CN111560818B - Foamed asphalt pavement regeneration material capable of reducing cracking and preparation and construction methods thereof - Google Patents
Foamed asphalt pavement regeneration material capable of reducing cracking and preparation and construction methods thereof Download PDFInfo
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- CN111560818B CN111560818B CN202010316693.0A CN202010316693A CN111560818B CN 111560818 B CN111560818 B CN 111560818B CN 202010316693 A CN202010316693 A CN 202010316693A CN 111560818 B CN111560818 B CN 111560818B
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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
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C19/1004—Reconditioning or reprocessing bituminous mixtures, e.g. salvaged paving, fresh patching mixtures grown unserviceable; Recycling salvaged bituminous mixtures; Apparatus for the in-plant recycling thereof
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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
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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
- C04B28/02—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
- C04B28/08—Slag cements
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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
- C04B28/02—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
- C04B28/08—Slag cements
- C04B28/082—Steelmaking slags; Converter slags
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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
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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
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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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- Ceramic Engineering (AREA)
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- Civil Engineering (AREA)
- Materials Engineering (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention provides a foamed asphalt pavement regenerative material capable of reducing cracking and a preparation and construction method thereof, relating to the technical field of highways and municipal engineering, wherein the material has higher strength and lower shrinkage cracking rate, thereby improving the integral bearing capacity of the foamed asphalt regenerative material as a base layer or a lower surface layer and prolonging the service life of the pavement; the material comprises the following components: 85-100 parts of asphalt pavement recycling material, 5-10 parts of crushed stone, 3-5 parts of fine aggregate, 2-3 parts of foamed asphalt, 4-5 parts of water, 1-2 parts of slag sulphoaluminate and/or iron aluminate cement and 0.1-0.5 part of fiber; the preparation can adopt a plant mixing method or a cold in-place recycling and on-site mixing method. The technical scheme provided by the invention is suitable for the process of paving or renovating the foamed asphalt pavement.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of highways and municipal engineering, in particular to a foamed asphalt pavement regeneration material capable of reducing cracking and a preparation and construction method thereof.
[ background of the invention ]
The highway construction in China develops rapidly, and according to the estimation of 15-20 years of the design service life of asphalt, about 12% of asphalt pavements need to be renovated every year from now on, and the asphalt pavement will also increase at a speed of 15% every year. If the waste materials are completely recycled, the material cost can be saved by 120 billion yuan each year, and the generated environmental benefit is more huge. The cold regeneration technology can effectively solve the problem of resource waste, and can save the total investment by 40 to 50 percent compared with other traditional construction methods. However, the technology is mostly used for the base course of low-grade roads at present, the utilization rate of waste materials is low, and the economic benefit brought by the technology is undoubtedly huge if the cold regeneration technology can be smoothly introduced into the reconstruction of the first-grade and second-grade roads in China.
The cold regeneration construction process of the foamed asphalt is efficient, the utilization rate of the regenerated aggregate on the pavement is high, the cold regeneration technology of the foamed asphalt is constructed at normal temperature, the asphalt does not need to be heated, and the performance attenuation caused by the high-temperature aging of the asphalt is avoided, so that the fatigue resistance of the pavement is improved, and the service life of the pavement is prolonged. Meanwhile, the technology can accurately control the thickness of the paving layer, improve the service performance of the pavement and improve the grade of the old road without damaging the roadbed. In the treatment of asphalt pavement rutting, load cracks, non-load cracks and other diseases and pavement overhaul projects, the problems of poor early bonding property of strength formation, loose aggregate, insufficient threshing, poor stability and the like still exist among the existing foamed asphalt in-situ cold recycled mixtures.
Accordingly, there is a need to develop a reduced cracking foamed asphalt pavement recycling material and methods of making and constructing the same that address the deficiencies of the prior art to address or mitigate one or more of the problems set forth above.
[ summary of the invention ]
In view of the above, the invention provides a foamed asphalt pavement recycled material with reduced cracking and a preparation and construction method thereof, which have higher strength and lower shrinkage cracking rate, thereby improving the overall bearing capacity of the foamed asphalt recycled material as a base layer or a lower surface layer and prolonging the service life of a pavement.
