CN116835912A - High-stability steel slag asphalt mixture and preparation method thereof - Google Patents
High-stability steel slag asphalt mixture and preparation method thereof Download PDFInfo
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- CN116835912A CN116835912A CN202310934875.8A CN202310934875A CN116835912A CN 116835912 A CN116835912 A CN 116835912A CN 202310934875 A CN202310934875 A CN 202310934875A CN 116835912 A CN116835912 A CN 116835912A
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- 239000002893 slag Substances 0.000 title claims abstract description 187
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 182
- 239000010959 steel Substances 0.000 title claims abstract description 182
- 239000010426 asphalt Substances 0.000 title claims abstract description 129
- 239000000203 mixture Substances 0.000 title claims abstract description 123
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 58
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 32
- 239000011707 mineral Substances 0.000 claims abstract description 32
- 239000003381 stabilizer Substances 0.000 claims abstract description 28
- 239000011159 matrix material Substances 0.000 claims abstract description 21
- 239000004575 stone Substances 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 239000003607 modifier Substances 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims description 41
- 239000008188 pellet Substances 0.000 claims description 20
- 238000005245 sintering Methods 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 239000002245 particle Substances 0.000 claims description 18
- 238000010521 absorption reaction Methods 0.000 claims description 16
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 15
- 239000000292 calcium oxide Substances 0.000 claims description 15
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- 235000019738 Limestone Nutrition 0.000 claims description 12
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical group [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 12
- 239000007822 coupling agent Substances 0.000 claims description 12
- 239000006028 limestone Substances 0.000 claims description 12
- 210000002268 wool Anatomy 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 239000010438 granite Substances 0.000 claims description 11
- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 claims description 10
- 229960000907 methylthioninium chloride Drugs 0.000 claims description 10
- 239000004576 sand Substances 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 8
- 229920005610 lignin Polymers 0.000 claims description 8
- 230000004048 modification Effects 0.000 claims description 8
- 238000012986 modification Methods 0.000 claims description 8
- 238000005299 abrasion Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 101100257136 Caenorhabditis elegans sma-5 gene Proteins 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 239000000395 magnesium oxide Substances 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 238000005453 pelletization Methods 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 235000015220 hamburgers Nutrition 0.000 claims description 2
- 238000013112 stability test Methods 0.000 claims description 2
- 238000010257 thawing Methods 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 11
- 230000000052 comparative effect Effects 0.000 description 9
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 5
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910019440 Mg(OH) Inorganic materials 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000011800 void material Substances 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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0032—Controlling the process of mixing, e.g. adding ingredients in a quantity depending on a measured or desired value
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The application belongs to the technical field of pavement materials, and particularly relates to a high-stability steel slag asphalt mixture and a preparation method thereof. The high-stability steel slag asphalt mixture comprises the following raw materials in parts by weight: 60-80 parts of coarse aggregate steel slag with the grain diameter of more than 2.36mm, 40-60 parts of fine aggregate stone with the grain diameter of less than 2.36mm, 10-15 parts of modified mineral powder, 20-25 parts of 90 # matrix asphalt, 15-30 parts of steel slag stabilizer and 0.4-0.5 part of asphalt modifier. The stability of the steel slag asphalt mixture is greatly improved, and the durability of the pavement can be enhanced by adopting the mixture.
Description
Technical Field
The application belongs to the technical field of pavement materials, and particularly relates to a high-stability steel slag asphalt mixture and a preparation method thereof.
Background
Because of the continuous consumption of road construction, excessive exploitation of non-renewable natural stone causes irrecoverable serious damage to the environment, and thus, finding an alternative material is necessary. The solid waste, steel slag, produced by industrial metallurgy is an ideal material because of their low cost and mineral composition similar to natural stone. Steel slag is a byproduct of industrial steelmaking, producing hundreds of millions of tons per year in China, however, only 20% of this material is recovered; the remaining total is over 7 hundred million tons and is typically dumped or buried in landfills. The stacked steel slag not only occupies a large amount of land resources, but also can generate dust and pollute the air; in addition, the steel slag buried in the landfill site can exude heavy metal ions to pollute soil and cause serious damage to the environment. Therefore, the road construction by replacing natural stone with steel slag is a win-win method for solving the problems. The steel slag has the advantages of rough surface, high strength and high wear resistance, has good physical and mechanical properties, and can be used as aggregate in asphalt pavement.
However, unlike natural stone materials, the steel slag surface contains an excess of free calcium oxide or/and free magnesium oxide. These free active ingredients, when contacted with water, hydrate to form Ca (OH) 2 、Mg(OH) 2 Etc., which in turn causes a volume expansion.
