CN113307595A - Multi-element solid waste synergy-based geopolymer cementing material for pavement base and preparation method thereof - Google Patents
Multi-element solid waste synergy-based geopolymer cementing material for pavement base and preparation method thereof Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 53
- 229920000876 geopolymer Polymers 0.000 title claims abstract description 25
- 239000002910 solid waste Substances 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000002893 slag Substances 0.000 claims abstract description 40
- 239000010881 fly ash Substances 0.000 claims abstract description 32
- 238000002156 mixing Methods 0.000 claims abstract description 22
- 239000010440 gypsum Substances 0.000 claims abstract description 19
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 19
- 238000001035 drying Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000000227 grinding Methods 0.000 claims abstract description 4
- 239000002585 base Substances 0.000 claims description 48
- 239000000203 mixture Substances 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 12
- 239000012190 activator Substances 0.000 claims description 10
- 239000003513 alkali Substances 0.000 claims description 9
- 238000000498 ball milling Methods 0.000 claims description 8
- 239000011413 geopolymer cement Substances 0.000 claims description 5
- 229920003041 geopolymer cement Polymers 0.000 claims description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 4
- 239000011363 dried mixture Substances 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 3
- 239000007832 Na2SO4 Substances 0.000 claims description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 2
- 239000004568 cement Substances 0.000 abstract description 21
- 230000000087 stabilizing effect Effects 0.000 abstract description 6
- 238000011161 development Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000002787 reinforcement Effects 0.000 abstract 1
- 239000002699 waste material Substances 0.000 abstract 1
- 239000004575 stone Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 239000011575 calcium Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000010426 asphalt Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000000378 calcium silicate Substances 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- NBWKWDNEHWZRMZ-UHFFFAOYSA-N [O-][Si]([O-])([O-])O.O.[Al+3] Chemical compound [O-][Si]([O-])([O-])O.O.[Al+3] NBWKWDNEHWZRMZ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012360 testing method Methods 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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
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- 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)
- Road Paving Structures (AREA)
Abstract
The invention discloses a geopolymer cementing material for a pavement base based on the synergy of multiple solid wastes and a preparation method thereof, which is mainly characterized in that fly ash, slag, carbide slag and desulfurized gypsum are used as main materials, various solid wastes are fully exerted, and the special geopolymer cementing material for the pavement base, which has various performance indexes meeting the requirements of JT/T994 + 2015 cement for stabilizing the pavement base in highway engineering, is prepared by three main processes of drying, grinding, secondary mixing and the like based on the principle of the geopolymer cementing material by utilizing the synergy and reinforcement effect. Compared with the traditional cement stabilized pavement base material, the shrinkage property of the cement stabilized pavement base material is greatly improved, and the damage of cracks on the pavement caused by the shrinkage of the base layer is remarkably reduced. Meanwhile, the invention not only can save a large amount of road building materials and fully utilize wastes, but also is beneficial to saving energy, reducing environmental pollution, saving resources, protecting environment, improving road quality and conforming to the green traffic development concept.
Description
Technical Field
The invention belongs to the field of traffic materials, and particularly relates to a geopolymer cementing material for a pavement base based on multi-element solid-waste synergy and a preparation method thereof.
Background
Along with the rapid development of highway traffic in China and the rapid construction period of highway networks of trunk lines in China and provinces, the demand of cementing materials for the pavement base of newly-built roads is huge, and the cement-based stable base is called as the pavement base which is most widely used in highway construction in China due to the advantages of high strength, good water stability, high raw material standardization degree and the like. However, the cement-based stable base layer has a large dry shrinkage coefficient, cracks are easily formed on the paved road base layer and reflected to the road surface to cause the crack of the road surface, and then the cracks are gradually enlarged to form pot holes along with the invasion of rainwater and the rolling of vehicles, so that the damage of the road surface is serious, which almost becomes the biggest problem in the later maintenance of the highway in China.