In one aspect, the invention provides a foamed asphalt pavement regenerative material capable of reducing cracking, which is characterized in that the material comprises the following components: 85-100 parts of asphalt pavement recycling material, 5-10 parts of macadam, 3-5 parts of fine aggregate, 2-3 parts of foamed asphalt, 4-5 parts of water, 1-2 parts of steel slag cement and/or slag cement and 0.1-0.5 part of fiber.
The above aspects and any possible implementations further provide an implementation in which the slag cement is a slag sulfoaluminate and/or a ferroaluminate cement;
the slag sulphoaluminate or ferroaluminate cement comprises the following components in parts by weight: 75-90 parts of granulated blast furnace slag, 3-5 parts of sulphoaluminate or ferroaluminate cement clinker and 3-15 parts of gypsum;
the initial setting time of the slag sulphoaluminate or ferro-aluminate cement is more than or equal to 6 hours, the final setting time is less than or equal to 10 hours, the 7-day linear expansion rate is more than or equal to 0.15 percent, and the 28-day free expansion rate is less than or equal to 1.0 percent.
The above aspects and any possible implementations further provide an implementation in which the sulfoaluminate or aluminoferrite cement clinker has a 28d compressive strength of greater than or equal to 50 MPa.
The above aspects and any possible implementation further provide an implementation, wherein the steel slag cement is steel slag sulphoaluminate cement; the steel slag sulphoaluminate cement comprises the following components: 75-90 parts of granulated blast furnace steel slag, 3-5 parts of sulphoaluminate cement clinker and 3-15 parts of gypsum.
The above aspects and any possible implementation manner further provide an implementation manner, and the preparation method of the foamed asphalt comprises: the asphalt with the temperature of 160-180 ℃ and the water with the temperature of 15-30 ℃ generate heat exchange to form steam, the steam is pressed into the continuous phase of the asphalt under the preset air pressure, and the asphalt is sprayed out and cooled to obtain the asphalt.
The above aspects and any possible implementations further provide an implementation in which the fibers are one or more of organic fibers, polymer fibers, basalt fibers, and recycled fibers.
The above aspect and any possible implementation further provides an implementation in which the fine aggregate has a particle size of <3mm, and the crushed stone has a particle size of 10-20 mm.
On the other hand, the invention provides a preparation method of the recycled material for reducing cracking of the foamed asphalt pavement, which is characterized in that the preparation method is a plant mixing method; the plant mixing method comprises the following steps:
s1, weighing the raw material components according to the component proportion of the recycled material;
and S2, uniformly stirring the recycled asphalt pavement material, the crushed stone, the foamed asphalt, the slag sulphoaluminate and/or ferroaluminate cement, the fiber and the water by using a stirring device at room temperature to obtain the foamed asphalt cold pavement recycled material.
In still another aspect, the invention also provides a preparation method of the recycled material for reducing cracking of the foamed asphalt pavement, which is characterized in that the preparation method is a method of mixing in-situ cold recycling; the step of mixing in-situ cold regeneration comprises the following steps:
s1, scattering the broken stone, the fine aggregate, the slag sulphoaluminate and/or the ferro-aluminate cement and the fiber on the road surface according to the component proportion of the recycled material;
s2, regenerating and mixing the pavement by utilizing a regeneration device, fully mixing the asphalt pavement recycling material paved on the pavement with the crushed stone, the fine aggregate, the slag sulphoaluminate and/or the iron aluminate cement and the fiber, and adding the foamed asphalt and the water according to the proportion in the mixing process to obtain the foamed asphalt pavement recycling material.
The above aspects and any possible implementation further provide an implementation manner that the recycling device adopts an undercutting construction method to ensure uniform gradation of the obtained asphalt pavement recycled material.
In the above aspect and any possible implementation manner, there is further provided an implementation manner that, when adding foamed asphalt and water in S2, the simultaneous addition or the water and the foamed asphalt are added first, so as to ensure that the water has sufficient lubricating effect on the foamed asphalt.