The pavement paved by using the common and conventional steel slag asphalt mixture is extremely easy to generate cracking and other diseases after meeting water, so that the water stability of the steel slag asphalt mixture is greatly influenced, the service life of the pavement is reduced, and the application of the steel slag on the asphalt pavement is limited.
At present, the stability of the steel slag is improved by adopting a traditional thermal heating method and a natural accumulation sedimentation method. The traditional heating method has the defects that the volume of equipment is large, special construction is needed, the operation requirement on the process is high, if a slag layer is not loosened in time in the treatment process, the slag bonding phenomenon can be generated, and the treatment effect of steel slag is adversely affected. And the steel slag is treated by natural accumulation sedimentation method for a long time and occupies a large area.
Disclosure of Invention
The application provides a high-stability steel slag asphalt mixture and a preparation method thereof in order to improve the stability of the steel slag asphalt mixture and enhance the durability of a pavement.
The technical scheme of the application is as follows:
a high-stability steel slag asphalt mixture comprises the following raw materials in parts by weight: 60-80 parts of coarse aggregate steel slag with the grain diameter of more than 2.36mm, 40-60 parts of fine aggregate stone with the grain diameter of less than 2.36mm, 10-15 parts of modified mineral powder, 20-25 parts of 90 # matrix asphalt, 15-30 parts of steel slag stabilizer and 0.4-0.5 part of asphalt modifier.
In the application, the crushing value of coarse aggregate steel slag in the high-stability steel slag asphalt mixture is less than or equal to 20%, the firmness is less than or equal to 10%, the needle-shaped content of more than or equal to 9.5mm is less than or equal to 6%, the weak particle content is less than or equal to 3.5%, the abrasion value is less than or equal to 20%, and the adhesiveness with asphalt is more than or equal to 6 grade.
The coarse aggregate steel slag is blast furnace steel slag; the fine aggregate stone is at least one of andesite, granite or basalt. The steel slag is used as alkaline aggregate, and is combined with andesite and granite fine materials, and under the guarantee that the steel slag stabilizer inhibits the instability of the steel slag, the andesite and granite fine aggregate adopted by the application are blended, so that the overall stability is higher, and the road performance of the mixture is more advantageous.
In the application, the performance indexes of the blast furnace steel slag in the high-stability steel slag asphalt mixture are as follows:
the apparent relative density of the 3-5mm blast furnace steel slag is 3.365-3.380, the bulk relative density of the wool is 3.160-3.175, the water absorption rate is 2.0-2.3%, and the content of free calcium oxide is 1.2-1.4%.
The apparent relative density of the 5-10mm blast furnace steel slag is 3.330-3.340, the bulk relative density of the wool is 3.090-3.100, the water absorption rate is 1.8-2.1%, and the content of free calcium oxide is 1.55-1.65%.
The apparent relative density of the blast furnace steel slag with the thickness of 10-15mm is 3.295-3.3100, the volume relative density of the wool is 3.050-3.150, the water absorption rate is 1.6-1.8%, and the content of free calcium oxide is 2.0-2.3%;
the apparent relative density of the andesite is more than or equal to 2.800, the sand equivalent is 70-85%, and the methylene blue value is 1.8-3.0g/kg.
The apparent relative density of the granite is more than or equal to 2.550, the sand equivalent is 80-90%, and the methylene blue value is 1.5-2.0g/kg.
The apparent relative density of the basalt is more than or equal to 2.730, the sand equivalent is 75-85%, and the methylene blue value is 2.3-2.8g/kg.
In the application, the modified mineral powder in the high-stability steel slag asphalt mixture is modified limestone mineral powder of a titanate coupling agent GR-201; the grain diameter of the steel slag stabilizer is 0.075-0.3mm; the asphalt modifier is a warm mix agent LEADCAP. The titanate coupling agent GR-201 modified limestone mineral powder is used as a filler, so that the adhesion between asphalt and aggregate can be obviously improved, the asphalt dosage can be reduced, and the oil absorption effect is achieved.
In the application, the grading range of the aggregate of the high-stability steel slag asphalt mixture adopts one of the following a, b and c:
a. the ratio of each gear of the AC-13 grading is as follows:
10-15mm steel slag: 5-10mm steel slag: 3-5mm steel slag: 0-3mm stone: modified mineral powder = 56-60:10-14:16-18:9:3, a step of; the amount of the 90 # matrix asphalt is 4.6-4.8wt%.
b. The SMA-13 grading materials have the following proportion:
modified mineral powder: 0-3mm stone: 5-10mm steel slag: 10-15mm steel slag = 8-10:10-14:30-35:44-48; the amount of the 90 # matrix asphalt is 5.9 to 6.1 weight percent; also comprises lignin fiber, the dosage of which is 3.3-3.5wt per mill.
c. The SMA-5 grading materials have the following proportion:
modified mineral powder: 0-3mm stone: 3-5mm steel slag = 8:31:59-63; the amount of the 90 # matrix asphalt is 6.1 to 6.3wt percent; also comprises lignin fiber, the dosage of which is 3.5 to 3.7 weight per mill.