The cementing materials used by the prior cement stabilizing materials are mainly P.O 42.5R and P.C 32.5R cement, and due to the progress of cement calcining and grinding processes, the fineness and the early strength of the cement are obviously improved, and the drying shrinkage is more obvious, so that the cracking phenomenon of a cement stabilizing base layer is more serious, the severe influence is brought to the road quality in China, particularly, the difficulty, the engineering quantity and the cost of the post-maintenance of the road are extremely high, and the problem is not effectively solved so far. Meanwhile, with the implementation of a new JTG/T F20-2015 detailed rules for highway base course construction technology, the 7d unconfined compressive strength requirement of the cement stabilized base course material is greatly improved, the cement dosage in the cement stabilized material is directly and greatly improved, and the problem of cracking of the base course is further highlighted.
Therefore, the development of a special cementing material for a pavement base layer, which can reduce the cracking of the pavement base layer, is urgent. The geopolymer cementing material is [ AlO ] as one4]And [ SiO ]4]The novel aluminum-oxygen-silicate polymer cementing material formed by tetrahedron which the ionic bond and the covalent bond are used as main connectors and the Van der Waals bond is used as complementary connection has a series of advantages of high mechanical strength, acid and alkali corrosion resistance, compactness, good water and carbon resistance, wide raw material source, low production cost, small pollution and the like, and is gradually a hotspot of building material research. However, as the most comprehensive countries of industrial departments in the world, the industries such as metallurgy, electric power, chemical industry, mining industry and the like play a significant role in the development of the economic society of China, the productivity of the industries almost accounts for more than 50 percent of the whole world, and the heavy industries also discharge large amount every yearThe industrial solid waste is difficult to treat and utilize, and the ecological environment of China is seriously polluted. Therefore, the special geopolymer cementing material for the pavement base is developed by taking fly ash, slag, carbide slag, desulfurized gypsum and the like as main raw materials based on the principle of the geopolymer cementing material.
Disclosure of Invention
The invention aims to provide a geopolymer cementing material for a pavement base based on multi-element solid waste synergy and a preparation method thereof. On one hand, the cementing material for the pavement base is provided for highway engineering, the problem of pavement base cracking caused by using conventional P.O 42.5R and P.C 32.5R cement is solved, and meanwhile, the cost of the pavement base raw materials is obviously reduced. On the other hand, an efficient way is provided for the mass utilization of the fly ash, the slag, the carbide slag and the desulfurized gypsum, various solid waste characteristics are fully exerted, and the problem of environmental pollution caused by the solid waste characteristics is solved by utilizing the synergistic enhancement effect of the solid waste characteristics.
The invention adopts the following technical scheme:
a geopolymer cementing material for a pavement base based on multi-element solid waste synergy comprises the following raw materials in parts by weight: 25-31 parts of fly ash, 23-43 parts of slag, 25-50 parts of carbide slag and 5-15 parts of desulfurized gypsum, wherein the fly ash, the slag, the carbide slag and the desulfurized gypsum are prepared by mixing raw materials according to a Ca/Si molar ratio of 4.2-1.8, a Si/Al molar ratio of 2.1-1.6 and an Al/S molar ratio of 2.3-1.2; the parts by weight are on a dry basis.
A preparation method of a geopolymer cementing material for a pavement base based on multi-element solid waste cooperation mainly comprises three working procedures of drying, grinding, secondary mixing and the like, and specifically comprises the following steps:
(1) firstly, analyzing chemical components and moisture of fly ash, slag, carbide slag and desulfurized gypsum, then proportioning raw materials according to the chemical components, weighing the materials by a belt weigher, and conveying the materials into a drying rotary kiln for drying and uniformly mixing through a conveying belt;
(2) conveying the dried mixture obtained in the step 1) into a ball mill through a belt, and adding an alkali activator into the mixture through a bypass of the belt conveyor to obtain ground powder;
(3) and (3) respectively conveying the ground powder and the fly ash obtained in the step 2) to a cyclone mixer through an airflow conveying pipeline for mixing, and uniformly mixing through the cyclone mixer to obtain the geopolymer cementing material.
Further, the raw materials in the step 1) comprise 25-31 parts of fly ash, 23-43 parts of slag, 25-50 parts of carbide slag and 5-15 parts of desulfurized gypsum; the parts by weight are on a dry basis.
Further, in the step 1), the moisture of the dried material is controlled to be lower than 5%.
