CN114685069A - Sulfate-excited fly ash cementing material and preparation method and application thereof - Google Patents
Sulfate-excited fly ash cementing material and preparation method and application thereof Download PDFInfo
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- CN114685069A CN114685069A CN202210458963.0A CN202210458963A CN114685069A CN 114685069 A CN114685069 A CN 114685069A CN 202210458963 A CN202210458963 A CN 202210458963A CN 114685069 A CN114685069 A CN 114685069A
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- 239000010881 fly ash Substances 0.000 title claims abstract description 103
- 239000000463 material Substances 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title abstract description 15
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 73
- 239000002893 slag Substances 0.000 claims abstract description 33
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 30
- 239000004568 cement Substances 0.000 claims abstract description 25
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical group [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 13
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 13
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 12
- 239000004567 concrete Substances 0.000 claims description 11
- 238000012360 testing method Methods 0.000 claims description 10
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 7
- 239000000292 calcium oxide Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 229910021653 sulphate ion Inorganic materials 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 18
- 239000007788 liquid Substances 0.000 abstract description 10
- 239000002131 composite material Substances 0.000 abstract description 6
- 239000012190 activator Substances 0.000 abstract description 4
- 239000003795 chemical substances by application Substances 0.000 description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000004576 sand Substances 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 5
- 230000004913 activation Effects 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 238000005303 weighing Methods 0.000 description 5
- 239000003513 alkali Substances 0.000 description 4
- 230000005284 excitation Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 4
- 239000002956 ash Substances 0.000 description 3
- 239000011083 cement mortar Substances 0.000 description 3
- -1 compound sulfate Chemical class 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000004115 Sodium Silicate Substances 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 239000004480 active ingredient Substances 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229910001653 ettringite Inorganic materials 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000019353 potassium silicate Nutrition 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910052911 sodium silicate Inorganic materials 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910001860 alkaline earth metal hydroxide Inorganic materials 0.000 description 1
- 239000012670 alkaline solution Substances 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
- 238000000498 ball milling Methods 0.000 description 1
- RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical compound [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 description 1
- 229910001863 barium hydroxide Inorganic materials 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 231100000481 chemical toxicant Toxicity 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 208000023504 respiratory system disease Diseases 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- UUCCCPNEFXQJEL-UHFFFAOYSA-L strontium dihydroxide Chemical compound [OH-].[OH-].[Sr+2] UUCCCPNEFXQJEL-UHFFFAOYSA-L 0.000 description 1
- 229910001866 strontium hydroxide Inorganic materials 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 239000003440 toxic substance Substances 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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
-
- 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
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/21—Mixtures thereof with other inorganic cementitious materials or other activators with calcium sulfate containing activators
-
- 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
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
-
- 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)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a sulfate-excited fly ash cementing material, and a preparation method and application thereof, and solves the technical problems that in the prior art, a single sulfate activator is often adopted to activate fly ash, the activity of the fly ash cannot be fully excited, the activity effect of the fly ash is not obvious, and the cement consumption is high. It comprises 40-80% of fly ash, 6-30% of sulfate excitant and 10-30% of slag; the sulfate excitant is a sodium sulfate and calcium sulfate composite excitant. The invention uses the sulfate excitant, compared with the liquid excitant, the transportation is convenient, and the use is convenient; the dosage of cement and clinker is reduced.
Description
Technical Field
The invention relates to the technical field of comprehensive utilization of fly ash, in particular to a preparation method and application of a sulfate-excited fly ash cementing material.
Background
The potential pozzolanic activity of the fly ash is the main reason of the fly ash as a building material resource, but the potential pozzolanic activity of the fly ash needs to be stimulated to play the role. The method for activating the fly ash activity roughly comprises alkali activation, acid activation and salt activation, and sulfate activation is the most common method and the better method in the salt activation.
In the existing preparation method of the alkali-activated fly ash cementing material, a liquid alkali activator is usually utilized to activate active ingredients in fly ash to prepare the cementing material. The method uses liquid excitant, is inconvenient in transportation and use, has too fast liquid-solid reaction and short actual operation time in engineering application.