In the application, the steel slag stabilizer in the high-stability steel slag asphalt mixture is prepared by the following method:
(1) And (3) batching: mixing FeO powder with purity of 99.5% and average particle size of 180-200 μm with MgO powder with purity of 99.9% and average particle size of 0.2-0.25 μm, and grinding to obtain powder mixture; wherein the mass ratio of FeO powder is as follows: mgO powder is 21-22:78-79;
(2) Granulating: pressing the powder mixture obtained in the step (1) into pellet particles with the diameter of 7-9mm and the weight of 0.3-0.5g by using a press; the pressing pressure is 2-2.5MPa; compacting into pellet particles can increase powder compaction and promote sintering.
(3) Primary sintering: sintering the pellet particles obtained in the step (2) for 24 hours in an airtight electric furnace with the pressure of high-purity argon gas of 1770-1780K and the partial pressure of 6-10 atm;
(4) Cooling, grinding and re-granulating: cooling the pellets obtained after primary sintering in the step (3) at the speed of 300K/h in a furnace, taking out the pellets after cooling, crushing the pellets into powder, grinding the powder, and re-granulating the powder;
(5) Secondary sintering: and (3) carrying out secondary sintering on the pellet obtained by re-pelletization according to the primary sintering condition of the step (3) to obtain the steel slag stabilizer.
The steel slag stabilizer prepared by the method has higher purity which can reach 95-98%, and the mass fraction of free components on the steel slag aggregate can be greatly reduced to 0.01-0.02wt% when the steel slag stabilizer with high purity is used in steel slag asphalt mixture.
In the application, the leakage loss of the high-stability steel slag asphalt mixture at normal temperature is less than 0.1%; the loss of the scattering test at 60 ℃ is 6-7%; dynamic stability test is carried out 4000-5000 times under the conditions of 70 ℃ and 1.0 MPa; deformation is 3-4mm in 20000 hamburger rutting tests at 50 ℃; the ratio of freeze thawing splitting strength is 88-95%, and the low-temperature bending strain is 2900-3400 mu epsilon.
The preparation method of the high-stability steel slag asphalt mixture comprises the following steps:
(1) Preparing warm mix asphalt: adding asphalt modifier into 90 # matrix asphalt, and stirring for 10-12min at 130-150deg.C and 1000-1200 rpm;
(2) Stable modification of coarse aggregate steel slag: mixing the steel slag coarse aggregate and the steel slag stabilizer for 80-90s at 140-150 ℃;
(3) Mixing the mixture: firstly, mixing the stabilized and modified coarse aggregate steel slag with fine aggregate stone for 90-120s, then adding the warm mix asphalt obtained in the step (1) to mix for 90-100s, and then adding modified mineral powder to mix for 80-90s after finishing; wherein the mixing temperature is 145-150 ℃.
If the mixing temperature is too high based on the mixed mixture condition, the aging of asphalt can be accelerated, so that the fatigue performance of the subsequent mixture is affected; however, too low a mixing temperature affects the void fraction of the mixture and may result in insufficient mixing.
In the application, the thickness of the warm mix asphalt film adhesive mixture in the preparation method of the high-stability steel slag asphalt mixture is 6-8 mu m.
The beneficial effects of the application are as follows:
1. the high-stability steel slag mixture provided by the application has the advantages that the mixing mode is a warm mixing mode, and compared with the traditional hot mixing mode, the high-stability steel slag mixture provided by the application can not only improve the adhesion between steel slag aggregate and warm-mixed asphalt, but also ensure the integrity and durability of subsequent rolling, and can also save energy. The temperature of the traditional hot-mix mixture is 170-200 ℃, the energy consumption is very high, the measured temperature value fluctuation is large easily in the mixing process, and the control cannot be accurately performed, so that the problems of ageing or caking of the mixture or the reduction of the adhesiveness of asphalt and aggregate and the like are caused. On the basis that the warm mixing can ensure that the mixing of the aggregate and the asphalt is sufficiently uniform, the temperature is controlled in a reasonable interval range, and the steel slag stabilizer and the fine aggregate attached to the surface of the steel slag aggregate are prevented from falling off due to the influence of high temperature, so that the overall stability is improved.
2. The application makes clear the preparation and material selection of the steel slag stabilizer, the warm mix asphalt and the modified mineral powder in the high-stability steel slag mixture, and limits the selection of fine aggregate, and effectively ensures the comprehensive road performance of the high-stability steel slag mixture by grading design of the performance index of the high-stability steel slag mixture.
