CN114525707B - Composite pavement structure based on high-performance ecological macroporous concrete material - Google Patents
Composite pavement structure based on high-performance ecological macroporous concrete material Download PDFInfo
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- CN114525707B CN114525707B CN202111664390.9A CN202111664390A CN114525707B CN 114525707 B CN114525707 B CN 114525707B CN 202111664390 A CN202111664390 A CN 202111664390A CN 114525707 B CN114525707 B CN 114525707B
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- 239000004567 concrete Substances 0.000 title claims abstract description 62
- 239000000463 material Substances 0.000 title claims abstract description 46
- 239000002131 composite material Substances 0.000 title claims abstract description 27
- 239000004568 cement Substances 0.000 claims abstract description 58
- 239000010426 asphalt Substances 0.000 claims abstract description 41
- 239000011384 asphalt concrete Substances 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000002156 mixing Methods 0.000 claims description 32
- 239000012744 reinforcing agent Substances 0.000 claims description 17
- 239000000843 powder Substances 0.000 claims description 11
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 10
- 239000011707 mineral Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 9
- 235000019738 Limestone Nutrition 0.000 claims description 6
- 239000004746 geotextile Substances 0.000 claims description 6
- 239000006028 limestone Substances 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000005336 cracking Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 230000035699 permeability Effects 0.000 abstract description 9
- 230000009467 reduction Effects 0.000 abstract description 7
- 238000003860 storage Methods 0.000 abstract description 5
- 239000010410 layer Substances 0.000 description 37
- 238000010276 construction Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 241000196324 Embryophyta Species 0.000 description 6
- 238000005056 compaction Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 229920001187 thermosetting polymer Polymers 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000011800 void material Substances 0.000 description 4
- 239000003623 enhancer Substances 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
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- 238000005498 polishing Methods 0.000 description 2
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- 238000005464 sample preparation method Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000537371 Fraxinus caroliniana Species 0.000 description 1
- 235000010891 Ptelea trifoliata Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
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- 239000012790 adhesive layer Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- 229910052799 carbon Inorganic materials 0.000 description 1
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- 238000012423 maintenance Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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Classifications
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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
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention relates to a composite pavement structure based on a high-performance ecological macroporous concrete material, which is characterized by comprising a macroporous asphalt concrete layer and a macroporous cement concrete layer which are stacked up and down, wherein the thickness ratio of the macroporous asphalt concrete layer to the macroporous cement concrete layer is (3-8) (10-25). Compared with the prior art, the invention has the advantages that the upper layer is made of large-gap asphalt concrete, the lower layer is made of large-gap cement concrete, and the high-adhesion emulsified asphalt is used as an intermediate bonding layer to form the composite pavement structure. The upper layer adopts a high-performance ecological large-gap asphalt pavement, the functional characteristics of skid resistance, noise reduction, driving safety, comfort and the like are brought into play, the lower layer adopts a high-performance ecological large-gap cement concrete pavement, the advantages of high permeability and water storage capacity, high mechanical strength, good durability and long structural life are brought into play, and therefore the ecological function, mechanical property and durability of the large-gap composite pavement are greatly improved, and the comprehensive cost is reduced.
Description
Technical Field
The invention belongs to the technical field of traffic engineering material preparation and pavement structures, and relates to a composite pavement structure based on a high-performance ecological macroporous concrete material.
Background
Along with the popularization of sponge cities, the demand and application requirements for high-performance ecological large-gap concrete materials are higher and higher. The ecological large-gap pavement is used as an effective sponge facility, has obvious water penetrating and storing functions, and is widely used for inorganic motor car load roads such as sidewalks, walking streets, garden roads and the like, and areas such as roads, squares, parking lots and the like with light load requirements. Because the large-gap structure of the ecological large-gap pavement is obviously easy to damage due to the stress concentration phenomenon under the load effect, the ecological large-gap pavement is less applied to medium-heavy load roads. The large-gap pavement partially applied to the medium-heavy-load area often leads to remarkable reduction of various gap characteristics of the pavement, such as reduction of water permeability, because of too much importance on improvement of mechanical bearing capacity and durability, and once heavy rain weather occurs, accumulated water is easy to occur, so that pedestrians and traffic are affected.
