CN115450086B - Old cement concrete pavement reconstruction structure suitable for non-extra-heavy traffic grade and design method - Google Patents
Old cement concrete pavement reconstruction structure suitable for non-extra-heavy traffic grade and design method Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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- E01C7/00—Coherent pavings made in situ
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Abstract
The invention relates to the technical field of old cement concrete pavement reconstruction, and particularly discloses a design method of an old cement concrete pavement reconstruction structure suitable for non-extra-heavy traffic grades, which comprises the following steps: determining a crushing process according to traffic load, technical conditions of old cement pavements and environmental conditions; asphalt is adopted to cool and regenerate the crushed stone surface layer material on the ground to form a cool and regenerated upper base layer of the crushed stone material of the old cement pavement, and the mechanical performance parameters are measured; taking a broken lower base layer fracture but not broken part as a lower base layer material, and measuring the rebound modulus and poisson ratio parameters of the lower base layer fracture; designing an asphalt macadam sealing layer, an asphalt mixture lower layer and an asphalt mixture upper layer on a macadam material upper base layer; checking road surface structural parameters; obtaining the old cement concrete pavement reconstruction structure. The invention combines the design of the old cement concrete pavement reconstruction structure and the material design, improves the design quality of the pavement reconstruction structure, greatly improves the integrity of the pavement structure, and improves the pavement reconstruction efficiency and the durability after pavement reconstruction.
Description
Technical Field
The invention belongs to the technical field of old cement concrete pavement reconstruction, and particularly relates to an old cement concrete pavement reconstruction structure and a design method suitable for non-extra-heavy traffic grades.
Background
By 2012, the total mileage of the cement concrete pavement in China reaches 165.3 ten thousand kilometers, and the cement concrete pavement in China becomes one of the most countries in the world. However, with the increase of traffic, under the combined action of the load of the driving and the natural environment, the cement concrete pavement inevitably has diseases such as fracture, subsidence, staggering, mud pumping and the like, and the increase of heavy load and overload vehicles further aggravates the generation and development of the diseases. Therefore, effective measures must be taken to enhance maintenance and repair of cement concrete pavement.
At present, the technology for modifying the old cement concrete pavement mainly comprises the following two modes: cement concrete pavement and cement concrete pavement (Bai Jiabai); (II) additionally paving an asphalt concrete pavement on the cement concrete pavement. There are two different structural forms of this approach: (1) After the maintenance treatment of the cement concrete pavement, an intermediate transition layer is additionally paved, and then an asphalt surface layer (white and black) is additionally paved; (2) Crushing and compacting the cement concrete pavement (or additionally paving a base layer), and additionally paving an asphalt surface layer (white to black), namely crushing and modifying.
The pavement asphalt concrete surface layer is additionally paved after the old cement concrete pavement is crushed and petrochemical, so that the stress characteristic of the pavement can be improved, and the service performance of the pavement is improved; however, the surface layer of the crushed and petrochemical old cement panel is in a range of 10cm and is granular, contains more powdery fine particles and has poor bearing capacity. The conventional emulsified asphalt cannot permeate stably, so that the connection among particles is very weak, the bearing effect cannot be achieved, and diseases such as cracks and the like appear on the subsequent asphalt pavement.
Disclosure of Invention
The invention aims to provide an old cement concrete pavement reconstruction structure suitable for non-extra-heavy traffic grades and a design method thereof, and overcomes the defects of weak bearing effect, short service life and the like of the existing old cement concrete pavement after reconstruction.
In order to achieve the above object, the present invention provides a design method of an old cement concrete pavement reconstruction structure suitable for non-extra heavy traffic class, comprising the steps of:
(1) Determining a crushing process of the old cement concrete panel according to traffic load, the technical condition of the old cement pavement and the environmental condition of the old pavement;
(2) Taking a broken lower base layer fracture-uncrushed part as a lower base layer material, and measuring the rebound modulus and poisson ratio parameters of the lower base layer;
(3) Adding coarse aggregate, stone scraps, cementing materials prepared from industrial solid wastes and fibers into crushed petrochemical layer materials of a crushed surface layer, spreading the crushed pavement with the fibers, performing an in-situ cold regeneration process by using foamed asphalt or emulsified asphalt to form a cold regenerated old cement pavement crushed petrochemical material upper base layer, and measuring the dynamic rebound modulus, poisson ratio and dynamic stability of the pavement;
(4) Paving an asphalt macadam sealing layer on a base layer of a cold-in-place recycled old cement pavement crushed stone layer material, then opening traffic, and increasing compactness of the asphalt macadam sealing layer through vehicle rolling;
(5) Designing a lower surface layer and an upper surface layer of asphalt mixture on the asphalt macadam seal layer to initially obtain a pavement structure;
(6) Adopting an elastic layered system theory to check road surface structural parameters;
(7) The old cement concrete pavement reconstruction structural scheme suitable for the non-extra-heavy traffic grade is obtained.