3. The application solves the problem of instability and deformation caused by insufficient water stability of the traditional steel slag asphalt mixture, can effectively ensure the integrity and durability of road effect, and has remarkable economic benefit.
Drawings
FIG. 1 is a graph showing the grading of the SMA-13 high-stability steel slag asphalt mixture in example 1 of the present application.
FIG. 2 is a graph showing the grading of the AC-13 high-stability steel slag asphalt mixture in example 3 of the present application.
Detailed Description
The technical scheme of the application is described in detail below with reference to the accompanying drawings.
1. The adopted steel slag stabilizer is prepared by the following method:
(1) And (3) batching: mixing and grinding FeO powder with the mass fraction of 21.71% and the purity of 99.5% and the average particle diameter of 180 μm and MgO powder with the mass fraction of 78.29% and the purity of 99.9% and the average particle diameter of 0.2 μm to obtain a powder mixture;
(2) Granulating: pressing the powder mixture obtained in the step (1) into pellet particles with the diameter of 8mm and the weight of 0.4g by using a press; the pressing pressure is 2MPa; compacting into pellet particles can increase powder compaction and promote sintering.
(3) Primary sintering: sintering the pellet particles obtained in the step (2) in an airtight electric furnace with a high-purity argon pressure of 1773K and a partial pressure of 10atm for 24 hours;
(4) Cooling, grinding and re-granulating: cooling the pellets obtained after primary sintering in the step (3) at the speed of 300K/h in a furnace, taking out the pellets after cooling, crushing the pellets into powder, grinding the powder, and re-granulating the powder;
(5) Secondary sintering: and (3) carrying out secondary sintering on the pellet obtained by re-pelletization according to the primary sintering condition of the step (3) to obtain the steel slag stabilizer.
2. The adopted titanate coupling agent GR-201 modifies limestone mineral powder: titanate coupling agent GR-201, amphoteric compound and yellowish clear liquid, the density and flash point are respectively 1.026g/mL and 55 ℃ at the temperature of 30 ℃, and the modification mechanism is as follows, wherein the titanate coupling agent GR-201, the amphoteric compound and the yellowish clear liquid are compatible with organic auxiliary agents such as analytically pure absolute ethyl alcohol, analytically pure isopropyl alcohol and the like:
technical indexes of the titanate coupling agent GR-201 modified limestone mineral powder are shown in table 1:
TABLE 1
3. The technical indexes of the adopted 90-grade matrix asphalt are shown in table 2:
TABLE 2
Example 1 (SMA-13 high stability slag asphalt mixture)
The high-stability steel slag asphalt mixture comprises the following raw materials in parts by weight: 80 parts of coarse aggregate blast furnace steel slag with the grain diameter of more than 2.36mm, 60 parts of fine aggregate granite with the grain diameter of less than 2.36mm, 15 parts of titanate coupling agent GR-201 modified limestone mineral powder, 25 parts of 90-grade matrix asphalt, 25 parts of steel slag stabilizer and 0.5 part of asphalt warm mix agent LEADCAP.
The indexes of the blast furnace steel slag are shown in table 3:
TABLE 3 Table 3
| Test index | Steel slag aggregate |
| Crushing value (%) | 18 |
| Robustness (%) | 8 |
| The content of needle flakes (more than or equal to 9.5mm,%) | 3 |
| Content of weak granule (%) | 2 |
| Abrasion value (%) | 12 |
| Adhesion to asphalt (grade) | 7 |
The apparent relative density of the granite is 2.560, the sand equivalent is 83, and the methylene blue value is 1.8.
The aggregate grading of the SMA-13 high-stability steel slag asphalt mixture comprises the following components in percentage by weight:
mineral powder: granite 0-3 mm: 5-10mm blast furnace steel slag: 10-15mm blast furnace steel slag = 8:10.5:34:47.5; the asphalt consumption is 5.9wt percent, and the lignin fiber is 3.3wt per mill.
Wherein the apparent relative density of the 5-10mm blast furnace steel slag is 3.335, the bulk relative density of the wool is 3.090, the water absorption rate is 2.0%, and the content of free calcium oxide is 1.58%.
The apparent relative density of the 10-15mm blast furnace steel slag is 3.298, the bulk relative density of the wool is 3.056, the water absorption rate is 1.7%, and the content of free calcium oxide is 2.1%.
The synthetic grading of the SMA-13 high-stability steel slag asphalt mixture is shown in table 4:
the high-stability steel slag mixture composition of the embodiment is shown in table 4, wherein three compositions are initially selected, namely composition 1, composition 2 and composition 3, and composition 2 is finally adopted.
