CN112125630B - High-content phosphogypsum-based stabilizing material and application thereof in road base - Google Patents
High-content phosphogypsum-based stabilizing material and application thereof in road base Download PDFInfo
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- CN112125630B CN112125630B CN202011018545.7A CN202011018545A CN112125630B CN 112125630 B CN112125630 B CN 112125630B CN 202011018545 A CN202011018545 A CN 202011018545A CN 112125630 B CN112125630 B CN 112125630B
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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
- C04B28/143—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 phosphogypsum
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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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
- 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
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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
- 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
Abstract
The invention provides a high-content phosphogypsum-based stable material, which comprises the following raw materials in dry weight percentage: ardealite, slag, cement and a modifier. The modifier consists of calcium chloride, petroleum coke desulfurized ash, bentonite, talcum powder and casein. The preparation process of the high-doped phosphogypsum-based stable material is simple and feasible, energy-saving and environment-friendly, and easy to popularize; the large-dosage phosphogypsum-based stable material has better performance and low toxicity; the utilization rate of the phosphogypsum is high.
Description
Technical Field
The invention relates to a preparation method of a high-content phosphogypsum-based stable material and application of the high-content phosphogypsum-based stable material in a road base layer, and belongs to the field of road materials and preparation.
Background
The phosphogypsum is a large amount of industrial solid waste discharged in the process of extracting phosphoric acid by decomposing phosphate rock with sulfuric acid, about 5 tons of phosphogypsum is generated by preparing 1 ton of phosphoric acid, the main components of the phosphogypsum comprise calcium sulfate, phosphorus compounds, soluble fluorine, organic matters and the like, about 2.8 million tons of phosphogypsum are generated every year all over the world, the yield of the phosphogypsum in 2018 in China is 7 ten thousand, but the comprehensive utilization rate is 39.7 percent, the technology for environment-friendly and efficient large-amount utilization of the phosphogypsum is lacked, the phosphogypsum is mainly treated in a stacking mode at present, not only a large amount of land is occupied, but harmful substances such as soluble phosphorus, fluorine and the like are soaked in soil, water bodies and vegetation after long-term stacking, so that the ecological environment is seriously influenced, and simultaneously, the bottleneck of economic rapid development and environmental protection of phosphorus chemical enterprises is disturbed.
According to the structural form of municipal roads and highways, a road base structure of 50-120cm is arranged between a road surface and a roadbed, so that a large amount of building materials can be consumed, related scholars also develop research and application of phosphogypsum for a road base, but broken stones, stone chips, mineral powder, cement and phosphogypsum are intensively adopted to be mixed, or wet grinding pretreatment is required to be carried out on the phosphogypsum, or organic rubber powder is added to physically wrap the phosphogypsum for bonding. The research and application of the road base layer adopting the fine grain system of the original phosphogypsum, the cement, the mineral powder and other sub-nano powder are almost not available. Under the current national strict resource and environment control policy of quarrying, mountain forest and the like, the more tense the aggregate resource is originally, the higher the price is, and great pressure is brought to engineering construction. The phosphogypsum is utilized to the maximum extent, aggregate resources such as broken stones and stone chips are reduced, the technical requirements of a road base can be met, and the pressure can be relieved to a great extent.
Disclosure of Invention
The invention aims to fully utilize the characteristics of phosphogypsum particle gradation and potential activity, activate and modify by adopting slag, cement, a modifier and the like, passivate the activity of toxic substances in the phosphogypsum, reduce the leaching rate of the toxic substances and promote the formation of a gelling system structure by a core component in the modifier, and the main raw material is solid waste, has low cost and good performance, not only consumes large using amount of the phosphogypsum, but also can expand the new variety of road base material and relieve the tension condition of the road base material in areas lacking sandstone materials but rich in phosphogypsum.
The invention thus achieves the above object:
a high-content phosphogypsum-based stable material comprises the following raw materials in percentage by dry weight: 64-74% of undisturbed phosphogypsum, 13-20% of slag, 7-13% of cement and 4-6% of modifier, and water accounts for 10-15% of the total dry solid.
The phosphogypsum is the undisturbed phosphogypsum accumulated in a tailing pond, the content of free phosphorus is less than or equal to 6.0mg/L, the content of free fluoride ions is less than or equal to 350mg/L, and the particle size with the sieving passing rate of 50 percent is less than 50um.
