CN112252108B - Road construction method for in-situ cold recycling of asphalt pavement - Google Patents
Road construction method for in-situ cold recycling of asphalt pavement Download PDFInfo
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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
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
- E01C7/26—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders mixed with other materials, e.g. cement, rubber, leather, fibre
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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
- 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
- C04B18/16—Waste materials; Refuse from building or ceramic industry
- C04B18/167—Recycled materials, i.e. waste materials reused in the production of the same materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention relates to a road construction method for in-situ cold recycling of an asphalt pavement, which comprises the following steps of 1) construction preparation; 2) preparing new aggregate and composite slurry according to the milling quality of the old asphalt pavement; 3) pre-mixing the new aggregate: mixing the new aggregate and the composite slurry uniformly to prepare wet aggregate; milling and mixing: milling old asphalt pavement according to the designed milling depth, spraying composite slurry into the milling material of the old asphalt pavement, and scattering wet aggregate to mix and regenerate in situ; 4) primary pressure shaping: performing initial pressing on the regeneration operation surface and shaping the regeneration operation surface on the flat ground; 5) pouring the composite slurry: pouring the composite slurry on the primary pressure operation surface, and vibrating, rolling and permeating; 6) rolling and forming; 7) and (5) preserving health. The road construction method does not need to spread cement, mineral powder and the like on a working surface, the loss of raw materials is less, the utilization rate of milling materials and external raw materials is high, and the mechanization degree of in-situ cold regeneration is higher; the obtained regeneration layer has low porosity, compact structure, fast development of early strength and high quality stability.
Description
Technical Field
The invention belongs to the technical field of road construction, and particularly relates to a road construction method for in-situ cold recycling of an asphalt pavement.
Background
The infrastructure construction and transportation industry of China experience a fierce high-speed development stage, and the high-grade highway construction mostly adopts asphalt pavement, so that the road has the advantages of safe driving, stability, comfort, low noise and the like. However, the service life of the asphalt pavement is usually 10-15 years, and more asphalt roads built in an early period enter the overhaul, renovation and reconstruction period or need to be rebuilt and expanded. In the process, the old asphalt pavement is milled and planed to generate a large amount of solid wastes, the treatment difficulty is high, the transportation cost is high, the occupied area is large, and the waste of resources is caused; how to recycle a large amount of pavement milling asphalt waste materials is a current hotspot.
The asphalt pavement regeneration construction process includes crushing the milled and recovered asphalt pavement material according to its grading size, adding certain amount of new aggregate, cement, mineral powder, asphalt and other material, and remixing for use in the base layer or lower layer of the pavement structure layer. The process has the advantages of high recycling rate of the waste milling and planing materials of the asphalt pavement, convenient construction, energy conservation, environmental protection, cost saving and the like, and is gradually applied to overhaul maintenance, overhaul reconstruction, reconstruction and extension of the asphalt pavement.
The asphalt pavement recycling construction process is mainly divided into four types of plant-mixed cold recycling, plant-mixed hot recycling, in-situ cold recycling and in-situ hot recycling in terms of actual application. The thermal regeneration process needs high-temperature mixing, and has the problems of large equipment investment, high cost investment and unstable quality, and is difficult to popularize in a large scale and a large range; the cold regeneration process is mixing at normal temperature, so that the cost is relatively low, the applicable pavement diseases are wide in types, the pollution is low, and the popularization and the use are easier; particularly, the in-situ cold recycling process has the advantages of in-situ regeneration, in-situ construction, capability of realizing one hundred percent recycling of the milled old materials, simplified construction procedure, high operation efficiency, energy conservation, emission reduction and low cost, suitability for large-scale construction and higher market competitiveness.
The in-situ cold regeneration of asphalt pavement is to directly carry out milling, recovery, mixing and paving on the mixture on the old asphalt pavement on site, and directly compact and form the pavement structure layer with the required bearing capacity. The currently common core flow is as follows: construction preparation → milling and watering → new feeding and paving → mixing and watering → rolling and molding → curing, or construction preparation → new feeding and paving → milling and watering mixing → rolling and molding → curing. From the view of the process, the latter combines the steps of milling the old pavement and adding water for mixing, thereby further simplifying the construction process, improving the operation efficiency and having higher mechanization degree. However, when new materials (including cement, mineral materials, etc.) are spread on a working surface in advance, the influence of weather is large during specific construction, the dust emission phenomenon is serious during wind operation under the condition of breeze or more, the dust emission and the material running cause air pollution and severe construction environment, and the material loss and the uneven spreading also cause the deviation of the mixture composition from the design, cause the unstable quality and the strength of a regeneration layer to be reduced, and are not favorable for the durability of the regeneration structure layer.