TABLE 4 Table 4
The preparation method of the high-stability steel slag asphalt mixture comprises the following steps:
(1) Preparing warm mix asphalt: adding asphalt warm mix agent LEADCAP into No. 90 matrix asphalt, and stirring at 150deg.C and 1000 rpm for 10min;
(2) Stable modification of coarse aggregate steel slag: firstly, mixing 5-10mm blast furnace steel slag in coarse aggregate steel slag with a steel slag stabilizer for 30s, then adding 10-15mm blast furnace steel slag, and continuing mixing for 60s; wherein the mixing temperature is 140 ℃;
(3) Mixing the mixture: firstly mixing the coarse aggregate steel slag and lignin fiber after stable modification with fine aggregate granite for 90s, then adding the warm mix asphalt obtained in the step (1) to mix for 90s, and then adding modified mineral powder to mix for 80s after finishing; wherein the mixing temperature is 145 ℃.
Wherein the thickness of the warm mix asphalt film adhesive mixture is 6 μm.
Example 2 (SMA-5 overcoat high stability slag asphalt mixture)
The high-stability steel slag asphalt mixture comprises the following raw materials in parts by weight: 70 parts of coarse aggregate blast furnace steel slag with the grain diameter of more than 2.36mm, 50 parts of fine aggregate andesite with the grain diameter of less than 2.36mm, 10 parts of titanate coupling agent GR-201 modified limestone mineral powder, 22 parts of 90-number matrix asphalt, 18 parts of steel slag stabilizer and 0.44 part of asphalt warm mix agent LEADCAP.
The indexes of the blast furnace steel slag are shown in table 5:
TABLE 5
| Test index | Steel slag aggregate |
| Crushing value (%) | 15 |
| Robustness (%) | 7 |
| The content of needle flakes (more than or equal to 9.5mm,%) | 5 |
| Content of weak granule (%) | 2.5 |
| Abrasion value (%) | 11 |
| Adhesion to asphalt (grade) | 6 |
The andesite had an apparent relative density of 2.812, a sand equivalent of 78% and a methylene blue value of 1.8g/kg.
The aggregate grading of the SMA-5 finish coat high-stability steel slag asphalt mixture comprises the following components in percentage by weight:
mineral powder: 0-3mm andesite: 3-5mm blast furnace steel slag = 8:31:61; the dosage of lignin fiber is 3.5wt per mill; the amount of bitumen was 6.1wt%.
Wherein the apparent relative density of the 3-5mm blast furnace steel slag is 3.370, the bulk relative density of the wool is 3.168, the water absorption rate is 2.2%, and the content of free calcium oxide is 1.3%.
The synthetic gradation of the SMA-5 overcoat high-stability steel slag asphalt mixture is shown in Table 6:
TABLE 6
| Screen mesh size (mm) | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Yield (%) | 72 | 47.1 | 33.4 | 23.4 | 15.2 | 8.7 | 7.3 | 5.2 |
| Required range (%) | 68-85 | 38-68 | 24-50 | 15-38 | 10-28 | 7-20 | 5-15 | 4-8 |
The preparation method of the high-stability steel slag asphalt mixture comprises the following steps:
(1) Preparing warm mix asphalt: adding asphalt warm mix agent LEADCAP into No. 90 matrix asphalt, and stirring at 140 deg.C and 1000 rpm for 10min;
(2) Stable modification of coarse aggregate steel slag: mixing the coarse aggregate blast furnace steel slag and the steel slag stabilizer for 80 seconds, wherein the mixing temperature is 145 ℃;
(3) Mixing the mixture: firstly mixing the stabilized and modified coarse aggregate steel slag and lignin fibers with fine aggregate andesite for 100s, then adding warm mix asphalt obtained in the step (1) for mixing for 100s, and then adding modified mineral powder for mixing for 90s after finishing; wherein the mixing temperature is 150 ℃.
Wherein the thickness of the warm mix asphalt film adhesive mixture is 8 μm.
Example 3 (AC-13 high stability slag asphalt mixture)
The high-stability steel slag asphalt mixture comprises the following raw materials in parts by weight: 60 parts of coarse aggregate blast furnace steel slag with the grain diameter of more than 2.36mm, 40 parts of fine aggregate basalt with the grain diameter of less than 2.36mm, 12 parts of titanate coupling agent GR-201 modified limestone mineral powder, 20 parts of 90-grade matrix asphalt, 16 parts of steel slag stabilizer and 0.4 part of asphalt warm mix agent LEADCAP.