Preferably, in the above design method for the old cement concrete pavement reconstruction structure suitable for the non-extra heavy traffic grade, in the step (6), the fatigue cracking life of the asphalt mixture layer, the permanent deformation of the asphalt mixture layer and the vertical compressive strain of the top surface of the roadbed are checked by adopting an elastic layered system theory, and the vertical shearing stress of the base layer on the crushed petrochemical material of the old cement pavement is checked by adopting a molar coulomb theory.
The old cement concrete pavement reconstruction structure suitable for the non-extra-heavy traffic grade is designed by adopting the design method of the old cement concrete pavement reconstruction structure suitable for the non-extra-heavy traffic grade, and sequentially comprises an anti-slip wear-resistant asphalt concrete upper layer, a function-adjustable asphalt concrete lower layer, an asphalt macadam sealing layer, a cold recycled old cement pavement rubble material upper base layer and an old cement concrete pavement rubble lower base layer from top to bottom.
Preferably, in the old cement concrete pavement reconstruction structure suitable for the non-extra-heavy traffic grade, the thickness of the upper surface layer of the anti-skid wear-resistant asphalt concrete is 3-6 cm, and the dynamic modulus is more than 7000MPa.
Preferably, in the old cement concrete pavement reconstruction structure suitable for the non-extra heavy traffic grade, the anti-slip wear-resistant asphalt concrete upper layer adopts AC asphalt concrete, SMA concrete or Superpave asphalt concrete of diabase or basalt.
Preferably, in the old cement concrete pavement reconstruction structure suitable for the non-extra-heavy traffic grade, the thickness of the lower surface layer of the function-adjustable asphalt concrete is 5-7 cm, the dynamic stability is more than or equal to 2400 times/mm, and the dynamic modulus is more than or equal to 8000MPa.
Preferably, in the above-mentioned old cement concrete pavement reconstruction structure suitable for non-extra heavy traffic grade, the function-adjustable asphalt concrete lower surface layer is an AC-20, AC-25 or ATB-25 asphalt mixture, and the asphalt used is matrix asphalt, modified asphalt or high-modulus asphalt.
Preferably, in the old cement concrete pavement reconstruction structure suitable for the non-extra-heavy traffic grade, the thickness of the asphalt macadam seal layer is 2-3 cm, and the rebound modulus is 4000-5000 MPa.
Preferably, in the above-mentioned old cement concrete pavement reconstruction structure suitable for non-extra heavy traffic grade, the asphalt-macadam seal layer is a double-layer asphalt-macadam layer paved by a layer paving method, and comprises, from bottom to top, a first layer of matrix asphalt, coarse aggregate with the particle size of 10-15 mm, a first layer of matrix asphalt and fine aggregate with the particle size of 5-10 mm, wherein the sprinkling amount of the first layer of matrix asphalt is 0.9-1.1 kg/m 2 Coarse aggregate with particle size of 10-15 mm has sprinkling amount of 10-14 m 3 /1000m 2 The asphalt spraying amount of the second layer of matrix is 0.6-0.8 kg/m 2 Coarse aggregate with particle size of 5-10 mm is sprayed in an amount of 7-9 m 3 /1000m 2 。
Preferably, in the above-mentioned old cement concrete pavement reconstruction structure suitable for non-extra heavy traffic grade, the upper base layer of the cold recycled old cement pavement rubblizing material is an asphalt mixture obtained by performing on-site cold recycling on a rubblizing layer material with the thickness of 8-10 cm on the surface layer of the old cement pavement rubblizing material by adopting emulsified asphalt or foamed asphalt, the thickness is 8-12 cm, and the rebound modulus is 3000-5000 MPa; the rubblized lower base layer of the old cement concrete pavement is formed by a lower material of the old cement pavement after rubblization, the thickness is 10-15 cm, and the rebound modulus is 1000-1400 MPa. After the old cement pavement is crushed and petrochemical, two layers of different materials can be formed, the crushed and mineralized layer materials on the surface layer are uneven in particle size crushing and low in bearing capacity, the crushed and petrochemical layer is solidified by adopting an in-situ cooling and regenerating process, the granular materials are solidified into asphalt concrete, and the bearing capacity of the pavement is remarkably improved.