In addition, the ecological large-gap pavement in the current stage is simple in construction process, the surface layer is often blocked by excessive asphalt and cement in the compaction process, various functional performances based on gap characteristics are obviously reduced, and the problems influence the application of the technology to a certain extent.
Disclosure of Invention
The invention aims to provide a composite pavement structure based on a high-performance ecological macroporous concrete material, which is used for solving the problems of poor ecological/void function, low mechanical strength and short service life of the existing large-void concrete pavement.
The aim of the invention can be achieved by the following technical scheme:
a composite pavement structure based on high-performance ecological macroporous concrete materials comprises a macroporous asphalt concrete layer and a macroporous cement concrete layer which are stacked up and down, wherein the thickness ratio of the macroporous asphalt concrete layer to the macroporous cement concrete layer is (3-8) (10-25).
As the preferable technical scheme, the composite pavement structure is suitable for adopting an automatic paving mode to ensure the construction quality, so that materials used for the macroporous asphalt concrete layer and the macroporous cement concrete layer have the characteristics of good construction workability, compaction without slurry, suitability for quick and large-area paving and the like.
Further, the thickness of the macroporous asphalt concrete layer is 3-8cm, the porosity is 10-12%, the macroporous asphalt concrete material is prepared by adopting a mixing tower dry mixing method (additionally adding an enhancer) batch by batch and mass mixing production mode, and the method comprises the steps of conveying the asphalt enhancer (with high Wen Gaonian, medium and low temperature thermosetting, high strength and other modification effects) and fine aggregates together into a mixing tower according to the proportion, and uniformly stirring to form the weak thermosetting macroporous asphalt concrete material with good fluidity.
The preparation method comprises the following steps:
m1: adding the first part of SBS modified asphalt, an asphalt reinforcing agent, mineral powder and fine aggregate into a mixing plant, and mixing for at least 30s; the method comprises the steps of carrying out a first treatment on the surface of the
M2: adding the coarse aggregate and the second part of SBS modified asphalt into a mixing plant together for mixing, wherein the mixing time is preferably more than 60s, so as to obtain a macroporous asphalt concrete material;
wherein the mass ratio of the coarse aggregate to the fine aggregate to the mineral powder to the SBS modified asphalt to the asphalt reinforcing agent is (1900-2000): (180-200), (130-140) and (10-20), wherein the mass ratio of the first part of SBS modified asphalt to the second part of SBS modified asphalt is (2.4-3.8) 1.
Further, the coarse aggregate is basalt aggregate, and the grain size distribution is 5-10mm.
Further, the fine aggregate is limestone machine-made sand with the particle size of 0-4.75mm, wherein the particle size is 0-2.36mm (the mass ratio is 0-25%).
Further, the passing rate of the mineral powder with the diameter of more than 0.075mm is 95-100%.
Further, the asphalt reinforcing agent is a particulate plasticizing and tackifying asphalt reinforcing agent, contains a small amount of thermosetting rubber particles, and has an average particle diameter of preferably 1 to 3mm.
Further, in the batch mixing production mode, the mixing amount of each batch should be 10-20m 3 。
As a preferable technical scheme, the weak thermosetting macroporous asphalt concrete material needs to ensure the temperature (more than or equal to 175 ℃) of the mixture according to the conveying distance of the mixture and weather reasons, and ensures that the mixture has good construction workability and compaction characteristics before paving.
Further, the thickness of the macroporous cement concrete layer is 10-25cm, the porosity is 15-20%, and the strength reaches more than C25 (the compressive strength is more than or equal to 25MPa, and the flexural strength is more than or equal to 3.0). The preparation method of the macroporous cement concrete material comprises the following steps:
n1: adding a first part of water into a mixing building;
n2: mixing cement with a cement reinforcing agent, adding the mixture, aggregate and a second part of water into a mixing plant respectively, and mixing for preferably more than 120 seconds to obtain a macroporous cement concrete material;
wherein the mass ratio of the aggregate, the cement, the water and the cement reinforcing agent is 1680:460:155:18, the mass ratio of the first part of water to the second part of water is (0.8-1.8): 4, the ash collection ratio is 0.20-0.25, and the water-ash ratio is 0.32-0.36.