The specific surface area of the slag is more than or equal to 700 m 2 The grain diameter is less than 15 um, wherein the screening passing rate is 50%. The specific surface area of the cement is more than or equal to 330m 2 The grain size is less than 35um, wherein the grain size is 50 percent of the grain size per kg. The modifier is prepared by mixing 25-35% of calcium chloride, 18-25% of petroleum coke desulfurized ash, 15-25% of bentonite, 18-27% of talcum powder and 5-15% of casein by mass through ultrasonic emulsification, drying and grinding at 50-60 ℃.
The modifier is prepared by mixing 30% of calcium chloride, 22% of petroleum coke desulfurized ash, 18% of bentonite, 21% of talcum powder and 9% of casein by mass percent through ultrasonic emulsification, drying and grinding at the temperature of 60 ℃.
The screening passing rates of the phosphogypsum, the cement and the slag are different from 50%, the grain sizes of main grains are in gradient distribution, part of bigger grains can be crushed under the action of a smooth wheel or a vibration press to form continuous gradation with different grain sizes, the grains are mutually filled and gradually compacted, the contact probability among the grains is higher and higher, the contact specific surface area is enlarged, casein and the like in a modifier and the like accelerate the approaching speed among the grains, and the reaction of gelling active substances in the components is accelerated under the condition of the existence of a proper amount of moisture; because the undisturbed phosphogypsum contains a small amount of harmful substances such as acid, phosphorus and the like, the phosphogypsum is adsorbed and fixed by calcium chloride, bentonite, talcum powder and the like in a modifier in repeated rolling and static pressure; under the grinding force effect that smooth wheel or vibration press produced, the rubbing action aggravation between the granule, can be with active material surface coating graze and then expose the active material that gels, the granule surface is more and more rough, and the temperature rise that the rubbing action produced has in addition promoted the active reaction and has gone on. The superposition of the functions and the reaction gelation of the gelation active substance improve the compactness and the strength of the mixture and reduce the leaching of harmful substances, thereby forming a road base stabilizing material with good performance.
The high-doping-amount phosphogypsum-based stable material is paved to 35 to 45cm, is compacted by a double-steel-wheel road roller for 1 to 2 times under static pressure of 10 to 12t, is compacted by a single-steel-wheel vibratory road roller for 1 to 2 times under static pressure and then is weakly vibrated for 1 to 2 times, is weakly vibrated for 1 to 2 times by a single-steel-wheel vibratory road roller for 20 to 22 t, is pressed again for 2 to 4 times by the road roller for 26t, and is covered by a film and geotextile for self-maintenance for not less than 21 days, so that a high-doping-amount phosphogypsum-based stable material road base layer can be formed.
The invention has the advantages that: (1) The preparation process of the high-doped phosphogypsum-based stable material is simple and feasible, energy-saving and environment-friendly, and easy to popularize; (2) The large-dosage phosphogypsum-based stable material has better performance and low toxicity; and (3) the utilization rate of the phosphogypsum is high.
Detailed Description
Example 1
The adopted undisturbed phosphogypsum has the free phosphorus content of 5.2mg/L and the free fluoride ion content of 329mg/L, the particle size with the sieving passing rate of 50 percent is 47.1um, and the particle size distribution with the sieving passing rate of slag and cement of 50 percent is 14.6 um and 33.5um. Dry basis proportion: 64kg of undisturbed phosphogypsum, 20kg of slag, 10kg of cement, 6kg of modifier and 15.0kg of water content of the mixture. The modifier is prepared by mixing 1.8kg of calcium chloride, 1.32kg of petroleum coke desulfurization ash, 1.08kg of bentonite, 1.26kg of talcum powder and 0.54kg of casein through ultrasonic emulsification, drying and grinding at the temperature of 60 ℃. The high-doping-amount phosphogypsum-based stabilizing material is prepared according to the procedure that metered undisturbed phosphogypsum, slag powder and cement are added into a continuous stabilizing soil stirrer to be uniformly mixed for 45s, then a modifier is added to be mixed and stirred for 20s, then water is added to be mixed and stirred for 25 s.
The high-doping-amount phosphogypsum-based stable material is transported to a specified construction site by a closed earth moving vehicle for 40min to 120min, then is spread to 35 to 45cm, is compacted for 1 to 2 times by a double-steel-wheel road roller for 10 to 12t under static pressure, then is compacted for 1 to 2 times under static pressure by a single-steel-wheel vibratory road roller for 26t, is then vibrated for 1 to 2 times under weak vibration by a single-steel-wheel vibratory road roller for 20 to 22 t, is pressed for 2 to 4 times again by a road roller for 26t, and is covered and sealed by a film and geotextile for self-maintenance for not less than 21 days.