Most of fly ash in China is low-calcium ash, the CaO content is generally below 10%, and the CaO content is too low compared with cement clinker and natural volcanic ash. If the sulfate and the fly ash are mixed and added with water separately, along with the increase of the sulfate, multiple tests show that the mixture cannot be coagulated within 28 days or even longer, so that the activity effect of the sulfate on the fly ash is not obvious, the activity of the fly ash can be fully excited only under the condition of excitation of the composite sulfate, the composite sulfate excitant promotes the activity excitation of the fly ash, the fly ash is hydrated to generate CSH and ettringite crystals, and the fly ash is continuously grown and perfected, so that the strength of system slurry is continuously increased.
Disclosure of Invention
The invention aims to provide a sulfate-excited fly ash cementing material, and a preparation method and application thereof, and aims to solve the technical problems that the early activity of fly ash cannot be fully excited by activating the fly ash with a single sulfate excitant in the prior art, so that the strength of the fly ash cementing material cannot meet the engineering use requirement, and the cement consumption is large.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a sulfate-excited fly ash cementing material which comprises the following chemical components in percentage by weight: 40-80% of fly ash, 6-30% of sulfate excitant and 10-30% of slag;
the sulfate excitant is a compound excitant of sodium sulfate and calcium sulfate.
Alternatively or preferably, the specific surface area of the fly ash is 300-500m2And/kg, wherein the content of calcium oxide in the fly ash is 3% -10%.
Alternatively or preferably, the specific surface area of the slag is 300-500m2/kg。
Optionally or preferably, the calcium sulfate has a density of 2-3g/cm3Specific surface area of 100-300m2/kg。
Optionally or preferably, the weight ratio of the fly ash, the sulfate excitant, the slag and the cement is as follows: fly ash: sulfate excitant: slag: 40-80 parts of cement: 6-30: 10-30: 20-50.
Optionally or preferably, the weight percentage of the fly ash and the sulfate excitant is 28.5% -37%: 4% -7%, sodium sulfate in the sulfate excitant: the mass ratio of the two chemical components of calcium sulfate is 1: 3 to 2: 5.
optionally or preferably, the weight ratio of the fly ash to the sulfate excitant is: fly ash: sulfate excitant 100: 13.64.
The invention provides a preparation method of a sulfate-excited fly ash cementing material, which comprises the following steps:
s1, preparing a sulfate excitant;
s3 stirring the sulfate-excited fly ash cementing material, placing fly ash, a sulfate excitant and slag in a mixing cylinder according to a proportion for mixing, adding water and cement or clinker through a stirrer for stirring, and forming a cementing material by exciting the sulfate excitant at normal temperature;
and S4, testing the sulfate-excited fly ash cementing material, and detecting the technical performance index of the sulfate-excited fly ash cementing material.
The invention provides an application of a sulfate-excited fly ash cementing material in concrete.
Based on the technical scheme, the embodiment of the invention can at least produce the following technical effects:
(1) according to the sulfate-excited fly ash cementing material and the preparation method and application thereof, the compound sulfate excitant is used, firstly, most of the commonly used excitants are liquid excitants, and the sulfate excitant is solid, so that the transportation and the storage are convenient and the use is convenient and fast compared with the liquid excitants; secondly, one of the sulfate excitants is industrial solid waste, and the use of the sulfate excitant is increased, so that the disposal cost can be reduced; finally, compared with the common cementing material, the sulfate-excited fly ash cementing material can directly reduce the dosage of cement and clinker by 50 percent.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a sulfate-excited fly ash cementing material which comprises the following chemical components in percentage by weight: 40-80% of fly ash, 6-30% of sulfate excitant and 10-30% of slag;
the sulfate excitant is a compound excitant of sodium sulfate and calcium sulfate.
The fly ash is fine ash collected from flue gas generated after coal combustion, and is main solid waste discharged from a coal-fired power plant. The main oxide composition of the fly ash of the Chinese thermal power plant is as follows: SiO 22、Al2O3、FeO、Fe2O3、CaO、TiO2And the like. A large amount of fly ash is not treated, and then flying dust is generated to pollute the atmosphere; if the fly ash is discharged into a water system, river congestion can be caused, toxic chemical substances in the fly ash can cause harm to human bodies and organisms, and the fly ash can be recycled, such as being used as an admixture of concrete.