Further, the alkali activator in the step 2) mainly comprises NaOH and Na2CO3、Na2SO4·10H2O, KOH, the mixing amount of the alkali-activator is 1.7-5.2% of the mixture, and the weight ratio is calculated on a dry basis.
Further, the ball milling in the step 2) adopts a closed-circuit ball milling process, the fineness of the powder after ball milling is controlled to be 80 microns, the screen allowance of the square-hole screen is less than 10 percent, and the specific surface area is more than 450m2/g；
Further, the blending amount of the fly ash in the step 3) is 5-25% of the powder, and the weight ratio is calculated on a dry basis.
The use of said geopolymer cement for road base.
Advantageous effects
Compared with the prior cement stabilized macadam material technology, the pavement base prepared by the geopolymer cementing material can reduce the cement consumption and has lower cost. The characteristics of the calcium silicate slag and the fly ash can be fully exerted, the calcium silicate slag and the fly ash are changed into valuable materials to be consumed, the unconfined compressive strength, the freeze-thaw resistance, the drying shrinkage, the single-modulus recovery and other characteristics of the prepared base layer and base layer materials are obviously improved, particularly the drying shrinkage is greatly improved, and the crack damage of the pavement caused by the drying shrinkage of the base layer is obviously reduced.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1:
the chemical components of the fly ash, the slag, the carbide slag and the desulfurized gypsum used in the embodiment are shown in the following table 1, and the raw material ratio is carried out according to the molar ratio of Ca/Si of 3.2, the molar ratio of Si/Al of 1.8 and the molar ratio of Al/S of 1.5, wherein the fly ash (dry basis) is 25 parts, the slag (dry basis) is 40 parts, the carbide slag (dry basis) is 26 parts and the desulfurized gypsum (dry basis) is 9 parts.
TABLE 1 chemical composition of various solid waste materials
| Chemical composition | SiO2 | Fe2O3 | Al2O3 | CaO | MgO | Na2O | K2O | SO2 |
| Slag (dry basis) | 37.74 | 2.25 | 6.50 | 47.25 | 3.77 | 0.31 | 0.39 | 1.24 |
| Fly ash (dry basis) | 42.67 | 2.57 | 42.36 | 4.30 | 3.20 | 0.58 | 0.39 | 0.57 |
| Carbide slag (dry basis) | 7.90 | 0.96 | 0.50 | 63.93 | 1.27 | 0.13 | 0.24 | 0.03 |
| Desulfurized gypsum (dry basis) | 2.97 | 0.52 | 1.44 | 41.50 | 1.43 | 0.17 | 0.39 | 51.25 |
Converting dry-base fly ash, slag, carbide slag and desulfurized gypsum into wet base according to the moisture content of the dry-base fly ash, converting the wet base into wet base by using a belt weigher, conveying the wet base into a drying rotary kiln for drying and uniformly mixing, controlling the discharging moisture to be 3%, conveying the dried mixture into a ball mill by a belt, and adding 3.5% of alkali activator of the mixture (dry base) into the mixture by a belt conveyor bypass, wherein the alkali activator is matched with NaOH: na (Na)2SO4·10H2O: KOH of 5:3:2, and then a closed-circuit ball milling process is adopted, the fineness of the ball-milled powder is 8 percent of the screen allowance of a square-hole sieve with the fineness of 80 mu m, and the specific surface area is 473m2/g；
And (3) respectively conveying the ground powder and the fly ash to a cyclone mixer through an airflow conveying pipeline for mixing, wherein the mixing amount of the fly ash is 12.5 percent of the powder, and uniformly mixing through the cyclone mixer to prepare the geopolymer cementing material. And the physical properties of the material are analyzed and detected, the compressive strength and the flexural strength of 7d are respectively 15MPa and 3.2MPa, the compressive strength and the flexural strength of 28d are respectively 34.6MPa and 6.2MPa, the linear expansion coefficients of 7d and 28d are respectively 0.15 percent and 0.32 percent, the initial setting time is 4.2h, and the final setting time is 8.7 h. Meets the requirement of 32.5-level cement in standard JT/T994-.
