrete, and the research on tensile property is very little. Theoretically, it is more effective to increase the load bearing capacity and deformation of the concrete member than to increase the tensile strength of the concrete. Therefore, there is a need to search for methods for improving the tensile strength of concrete to improve the strength and durability of concrete and to obtain high toughness concrete.
Coal gasification ash belongs to waste materials in coal chemical industry production. The chemical composition analysis of coal gasification ash slag shows that the material has the possibility of material activation, and certain conditions are provided for forming better volcanic ash reaction, wherein the content of silicon (Si) is 34.43%, the content of calcium (Ca) is 30.35%, the content of aluminum (Al) is 13.73%, the content of iron (Fe) is 12.19%, and the content of the rest trace elements is 9.39%. But the ore phase of the gas slag is mainly amorphous phase and quartz, and is mixed with ore phases such as calcite, corundum and the like, and the chemical reaction and the gelation activity are low. This is a major obstacle to large-scale and high-value utilization of coal gasification ash. Activation of coal gasification ash is therefore currently the most viable and effective solution. The mixing amount of coal gasification ash is increased, the concrete is prepared, the cement consumption can be reduced, the storage of industrial solid waste is eliminated, and the concrete cost is obviously reduced. Due to the differences in the raw material combination and the proportion, the final properties of the concrete will also be different. Therefore, the proper mixing ratio of the gas slag concrete is designed, so that conditions can be provided for improving the performance of the concrete, and the gas slag concrete is one of key factors for improving the performance of concrete products.
The raw materials of the coal gasification ash concrete comprise cement, coal gasification ash, sand, stone, water, additives and the like, and the change of the properties and the mixing amount of the raw materials has great influence on the strength, the durability and the high toughness of the cement concrete. Therefore, how to effectively design the construction mixing ratio according to the properties of the raw materials, realize the high toughness property of the cement concrete, and simultaneously consider the economical efficiency is a difficult problem to be solved in the current practical application.
Disclosure of Invention
In view of the above, the invention aims to provide a high-toughness coal gasification ash concrete gel material and a preparation method thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
a high-toughness coal gasification ash concrete gel material comprises the following raw materials in percentage by mass: 256-405 parts of cement, 32-90 parts of coal gasification ash powder, 720-762 parts of sand, 1081-1144 parts of stone, 3.2-4.2 parts of water reducer and 165-170 parts of water.
Preferably, the high-toughness coal gasification ash concrete gel material comprises the following raw materials in percentage by mass: 288 parts of cement, 72 parts of coal gasification ash slag powder, 750 parts of sand, 1125 parts of stone, 3.6 parts of water reducer and 165 parts of water.
Preferably, the gel material comprises 19.9% -23.3% of SiO by mass 2 7.5 to 9.1 percent of Al 2 O 3 53.9% -60.6% of CaO.
Preferably, the preparation method of the coal gasification ash slag powder comprises the following steps: drying coal gasification ash slag, grinding and sieving to obtain coal gasification ash slag powder; the screening is a square hole screen with the aperture of 0.15 mm.
Preferably, the mass ratio of particles with the particle size smaller than 50 μm in the coal gasification ash powder is more than 90%.
Preferably, the cement is a 42.5 strength grade portland cement.
Preferably, the sand is yellow sand with particle diameter of less than 4.75mm and bulk density of 1450m 3 。
Preferably, the cobble is continuous graded gravels with the particle size within the range of 5-25 mm.
Preferably, the water reducer is a polycarboxylic acid high-efficiency water reducer.