Preferably, in the above-mentioned old cement concrete pavement reconstruction structure suitable for non-extra heavy traffic grade, coarse aggregate, cementing material, stone dust and fiber are further added into the in-situ cold-recycled asphalt mixture, the crushed petrochemical layer material, coarse aggregate, cementing material, stone dust and fiber form aggregate in the in-situ cold-recycled asphalt mixture, and the weight ratio of the crushed petrochemical layer material, coarse aggregate, cementing material, stone dust and fiber is 70-80:8-15:3-5:5-8:1-2; the use amount of the emulsified asphalt is 2.5% -3.3% of the aggregate, and the use amount of the foamed asphalt is 2% -3% of the mixed aggregate; the coarse aggregate is one or more of limestone, granite and sandstone with the particle size of 10-15 mm, the cementing material is prepared by mixing industrial solid waste fly ash, slag, steel slag, quartz powder and tailings according to the weight ratio of 1-2:8-10:4-6:1-3:2-4, the particle size of stone chips is 0-3 mm, the fiber is one or more of basalt fiber, glass fiber and polyester fiber, and the fiber length is 3-18 mm.
Preferably, in the above-mentioned old cement concrete pavement reconstruction structure suitable for non-extra heavy traffic grade, the concrete construction process of the base layer on the cold recycled old cement pavement rubblizing material is: after the old cement pavement is crushed and petrochemical, a crushed stone material transporting vehicle and a powder tank truck are adopted to spread coarse aggregates, stone scraps and cementing materials and fibers prepared from industrial solid wastes on the pavement after the crushing, the crushed stone surface materials are stirred in situ through an in-situ cold regeneration device, foam asphalt or emulsified asphalt is added for solidification, and after the foam asphalt or emulsified asphalt is stirred uniformly, the mixture is transported to a paving device for paving and rolling, and a foam asphalt or emulsified asphalt mixture base layer is formed.
Preferably, in the above-mentioned old cement concrete pavement reconstruction structure suitable for non-extra heavy traffic grade, the emulsified asphalt is modified emulsified asphalt, and the modified emulsified asphalt comprises the following components in parts by mass: 100-150 parts of emulsified asphalt, 1-3 parts of terpene resin emulsion, 0.03-0.2 part of alkyl glycoside and 0.2-0.5 part of cocamidopropyl hydroxysulfobetaine. The emulsified asphalt is cation slow-cracking emulsified asphalt.
Compared with the prior art, the invention has the following beneficial effects:
1. the design method of the old cement concrete pavement reconstruction structure suitable for the non-extra-heavy traffic grade combines the design of the old cement concrete pavement reconstruction structure and the design of materials, can improve the design quality of the pavement reconstruction structure, greatly improves the integrity of the pavement structure, and improves the pavement reconstruction efficiency, the service performance after pavement reconstruction and the durability life.
2. The invention is suitable for the old cement concrete pavement reconstruction structure of the non-extra heavy traffic grade, the old cement pavement is divided into two layers after being crushed and petrochemical, and the crushed lower layer is taken as a lower base layer, so that the pavement reconstruction structure has the characteristics of cracking but not crushing and has stronger bearing effect; the foamed asphalt or emulsified asphalt is adopted to solidify the upper layer of granular material as a base layer, so that a weak layer is eliminated, the bearing capacity of the pavement is obviously improved, and the rut resistance of the pavement is improved; the characteristics of the asphalt macadam seal layer as a pavement structural layer are enhanced, the modulus range is clear, and the fatigue resistance of the pavement is improved; the rigid pavement is changed into the flexible pavement, so that the subsequent maintenance cost of the pavement is reduced, and the maintenance efficiency is improved.
3. The invention is suitable for the old cement concrete pavement reconstruction structure of the non-extra heavy traffic grade, fully utilizes the crushed granules of the old cement pavement, adopts emulsified asphalt and foamed asphalt for on-site cold regeneration, improves the construction efficiency, and is beneficial to rapid traffic opening; by adding coarse aggregates, stone chips, fibers and cementing materials prepared from industrial solid wastes, all aggregates are mutually embedded, the integrity and stability of the base layer on the cold-recycled old cement pavement crushed petrochemical material can be improved, and the mechanical property is improved.