Further, the particle size distribution of the aggregate is 5-10mm.
Further, the cement reinforcing agent is powder, has the functions of tackifying and plasticizing while improving the strength of the concrete, and is convenient for the procedures of automatic paving, compacting and the like of the large-gap cement concrete, and the dosage is 3-5% of the weight of the cement.
Further, in the ash collection ratio, cement is Portland cement, and is preferably Portland cement P.O 42.5.5; the aggregate is basalt, and can be replaced by limestone with higher quality.
Further, crack-resistant geotextile is attached to the surfaces of the shrinkage joint and the expansion joint of the macroporous cement concrete layer, and the shear strength of the crack-resistant geotextile is not less than 0.6MPa.
Further, a water-permeable bonding layer is arranged between the macroporous asphalt concrete layer and the macroporous cement concrete layer, and the water-permeable bonding layer is prepared by uniformly stirring high-bonding emulsified asphalt, a silane coupling agent and penetrating oil for 5-10 minutes at 100-300 rpm according to the mass ratio of 100:4:10. Wherein the high-adhesion emulsified asphalt is prepared by Ningbo Daqian municipal engineering Co Ltd (DQ 004 modified), and the demulsification time of the high-adhesion emulsified asphalt is less than 20min, and the water permeability coefficient is not less than 5mm/s.
Further, the overflow pipe is buried in the macroporous cement concrete layer, a plurality of liquid inlets are formed in the overflow pipe, the surface runoff of the road surface in the rainy period can be greatly reduced, the driving safety is improved, and the pipe diameter of the overflow pipe is not more than 5cm according to the design requirement.
Based on the concepts of carbon reduction, energy saving and sustainable development, the ecological function, mechanical strength and durability of the ecological large-gap cement concrete material are guaranteed, meanwhile, the upper layer is made of large-gap asphalt concrete, the lower layer is made of large-gap cement concrete, and the high-cohesive-force emulsified asphalt is used as an intermediate bonding layer to form the composite pavement structure. The upper layer adopts a high-performance ecological large-gap asphalt pavement, the functional characteristics of skid resistance, noise reduction, driving safety, comfort and the like are brought into play, the lower layer adopts a high-performance ecological large-gap cement concrete pavement, the advantages of high permeability and water storage capacity, high mechanical strength, good durability and long structural life are brought into play, and therefore the ecological function, mechanical property and durability of the large-gap composite pavement are greatly improved, and the comprehensive cost is reduced.