After 21 days, leachate was prepared according to "solid waste leaching toxicity leaching method horizontal oscillation method" (HJ 557-2010). The content of total phosphorus in the leachate is detected according to an ammonium metapholybdate spectrophotometry method for determining total phosphorus in solid waste (HJ 712-2014), the content of fluorine ions is detected according to an ion selective electrode method for determining fluoride in solid waste (GB/T15555.11-1995), the concentration of fluorine ions in the leachate is 1.23mg/L, the total phosphorus is 0.17mg/L, and the requirement of a water body standard of class V in the environmental quality standard of surface water (GB 3838-2002) is met. The minimum unconfined compressive strength is 4.12MPa, phi 150mm is drilled after 21 days, the minimum coring strength is 3.87MPa, the minimum compaction degree is 99.1 percent, and the requirement of a first-level highway heavy traffic channel base layer in the highway asphalt pavement design Specification (JTG D50-2017) is met, so that the high-doping-amount phosphogypsum-based stable material road base layer can be formed.
Example 2
The adopted undisturbed phosphogypsum has the free phosphorus content of 5.2mg/L and the free fluoride ion content of 329mg/L, the particle size with the sieving passing rate of 50 percent is 47.1um, and the particle size distribution with the sieving passing rate of 50 percent of slag and cement is 14.6 um and 33.5um. Dry basis proportion: 70kg of undisturbed phosphogypsum, 20kg of slag, 10kg of cement and 15.0kg of water content of the mixture. The phosphogypsum-based stable material is obtained by the procedure of adding the measured undisturbed phosphogypsum, slag powder and cement into a continuous stable soil stirrer for uniform mixing for 45s, then adding water, and mixing and stirring for 25 s.
And (3) the phosphogypsum-based stable material is transported to a specified construction site by a closed earth vehicle at 40min to 120min, then paved to 35 to 45cm, compacted for 1 to 2 times by a double-steel-wheel road roller at 10 to 12t under static pressure, then compacted for 1 to 2 times by a single-steel-wheel vibratory road roller at 26t under static pressure, then weakly vibrated for 1 to 2 times by a single-steel-wheel vibratory road roller at 20 to 22 t, and finally re-pressed for 2 to 4 times by the road roller at 26t, and then covered by a film and geotextile for closed self-maintenance for not less than 21 days.
After 21 days, leachate was prepared according to the "solid waste leaching toxicity leaching method horizontal oscillation method" (HJ 557-2010). The content of total phosphorus in the leachate is detected according to an ammonium metapholybdate spectrophotometry method (HJ 712-2014) for determining total phosphorus in solid waste, the content of fluorine ions is detected according to an ion selective electrode method (GB/T15555.11-1995) for determining fluoride in the solid waste, the concentration of the fluorine ions in the leachate is 2.34mg/L, the total phosphorus is 0.77mg/L, and the requirement of a water body standard of the environmental quality standard of surface water (GB 3838-2002) V is not met. The minimum unconfined compressive strength is 3.23MPa, phi 150mm is drilled after 21 days, the minimum strength of the core is 3.11MPa, the minimum compactness is 90.5%, and the strength does not meet the requirement of the first-level highway heavy traffic channel base layer of the highway asphalt pavement design Specification (JTG D50-2017).
Example 3
The content of free phosphorus in the adopted undisturbed phosphogypsum is 4.7mg/L, the content of free fluorine ions is 291mg/L, the particle size with the sieving passing rate of 50 percent is 44.5um, and the particle size distribution with the sieving passing rate of slag and cement of 50 percent is 13.9um and 31.4um. Dry basis proportion: 69kg of undisturbed phosphogypsum, 13kg of slag, 13kg of cement, 5kg of modifier and 15.0kg of water content of the mixture. The modifier is prepared by mixing 1.5kg of calcium chloride, 1.1kg of petroleum coke desulfurized ash, 0.9kg of bentonite, 1.05kg of talcum powder and 0.45kg of casein through ultrasonic emulsification, drying and grinding at the temperature of 60 ℃. The large-dosage phosphogypsum-based stabilizing material is prepared according to the procedure that the metered original phosphogypsum, slag powder and cement are added into a continuous stabilizing soil stirrer to be uniformly mixed for 40s, then the modifier is added to be mixed and stirred for 22s, then the water is added to be mixed and stirred for 20s, and then the large-dosage phosphogypsum-based stabilizing material is prepared.
The high-doping-amount phosphogypsum-based stable material is transported to a specified construction site by a closed earth moving vehicle for 40min to 120min, then is spread to 35 to 45cm, is compacted for 1 to 2 times by a double-steel-wheel road roller for 10 to 12t under static pressure, then is compacted for 1 to 2 times under static pressure by a single-steel-wheel vibratory road roller for 26t, is then vibrated for 1 to 2 times under weak vibration by a single-steel-wheel vibratory road roller for 20 to 22 t, is pressed for 2 to 4 times again by a road roller for 26t, and is covered and sealed by a film and geotextile for self-maintenance for not less than 21 days.