The invention also provides a preparation method of the high-toughness coal gasification ash concrete gel material, which comprises the following steps:
mixing cement, coal gasification ash slag powder, sand and stones to obtain a mixture;
and mixing the water reducer with water, adding the obtained mixture into the mixture, stirring and molding to obtain the high-toughness coal gasification ash concrete gel material.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a high-toughness coal gasification ash concrete gel material, which is prepared by drying, grinding, screening and activating coal gasification ash, precisely controlling the granularity distribution of the coal gasification ash, replacing part of cement with coal gasification ash powder, and adjusting the blending amount of the ash powder and the effective chemical components of the gel material. The coal gasification ash concrete prepared by the method has obviously changed mechanical properties, particularly obviously improved flexural strength and tensile strength and obviously enhanced toughness, and shows that the concrete has excellent shock resistance, durability and safety. Compared with the traditional concrete, the tensile strength is greatly improved. The coal gasification ash slag powder is used for replacing part of cement in the concrete, so that the cement consumption is reduced, a large amount of solid waste materials are consumed, meanwhile, the toughness of the concrete is obviously improved, the use value of the concrete is increased, and the method has important significance for high-value comprehensive utilization of solid waste in bulk industry.
Drawings
FIG. 1 is an SEM morphological characteristic diagram of a coal gasification ash raw material in the invention;
FIG. 2 is a graph showing particle size distribution of portland cement and gasified ash powder in the present invention, wherein FIG. (a) is a graph showing particle size distribution of portland cement and FIG. (b) is a graph showing particle size distribution of gasified ash powder;
FIG. 3 is an SEM image of a 28 day cured coal gasification ash concrete sample.
Detailed Description
The invention provides a high-toughness coal gasification ash concrete gel material, which comprises the following raw materials in percentage by mass: 256-405 parts of cement, 32-90 parts of coal gasification ash powder, 720-762 parts of sand, 1081-1144 parts of stone, 3.2-4.2 parts of water reducer and 165-170 parts of water.
In some embodiments, the high toughness coal gasification ash concrete gel material comprises the following raw materials in mass fraction: 288-340 parts of cement, 50-75 parts of coal gasification ash powder, 740-755 parts of sand, 1081-1125 parts of stone, 3.2-3.6 parts of water reducer and 165-168 parts of water.
In some embodiments, the high toughness coal gasification ash concrete gel material comprises the following raw materials in mass fraction: 288 parts of cement, 72 parts of coal gasification ash slag powder, 750 parts of sand, 1125 parts of stone, 3.6 parts of water reducer and 165 parts of water.
In the invention, the mixing amount of the coal gasification ash is the ratio of the mass parts of the coal gasification ash to the total mass parts of the coal gasification ash and the cement. With the increase of the mixing amount of coal gasification ash slag, the mechanical property of the concrete is firstly increased and then reduced, and when the mixing amount of coal gasification ash slag powder is 20%, the mechanical property of the obtained concrete is the best.
In some embodiments, the gel material comprises 19.9% -23.3% of SiO by mass 2 7.5 to 9.1 percent of Al 2 O 3 53.9% -60.6% CaO, more preferably 19.9% -21.6% SiO 2 7.5% -8.3% of Al 2 O 3 57.2% -60.6% of CaO. In the present invention, siO 2 、Al 2 O 3 The total amount of CaO is gradually increased along with the increase of the mixing amount of coal gasification ash, so that more sufficient and more accurate oxide proportion is provided for the hydration reaction and the secondary hydration reaction of the gel material.
In some embodiments, the method of preparing the coal gasification ash powder comprises: drying coal gasification ash slag, grinding and sieving to obtain coal gasification ash slag powder; the screening is a square hole screen with the aperture of 0.15 mm.
In the invention, iron microbeads, quartz phase and calcite in coal gasification ash are wrapped by amorphous aluminosilicate, and chemical reaction and gelation activity are low as shown in figure 1, so that mechanical grinding and crushing are adopted to enhance pozzolanicity and specific surface area of coal gasification ash, and then large-particle inert substances are removed through a square sieve with 0.15 mm.