The geopolymer for the pavement base is used as a cementing material, the graded broken stone in the proportion shown in Table 2 is used as the graded broken stone, 86 parts of graded broken stone, 6 parts of geopolymer cementing material and 8 parts of water are mixed, paved, rolled and maintained according to the existing cement stabilizing material base preparation process, the field detection compactness after rolling is 98.75 percent, the maximum dry density is 1.940g/cm3, the unconfined compressive strength of a drill core sampling 7d is 7.3Mpa, the deflection value is 16.2(0.01mm), the unconfined compressive strength of a 28d is 10.7Mpa, the unconfined compressive strength of a 90d is 15.2Mpa and the unconfined compressive strength of a 180d is 18.6 MPa. The loss rate of the strength of 5 times and 10 times of freeze-thaw cycles is 1.80 percent and 2.70 percent respectively, the water stability coefficients of 7d and 28d are 0.69 percent and 0.72 percent respectively, and the dry shrinkage coefficient of 28d is 6.8 multiplied by 10-5The compression resilience modulus is 1095MPa, the bending tension resilience moduli of 7D and 28D are 7080MPa and 8830MPa, and all detection results meet the design Specification for road asphalt pavement JTG D50-2006 medium and high speed highway base course requirement.
TABLE 2 base graded crushed stone ratio
Example 2:
the chemical components of the fly ash, the slag, the carbide slag and the desulfurized gypsum used in the embodiment are shown in the following table 3, and the raw material ratio is carried out according to the molar ratio of Ca/Si of 3.1, the molar ratio of Si/Al of 2.0 and the molar ratio of Al/S of 1.9, and the chemical components comprise 26 parts of fly ash (dry basis), 40 parts of slag (dry basis), 26 parts of carbide slag (dry basis) and 8 parts of desulfurized gypsum (dry basis).
TABLE 3 chemical composition of various solid waste materials
| Chemical composition | SiO2 | Fe2O3 | Al2O3 | CaO | MgO | Na2O | K2O | SO3 |
| Slag (dry basis) | 34.57 | 0.51 | 10.50 | 42.75 | 4.13 | 0.77 | 0.46 | 1.38 |
| Fly ash (dry basis) | 52.93 | 3.25 | 36.64 | 3.72 | 0.40 | 2.95 | 0.38 | 0.58 |
| Carbide slag (dry basis) | 8.50 | 1.27 | 0.50 | 65.25 | 0.96 | 0.13 | 0.24 | 0.03 |
| Desulfurized gypsum (dry basis) | 3.65 | 0.52 | 1.44 | 43.50 | 1.43 | 0.17 | 0.39 | 49.68 |
Converting dry-base fly ash, slag, carbide slag and desulfurized gypsum into wet base according to the moisture content of the dry-base fly ash, weighing the wet base by using a belt weigher, conveying the wet base into a drying rotary kiln for drying and uniformly mixing, controlling the discharging moisture to be 3.5%, conveying the dried mixture into a ball mill by a belt, and adding 4.5% of alkali activator of the mixture (dry base) into the mixture by a belt conveyor bypass, wherein the alkali activator is matched with NaOH: na (Na)2CO3: KOH is 6:2:2, then a closed-circuit ball milling process is adopted, the fineness of the ball-milled powder is 9 percent of the screen allowance of a square-hole screen with the fineness of 80 mu m, and the specific surface area is 465m2/g；
And (3) respectively conveying the ground powder and the fly ash to a cyclone mixer through an airflow conveying pipeline for mixing, wherein the mixing amount of the fly ash is 16.5 percent of the powder, and uniformly mixing through the cyclone mixer to prepare the geopolymer cementing material. And the physical properties of the material are analyzed and detected, the compressive strength and the flexural strength of 7d are respectively 13MPa and 2.6MPa, the compressive strength and the flexural strength of 28d are respectively 28.3MPa and 5.5MPa, the linear expansion coefficients of 7d and 28d are respectively 0.14 percent and 0.30 percent, the initial setting time is 4.5h, and the final setting time is 9.0 h. Meets the 27.5 grade cement requirement in standard JT/T994-.