4. The invention is suitable for the old cement concrete pavement reconstruction structure of non-extra-heavy traffic grade, modifies emulsified asphalt, improves the penetration and adhesion of asphalt to aggregate, and improves the distribution uniformity of asphalt in the aggregate, thereby improving the bonding strength among aggregate particles and improving the bearing effect of the pavement structure.
Drawings
Fig. 1 is a flow chart showing the design of the old cement concrete pavement improvement structure suitable for the non-extra heavy traffic class in the embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of the old cement concrete pavement reconstruction structure suitable for non-extra heavy traffic grade according to the present invention.
The main reference numerals illustrate:
1-an anti-slip wear-resistant asphalt concrete upper layer, 2-a function-adjustable asphalt concrete lower layer, 3-an asphalt macadam sealing layer, 4-a cold recycled old cement pavement rubble material upper base layer, 5-an old cement concrete pavement rubble lower base layer and 6-an original pavement base layer.
Detailed Description
The following detailed description of specific embodiments of the invention is, but it should be understood that the invention is not limited to specific embodiments.
Example 1
The design method of the old cement concrete pavement reconstruction structure suitable for the non-extra heavy traffic grade comprises the following steps:
(1) Determining a crushing process of an old cement concrete panel according to traffic load, the technical condition of an old cement pavement and the environmental condition of the old pavement, wherein structural road sections such as a bridge passing through villages and towns and the like adopt a resonance rubblizing crushing mode, and the rest road sections adopt a multi-hammer rubblizing mode;
(2) Taking a broken lower base layer fracture-uncrushed part as a lower base layer material, and measuring the rebound modulus and poisson ratio parameters of the lower base layer;
(3) Adding coarse aggregate, stone scraps, cementing materials prepared from industrial solid wastes and fibers to a crushed material layer material with the thickness of 8-10 cm on the crushed upper surface layer, spreading the cementing materials and fibers on a crushed pavement, performing an in-situ cold recycling process by using foamed asphalt or emulsified asphalt to form a cold recycled old cement pavement crushed material upper base layer, and measuring the dynamic rebound modulus, poisson ratio and dynamic stability of the crushed material layer;
(4) Paving an asphalt macadam sealing layer on a base layer of a cold-in-place recycled old cement pavement crushed stone layer material, then opening traffic, and increasing compactness of the asphalt macadam sealing layer through vehicle rolling;
(5) Designing a lower surface layer and an upper surface layer of asphalt mixture on the asphalt macadam seal layer to initially obtain a pavement structure;
(6) Adopting an elastic layered system theory to check the fatigue cracking life of the asphalt mixture, the permanent deformation of the asphalt mixture layer and the vertical compressive strain of the top surface of the roadbed; adopting a molar coulomb theory to check and calculate the vertical shear stress of the base layer on the cold regenerated old cement pavement crushed petrochemical material;
(7) The old cement concrete pavement reconstruction structural scheme suitable for the non-extra-heavy traffic grade is obtained.
The old cement concrete pavement reconstruction structure suitable for the non-extra heavy traffic grade of this embodiment, as shown in fig. 2, includes from top to bottom in proper order: the anti-slip wear-resistant asphalt concrete upper layer 1 is made of common AC-16 asphalt concrete; the function-adjustable asphalt concrete lower surface layer 2 is made of common AC-20 asphalt concrete; asphalt macadam seal layer 3, and upper base layer 4 of cold regenerated old cement pavement rubble material (asphalt mixture of on-site cold regenerated rubble layer material of the surface layer of the old cement pavement rubble by adopting emulsified asphalt or foamed asphalt); the old cement concrete pavement rubblizes the lower base layer 5. The thickness, modulus, poisson ratio and other technical parameters of each layer are shown in table 1.