Disclosure of Invention
The invention aims to provide a road construction method for in-situ cold recycling of an asphalt pavement, which has the advantages of high utilization rate of raw materials, stable quality of a recycled layer and high strength.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a road construction method for in-situ cold recycling of asphalt pavements comprises the following steps:
1) construction preparation: cleaning a working surface, treating the base layer diseases of the original road and ensuring the smoothness of the road surface;
2) preparing materials: preparing new aggregate and composite slurry according to the quality of the old asphalt pavement milling material, wherein the composite slurry is mainly prepared by mixing emulsified asphalt, cement, redispersible latex powder, mineral admixture, aminosilane, auxiliary agent and additional water;
3) pre-mixing the new aggregate: uniformly mixing new aggregates with composite slurry to prepare wet aggregates, wherein the using amount of the composite slurry is 12-18% of the mass of the corresponding new aggregates;
milling and mixing: milling old asphalt pavement according to the designed milling depth, spraying composite slurry into the milling material of the old asphalt pavement, and scattering wet aggregate to mix and regenerate in situ; the dosage of the composite slurry is 8-12% of the mass of the milling material of the corresponding old asphalt pavement, and the dosage of the wet aggregate meets the requirement that the mass ratio of the new aggregate to the milling material of the corresponding old asphalt pavement is 10-30: 90-70;
4) primary pressure shaping: carrying out initial pressing on the regeneration operation surface, and then flattening and shaping;
5) pouring the composite slurry: pouring composite slurry on the primary pressing operation surface, and vibrating, rolling and permeating, wherein the using amount of the composite slurry is 4% -6% of the mass of the milling and planing material corresponding to the old asphalt pavement;
6) rolling and forming;
7) and (5) preserving health.
In the step 2), the new aggregates comprise coarse aggregates with the granularity of more than 2.36mm and fine aggregates with the granularity of less than 2.36mm, and the mass ratio of the coarse aggregates to the fine aggregates is 2-4: 1. Furthermore, the grain size of the coarse aggregate is 4.75-19mm, and the grain size of the fine aggregate is 0.60-2.36 mm. The milling material for old asphalt pavement is used as black aggregate, the aggregate is broken due to the long-term rolling and impact of vehicles, and the gradation is adjusted by adding new aggregate so that the gradation meets the standard requirement.
In the step 2), the composite slurry is mainly prepared by mixing the following raw materials in parts by weight: 4.0-5.5 parts of emulsified asphalt, 1.5-2.5 parts of cement, 0.4-0.6 part of redispersible latex powder, 0.5-1.5 parts of mineral admixture, 0.08-0.10 part of aminosilane, 0.1-0.3 part of auxiliary agent and 5-7 parts of external water.
Wherein the emulsified asphalt is slow-cracking or medium-cracking type cationic emulsified asphalt, and the water content is 35-45%.
The redispersible latex powder is water-soluble redispersible powder, and is an ethylene/vinyl acetate copolymer, and polyvinyl alcohol is taken as a protective colloid.
The mineral admixture is formed by mixing mineral powder, silica fume and fly ash according to the mass ratio of 3:1: 1. The particle size of the mineral admixture is not more than 0.075 mm.
The aminosilane is gamma-aminopropyltriethoxysilane.
The auxiliary agent comprises a stabilizer, an expanding agent and a water reducing agent. Preferably, the mass ratio of the stabilizer to the expanding agent to the water reducing agent in the auxiliary agent is 1:8: 1. Further preferably, the stabilizer is anhydrous calcium chloride; the expanding agent is a calcium sulphoaluminate type concrete expanding agent; the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent. The stabilizer has the functions of maintaining the stability of the emulsified asphalt, slowing down the demulsification speed of the emulsified asphalt and preventing the emulsified asphalt from being demulsified in advance when the composite slurry is prepared.
The preparation method of the composite slurry comprises the following steps: firstly, uniformly mixing cement, mineral admixture and auxiliary agent to obtain powder, adding redispersible latex powder and aminosilane into additional water to uniformly disperse the redispersible latex powder and the aminosilane into water to prepare an aqueous solution, and respectively storing the powder, the aqueous solution and emulsified asphalt; when in use, the powder is added into the water aqua and evenly mixed to prepare slurry, and the obtained slurry is mixed with the emulsified asphalt to prepare the composite slurry which is prepared on site.