In a further aspect, the invention provides a construction method of a recycled foamed asphalt pavement material for reducing cracking, which is characterized in that the recycled material is adopted to pave a pavement; the construction method comprises the steps of paving, rolling and curing;
paving: paving the base material by adopting paving equipment with paving power not lower than 120kW, wherein the paving thickness is 8-15cm after single-layer rolling; the two adjacent construction sections are longitudinally overlapped by 30-40 cm;
rolling: the method comprises the steps of initial pressing, secondary pressing and final pressing; firstly, carrying out 2-3 back-and-forth static pressures on the road surface by using rolling equipment with the effect equal to that of a double-steel-wheel road roller, namely primary pressure; then heavy vibration rolling equipment with the exciting force larger than 35t, 18-21t three-wheel rolling equipment or tire rolling equipment with the exciting force more than 25t are used for continuously rolling and compacting, namely re-rolling; finally, static pressure of rolling equipment or rubber wheel rolling equipment with the same effect as that of the double-steel-wheel road roller is adopted to eliminate wheel tracks, namely final pressure is obtained;
health preserving: after finishing rolling on each section of pavement and checking the compactness to be qualified, immediately starting to maintain; natural health preserving is adopted; the life span is not less than 3 days.
Compared with the prior art, the invention can obtain the following technical effects: the foamed asphalt recycled mixture capable of reducing cracking has higher strength and lower shrinkage cracking rate, so that the overall bearing capacity and the service life of the pavement when the foamed asphalt recycled material is used as a base layer or a lower surface layer are improved, and the foamed asphalt recycled mixture can be used for building long-life asphalt pavements of semi-rigid base layers.
Of course, it is not necessary for any one product in which the invention is practiced to achieve all of the above-described technical effects simultaneously.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a composition diagram of a reduced cracking foamed asphalt pavement recycling material provided by an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The problems of poor early bonding property of strength formation, loose aggregate, threshing, insufficient stability and the like existing among cold recycled mixtures in the prior art are mainly related to the preparation of foamed asphalt, the grading of recycled materials and the cement performance.
The invention provides a low-cracking foamed asphalt pavement regenerative material, which uses novel slag sulphoaluminate cement and fiber foamed asphalt pavement regenerative material to improve the tensile property and toughness of the material, enhance the ductility of the material, and improve the anti-shrinkage cracking capability of the regenerative material so as to avoid or reduce the early-stage damage phenomenon of the pavement; has great significance in the aspects of environmental protection and quality control.
The low-cracking foamed asphalt pavement recycled material comprises the following components: 85-100 parts of asphalt pavement recycling material (RAP), 5-10 parts of macadam, 3-5 parts of fine aggregate, 2-3 parts of foamed asphalt, 4-5 parts of water, 1-2 parts of cement and 0.1-0.5 part of fiber by mass, as shown in figure 1. Wherein the particle size of the fine aggregate is less than 3mm, and the particle size of the broken stone is 10-20 mm.
The asphalt pavement recycling material (RAP) refers to a crushed stone material recycled after milling and crushing an original old asphalt pavement. The recycling can be realized by a local recycling machine, or the milled powder can be transported back to a mixing plant for recycling.
The cement is slag sulphoaluminate cement and/or steel slag cement. The slag sulphoaluminate (ferro) cement comprises the following main components in percentage by weight: 75-90 parts of granulated blast furnace slag, 3-5 parts of sulphoaluminate cement clinker and 3-15 parts of gypsum. The above-mentioned sulphoaluminate cement has a mark number of above 42.5, and the cement clinker strength is greater than or equal to 50MPa (28d compressive strength). The initial setting time of the combined slag sulphoaluminate cement is more than or equal to 6 hours, the final setting time is less than or equal to 10 hours, the 7-day linear expansion rate is more than or equal to 0.15 percent, and the 28-day free expansion rate is less than or equal to 1.0 percent.
The steel slag cement can be steel slag sulphoaluminate cement, is used for replacing slag sulphoaluminate cement and slag ferroaluminate cement in a foamed asphalt pavement regeneration material, and has the same components as the slag cement. The steel slag sulphoaluminate cement comprises the following components: 75-90 parts of granulated blast furnace steel slag, 3-5 parts of sulphoaluminate cement clinker and 3-15 parts of gypsum.