The pavement structure in the invention can obtain a composite pavement structure;
compared with the prior art, the invention has the following characteristics:
1) The large-gap asphalt concrete used in the invention has the characteristics of high Wen Gaonian, medium and low temperature thermosetting, high strength and the like, can enhance the functional characteristics of water permeation and storage, skid resistance, noise reduction, temperature reduction, driving safety, comfort and the like of the upper layer, and experiments show that the anti-scattering performance of the asphalt concrete reaches 5-7% (the specification is less than or equal to 15%), the rutting stability is 8000-12000 (the specification is less than or equal to 5000), and the water permeability coefficient is more than or equal to 5mm/s; the large-gap cement concrete has the characteristics of high viscosity, high plasticity, easy mechanical construction and the like, plays the advantages of strong permeability, strong water storage capacity, high mechanical strength, good durability and long structural life, further enhances the overall function, road performance and service life of the composite pavement, and experiments show that the compressive strength can reach 25-35MPa, the flexural strength can reach 3.0-4.0MPa, and the water permeability coefficient is more than or equal to 10mm/s;
2) The form of the composite pavement of the lower layer of the permeable asphalt pavement is replaced by the permeable cement layer (strong in permeable and water storage capacity, high in mechanical strength, good in durability and long in structural life), so that the ecological pavement mechanics, road performance and service life of the large-gap ecological pavement are obviously improved while the functional characteristics of the ecological large-gap pavement are ensured. Meanwhile, the automatic paving mode is used for quick construction, the problems that the construction period is wasted and the paving quality cannot be guaranteed due to manual paving of large-gap cement concrete are solved, manpower and material resources are greatly saved, the comprehensive cost is reduced, and the application market of large-gap ecological pavement in the traffic field, particularly in the medium-heavy-load field is widened;
3) In the preparation process of the large-void asphalt concrete material and the large-void cement concrete material, the asphalt reinforcing agent or the cement reinforcing agent is conveyed together with the fine aggregate, so that the reinforcing agent with strong viscosity at high temperature during mixing can be uniformly distributed on the surface of the fine aggregate, and the reinforcing effect is ensured;
4) When preparing large-gap asphalt concrete, the meta-acid asphalt is added in two batches: the SBS modified asphalt with high mass ratio is mixed with the alkaline limestone fine aggregate, mineral powder and the like, and the chemical acid-base adsorption reaction is utilized to facilitate the formation of high-performance asphalt mortar; the second batch of SBS modified asphalt (softer) with a smaller mass ratio is directly wrapped with coarse aggregate to form a flexible protective film, and then the flexible protective film is mixed with high-performance asphalt mortar (harder: mineral powder and fine aggregate are mixed), so that the occurrence of stress concentration phenomenon when the tips of the coarse aggregate are in direct contact with the asphalt mortar due to the existence of macropores in the mixture is reduced, the interface bonding strength is improved, and the mechanical property and durability of asphalt concrete are improved.
Drawings
FIG. 1 is a schematic structural view of a composite pavement structure based on a high-performance ecological macroporous concrete material in an embodiment;
FIG. 2 is a physical diagram of a composite pavement structure based on a high-performance ecological macroporous concrete material in an embodiment;
the figure indicates:
1-macropore asphalt concrete layer, 2-macropore cement concrete layer, 3-water permeable bonding layer, 4-overflow pipe, 5-water proof bonding layer, 6-cement stabilized macadam base layer and 7-compacted soil base.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
Example 1:
the preparation method of the macroporous asphalt concrete material comprises the following steps:
the raw materials comprise: 1980kg of basalt coarse aggregate with the grain size distribution of 5-10mm, 195kg of limestone fine aggregate (machine-made sand) with the grain size of 0-4.75mm, 130kg of mineral powder, 133kg of SBS modified asphalt and 24kg of asphalt reinforcing agent (G-10000 high-viscosity modifying agent provided by Tian-Ji-Cheng Co., ltd., beijing);
m1: injecting 99.8kg SBS modified asphalt into the mixing plant, uniformly feeding asphalt reinforcing agent, mineral powder and limestone fine aggregate in a crawler type manner, and mixing at high speed for 30s;
m2: adding the rest 33.2kg of SBS modified asphalt and basalt coarse aggregate into a mixing plant, and mixing at high speed (90 rpm) for 60s to obtain a macroporous asphalt concrete material;
m4: based on the steps, 5 batches of macroporous asphalt concrete materials are prepared by adopting the same proportion, and the mixing amount of each batch is controlled to be 10-20 cubic meters;
by combining the sample preparation and test method of standard Marshall test pieces and rutting boards in Highway asphalt pavement construction technical Specification (JTG F40-2019), the average loss of the mixture of the Kentaburg scattering experiment of the concrete material is 6.3 percent (which is far smaller than the specification requirement; 15 percent), and the rutting stability is 11800 (which is far greater than the specification requirement; 5000 times/mm).