And 3) milling by using a cold recycling machine at a milling speed of 4-8 m/min.
In the step 4), the rolling speed of the initial pressing is 1.0-1.5 km/h. The initial pressing is at least 2 times, and the degree of compaction of at least 1/3 thickness at the bottom of the regeneration layer reaches the specified requirement. The primary rolling 1 st pass is static rolling, and then static rolling or vibration rolling can be carried out. In the step 5), the speed of vibration rolling is 1.0-1.5 km/h. The vibration rolling is performed for at least 1 time.
In the step 6), the rolling forming comprises re-pressing and final pressing, and the rolling speed is 1.5-3.0 km/h. The number of times of the re-pressing is 4-8, the number of times of the final pressing is more than 4, and the compaction degree of the regeneration layer reaches the specified requirement.
In the step 7), the curing time is not less than 3 d. Preferably, curing for 3-5 days can be carried out, namely the next construction, namely asphalt surface layer paving.
The invention relates to a road construction method for in-situ cold regeneration of an asphalt pavement, which comprises the steps of preparing composite slurry in a material preparation step, wherein the composite slurry is prepared by mixing emulsified asphalt, cement, redispersible latex powder, mineral admixture, aminosilane, an auxiliary agent and additional water; the emulsified asphalt enhances the strength of the cold-recycling mixture through internal friction and cohesion, internal friction is generated by mutual embedding and squeezing of materials in the early stage, the emulsified asphalt is demulsified and water is evaporated after rolling the mixture, and asphalt wraps aggregates to form an asphalt film to generate cohesion. The adsorption effect of the cement and hydration products promote the demulsification of the emulsified asphalt, and the heat is emitted while the water is absorbed to accelerate the evaporation of the water, so that the strength is rapidly developed, and the early strength of the mixture is improved; simultaneously, the mineral admixture is used as a filler in cooperation with a mineral admixture, and the hydration reaction fills the pores of the mixture, so that the embedding and extrusion among aggregates are tighter, and the water stability, the crack resistance and the rutting resistance are improved; the unreacted cement particles and mineral admixture are free among aggregate pores in the form of particles to perform adsorption with the emulsified asphalt besides filling the pores to increase the strength, so that a film with adhesive property is formed, and the adhesion of the asphalt and the base material is improved, thereby improving the strength and the durability. A small amount of re-dispersible latex powder can obviously improve the workability, plasticity and flexibility of the composite slurry, prolong the operable time of the composite slurry, improve the bonding strength of the composite slurry and a regeneration layer and promote the early strength development of a mixture. A small amount of amino silane is used as a coupling agent, so that the interface contact between the emulsified asphalt and cement, a mineral admixture and aggregate is improved, the composite slurry is easier to spread, permeate and extend on the surface of the aggregate, the surface of a milling material and the pores of the mixture, the mixture is promoted to be uniformly mixed, the mixture is easy to compact and compact in structure, the porosity is reduced, and the strength, the water stability and the durability of a regeneration layer are improved.
The emulsified asphalt, the cement, the redispersible latex powder, the mineral admixture, the aminosilane, the assistant and the added water are mutually matched and have synergistic effect, so that the composite slurry has good workability, permeability and mixing property, is easy to spread on the surfaces of milling materials and new aggregates on old asphalt pavements, has strong cohesive force and quick development of early strength, ensures that a regeneration layer has a fine structure and has good strength and stability.
According to the road construction method for in-place cold recycling of the asphalt pavement, the new aggregate and the composite slurry are uniformly mixed in the step of premixing the new aggregate to prepare wet aggregate, and the composite slurry is adopted to pre-mix and pre-wet the new aggregate in advance, so that on one hand, the flowability and transportability of the new aggregate are improved through the composite slurry, the new aggregate is conveniently and uniformly spread to the milling material according to the composition design of the mixture, the wet aggregate is easy to mix and mix, and the mixing uniformity of the new aggregate, the milling material and the composite slurry is improved; on the other hand, the surface of the wet aggregate is coated with the composite slurry to form initial cohesive force, and the composite slurry is mixed with the milling material sprayed with the composite slurry during milling and mixing, so that the early strength development of the mixture is facilitated.