The particle size distribution of the two substances is similar when the particle size distribution of the two substances reaches 10% and 50%, respectively 2.6 μm and 13.6 μm-15.6 μm, and the particle size distribution of the cement and the coal gasification ash powder is similar when the particle size distribution reaches 90%, which can reach 40.0 μm and 49.6 μm, as shown in fig. 2 and table 1. It can be seen that the particle size distribution of the gasified ash powder is comparable to that of cement, and the particle size distribution is not quite different at the same number level. Therefore, the particle size distribution of the gasified ash powder should be equivalent to that of cement, and the mass ratio of particles having a particle diameter of less than 50 μm is 90% or more. The equivalent particle diameters of the cement and the gasified ash powder are shown in table 1, and the chemical composition of the portland cement and the gasified ash are shown in table 2.
TABLE 1 equivalent particle size of Cement and coal gasification ash powder
TABLE 2 chemical composition of cement and coal gasification ash
The main chemical components of the gasified ash are the same as those of cement, thus providing possibility for replacing cement with gasified ash. The total amount of the four oxides of silicon dioxide, aluminum oxide, ferric oxide and calcium oxide accounts for more than 90 percent in the clinker, and provides sufficient oxides for hydration reaction and secondary hydration reaction of gel materials. Wherein loss on ignition LOI, cement is 2.5%, coal gasification ash is 4.3%.
In some embodiments, the cement is a 42.5 strength grade portland cement.
In some embodiments, the sand is yellow sand, each having a particle size of less than 4.75mm, and a bulk density of 1450m 3 。
In some embodiments, the pebbles are continuous graded pebbles having a particle size in the range of 5 to 25 mm.
In some embodiments, the water reducing agent is a polycarboxylate superplasticizer.
The invention also provides a preparation method of the high-toughness coal gasification ash concrete gel material, which comprises the following steps:
mixing cement, coal gasification ash slag powder, sand and stones to obtain a mixture;
and mixing the water reducer with water, adding the obtained mixture into the mixture, stirring and molding to obtain the high-toughness coal gasification ash concrete gel material.
The invention firstly mixes cement, coal gasification ash slag powder, sand and stones to obtain a mixture. The invention preferably mixes cement, coal gasification ash, sand and stone in a stirrer, and the rotation speed of the stirrer is not particularly limited, so that the materials can be uniformly mixed.
After the mixture is obtained, the water reducing agent and water are mixed, all the mixture is added into the mixture, and the mixture is stirred and formed to obtain the coal gasification doped ash concrete. The process of mixing the water reducer and water is not particularly limited, and materials can be uniformly mixed according to the process well known in the art.
In the invention, after the mixture of the water reducing agent and water is added to the mixture, the stirring time is preferably 120 to 150 seconds, more preferably 130 to 140 seconds. The stirring rate of the present invention is not particularly limited, and the materials can be uniformly mixed according to a process well known in the art.
In the present invention, the molding is preferably vibration molding using a vibrating table. The concrete process of the vibration is not particularly limited in the present invention, and the material may be compacted to obtain concrete according to a process well known in the art.
For a better understanding of the present invention, the following examples are further illustrated, but are not limited to the following examples.
In the following examples, concrete strength grades C30, C40 and C50 are taken as examples, cement is ordinary Portland cement with strength grade of 42.5, sand is yellow sand, the grain size is less than 4.75mm, and the bulk density is 1450m 3 The method comprises the steps of carrying out a first treatment on the surface of the The cobble is continuous graded gravels with the particle size of 5-25 mm; the particle size of the gasified ash is less than 0.15mm; the water reducer is a polycarboxylic acid high-efficiency water reducer; the water is tap water.
The main chemical compositions of the gel materials in the following examples are shown in Table 2.
Example 1
The strength grade of the concrete is 30MPa, and the mixing ratio is as follows: 288kg of cement; 32kg of coal gasification ash powder; 762kg of sand; 1144kg of cobble; 3.2kg of water reducer; 170kg of water.
The preparation method comprises the following steps: placing cement, coal gasification ash slag powder, sand and stones in a stirrer, and uniformly mixing to obtain a mixture;
and mixing the water reducer with water, adding the obtained mixture into the mixture, stirring for 150s, and vibrating and shaping by a vibrating table to obtain the high-toughness coal gasification ash concrete gel material.