The indexes of the blast furnace steel slag are shown in table 7:
TABLE 7
| Test index | Steel slag aggregate |
| Crushing value (%) | 12 |
| Robustness (%) | 8 |
| The content of needle flakes (more than or equal to 9.5mm,%) | 2 |
| Content of weak granule (%) | 2.0 |
| Abrasion value (%) | 10 |
| Adhesion to asphalt (grade) | 7 |
The basalt has an apparent relative density of 2.736, a sand equivalent of 76% and a methylene blue value of 2.5g/kg.
The ratio of each grade material in the aggregate grading of the AC-13 high-stability steel slag asphalt mixture is as follows: 10-15mm blast furnace steel slag: 5-10mm blast furnace steel slag: 3-5mm blast furnace steel slag: 0-3mm basalt: mineral powder=58: 12:18:9:3, a step of; the amount of bitumen was 4.6wt%.
Wherein the apparent relative density of the 3-5mm blast furnace steel slag is 3.378, the bulk relative density of the wool is 3.172, the water absorption rate is 2.3%, and the content of free calcium oxide is 1.4%.
The apparent relative density of the 5-10mm blast furnace steel slag is 3.340, the bulk relative density of the wool is 3.100, the water absorption rate is 1.9%, and the content of free calcium oxide is 1.61%.
The apparent relative density of the 10-15mm blast furnace steel slag is 3.303, the bulk relative density of the wool is 3.132, the water absorption rate is 1.8%, and the content of free calcium oxide is 2.2%.
The synthetic gradation of the AC-13 high-stability steel slag asphalt mixture is shown in Table 8:
TABLE 8
| Screen mesh size (mm) | 16 | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Yield (%) | 100 | 98 | 79.5 | 47.5 | 32.3 | 21.6 | 14.7 | 9.5 | 7.6 | 6.7 |
| Grading median (%) | 100 | 95 | 76.5 | 53 | 37 | 26.5 | 19 | 13.5 | 10 | 6 |
The preparation method of the high-stability steel slag asphalt mixture comprises the following steps:
(1) Preparing warm mix asphalt: adding asphalt warm mix agent LEADCAP into No. 90 matrix asphalt, and stirring at 130deg.C and 1200 rpm for 12min;
(2) Stable modification of coarse aggregate steel slag: firstly, mixing 5-10mm blast furnace steel slag in coarse aggregate steel slag with a steel slag stabilizer for 30s, then adding 3-5mm blast furnace steel slag and 10-15mm blast furnace steel slag, and continuously mixing for 60s; wherein the mixing temperature is 140 ℃;
(3) Mixing the mixture: firstly mixing the coarse aggregate steel slag after stable modification with the fine aggregate basalt for 110s, then adding the warm mix asphalt obtained in the step (1) to mix for 100s, and then adding the modified mineral powder to mix for 85s after finishing; wherein the mixing temperature is 150 ℃.
In the application, the thickness of the warm mix asphalt film adhesive mixture in the preparation method of the high-stability steel slag asphalt mixture is 7 mu m.
Comparative example 1
The high-stability steel slag asphalt mixture comprises the following raw materials in parts by weight: 80 parts of coarse aggregate blast furnace steel slag with the grain diameter of more than 2.36mm, 20 parts of fine aggregate granite with the grain diameter of less than 2.36mm, 8 parts of titanate coupling agent GR-201 modified limestone mineral powder, 22 parts of 90-number matrix asphalt, 12 parts of steel slag stabilizer and 0.3 part of asphalt warm mix agent LEADCAP.
Otherwise, the same as in example 3 was conducted.
Comparative example 2
The high-stability steel slag asphalt mixture comprises the following raw materials in parts by weight: 85 parts of coarse aggregate blast furnace steel slag with the grain diameter of more than 2.36mm, 15 parts of fine aggregate andesite with the grain diameter of less than 2.36mm, 10 parts of titanate coupling agent GR-201 modified limestone mineral powder, 24 parts of 90-number matrix asphalt, 15 parts of steel slag stabilizer and 0.4 part of asphalt warm mix agent LEADCAP.
Otherwise, the same as in example 3 was conducted.
Comparative example 3
The difference from example 2 was that the coarse aggregate steel slag was a converter steel slag having an apparent relative density of 2.95, a bulk relative density of 2.912, a water absorption of 2.43%, a crushing value of 17.2%, a solidity of 12%, a needle-like content of not less than 9.5mm of 12%, a weak particle content of 5%, and an abrasion value of 18.5%.
Otherwise, the same as in example 2 is carried out.
Comparative example 4
The difference from example 2 is that the coarse aggregate steel slag is an open-hearth steel slag, wherein the apparent relative density of the open-hearth steel slag is 3.124g/cm3, the bulk relative density of the wool is 3.100, the water absorption is 2.14%, the crushing value is 25.3%, the firmness is 11%, the needle-like content is not less than 9.5mm and is 10%, the weak particle content is 7%, and the abrasion value is 23%.