In the milling and mixing step, milling and mixing are synchronously carried out in a regeneration cover of a cold regenerator, composite slurry is sprayed into milling materials of the old asphalt pavement, wet aggregates are spread, and the wet aggregates are mixed and regenerated, so that the working efficiency and the mechanization degree are greatly improved. The cement, mineral admixture and the like prewet new aggregate in the form of composite slurry, spray the new aggregate to the milling material during mixing, are carried out in a relatively sealed container and a regeneration cover, are not influenced by rainy weather, windy weather and wind brought by traffic flow, have extremely little loss of raw materials, high utilization rate, and the composition ratio of the mixture is close to the theoretical design value to the maximum extent, and are easy to construct and control the quality. However, due to the limitation of the stirring degree and time of milling and mixing in situ, when the amount of the sprayed composite slurry is large, the phenomena of liquid seepage and bottom slipping easily occur in the mixture, namely, the concentration of the slurry at the bottom of the regeneration layer mixture is higher than that at the upper part, a small amount of slurry is deposited at the bottom, and the uniformity and the bonding strength at the upper part are influenced. So that the composite slurry with the total amount of 2/3 is milled, mixed and sprayed on the spot, the regeneration operation surface is initially pressed, and then the flat ground is shaped; pouring the residual 1/3 composite slurry on the primary pressure operation surface, and vibrating, rolling and permeating; the consumption of the composite slurry which is milled, mixed and sprayed on the spot is reduced, and the composite slurry is prevented from depositing at the bottom; and pouring the residual composite slurry to an initial pressing working surface after initial pressing (the compaction degree of at least 1/3 thickness at the bottom of the regeneration layer reaches the specified requirement), wherein the composite slurry permeates into pores of the regeneration layer to supplement the loss of concentration at the upper part of the regeneration layer, so that the uniformity of the mixture and the bonding strength at the upper part of the regeneration layer are improved, and the uniformity and the enhancement of the overall strength are achieved.
The road construction method for in-situ cold recycling of the asphalt pavement combines the high-performance composite slurry which is easy to permeate and mix with the corresponding special construction process, the high-performance composite slurry and the corresponding special construction process complement each other, the powder materials such as cement, mineral powder and the like do not need to be spread on the working surface before or after milling, the construction process is not influenced by wind weather and wind brought by the traffic flow, the loss of raw materials is less, the utilization rate of milling materials and additional raw materials of the old asphalt pavement is high, and the mechanization degree of in-situ cold recycling is higher. The obtained regeneration layer is easier to compact, low in porosity, compact in structure, fast in early strength development and short in curing period, and can be used for carrying out next construction more quickly and shortening the construction period; the regenerated layer has small deviation with the theoretical design of the mixture, high quality stability, good strength and durability, meets the construction requirements, and is suitable for popularization and use.
Detailed Description
The road construction method of the present invention for cold in-place recycling of asphalt pavement will be further described below by taking a certain asphalt pavement renovation project as an example. The structure layer of the old asphalt pavement is as follows: 10cm of asphalt surface layer, 20cm of cement stabilized macadam base layer and 20cm of graded macadam subbase layer; the pavement regeneration scheme is as follows: 10cm of asphalt surface layer, 14cm of emulsified asphalt cold-regenerated upper base layer, 20cm of cement stabilized macadam base layer and 20cm of graded macadam subbase layer; and designing milling depth of 10cm, namely regenerating an old asphalt surface layer as an upper base layer, and paving the asphalt surface layer again.
The compaction degree and deflection of the asphalt road subgrade are qualified, and all indexes meet the design specification and construction requirements. The milling and planing material of the old asphalt pavement in the test area is detected before construction, and the water content is less than or equal to 1.5 percent, the asphalt content is 4.7 percent, and the sand equivalent is 64 percent.