After 21 days, leachate was prepared according to the "solid waste leaching toxicity leaching method horizontal oscillation method" (HJ 557-2010). The content of total phosphorus in the leachate is detected according to an ammonium metapholybdate spectrophotometry method for determining total phosphorus in solid waste (HJ 712-2014), the content of fluorine ions is detected according to an ion selective electrode method for determining fluoride in solid waste (GB/T15555.11-1995), the concentration of fluorine ions in the leachate is 1.36mg/L, the total phosphorus is 0.29mg/L, and the requirement of a water body standard of class V in the environmental quality standard of surface water (GB 3838-2002) is met. The minimum unconfined compressive strength is 3.97MPa, phi 150mm is drilled after 21 days, the minimum coring strength is 3.76MPa, the minimum compaction degree is 98.8 percent, and the requirement of a first-level highway heavy traffic road base layer in the highway asphalt pavement design Specification (JTG D50-2017) is met, so that the high-doping-amount phosphogypsum-based stable material road base layer can be formed.
Example 4
The content of free phosphorus in the adopted undisturbed phosphogypsum is 4.7mg/L, the content of free fluorine ions is 291mg/L, the particle size with the sieving passing rate of 50 percent is 44.5um, and the particle size distribution with the sieving passing rate of slag and cement of 50 percent is 13.9um and 31.4um. Dry basis proportion: 69kg of undisturbed phosphogypsum, 13kg of slag, 12kg of cement, 7kg of modifier and 15.0kg of water content of the mixture. The modifier is prepared by mixing 1.5kg of calcium chloride, 1.1kg of petroleum coke desulfurized ash and 1.05kg of talcum powder through ultrasonic emulsification, drying and grinding at the temperature of 60 ℃. Adding the measured original phosphogypsum, slag powder and cement into a continuous stabilized soil stirrer, uniformly mixing for 40s, adding the modifier, mixing and stirring for 22s, then adding water, mixing and stirring for 20s to obtain the phosphogypsum-based stabilizing material with large doping amount.
And (3) the phosphogypsum-based stable material is transported to a specified construction site by a closed earth vehicle at 40min to 120min, then paved to 35 to 45cm, compacted for 1 to 2 times by a double-steel-wheel road roller at 10 to 12t under static pressure, then compacted for 1 to 2 times by a single-steel-wheel vibratory road roller at 26t under static pressure, then weakly vibrated for 1 to 2 times by a single-steel-wheel vibratory road roller at 20 to 22 t, and finally re-pressed for 2 to 4 times by the road roller at 26t, and then covered by a film and geotextile for closed self-maintenance for not less than 21 days.
After 21 days, leachate was prepared according to the "solid waste leaching toxicity leaching method horizontal oscillation method" (HJ 557-2010). The content of total phosphorus in the leachate is detected according to an ammonium metapholybdate spectrophotometry method for determining total phosphorus in solid waste (HJ 712-2014), the content of fluorine ions is detected according to an ion selective electrode method for determining fluoride in solid waste (GB/T15555.11-1995), the concentration of fluorine ions in the leachate is 1.12mg/L, the total phosphorus is 0.15mg/L, and the requirement of a water body standard of class V in the environmental quality standard of surface water (GB 3838-2002) is met. The minimum unconfined compressive strength is 3.73MPa, phi 150mm is drilled after 21 days, the minimum strength of coring is 3.27MPa, the minimum compactness is 89.2%, and the compactness does not meet the requirement of primary highway heavy traffic channel base course of highway asphalt pavement design Specification (JTG D50-2017).
Example 5
The adopted undisturbed phosphogypsum has the free phosphorus content of 4.4mg/L and the free fluoride ion of 287mg/L, the particle size with the sieving passing rate of 50 percent is 41.6um, and the particle size distribution with the sieving passing rate of slag and cement of 50 percent is 12.7um and 28.4um. Dry basis proportion: 74kg of undisturbed phosphogypsum, 15kg of slag, 7kg of cement, 4kg of modifier and 15.0kg of water content of the mixture. The modifier is prepared by mixing 1.2kg of calcium chloride, 0.88kg of petroleum coke desulfurization ash, 0.72kg of bentonite, 0.84kg of talcum powder and 0.39kg of casein through ultrasonic emulsification, drying and grinding at the temperature of 60 ℃. The high-doped phosphogypsum-based stabilizing material is prepared according to the procedure of adding the metered undisturbed phosphogypsum, slag powder and cement into a continuous stabilized soil stirrer for even mixing for 35s, adding the modifier for mixing and stirring for 25s, then adding the water, and mixing and stirring for 15 s.