The foamed asphalt is obtained by performing heat exchange between asphalt with the temperature of 160-180 ℃ and water with the temperature of 15-30 ℃ to form steam, pressing the steam into a continuous phase of the asphalt under a preset air pressure, and spraying the asphalt. Wherein, the asphalt with the temperature of 160-180 ℃ and the water with the temperature of 15-30 ℃ are mixed in the foaming cavity, the high-temperature asphalt and the low-temperature water generate heat exchange, the low-temperature water is heated and vaporized to form steam, and the asphalt is cooled at the same time. The steam is pressed into the continuous phase of the asphalt under the action of the preset air pressure, and the asphalt with the lowered temperature forms foamed asphalt after the asphalt pressed into the steam is sprayed.
The fibers used include organic fibers, polymer fibers, basalt fibers, and/or recycled fibers, among others. The fibers mainly play a role in reinforcing the ribs. The fibers are uniformly dispersed in the in-situ cold recycled foamed asphalt mixture and can bear the shearing action formed in the running process of a vehicle, so that the shearing resistance of the in-situ cold recycled foamed asphalt mixture is improved, and the in-situ cold recycled foamed asphalt mixture can be prevented from generating larger cracks under the action of external force. The regenerated fiber is obtained by recycling, cleaning and crushing waste fibers; the regenerated fiber is one or more of regenerated woven bag fiber, regenerated glass fiber and regenerated polyester fiber.
1. Mixing the foamed asphalt recycled mixture: the foamed asphalt recycled mixture can be mixed on the spot cold recycling site, and can also be mixed in a plant.
The concrete flow of plant mixing is as follows:
(1) weighing the raw material components according to the requirements of the components of the mixture;
(2) RAP, macadam, foamed asphalt, cement, fiber and water are uniformly stirred by a special mixing device at room temperature to obtain the foamed asphalt cold recycling mixture.
The in-situ cold regeneration on-site mixing process comprises the following specific steps:
the method comprises the following steps of scattering crushed stone, fine aggregate, cement and mineral fiber on a road surface according to the parts by weight, performing regeneration mixing on the road surface by utilizing regeneration equipment to fully mix old materials of the asphalt mixture with the crushed stone, the fine aggregate, the cement and the mineral fiber, and adding foamed asphalt and water in the process of performing regeneration mixing to form a cold-in-place regenerated foamed asphalt mixture; and spreading and rolling the in-situ cold recycled foamed asphalt mixture.
Wherein, the broken stones and the fine aggregates are spread by a broken stone spreader; spreading cement by using a cement spreader, wherein when the cement is spread, the space between two sides of a construction sideline is 12-15cm respectively in order to avoid flying to pollute the construction environment after the cement is spread; the fibers are spread by using a spreading vehicle.
In addition, existing road surfaces are milled by the reclaimer. The regenerator adopts an undercut construction method to ensure the even gradation of the obtained old asphalt mixture. And (4) milling and mixing the existing pavement together with crushed stones, fine aggregates, cement and mineral fibers according to the design result of the mixing proportion. Because the viscosity of the foamed asphalt is reduced, the foamed asphalt can be better mixed with the crushed stone and the fine aggregate under the lubricating action of water, the foamed asphalt can be uniformly coated on the surface of the fine aggregate in the process of regeneration and mixing, and the foamed asphalt coated with the fine aggregate forms spot welding with the crushed stone and the old asphalt mixture.
When the cold regeneration foam asphalt mixture is paved, an asphalt mixture paver is recommended to be adopted for paving, and a paver screed does not need to be heated. When rolling, all processes are closely connected, and the time from mixing to finishing rolling is shortened. After rolling, the compacted pavement is aired and cured for 1-3 days, and water in the in-situ cold recycled foam asphalt mixture is evaporated, so that the pavement obtains certain early strength. Under the vehicle-mounted action, the strength of the in-situ cold recycled foamed asphalt mixture is higher and higher.
2. Paving the foamed asphalt recycled mixture, and taking the following matters into consideration:
A) the mixture is paved to ensure enough thickness, the paving thickness of each layer is not less than 8cm (the thickness after rolling and forming), and the maximum thickness is not more than 15 cm.