Example 2
The strength grade of the concrete is 30MPa, and the mixing ratio is as follows: 256kg of cement; 64kg of coal gasification ash powder; 762kg of sand; 1144kg of cobble; 3.2kg of water reducer; 170kg of water.
The preparation method is the same as in example 1.
Comparative example 1
The strength grade of the concrete is 30MPa, and the mixing ratio is as follows: 224kg of cement; 96kg of coal gasification ash powder; 762kg of sand; 1144kg of cobble; 3.2kg of water reducer; 170kg of water.
The preparation method is the same as in example 1.
Comparative example 2
The strength grade of the concrete is 30MPa, and the mixing ratio is as follows: 320kg of cement; 762kg of sand; 1144kg of cobble; 3.2kg of water reducer; 170kg of water.
The preparation method is the same as in example 1.
Example 3
The strength grade of the concrete is 40MPa, and the mixing ratio is: 324kg of cement; 36kg of coal gasification ash powder; 750kg of sand; 1125kg of cobble; 3.6kg of water reducer; 165kg of water.
The preparation method is the same as in example 1.
Example 4
The strength grade of the concrete is 40MPa, and the mixing ratio is: 288kg of cement; 72kg of coal gasification ash powder; 750kg of sand; 1125kg of cobble; 3.6kg of water reducer; 165kg of water.
The preparation method is the same as in example 1.
Comparative example 3
The strength grade of the concrete is 40MPa, and the mixing ratio is: 252kg of cement; 108kg of coal gasification ash powder; 750kg of sand; 1125kg of cobble; 3.6kg of water reducer; 165kg of water.
The preparation method is the same as in example 1.
Comparative example 4
The strength grade of the concrete is 40MPa, and the mixing ratio is: 360kg of cement; 750kg of sand; 1125kg of cobble; 3.6kg of water reducer; 165kg of water.
The preparation method is the same as in example 1.
Example 5
The strength grade of the concrete is 50MPa, and the mixing ratio is as follows: 405kg of cement; 45kg of coal gasification ash powder; 720kg of sand; 1081kg of stones; 4.2kg of water reducer; 170kg of water.
The preparation method is the same as in example 1.
Example 6
The strength grade of the concrete is 50MPa, and the mixing ratio is as follows: 360kg of cement; 90kg of coal gasification ash powder; 720kg of sand; 1081kg of stones; 4.2kg of water reducer; 170kg of water.
The preparation method is the same as in example 1.
Comparative example 5
The strength grade of the concrete is 50MPa, and the mixing ratio is as follows: 315kg of cement; 135kg of coal gasification ash powder; 720kg of sand; 1081kg of stones; 4.2kg of water reducer; 170kg of water.
The preparation method is the same as in example 1.
Comparative example 6
The strength grade of the concrete is 50MPa, and the mixing ratio is as follows: 450kg of cement; 720kg of sand; 1081kg of stones; 4.2kg of water reducer; 170kg of water.
The preparation method is the same as in example 1.
The 28-day compressive strength, flexural strength and splitting tensile strength of the concrete prepared in examples 1 to 6 and comparative examples 1 to 6 were tested according to the general concrete mix design rule (JGJ 55-2011) and the concrete physical and mechanical property test method Standard (GB/T50081-2019). When the strength is measured, the loading speed is 0.02 MPa/s, the loading is continuously carried out, the number of concrete test samples is 3, and the error control range is +/-15%. The concrete test data results of the coal gasification ash concrete after test loading are shown in table 3.