The slag is the residue of ore after mineral processing or smelting, and the slag plays an important role in industrial production and is made into slag cement, slag micro powder, slag portland cement, slag wool, blast furnace slag, granulated blast furnace slag powder, copper slag and slag vertical mill. If the slag is not treated, the air is polluted to a certain extent, and the mine workers are easy to cause respiratory diseases by the slag for many years. As an alternative embodiment, the specific surface area of the fly ash is 300-500m2And/kg, wherein the content of calcium oxide in the fly ash is 3% -10%.
As an optional implementation mode, the specific surface area of the slag is 300-500m2/kg。
As an alternative embodiment, the calcium sulfate has a density of 2 to 3g/cm3Specific surface area of 100-300m2/kg。
As an alternative embodiment, the weight ratio of the fly ash, the sulfate excitant, the slag and the cement is as follows: fly ash: sulfate excitant: slag: 40-80 parts of cement: 6-30: 10-30: 20-50.
As an optional embodiment, the weight percentage of the fly ash and the sulfate excitant is 28.5% -37%: 4% -7%, sodium sulfate in the sulfate excitant: the mass ratio of the two chemical components of calcium sulfate is 1: 3 to 2: 5.
through the efforts of developers, the best excitation effect is found when the ratio of the two exciting agents is between 3:10 and 5:10, and the 28-day compressive strength value is relatively close to the 28-day compressive strength value of a cement reference group, so that the optimal ratio of the two exciting agents is 30-50%, and the optimal dosage of the exciting agent in the cementing material is 4.5-6.5%.
As an optional embodiment, the weight ratio of the fly ash to the sulfate excitant is: fly ash: sulfate excitant 100: 13.64.
the inventors of the present application have found through extensive research that when the weight ratio of the fly ash to the solid activator is within the above range, the obtained cement has the best performance.
The invention provides a preparation method of a sulfate-excited fly ash cementing material, which comprises the following steps:
s1, preparing a sulfate excitant;
s3 stirring the sulfate-excited fly ash cementing material, placing fly ash, a sulfate excitant and slag in a mixing cylinder according to a proportion for mixing, adding water and cement or clinker through a stirrer for stirring, and forming a cementing material by exciting the sulfate excitant at normal temperature;
and S4, testing the sulfate-excited fly ash cementing material, and detecting the technical performance index of the sulfate-excited fly ash cementing material.
The invention provides an application of a sulfate-excited fly ash cementing material in concrete.
This application sets up 20 sets of examples, of which examples 1-8 are single addition sulphate boosters, examples 9-20 are combined addition sulphate boosters with two chemical components, and blank examples 1-3 are three blank controls without any component added. Wherein the weight ratio of the sulfate excitant, the slag and the fly ash in each group of examples and blank examples is shown in Table 1, and the total weight of the mixed material is 225 g:
TABLE 1 weight ratio of the specific examples
Wherein, as in example 1, the addition amount of the sulfate excitant is 3/(3+5+42) × 225 g-13.5 g, the addition amount of the slag is calculated as 22.5g according to the same method, and the addition amount of the fly ash is calculated as 189g according to the same method;
in example 9, sodium sulfate: calcium sulfate 1: 3, the mass of the sodium sulfate is 1/(1+3+9+37) × 225g ═ 4.5g, the addition of the calcium sulfate is 13.5g according to the same method, the addition of the slag is 40.5g according to the same method, and the addition of the fly ash is 166.5g according to the same method;
examples 1-8 the specific preparation of the sulfate salt booster of examples 1-8 described in table 1 is as follows:
raw materials: the sulfate is selected from any one of sodium sulfate and calcium sulfate;
the preparation method comprises the following steps:
(1) 3 to 11 percent of sulfate excitant is taken;
(2) respectively weighing 5-15% of slag, 24-42% of fly ash, 225g of water, 225g of cement and 1350g of standard sand into a mortar stirrer, and fully mixing to obtain a cement mortar material;
(3) and (3) transferring the formed product to a curing box, curing for 24 hours at the humidity of more than 90% and the temperature of 20 ℃ to obtain a formed sulfate-excited gelled material sample, demolding, and curing in water until the performance is tested.