B) And after the construction quality of the lower bearing layer is detected to be qualified, the upper structural layer can be paved. When two-layer continuous paving is adopted, when the quality of the lower layer is in problem, the upper layer is processed at the same time.
C) And paving the mixture by adopting an asphalt concrete paver or a stable material paver with the paving power not lower than 120 kW.
D) And when two spreading machines are adopted for parallel spreading, the models and the delivery periods of the two spreading machines are the same. During construction, the distance between the front part and the rear part of the two pavers is not more than 10m, and the longitudinal overlapping of the two construction sections by 30-40cm is ensured.
E) Specially-assigned persons are arranged behind the spreading machine to eliminate the segregation phenomenon of coarse and fine aggregates, and particularly, local coarse aggregate pits are removed and filled with a newly-mixed mixture.
F) In order to reduce waste and facilitate edge rolling, the formwork is suitable to be erected longitudinally.
3. Rolling the paved foamed asphalt recycled mixture, and taking the following matters into consideration:
A) and in order to ensure the rolling quality of the material, the rolling process is finished before the initial setting of the cement.
B) And in order to ensure the rolling effect, a construction unit is provided with enough rolling equipment. For a bidirectional four-lane highway or a first-level highway, at least 4 heavy road rollers are needed for half-width paving; for the half-width paving of the bidirectional six lanes, at least 5 heavy-duty road rollers are needed.
C) Generally divided into initial pressure, secondary pressure and final pressure; firstly, carrying out 2-3 back-and-forth static pressures on the road surface by using rolling equipment with the effect equal to that of a double-steel-wheel road roller, namely primary pressure; then heavy vibration rolling equipment with the exciting force larger than 35t, 18-21t three-wheel rolling equipment or tire rolling equipment with the exciting force more than 25t are used for continuously rolling and compacting, namely re-rolling; and finally, static pressure of rolling equipment or rubber wheel rolling equipment with the same effect as that of the double-steel-wheel road roller is adopted to eliminate wheel tracks, namely final pressure is obtained.
D) And if a spring phenomenon is found in the rolling process, digging out the mixed material on the road section, and replacing new filling materials for rolling again.
E) The surface after rolling and forming should be flat and have no wheel tracks.
4. The rolled pavement is maintained, and the following matters should be taken into consideration:
A) and after finishing rolling of each section and passing the compaction degree inspection, immediately starting curing. Natural health preserving is adopted.
B) The life-preserving period is not less than 3 days. For the roads at the second level and below the second level, if the curing period is less than 3d, namely an asphalt surface course is paved, the heavy vehicles are limited to pass.
Specific road performance criteria are shown in table 1.
TABLE 1 road Performance index
Actual measurement item | Technical requirements |
Marshall stability (KN) at 40 DEG C | ≥14 |
Dry split strength at 15 ℃ (MPa) | ≥0.65 |
Residual stability (%) | ≥75 |
Freeze-thaw split strength ratio (%) | ≥70 |
Degree of dynamic stability (times/mm) | ≥3000 |
After the technical scheme is adopted, the foamed asphalt recycled material with high compressive strength and high flexural strength can be obtained, is suitable for recycling various grades of pavements, builds a long-life pavement, and can improve the bearing capacity of the pavement structure and prolong the service life of the pavement structure.
The foamed asphalt pavement regeneration material for reducing cracking and the preparation and construction method thereof provided by the embodiment of the application are described in detail above. The above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
As used in the specification and claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (9)
1. A foamed asphalt pavement recycling material with reduced cracking, the material comprising the following components: 85-100 parts of asphalt pavement recycling material, 5-10 parts of macadam, 3-5 parts of fine aggregate, 2-3 parts of foamed asphalt, 4-5 parts of water, 1-2 parts of steel slag cement and/or slag cement and 0.1-0.5 part of fiber;
the slag cement is slag sulphoaluminate and/or ferroaluminate cement;
the slag sulphoaluminate or ferroaluminate cement comprises the following components in parts by weight: 75-90 parts of granulated blast furnace slag, 3-5 parts of sulphoaluminate or ferroaluminate cement clinker and 3-15 parts of gypsum;
the initial setting time of the slag sulphoaluminate or ferro-aluminate cement is more than or equal to 6 hours, the final setting time is less than or equal to 10 hours, the 7-day linear expansion rate is more than or equal to 0.15 percent, and the 28-day free expansion rate is less than or equal to 1.0 percent.