The high-doping-amount phosphogypsum-based stable material is transported to a specified construction site by a closed earth moving vehicle for 40min to 120min, then is spread to 35 to 45cm, is compacted for 1 to 2 times by a double-steel-wheel road roller for 10 to 12t under static pressure, then is compacted for 1 to 2 times under static pressure by a single-steel-wheel vibratory road roller for 26t, is then vibrated for 1 to 2 times under weak vibration by a single-steel-wheel vibratory road roller for 20 to 22 t, is pressed for 2 to 4 times again by a road roller for 26t, and is covered and sealed by a film and geotextile for self-maintenance for not less than 21 days.
After 21 days, leachate was prepared according to the "solid waste leaching toxicity leaching method horizontal oscillation method" (HJ 557-2010). The content of total phosphorus in the leachate is detected according to an ammonium metapholybdate spectrophotometry method (HJ 712-2014) for determining total phosphorus in solid waste, the content of fluorine ions is detected according to an ion selective electrode method (GB/T15555.11-1995) for determining fluoride in the solid waste, the concentration of the fluorine ions in the leachate is 1.47mg/L, the total phosphorus is 0.31mg/L, and the requirement of a water body standard of the environmental quality standard of surface water (GB 3838-2002) V is met. The minimum unconfined compressive strength is 3.88MPa, a core sample with the diameter of phi 150mm is drilled after 21 days, the minimum strength of coring is 3.64MPa, the minimum compaction degree is 98.4 percent, and the requirement of a first-level highway heavy traffic channel base course in the highway asphalt pavement design specification (JTG D50-2017) is met, so that the high-doping-amount phosphogypsum-based stable material road base course can be formed.
Claims (6)
1. A preparation method of a high-doping-amount phosphogypsum-based stable material is characterized in that metered phosphogypsum, slag powder and cement are added into a continuous stable soil stirrer to be mixed for 35 to 45s, then a modifier is added to be mixed and stirred for 20 to 25s, then water is added, the water accounts for 10 to 15 percent of the total amount of dry raw materials, and the mixture is stirred for 15 to 25s to obtain the high-doping-amount phosphogypsum-based stable material;
the dry weight percentage of each raw material of the mixed material is as follows: 64-74% of phosphogypsum, 13-20% of slag, 7-13% of cement and 4-6% of modifier, wherein the modifier is prepared by mixing 25-35% of calcium chloride, 18-25% of petroleum coke desulfurization ash, 15-25% of bentonite, 18-27% of talcum powder and 5-15% of casein through ultrasonic emulsification, drying and grinding.
2. The method for preparing the high content phosphogypsum-based stabilizing material according to claim 1, which is characterized in that: the content of free phosphorus in the phosphogypsum is less than or equal to 6.0mg/L, the content of free fluoride ions is less than or equal to 350mg/L, and the particle size with the sieving passing rate of 50 percent is less than 50um.
3. The method for preparing the high content phosphogypsum-based stabilizing material according to claim 1, which is characterized in that: the specific surface area of the slag is more than or equal to 700 m2/kg, and the screening passing rate is 50% and the particle size is less than 15 um.
4. The method for preparing the high content phosphogypsum-based stabilizing material according to claim 1, which is characterized in that: the specific surface area of the cement is more than or equal to 330m < 2 >/kg, and the screening passing rate is 50 percent, and the particle size is less than 35um.
5. The method for preparing the high content phosphogypsum-based stabilizing material according to claim 1, which is characterized in that: the modifier is prepared by mixing 30% of calcium chloride, 22% of petroleum coke desulfurized ash, 18% of bentonite, 21% of talcum powder and 9% of casein by mass percent through ultrasonic emulsification, drying and grinding.
6. The application of the high-content phosphogypsum-based stable material prepared by any one of claims 1 to 5 as a road base material is characterized in that: and (3) paving the high-doping-amount phosphogypsum-based stabilizing material to 35 to 45cm, compacting by static pressure for 1 to 2 times through a 10 to 12t double-drum road roller, compacting by static pressure for 1 to 2 times through a 26t single-drum vibratory roller, then performing weak vibration for 1 to 2 times through a 20 to 22 t single-drum vibratory roller, re-compacting for 2 to 4 times through a 26t road roller, and then covering and sealing by using a film and geotextile for self-curing for not less than 21 days to form the high-doping-amount phosphogypsum-based stabilizing material road base layer.
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