The preparation method of the macroporous cement concrete material comprises the following steps:
the raw materials comprise: 5-10mm basalt aggregate 1680kg, P.O 42.5 cement 460kg, water 155kg, cement enhancer 18kg;
n1: injecting 31kg of water into the mixing plant to moisten and mix the system;
n2: mixing cement and cement reinforcing agent in advance, and adding the mixture and aggregate into a mixing building;
and N3: adding the rest 124kg of water, and stirring at high speed for 100s to obtain a macroporous cement concrete material;
n4: based on the above steps, 40 batches of macroporous cement concrete materials are prepared by adopting the same proportion, and the mixing amount of each batch is controlled to be 5-10 cubic meters.
By combining the sample preparation and test methods of standard compression resistance and fracture resistance test pieces in the test method Standard of physical and mechanical properties of concrete (GB/T50081-2019), the compressive strength of the concrete material in the 28-day age period under normal temperature maintenance is up to 33MPa, and the fracture strength is up to 4.0MPa. Wherein the curing adopts civil woven cloth covered with water for curing for 7 days, at least 3 times a day; when the temperature is higher than 30 ℃, the watering frequency is increased, and the geotechnical cloth is ensured to be in a wet state.
The preparation method of the composite pavement structure based on the high-performance ecological macroporous concrete material shown in fig. 1 comprises the following steps:
s1: compacting the soil base 7: static pressure of the 16 vibratory roller is stabilized, vibration compaction is carried out for 6 times, and the compaction degree is not less than 96%;
s2: cement stabilized macadam foundation 6: adopting an MT9500A paver for automatic paving, wherein the paving speed is slow (1.5 m/min), the loosening coefficient is 1.25, and the tamping force is required to be determined through a pre-experiment; then adopting a double-steel-wheel vibratory roller to perform static pressure for 2 times at a slow speed (1.0 km/h), performing vibration compaction by a single-wheel vibratory roller (2.5 km/h) machine, and finally performing rubber-covered rolling (3.0 km/h) for 2 times;
s3: waterproof adhesive layer 5: the construction is performed by adopting manual brushing or mechanical spraying, the coating is uniform, and meanwhile, the air is prevented from being immersed;
s4: macropore cement concrete layer 2: the transport vehicle and the paving vehicle synchronously run and discharge while paving. The pressure parameter in the self-carrying tamping system of the paver is set to be 30 percent (one-time paving forming, 20 cm) and the paving speed is about 1.5m/min; before paving, arranging a longitudinal overflow pipe on the surface of the waterproof bonding layer every 20m according to the drainage design requirement, wrapping crushed stone with a trapezoid longitudinal section around the waterproof bonding layer, and vibrating, leveling and compacting; at the paving starting and stopping stages, the artificial feeding is vibrated flat by a vibrating plate to compensate for the initial error; during the paving process, the hole is manually fed; adopting an artificial polishing mode, paving and polishing simultaneously to prepare the cement concrete layer 2 with the large aperture of 8 cm;
s5: the crack-resistant geotextile with the span of 0.5m is attached to the surfaces of the shrinkage joint and the expansion joint of the macroporous cement concrete layer 2, and the type is self-adhesive polyester glass fiber cloth produced by Shandong Weifeng feijie environmental protection technology Co., ltd, and the shear strength is more than or equal to 0.6MPa;
s6: uniformly coating the water-permeable bonding layer material on the surfaces of the macroporous cement concrete layer 2 and the anti-cracking geotextile by using a spraying machine to form the water-permeable bonding layer 3, wherein the demulsification time is less than 20min, the paving of the large-gap asphalt concrete cannot be carried out before demulsification, and the water permeability coefficient is not less than 5mm/s; wherein the high-adhesion emulsified asphalt is prepared by Ningbo Daqian municipal engineering Co., ltd (DQ 004 modification);
s7: macropore asphalt concrete layer 1: the transport vehicle and the paving vehicle run synchronously, and are paved and discharged simultaneously; 1-2 transport vehicles wait, the paver is used for uninterrupted construction, and the paving speed is about 2.5m/min;
thus, a macroporous asphalt concrete layer 1 having a thickness of 2cm and a composite pavement structure (as shown in FIG. 2) were obtained.