TABLE 3 compressive strength, flexural Strength and split tensile test results for examples 1-3
As can be seen from table 3, when the blending amount (i.e., the blending amount of the coal gasification ash slag powder, the blending amount of the coal gasification ash slag powder=the coal gasification ash slag powder/(the coal gasification ash slag powder+cement)) was 0 (comparative examples 2, 4, 6), the concrete compressive strengths were 31.86 MPa, 41.7 MPa, and 51.68 MPa, respectively. The compressive strength of the concrete at the mixing amount of 10% (examples 1, 3 and 5) was 33.45 MPa, 44.6 MPa and 54.62 MPa, respectively, which were improved by 4.9%, 6.9% and 5.7% compared with the case of not using coal gasification ash. The compressive strength of the concrete at 20% (examples 2, 4 and 6) was 34.57 MPa, 45.20 MPa and 55.78 MPa, respectively, which were 8.5%, 8.4% and 7.9% higher than those of the concrete without coal gasification ash. The compressive strengths of the concrete at the mixing amount of 30% (comparative examples 1, 3 and 5) were 29.06 MPa, 37.1 MPa and 49.71 MPa, respectively, which were reduced by 8.8%, 11.0% and 9.0% compared with the case of not using coal gasification ash. The mixing amount of the coal gasification ash in the concrete is not more than 20%, and the compressive strength is higher as the mixing amount is more; the mixing amount exceeds 30%, and the strength is reduced more.
As can be seen from Table 3, when the mixing amount is 0 (comparative examples 2, 4 and 6), the flexural strength of the concrete is 4.10 MPa, 4.80 MPa and 5.40 MPa, respectively; the flexural strength of the concrete with the mixing amount of 10% (examples 1, 3 and 5) is 5.50 MPa, 5.90 MPa and 7.07 MPa respectively, which are improved by 34.1%, 22.9% and 30.9% compared with the case of not using coal gasification ash. The flexural strength of the concrete with the mixing amount of 20% (examples 2, 4 and 6) is respectively 4.60 MPa, 5.00 MPa and 5.67 MPa, which are improved by 12.2%, 4.2% and 5.0% compared with the case of not using coal gasification ash. The flexural strength of the concrete at the mixing amount of 30% (comparative examples 1, 3 and 5) was 3.90 MPa, 4.80 MPa and 4.62 MPa, respectively, which were reduced by 4.9%, 0.0% and 34.6% compared with the case of not using coal gasification ash. From comprehensive comparison analysis, the mixing amount of coal gasification ash in the concrete is not more than 20%, the flexural strength can be obviously improved, and the smaller the mixing amount is, the larger the flexural strength is; the mixing amount exceeds 30%, and the strength is reduced.
As can be seen from Table 3, at the doping amount of 0 (comparative examples 2, 4, 6), the split tensile strength of the concrete was 2.5 MPa, 3.1 MPa and 3.7 MPa, respectively; when the mixing amount is 10 percent (examples 1, 3 and 5), the splitting tensile strength of the concrete is 2.60 MPa, 3.30 MPa and 3.8 MPa respectively, and the splitting tensile strength is also improved by 4.0 percent, 6.4 percent and 2.7 percent compared with the splitting tensile strength when coal gasification ash is not used. When the mixing amount is 20% (examples 2, 4 and 6), the splitting tensile strength of the concrete is 2.80 MPa, 3.40 MPa and 4.0 MPa respectively, and the splitting tensile strength is improved by 12%, 9.7% and 8.1% compared with that of the concrete without coal gasification ash. When the mixing amount is 30% (comparative examples 1, 3 and 5), the splitting tensile strength of the concrete is 2.40 MPa, 2.80 MPa and 3.5 MPa respectively, and the splitting tensile strength is reduced by 4.0%, 9.7% and 5.4% compared with that of the concrete without coal gasification ash. From comprehensive comparison analysis, the mixing amount of coal gasification ash in the concrete is not more than 20%, the splitting tensile strength is obviously improved, and the more the mixing amount is, the greater the splitting strength is; the mixing amount exceeds 30%, and the strength is slightly reduced.