Otherwise, the same as in example 2 is carried out.
Comparative example 5
The difference from example 2 is that the fine aggregate is limestone, wherein the apparent relative density of the limestone is 2.610, the bulk relative density is 2.574, the water absorption is 0.54%, the methylene blue value is 2.1%, and the sand equivalent is 80%.
Comparative example 6
The difference from example 1 is that the asphalt used was SBS (type 1-D), the hot mix temperature was 185℃and the asphalt index is shown in Table 9. Otherwise, the same as in example 1 was conducted.
TABLE 9SBS modified asphalt Performance index
Comparative example 7
The difference with the example 2 is that the preparation method of the high-stability steel slag asphalt mixture of the comparative example comprises the following steps:
(1) Preparing warm mix asphalt: adding asphalt warm mix agent LEADCAP into No. 90 matrix asphalt, and stirring at 140 deg.C and 1000 rpm for 10min;
(2) Directly mixing: firstly, adding coarse aggregate steel slag and a steel slag stabilizer, and then sequentially adding fine aggregate andesite, modified mineral powder and warm mix asphalt obtained in the step (1); and (3) mixing at 150 ℃ to obtain the steel slag asphalt mixture.
Wherein the thickness of the warm mix asphalt film adhesive mixture is 8 μm.
The properties of the steel slag asphalt mixtures of the examples and comparative examples were measured, and the measurement results are shown in Table 10, wherein the free calcium oxide content in Table 10 is the free calcium oxide content on the surface of the steel slag after the steel slag as the coarse aggregate was mixed with the steel slag stabilizer.
Table 10
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Claims (9)
1. The high-stability steel slag asphalt mixture is characterized by comprising the following raw materials in parts by weight: 60-80 parts of coarse aggregate steel slag with the grain diameter of more than 2.36mm, 40-60 parts of fine aggregate stone with the grain diameter of less than 2.36mm, 10-15 parts of modified mineral powder, 20-25 parts of 90 # matrix asphalt, 15-30 parts of steel slag stabilizer and 0.4-0.5 part of asphalt modifier.
2. The high-stability steel slag asphalt mixture according to claim 1, wherein,
the crushing value of the coarse aggregate steel slag is less than or equal to 20%, the firmness is less than or equal to 10%, the needle-shaped content of the coarse aggregate steel slag is less than or equal to 9.5mm is less than or equal to 6%, the weak particle content is less than or equal to 3.5%, the abrasion value is less than or equal to 20%, and the adhesiveness with asphalt is more than or equal to 6 grade;
the coarse aggregate steel slag is blast furnace steel slag; the fine aggregate stone is at least one of andesite, granite or basalt.
3. The high-stability steel slag asphalt mixture according to claim 2, wherein,
the performance indexes of the blast furnace steel slag are as follows:
the apparent relative density of the 3-5mm blast furnace steel slag is 3.365-3.380, the bulk relative density of the wool is 3.160-3.175, the water absorption rate is 2.0-2.3%, and the content of free calcium oxide is 1.2-1.4%;
the apparent relative density of the 5-10mm blast furnace steel slag is 3.330-3.340, the bulk relative density of the wool is 3.090-3.100, the water absorption rate is 1.8-2.1%, and the free calcium oxide content is 1.55-1.65%;
the apparent relative density of the 10-15mm blast furnace steel slag is 3.295-3.3100, the bulk relative density is 3.050-3.150, the water absorption rate is 1.6-1.8%, and the free calcium oxide content is 2.0-2.3%;
the apparent relative density of the andesite is more than or equal to 2.800, the sand equivalent is 70-85%, and the methylene blue value is 1.8-3.0g/kg;
the apparent relative density of the granite is more than or equal to 2.550, the sand equivalent is 80-90%, and the methylene blue value is 1.5-2.0g/kg;
the apparent relative density of the basalt is more than or equal to 2.730, the sand equivalent is 75-85%, and the methylene blue value is 2.3-2.8g/kg.
4. The high-stability steel slag asphalt mixture according to claim 1, wherein the modified mineral powder is titanate coupling agent GR-201 modified limestone mineral powder; the grain diameter of the steel slag stabilizer is 0.075-0.3mm; the asphalt modifier is a warm mix agent LEADCAP.