2. The cracking-reducing foamed asphalt pavement recycling material of claim 1, wherein the sulfoaluminate or aluminoferrite cement clinker has a 28d compressive strength of 50MPa or more.
3. The foamed asphalt pavement regenerative material capable of reducing cracking of claim 1, wherein the foamed asphalt is prepared by the following steps: the asphalt with the temperature of 160-180 ℃ and the water with the temperature of 15-30 ℃ generate heat exchange to form steam, the steam is pressed into the continuous phase of the asphalt under the preset air pressure, and the asphalt is sprayed out and cooled to obtain the asphalt.
4. The reduced cracking foamed asphalt pavement recycling material of claim 1, wherein the fibers are one or more of organic fibers, polymer fibers, basalt fibers, and recycled fibers.
5. The crack reduction foamed asphalt pavement recycling material as claimed in claim 1, wherein said fine aggregate has a grain size <3mm and said crushed stone has a grain size of 10-20 mm.
6. The preparation method of the foamed asphalt pavement recycled material capable of reducing cracking is characterized by being a plant mixing method; the plant mixing method comprises the following steps:
s1, weighing the raw material components according to the component proportion of the recycled material as claimed in any one of claims 1 to 5;
and S2, uniformly stirring the recycled asphalt pavement material, the crushed stone, the foamed asphalt, the slag sulphoaluminate and/or ferroaluminate cement, the fiber and the water by using a stirring device at room temperature to obtain the foamed asphalt cold pavement recycled material.
7. The preparation method of the foamed asphalt pavement regenerative material for reducing cracking is characterized in that the preparation method is a cold in-place regeneration on-site mixing method; the step of mixing in-situ cold regeneration comprises the following steps:
s1, scattering the broken stone, the fine aggregate, the slag sulphoaluminate and/or the ferro-aluminate cement and the fiber on the road surface according to the component proportion of the recycled material of any one of claims 1 to 5;
s2, regenerating and mixing the pavement by utilizing a regeneration device, fully mixing the asphalt pavement recycling material paved on the pavement with the crushed stone, the fine aggregate, the slag sulphoaluminate and/or the iron aluminate cement and the fiber, and adding the foamed asphalt and the water according to the proportion in the mixing process to obtain the foamed asphalt pavement recycling material.
8. The method for preparing the foamed asphalt pavement recycled material capable of reducing cracking according to claim 7, wherein the recycling equipment adopts an undercutting construction method to ensure that the grading of the obtained asphalt pavement recycled material is uniform;
when the foamed asphalt and the water are added in the S2, the simultaneous addition or the addition of the water and the foamed asphalt is selected to ensure that the lubricating effect of the water on the foamed asphalt is sufficient.
9. A construction method of a recycled material for reducing cracking of a foamed asphalt pavement, which is characterized in that the recycled material of any one of claims 1 to 5 is adopted for pavement; the construction method comprises the steps of paving, rolling and curing;
paving: paving the base material by adopting paving equipment with paving power not lower than 120kW, wherein the paving thickness is 8-15cm after single-layer rolling; the two adjacent construction sections are longitudinally overlapped by 30-40 cm;
rolling: dividing into initial pressure, secondary pressure and final pressure; the initial pressing is static pressing for 2-3 times by adopting a rolling device; the re-pressing is to use vibration rolling equipment or heavy rolling equipment to roll and compact; the final pressing is to adopt a double-steel wheel rolling device or a rubber wheel rolling device to carry out static pressure so as to eliminate wheel tracks;
health preserving: after finishing rolling on each section of pavement and checking the compactness to be qualified, immediately starting to maintain; the life span is not less than 3 days.
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CN114292066B (en) * | 2021-12-17 | 2023-07-07 | 长安大学 | High-strength foam asphalt cold-recycling mixture and preparation method and application thereof |
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