In a specific embodiment, the method for constructing a cold-in-place recycled asphalt pavement of example 1 comprises the following steps:
1) construction preparation: cleaning the working surface, removing sundries and accumulated water on the working surface, treating basic road diseases (such as cracks, deep pits, ruts and the like) and ensuring the smoothness of the road surface;
2) preparing materials: the average mass of the milling and planing material of the old asphalt pavement in unit area is obtained according to milling, measuring and calculating of the old asphalt pavement in a test area, and new aggregate and composite slurry are prepared according to the working surface area and the following dosage ratio; the used materials all meet the design specifications and construction requirements;
the composite slurry is prepared by mixing the following raw materials in parts by weight: 5.0 parts of emulsified asphalt, 2.0 parts of PO42.5R early strength cement, 0.5 part of redispersible latex powder, 1.0 part of mineral admixture, 0.08 part of gamma-aminopropyltriethoxysilane, 0.2 part of auxiliary agent (the mass ratio of the stabilizer, the expanding agent and the water reducing agent is 1:8:1) and 6.22 parts of additional water; wherein the emulsified asphalt is slow-breaking quick-setting type cation emulsified asphalt (BH-MK), and the water content is 40%; the redispersible latex powder is water-soluble redispersible powder, is an ethylene/vinyl acetate copolymer, and takes polyvinyl alcohol as a protective colloid; the mineral admixture is formed by mixing mineral powder, silica fume and fly ash according to the mass ratio of 3:1: 1; the stabilizer is anhydrous calcium chloride; the expanding agent is a calcium sulphoaluminate type concrete expanding agent; the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent;
when the material is prepared, cement, mineral admixture and auxiliary agent are mixed uniformly to obtain powder, redispersible latex powder and aminosilane are added into added water to be dispersed uniformly to prepare aqueous solution, and the powder, the aqueous solution and emulsified asphalt are stored and prepared respectively; when in use, the powder is added into the water aqua and evenly mixed to prepare slurry, and the obtained slurry is mixed with the emulsified asphalt to prepare composite slurry which is prepared on site;
3) pre-mixing the new aggregate: uniformly mixing new aggregate and composite slurry to prepare wet aggregate, wherein the using amount of the composite slurry is 15% of the mass of the new aggregate; the new aggregate is prepared by mixing coarse aggregate with the granularity of more than 2.36mm and fine aggregate with the granularity of less than 2.36mm, and the mass ratio of the coarse aggregate to the fine aggregate is 3: 1;
milling and mixing: the cold recycling machine is provided with a first pipeline for conveying the composite slurry and a second pipeline for conveying the wet aggregate, the tail ends of the first pipeline and the second pipeline are both arranged in a recycling cover of the cold recycling machine and are aligned with milling materials, and the tail ends of the first pipeline and the second pipeline are both provided with distributing devices, so that the composite slurry is uniformly sprayed, and the wet aggregate is uniformly spread; the material distribution device of the first pipeline is positioned in front of the material distribution device of the second pipeline along the advancing direction of the cold recycling machine;
milling old asphalt pavement according to the designed milling depth by adopting the cold recycling machine, wherein the milling speed is 6m/min, spraying composite slurry into milling materials of the old asphalt pavement, and spreading wet aggregate to mix and regenerate in situ;
the dosage of the composite slurry is 10% of the mass of the milling material corresponding to the old asphalt pavement, and the dosage of the wet aggregate meets the requirement that the mass ratio of the new aggregate to the old asphalt pavement is 20: 80;
4) primary pressure shaping: carrying out static pressure primary pressing on a regeneration operation surface for 1 time by using a 12t medium-sized road roller, carrying out vibration rolling for 1 time, carrying out more pressing on two sides of the road for 2 times until the compaction degree of at least 1/3 thickness at the bottom of a regeneration layer reaches the specified requirement, wherein the rolling speed is 1.5km/h, and then, carrying out land leveling and shaping by using a grader;
5) pouring the composite slurry: uniformly spraying and pouring composite slurry on the primary pressing operation surface, enabling the composite slurry to permeate into the regeneration layer, and carrying out vibration rolling for 1 time by using a 12t medium-sized road roller to enable the slurry to fully permeate, wherein the rolling speed is 1.5 km/h; the using amount of the composite slurry is 5% of the mass of the milling material corresponding to the old asphalt pavement;
6) rolling and forming: carrying out re-pressing for 6 times by using a 16t heavy road roller, wherein the re-pressing is vibration rolling, and the rolling speed is 2.5 km/h; then, carrying out final pressing for 4 times by using a 16t heavy road roller, wherein the rolling speed is 2.5km/h, and the compactness of the regeneration layer reaches the specified requirement (the compactness is more than or equal to 95%);
7) after the mixture is cured for 3d, the regenerated layer is qualified.
In a specific embodiment, the difference between the road construction method of cold-in-place recycling of asphalt pavement of other examples and example 1 is shown in table 1, and the rest is the same as example 1.
Table 1 material proportions for the road construction methods of examples 2, 3
The core drilling of the regeneration layer is sampled according to the requirements, the performance is detected, and the result is averaged, which is shown in table 2.