The geopolymer for the pavement base is used as a cementing material, graded broken stones in the proportion shown in Table 4 are used, 88 parts of graded broken stones, 4 parts of geopolymer cementing material and 8 parts of water are mixed, paved, rolled and maintained according to the existing preparation process of the cement stabilizing material base, the compactness of the rolled cement stabilizing material base is 97.08% by field test, and the maximum dry density is 2.093g/cm3The 7d unconfined compressive strength of the core drilling sample is 3.9Mpa, the deflection value is 38.9(0.01mm), the 28d unconfined compressive strength is 5.1Mpa, the 90d unconfined compressive strength is 8.3Mpa, and the 180-day unconfined compressive strength is 8.5 MPa. The loss rate of the strength of the freeze-thaw cycle is 4.52 percent after 5 times and 10 times respectivelyAnd 6.50%, water stability coefficients of 7d and 28d of 0.67% and 0.62%, respectively, and a dry shrinkage coefficient of 28d of 5.6X 10-5The compression resilience modulus is 901MPa, the bending and pulling resilience moduli of 7D and 28D are 5840MPa and 7190MPa, and all detection results meet the requirements of a first-grade road subbase layer in road asphalt pavement design Specification JTG D50-2006.
TABLE 4 sub-base graded crushed stone mix ratio
Claims (8)
1. The geopolymer cementing material for the pavement base based on the multi-element solid waste synergy is characterized by comprising the following raw materials in parts by weight: 25-31 parts of fly ash, 23-43 parts of slag, 25-50 parts of carbide slag and 5-15 parts of desulfurized gypsum, wherein the fly ash, the slag, the carbide slag and the desulfurized gypsum are prepared by mixing raw materials according to a Ca/Si molar ratio of 4.2-1.8, a Si/Al molar ratio of 2.1-1.6 and an Al/S molar ratio of 2.3-1.2; the parts by weight are on a dry basis.
2. The preparation method of the geopolymer cementing material according to claim 1, which is characterized by mainly comprising three processes of drying, grinding, secondary blending and the like, and comprises the following specific steps:
1) firstly, analyzing chemical components and moisture of fly ash, slag, carbide slag and desulfurized gypsum, then proportioning raw materials according to the chemical components, weighing the materials by a belt weigher, and conveying the materials into a drying rotary kiln for drying and uniformly mixing through a conveying belt;
2) conveying the dried mixture obtained in the step 1) into a ball mill through a belt, and adding an alkali activator into the mixture through a bypass of the belt conveyor to obtain ground powder;
3) and (3) respectively conveying the powder and the fly ash ground in the step 2) to a cyclone mixer through an airflow conveying pipeline for mixing, and uniformly mixing through the cyclone mixer to prepare the geopolymer cementing material.
3. The preparation method of the geopolymer cementing material according to claim 2, characterized in that the raw material mixture ratio in the step 1) is 25 to 31 parts of fly ash, 23 to 43 parts of slag, 25 to 50 parts of carbide slag and 5 to 15 parts of desulfurized gypsum; the parts by weight are on a dry basis.
4. The method for preparing geopolymer cement of claim 2, wherein in step 1) the oven dried material moisture is controlled to less than 5%.
5. The method for preparing geopolymer cement according to claim 2, wherein in step 2), the alkali activator mainly comprises NaOH and Na2CO3、Na2SO4·10H2O, KOH, the mixing amount of the alkali-activator is 1.7-5.2% of the mixture, and the weight ratio is calculated on a dry basis.
6. The method for preparing the geopolymer cementing material of claim 2, wherein the ball milling in the step 2) adopts a closed-circuit ball milling process, the fineness of the powder after ball milling is controlled to be 80 μm, the residue of a square-hole sieve is less than 10%, and the specific surface area is more than 450m2/g。
7. The method for preparing geopolymer cement according to claim 2, wherein the amount of fly ash blended in step 3) is 5 to 25% of the amount of the fly ash, and the weight ratio is calculated on a dry basis.
8. Use of the geopolymer cement of claim 1 on a road base.
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| CN202110672124.4A CN113307595A (en) | 2021-06-17 | 2021-06-17 | Multi-element solid waste synergy-based geopolymer cementing material for pavement base and preparation method thereof |
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