Examples 5 to 20
The specific preparation method of the sulfate excitant as the composite excitant in the examples 5 to 20 in the table 1 is as follows:
raw materials: the proportion of the sulfate excitant is sodium sulfate: calcium sulfate;
the specific implementation method of the preparation method comprises the following steps:
(1) taking the ratio of 1: 3 to 2: 11, mixing the sulfates to prepare an excitant;
(2) placing the fly ash and the slag into a ball mill for ball milling to obtain the required specific surface area (independent milling: milling each raw material independently to 300-2(iv) kg; semi-mixing grinding, wherein each raw material is ground separately and then mixed and ground for 10min, and the specific surface area of the obtained mixed powder is about 300-500m2Per kg; fully mixing and grinding, each raw material is mixed and ground to the specific surface area of about 300-2/kg；
(3) Respectively weighing 4-13% of the exciting agent prepared in the step (1), 5-15% of mineral powder, 24-42% of fly ash, 225g of water, 225g of cement and 1350g of standard sand into a mortar stirrer, and fully mixing to obtain a cement mortar material;
(4) and (3) transferring the formed product to a curing box, curing for 24 hours at the humidity of more than 90% and the temperature of 20 ℃ to obtain a formed sulfate-excited gelled material sample, demolding, and curing in water until the performance is tested.
Blank examples 1 to 3
The sulfate excitant is not added in the blank examples 1-3 in the table 1, and more specifically:
blank 1: respectively weighing 50% of fly ash, 225g of water, 225g of cement and 1350g of standard sand;
blank 2: respectively weighing 50% of slag, 225g of water, 225g of cement and 1350g of standard sand;
blank 3: respectively weighing 225g of water, 450g of cement and 1350g of standard sand;
the specific implementation method of the preparation method comprises the following steps:
putting the materials into a stirrer, and fully mixing to obtain a cement mortar material; and (3) transferring the formed product to a curing box, curing for 24 hours at the humidity of more than 90% and the temperature of 20 ℃ to obtain a formed sulfate-excited gelled material sample, demolding, and curing in water until the performance is tested.
Product applied to strength test of concrete
The standard mortar was prepared using the sulfate-activated fly ash cement prepared in examples 1 to 20 and blank examples 1 to 3 and standard sand, and the prepared standard mortar was cured for 3 days, 7 days, and 28 days, respectively, and the cured concrete was tested for strength for 3 days, 7 days, and 28 days.
Test standards: the method is based on the strength test method of the concrete in the national standard GB/T50081 of the test method standard for mechanical properties of common concrete.
And (3) test results: the results of the 3 day, 7 day and 28 day compressive strength tests obtained for examples 1-20 and blanks 1-3 are shown in Table 2:
TABLE 2 test results of examples 1-20 and blanks 1-3
As shown in tables 1 and 2, the strength of the concrete in the blank example without adding the single fly ash cementing material of the exciting agent can not meet the engineering construction requirement, particularly the 28-day strength is only 27.4MPa, and can not meet the strength requirement of the C40 concrete. When the calcium sulfate of examples 1-4 is used as an exciting agent, the strength of the cementing material is gradually reduced along with the increase of the adding amount, and when the sodium sulfate of examples 5-8 is used as an exciting agent, the strength of the cementing material reaches the maximum when the adding amount is 3% -6%, and the strength requirement of the C40 concrete is met. The exciting effect is best when the ratio of the two exciting agents is between 3:10 and 5:10, and the 28-day compressive strength value is relatively close to the 28-day compressive strength value of a cement reference group, so that the optimal ratio of the two exciting agents is 30-50%, the optimal dosage of the exciting agent in the cementing material is 4.5-6.5%, and the dosage of the compound sulfate exciting agent is less than that of single sodium sulfate as the exciting agent.