Table 1 table of technical parameters of each layer of pavement structure of example 1
| Pavement structural layer material | Thickness (cm) | Modulus (MPa) | Poisson's ratio | Permanent set (mm) |
| Common AC-16 upper layer | 4 | 8000 | 0.25 | 1.5 |
| Common AC-20 lower layer | 5 | 9000 | 0.25 | 2.5 |
| Asphalt macadam seal | 3 | 5000 | 0.25 | 2.5 |
| In-situ cold-regenerated waste cement pavement rubblizing material upper base layer | 13 | 4500 | 0.25 | 2.5 |
| Old cement concrete pavement rubblization lower base layer | 10 | 1000 | 0.35 |
The pavement structure of the embodiment adopts 100KN standard axle load, and the number of times of the axle load is 8.4 multiplied by 10 6 Secondary, heavy traffic type; according to the current regulations of China (JTG D50-2017), the road asphalt pavement is heavy-load traffic; the theoretical calculation of the elastic lamellar system is adopted to obtain that the accumulated action frequency of equivalent design axle load on a design lane in the design service life is 3.5 multiplied by 10 7 Shaft times; asphalt layer bottom tensile strain is epsilon=93.5×10 -6 The method comprises the steps of carrying out a first treatment on the surface of the Vertical compressive strain epsilon=182×10 on top of roadbed -6 The method comprises the steps of carrying out a first treatment on the surface of the Asphalt mixture layer permanent set ra=14.32 mm.
Comparative example 1
This comparative example is a conventional pavement structure comprising, from top to bottom, in order: a dense graded asphalt concrete upper surface layer, a dense graded asphalt concrete lower surface layer, a graded broken stone base layer and an old cement pavement rubble layer; the thickness, modulus, poisson ratio and other technical parameters of each layer are shown in table 2.
Table 2 table of technical parameters of each layer of pavement structure of comparative example 1
| Pavement structural layer material | Thickness (cm) | Modulus (MPa) | Poisson's ratio | Permanent set (mm) |
| Ordinary AC-16 asphalt concrete | 4 | 8000 | 0.25 | 1.5 |
| Ordinary AC-20 asphalt concrete | 5 | 9000 | 0.25 | 2.5 |
| Graded broken stone base layer | 22 | 400 | 0.35 | |
| Crushed petrochemical layer of old cement pavement | 10 | 600 | 0.35 |
The pavement structure of this comparative example can withstand a maximum cumulative equivalent axial number of 3.5X10 6 Secondary, light traffic load; the accumulated action frequency of equivalent design axle load on the design lane within the design service life is 8.6x10 6 Shaft times; draining waterCyan bottom-pull strain becomes epsilon=114.4×10 -6 The method comprises the steps of carrying out a first treatment on the surface of the Vertical compressive strain epsilon=187×10 on top of roadbed -6 The method comprises the steps of carrying out a first treatment on the surface of the Asphalt mixture layer permanent set ra=5.55 mm.
The economic asphalt macadam treatment layer is added in the embodiment 1, so that the fatigue resistance of the pavement structure can be improved; the upper granular material of the crushed stone of the old cement pavement is solidified by adopting a cold regeneration process, the lower layer is a compact crushed stone lower base layer with the characteristic of cracking but not crushing. Compared to comparative example 1, example 1 was able to withstand heavy traffic and had a service life 4 times longer than comparative example 1, and the tensile strain at the bottom of the asphalt layer was significantly lower than comparative example 1.
Example 2
As shown in fig. 2, the old cement concrete pavement reconstruction structure suitable for non-extra heavy traffic grade sequentially comprises from top to bottom: the anti-skid wear-resistant asphalt concrete upper layer 1 is made of modified AC-16 asphalt concrete; the function-adjustable asphalt concrete lower surface layer 2 is made of high-modulus AC-20 asphalt concrete; asphalt macadam seal layer 3, upper base layer 4 of cold regenerated old cement pavement crushed petrochemical material; the old cement concrete pavement rubblizes the lower base layer 5. The thickness, modulus, poisson ratio and other technical parameters of each layer are shown in table 3.
Table 3 table of pavement Structure layers parameters of example 2
| Pavement structural layer material | Thickness (cm) | Modulus (MPa) | Poisson's ratio | Permanent set (mm) |
| Modified AC-16 upper layer | 4 | 8000 | 0.25 | 1.5 |
| High modulus AC-20 underlayer | 5 | 12000 | 0.25 | 2.5 |
| Asphalt macadam seal | 3 | 5000 | 0.25 | 2.5 |
| Cold recycled old cement pavement rubblization material upper base layer | 10 | 4500 | 0.25 | 2.5 |
| Crushed petrochemical lower layer of old cement pavement | 10 | 1000 | 0.35 |
The pavement structure of the embodiment adopts 100KN standard axle load, and the number of times of the axle load is 9.2 multiplied by 10 6 Secondary times; according to the current regulations of China (JTG D50-2017), the road asphalt pavement is heavy-load traffic; adopting elastic lamellar system theory meterThe calculated number of times of the accumulated action of equivalent design axle load on the design lane within the design service life is 3.8x10 7 Shaft times; asphalt layer bottom tensile strain is epsilon=104.3×10 -6 The method comprises the steps of carrying out a first treatment on the surface of the Vertical compressive strain epsilon=184×10 on top of roadbed -6 The method comprises the steps of carrying out a first treatment on the surface of the Asphalt mixture layer permanent set ra=14.23 mm. Meets the specification requirements.