TABLE 2 results of testing the properties of the regenerated layers obtained by the road construction methods of examples 1 to 3
As can be seen from Table 2, the asphalt road pavement of examples 1 to 3 was subjected to cold in-place recycling to provide a recycled layer having a bulk density of 2.294 to 2.327g/cm3Within the range, after curing for 3 days, the dry splitting strength at 15 ℃ is not lower than 0.75MPa, the dry-wet splitting strength ratio is more than 90.67%, the freeze-thaw splitting residual strength ratio is more than 84.51%, the early strength is well developed, and the strength of a regeneration layer is high; the Marshall stability is between 13.83 and 14.57kN, the residual stability is between 94.90 and 96.18 percent, and the dynamic stability is between 5992 and 6823 times/mm, which are all higher than the specified requirements. The detection result shows that the regenerated layer obtained by the road construction method has good strength, high-temperature stability, water stability andthe anti-rutting performance, stable quality, good durability and meeting the construction requirements.
Claims (7)
1. A road construction method for in-situ cold recycling of asphalt pavements is characterized by comprising the following steps: the method comprises the following steps:
1) construction preparation: cleaning a working surface, treating base layer diseases of the original pavement and ensuring the pavement to be flat;
2) preparing materials: preparing new aggregate and composite slurry according to the quality of the old asphalt pavement milling material, wherein the composite slurry is mainly prepared by mixing emulsified asphalt, cement, redispersible latex powder, mineral admixture, aminosilane, auxiliary agent and additional water;
the composite slurry is mainly prepared by mixing the following raw materials in parts by weight: 4.0-5.5 parts of emulsified asphalt, 1.5-2.5 parts of cement, 0.4-0.6 part of redispersible latex powder, 0.5-1.5 parts of mineral admixture, 0.08-0.10 part of aminosilane, 0.1-0.3 part of auxiliary agent and 5-7 parts of external water; the mineral admixture is formed by mixing mineral powder, silica fume and fly ash according to the mass ratio of 3:1: 1;
3) pre-mixing the new aggregate: uniformly mixing new aggregates with composite slurry to prepare wet aggregates, wherein the using amount of the composite slurry is 12-18% of the mass of the corresponding new aggregates;
milling and mixing: milling old asphalt pavement according to the designed milling depth, spraying composite slurry into the milling material of the old asphalt pavement, and scattering wet aggregate to mix and regenerate in situ; the dosage of the composite slurry is 8-12% of the mass of the milling material corresponding to the old asphalt pavement, and the mass ratio of the new aggregate to the milling material corresponding to the old asphalt pavement in the wet aggregate is 10-30: 90-70;
4) primary pressure shaping: performing initial pressing on the regeneration operation surface and shaping the regeneration operation surface on the flat ground;
5) pouring the composite slurry: pouring composite slurry on the primary pressing operation surface, and vibrating, rolling and permeating, wherein the using amount of the composite slurry is 4% -6% of the mass of the milling and planing material corresponding to the old asphalt pavement;
6) rolling and forming;
7) and (5) preserving health.
2. The method for constructing a cold-in-place recycling road of an asphalt pavement according to claim 1, which comprises the steps of: in the step 2), the new aggregates comprise coarse aggregates with the granularity of more than 2.36mm and fine aggregates with the granularity of less than 2.36mm, and the mass ratio of the coarse aggregates to the fine aggregates is 2-4: 1.
3. The road construction method of cold-in-place recycling of asphalt pavement according to claim 1 or 2, characterized in that: the aminosilane is gamma-aminopropyltriethoxysilane.
4. The method for constructing a cold-in-place recycling road of an asphalt pavement according to claim 1, which comprises the steps of: and 3) milling by using a cold recycling machine at a milling speed of 4-8 m/min.
5. The method for constructing a cold-in-place recycling road of an asphalt pavement according to claim 1, which comprises the steps of: in the step 4), the rolling speed of the initial pressing is 1.0-1.5 km/h; in the step 5), the speed of vibration rolling is 1.0-1.5 km/h.
6. The method for constructing a cold-in-place recycling road of an asphalt pavement according to claim 1, which comprises the steps of: in the step 6), the rolling forming comprises re-pressing and final pressing, and the rolling speed is 2.0-4.0 km/h.
7. The method for constructing a cold-in-place recycling road of an asphalt pavement according to claim 1, which comprises the steps of: in the step 7), the curing time is not less than 3 d.
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| CN114163187A (en) * | 2021-11-24 | 2022-03-11 | 汇通建设集团股份有限公司 | Emulsified asphalt plant-mixed cold-recycling mixture and construction process thereof |
| CN115745490A (en) * | 2022-11-22 | 2023-03-07 | 东南大学 | Rubber wheel emulsified asphalt surface layer anti-sticking isolating agent and preparation method thereof |
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