5. The high-stability steel slag asphalt mixture according to claim 1, wherein the aggregate grading range is one of the following a, b, c:
a. the ratio of each gear in the AC-13 aggregate grading is as follows:
10-15mm steel slag: 5-10mm steel slag: 3-5mm steel slag: 0-3mm stone: modified mineral powder = 56-60:10-14:16-18:9:3, a step of; the amount of the 90 # matrix asphalt is 4.6 to 4.8 weight percent;
b. the ratio of each gear in the SMA-13 aggregate grading is as follows:
modified mineral powder: 0-3mm stone: 5-10mm steel slag: 10-15mm steel slag = 8-10:10-14:30-35:44-48; the amount of the 90 # matrix asphalt is 5.9 to 6.1 weight percent; the lignin fiber is 3.3-3.5 wt%;
c. the ratio of each gear in the SMA-5 aggregate grading is as follows:
modified mineral powder: 0-3mm stone: 3-5mm steel slag = 8:31:59-63; the amount of the 90 # matrix asphalt is 6.1 to 6.3wt percent; also comprises lignin fiber, the dosage of which is 3.5 to 3.7 weight per mill.
6. The high-stability steel slag asphalt mixture according to claim 1, wherein the steel slag stabilizer is prepared by the following method:
(1) And (3) batching: mixing FeO powder with purity of 99.5% and average particle size of 180-200 μm with MgO powder with purity of 99.9% and average particle size of 0.2-0.25 μm, and grinding to obtain powder mixture; wherein the mass ratio of FeO powder is as follows: mgO powder is 21-22:78-79;
(2) Granulating: pressing the powder mixture obtained in the step (1) into pellet particles with the diameter of 7-9mm and the weight of 0.3-0.5g by using a press;
(3) Primary sintering: sintering the pellet particles obtained in the step (2) for 24 hours in an airtight electric furnace with the pressure of high-purity argon gas of 1770-1780K and the partial pressure of 6-10 atm;
(4) Cooling, grinding and re-granulating: cooling the pellets obtained after primary sintering in the step (3) at the speed of 300K/h in a furnace, taking out the pellets after cooling, crushing the pellets into powder, grinding the powder, and re-granulating the powder;
(5) Secondary sintering: and (3) carrying out secondary sintering on the pellet obtained by re-pelletization according to the primary sintering condition of the step (3) to obtain the steel slag stabilizer.
7. The high-stability steel slag asphalt mixture according to claim 1, wherein the steel slag asphalt mixture has a normal temperature precipitation loss of <0.1%; the loss of the scattering test at 60 ℃ is 6-7%; dynamic stability test is carried out 4000-5000 times under the conditions of 70 ℃ and 1.0 MPa; deformation is 3-4mm in 20000 hamburger rutting tests at 50 ℃; the ratio of freeze thawing splitting strength is 88-95%, and the low-temperature bending strain is 2900-3400 mu epsilon.
8. A method for preparing the high-stability steel slag asphalt mixture according to any one of claims 1 to 7, comprising the following steps:
(1) Preparing warm mix asphalt: adding asphalt modifier into 90 # matrix asphalt, and stirring for 10-12min at 130-150deg.C and 1000-1200 rpm;
(2) Stable modification of coarse aggregate steel slag: mixing the steel slag coarse aggregate and the steel slag stabilizer for 80-90s at 140-150 ℃;
(3) Mixing the mixture: firstly, mixing the stabilized and modified coarse aggregate steel slag with fine aggregate stone for 90-120s, then adding the warm mix asphalt obtained in the step (1) to mix for 90-100s, and then adding modified mineral powder to mix for 80-90s after finishing; wherein the mixing temperature is 145-150 ℃.
9. The method for preparing high-stability steel slag asphalt mixture according to claim 8, wherein the thickness of the warm mix asphalt film adhesive mixture is 6-8 μm.
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| CN117700184A (en) * | 2024-02-05 | 2024-03-15 | 山东高速建设管理集团有限公司 | Crack self-repairing early-strength concrete and preparation process thereof |
| CN117819879A (en) * | 2024-03-05 | 2024-04-05 | 山东交通学院 | Low-temperature environment-friendly full-heat-braised steel slag aggregate asphalt mixture and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117700184A (en) * | 2024-02-05 | 2024-03-15 | 山东高速建设管理集团有限公司 | Crack self-repairing early-strength concrete and preparation process thereof |
| CN117700184B (en) * | 2024-02-05 | 2024-04-30 | 山东高速建设管理集团有限公司 | Crack self-repairing early-strength concrete and preparation process thereof |
| CN117819879A (en) * | 2024-03-05 | 2024-04-05 | 山东交通学院 | Low-temperature environment-friendly full-heat-braised steel slag aggregate asphalt mixture and preparation method thereof |
| CN117819879B (en) * | 2024-03-05 | 2024-05-10 | 山东交通学院 | Low-temperature environment-friendly full-heat-braised steel slag aggregate asphalt mixture and preparation method thereof |
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