The average pore of the pavement reaches 18.6%, the water permeability coefficient reaches 6mm/s (specification is more than or equal to 0.5 mm/s), the slip resistance BPN is more than or equal to 65 (specification is more than or equal to 42), the anti-scattering performance reaches 6.3% (specification is less than or equal to 15%), the rutting stability is 11800 (specification is more than or equal to 5000 times/mm), and the durability is improved by 30%.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.
Claims (9)
1. A composite pavement structure based on high-performance ecological macroporous concrete materials is characterized by comprising a macroporous asphalt concrete layer (1) and a macroporous cement concrete layer (2) which are stacked up and down, wherein the thickness ratio of the macroporous asphalt concrete layer (1) to the macroporous cement concrete layer (2) is (3-8): 10-25;
the macroporous asphalt concrete layer (1) is made of a macroporous asphalt concrete material, and the preparation method of the macroporous asphalt concrete material comprises the following steps:
m1: adding the first part of SBS modified asphalt, asphalt reinforcing agent, mineral powder and fine aggregate into a mixing building, and mixing for at least 30s;
m2: adding the coarse aggregate and the second part of SBS modified asphalt into a mixing building together, and mixing for at least 60s to obtain a high-performance macroporous asphalt concrete material;
wherein the mass ratio of the coarse aggregate to the fine aggregate to the mineral powder to the SBS modified asphalt to the asphalt reinforcing agent is (1900-2000): (180-200), (130-140) and (10-20), wherein the mass ratio of the first part of SBS modified asphalt to the second part of SBS modified asphalt is (2.4-3.8) 1.
2. The composite pavement structure based on the high-performance ecological macroporous concrete material according to claim 1, wherein the coarse aggregate is basalt aggregate, and the grain size distribution is 5-10mm.
3. The composite pavement structure based on the high-performance ecological macroporous concrete material according to claim 1, wherein the fine aggregate is limestone machine-made sand with the grain size of 0-4.75 mm.
4. The composite pavement structure based on high-performance ecological macroporous concrete material according to claim 1, wherein the passing rate of the mineral powder with the diameter of more than 0.075mm is 95-100%.
5. The composite pavement structure based on high-performance ecological macroporous concrete material according to claim 1, wherein the macroporous cement concrete layer (2) is made of macroporous cement concrete material, and the preparation method of the macroporous cement concrete material comprises the following steps:
n1: adding a first part of water into a mixing building;
n2: mixing cement with a cement reinforcing agent, adding the mixture with aggregate and a second part of water into a mixing building respectively, and mixing to obtain a macroporous cement concrete material;
wherein the mass ratio of the aggregate, the cement, the water and the cement reinforcing agent is 1680:460:155:18, and the mass ratio of the first part of water to the second part of water is (0.8-1.8): 4.
6. The composite pavement structure based on high-performance ecological macroporous concrete material according to claim 1, wherein the thickness of the macroporous asphalt concrete layer (1) is 3-8cm, and the thickness of the macroporous cement concrete layer (2) is 10-15 cm.
7. The composite pavement structure based on the high-performance ecological macroporous concrete material according to claim 1, wherein the shrinkage joint and expansion joint surfaces of the macroporous cement concrete layer (2) are adhered with anti-cracking geotextiles, and the shear strength of the anti-cracking geotextile is not less than 0.6MPa.
8. The composite pavement structure based on the high-performance ecological macroporous concrete material, which is disclosed in claim 1, is characterized in that a water-permeable bonding layer (3) is further arranged between the macroporous asphalt concrete layer (1) and the macroporous cement concrete layer (2), and the water-permeable bonding layer (3) is prepared by uniformly stirring 100-300 revolutions per minute for 5-10 minutes by high-adhesion emulsified asphalt, silane coupling agent and penetrating layer oil according to the mass ratio of 100:4:10.
9. The composite pavement structure based on the high-performance ecological macroporous concrete material, as set forth in claim 1, is characterized in that the macroporous cement concrete layer (2) is embedded with an overflow pipe (4), and the upper half surface of the overflow pipe (4) is provided with a plurality of liquid inlets.
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