SEM images of 28-day cured coal ash concrete samples are shown in fig. 3. The hydration product is coated on the surface of cement, and part of the area is provided with obvious pits, so that the density of the gel and the cement is loose, and the hydration product is Ca (OH) 2 Is less than the amount of cement and aggregate that is not fully intimately coated and has a small amount of ettringite present. Along with the increase of the mixing amount of the coal gasification ash, the mixing amount of the coal gasification ash improves the pore structure in the concrete, the number of cavities is reduced, the combination between gel and the coal gasification ash is more compact, needle-shaped crystals of ettringite penetrate through the surface of the concrete, and the extra gel fills gaps to enable the microstructure to be more compact, so that the strength of the concrete is greatly improved. The 30% coal gasification ash formed less concrete gel and the formation of microcracks affected the strength. Thus, from microscopic studies it can also be concluded that 20% of the gasThe converted ash can be used as a partial substitute for cement in concrete.
The compressive strength, the fracture resistance and the splitting tensile strength of the coal gasification ash concrete are improved in a comprehensive view, wherein the fracture resistance and the splitting tensile strength are most obviously improved. The main reason is that coal gasification ash has volcanic ash activity and SiO 2 The content of the equal active substances is increased, and more gel materials are generated by carrying out secondary hydration reaction through volcanic ash reaction, so that the structural compactness of the concrete can be further improved, and the strength is increased.
In summary, the components of examples 1-6 are mixed in the optimal ratio at present, and the prepared coal gasification ash concrete is prepared by activating coal gasification ash powder after drying, grinding and screening, so that the cement consumption is reduced, the solid waste storage amount of coal gasification ash is consumed, the concrete cost is obviously reduced, the concrete strength, particularly the flexural strength and tensile strength are improved, the high-toughness coal gasification ash concrete is obtained, and the improvement of the Cheng Kanglie capacity of the concrete is facilitated.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The high-toughness coal gasification ash concrete gel material is characterized by comprising the following raw materials in percentage by mass: 256-405 parts of cement, 32-90 parts of coal gasification ash powder, 720-762 parts of sand, 1081-1144 parts of stone, 3.2-4.2 parts of water reducer and 165-170 parts of water.
2. The high-toughness coal gasification ash concrete gel material according to claim 1, which is characterized by comprising the following raw materials in mass percent: 288 parts of cement, 72 parts of coal gasification ash slag powder, 750 parts of sand, 1125 parts of stone, 3.6 parts of water reducer and 165 parts of water.
3. A high toughness gas according to claim 1 or 2The clinker concrete gel material is characterized by comprising 19.9-23.3% of SiO by mass percent 2 7.5 to 9.1 percent of Al 2 O 3 53.9% -60.6% of CaO.
4. The high-toughness coal gasification ash concrete gel material according to claim 1, wherein the preparation method of the coal gasification ash powder comprises the following steps: drying coal gasification ash slag, grinding and sieving to obtain coal gasification ash slag powder; the screening is a square hole screen with the aperture of 0.15 mm.
5. The high-toughness coal gasification ash concrete gel material according to claim 1 or 2, wherein the mass ratio of particles with the particle size smaller than 50 μm in the coal gasification ash powder is more than 90%.
6. The high toughness coal gasification ash concrete gel material according to claim 1, wherein the cement is a 42.5 strength grade portland cement.
7. The high toughness coal gasification ash concrete gel material according to claim 1, wherein the sand is yellow sand with particle size less than 4.75mm and bulk density of 1450m 3 。
8. The high-toughness coal gasification ash concrete gel material according to claim 1, wherein the cobble is continuous graded crushed stone with a particle size in a range of 5-25 mm.
9. The high toughness coal gasification ash concrete gel material according to claim 1, wherein the water reducing agent is a polycarboxylic acid high efficiency water reducing agent.
10. The method for preparing the high-toughness coal gasification ash concrete gel material according to any one of claims 1 to 9, which is characterized by comprising the following steps:
mixing cement, coal gasification ash slag powder, sand and stones to obtain a mixture;
and mixing the water reducer with water, adding the obtained mixture into the mixture, stirring and molding to obtain the high-toughness coal gasification ash concrete gel material.
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