According to the sulfate-excited fly ash cementing material and the preparation method and application thereof, the compound sulfate excitant is used, firstly, most of the commonly used excitants are liquid excitants, and the sulfate excitant is solid, so that the transportation and the storage are convenient and the use is convenient and fast compared with the liquid excitants; secondly, one of the sulfate excitants is industrial solid waste, and the use of the sulfate excitant is increased, so that the disposal cost can be reduced; finally, compared with the common cementing material, the sulfate-excited fly ash cementing material can directly reduce the dosage of cement and clinker by 50 percent.
If the sulfate and the fly ash are mixed and added with water, along with the increase of the sulfate, multiple tests show that the mixture cannot be coagulated in 28 days or even longer, so that the activity effect of the fly ash excited by the sulfate alone is not obvious, the activity of the fly ash can be fully excited under the condition of excitation of the composite sulfate, the composite sulfate excitant prompts the activity of the fly ash to be excited, CSH and ettringite crystals are generated by hydration, the fly ash grows and is perfect, and the strength of the system slurry is increased continuously.
The liquid excitant comprises water glass and hydroxide alkaline solution, and the sodium silicate is colorless and transparent viscous solid. The sodium silicate is prepared by calcining quartz sand and sodium carbonate; the transparent slurry solution is called water glass when dissolved in water to be alkaline; hydroxide refers to an inorganic compound formed by a metal cation or an ammonium ion and a hydroxide radical (-OH), also called a base, and is a hydroxide of a metal element (including ammonium). The main use of the hydroxide is easy to dissolve in water, and the most of the easy-to-dissolve alkali metal and alkaline earth metal hydroxides are strong bases, such as sodium hydroxide NaOH, potassium hydroxide KOH, barium hydroxide, lithium hydroxide LiOH, strontium hydroxide and the like.
And (3) exciting active ingredients in the fly ash by using a liquid alkali activator to prepare the cementing material. However, the liquid excitant has the defects of inconvenience in the transportation and use processes, too fast liquid-solid reaction speed and short actual operation time in engineering application.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. The sulfate-excited fly ash cementing material is characterized by comprising the following chemical components in percentage by weight: 40-80% of fly ash, 6-30% of sulfate excitant and 10-30% of slag;
the sulfate excitant is a compound excitant of sodium sulfate and calcium sulfate.
2. The sulfate-activated fly ash cementitious material of claim 1, wherein: the specific surface area of the fly ash is 300-500m 2 And/kg, wherein the content of calcium oxide in the fly ash is 3% -10%.
3. The sulfate-activated fly ash cementitious material of claim 1The method is characterized in that: the specific surface area of the slag is 300-500m 2 /kg。
4. The sulfate-activated fly ash cementitious material of claim 1, wherein: the density of the calcium sulfate is 2-3g/cm3Specific surface area of 100-300m 2 /kg。
5. The sulfate-activated fly ash cementitious material of claim 1, wherein: the weight ratio of the fly ash, the sulfate excitant, the slag and the cement is as follows: fly ash: sulfate excitant: slag: cement = 40-80: 6-30: 10-30: 20-50.
6. The sulfate-activated fly ash cementitious material of claim 1, wherein: the weight percentage of the fly ash and the sulfate excitant is 28.5-37%: 4% -7%, sodium sulfate in the sulfate excitant: the mass ratio of calcium sulfate is 1: 3 to 2: 5.
7. the sulfate-activated fly ash cementitious material of claim 1, wherein: the weight ratio of the fly ash to the sulfate excitant is as follows: fly ash: sulfate excitant 100: 13.64.
8. the method for preparing the sulfate-activated fly ash binding material according to claim 1, comprising the following steps:
s1, preparing a sulfate excitant;
s3 stirring the sulfate-excited fly ash cementing material, placing fly ash, a sulfate excitant and slag in a mixing cylinder according to a proportion for mixing, adding water and cement or clinker through a stirrer for stirring, and forming a cementing material by exciting the sulfate excitant at normal temperature;
and S4, testing the sulfate-excited fly ash cementing material, and detecting the technical performance index of the sulfate-excited fly ash cementing material.
9. Use of a sulphate-activated fly ash cementitious material according to claim 1 in concrete.
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