Comparative example 2
This comparative example is a conventional pavement structure comprising, from top to bottom, in order: a graded asphalt concrete upper layer, a dense graded asphalt concrete lower layer, a low-dose cement stable graded broken stone base layer (cement dosage is 1.5% -2%, rebound modulus is 800-1000 MPa), and an old cement pavement rubble layer; the thickness, modulus, poisson ratio and other technical parameters of each layer are shown in table 4.
Table 4 table of technical parameters of each layer of pavement structure of comparative example 2
| Pavement structural layer material | Thickness (cm) | Modulus (MPa) | Poisson's ratio | Permanent set (mm) |
| Modified AC-16 asphalt concrete | 4 | 8000 | 0.25 | 1.5 |
| Ordinary AC-20 asphalt concrete | 5 | 9000 | 0.25 | 2.5 |
| Low-dosage cement stabilized graded broken stone base layer | 30 | 800 | 0.35 | |
| Crushed petrochemical layer of old cement pavement | 10 | 600 | 0.35 |
The comparative example uses a modified AC-16 asphalt concrete upper layer, a low-dose cement stabilized graded macadam base. The pavement structure of this comparative example can withstand a maximum cumulative equivalent axial number of 3.84×10 6 Secondary, light traffic load; the accumulated action frequency of equivalent design axle load on the design lane within the design service life is 9.49 multiplied by 10 6 Shaft times; asphalt layer bottom tensile strain is epsilon=112.6x10 -6 The method comprises the steps of carrying out a first treatment on the surface of the Vertical compressive strain epsilon=149×10 on top of roadbed -6 The method comprises the steps of carrying out a first treatment on the surface of the Asphalt mixture layer permanent set ra=5.71 mm.
The asphalt macadam sealing layer is added in the embodiment 2, so that the fatigue resistance of the pavement structure can be improved; adopting a modified AC-16 asphalt concrete upper layer; the method is characterized in that emulsified asphalt or foamed asphalt is used for solidifying a broken stone layer granular material of an old cement pavement to serve as an upper base layer, and a broken stone lower layer with the characteristic of cracking and not breaking is used as a lower base layer. Compared to comparative example 2, example 1 was able to withstand heavy traffic and had a service life 4 times longer than comparative example 1, and the tensile strain at the bottom of the asphalt layer was significantly lower than comparative example 1. Example 2 was able to withstand heavy traffic and had a service life 3.6 times that of comparative example 1, and the asphalt layer bottom tension strain was lower than that of comparative example 2.
The vertical shear stress of example 2 and comparative example 2 is shown in table 5, and it is clear from the table that the vertical shear stress of example 2 is lower than that of comparative example 2, and the shear stress performance is good.
Table 5 vertical shear stress of pavement structures of example 2 and comparative example 2
Example 3
The embodiment provides a cold-recycled old cement pavement rubblizing material upper base material, which is specifically an asphalt mixture prepared by carrying out cold recycling on a rubblizing layer material (particle size of 0.075-31.5 mm), coarse aggregate, cementing material, stone chips and fiber mixed aggregate, wherein the thickness of a surface layer of the old cement pavement rubblizing material is 8cm, the weight ratio of the rubblizing layer material to the coarse aggregate to the cementing material to the stone chips to the fiber is 75:12:4:6:1.5, the use amount of emulsified asphalt is 3% of the aggregate, and the emulsified asphalt is BC-1 emulsified asphalt; the coarse aggregate is limestone with the particle size of 10-15 mm, the cementing material is prepared by mixing industrial solid waste fly ash, slag, steel slag, quartz powder and tailings according to the weight ratio of 1.5:9:5:2:3, the particle size of stone chips is 0-3 mm, the fibers are basalt fibers, and the fiber length is 3-18 mm. The modified emulsified asphalt comprises the following components in parts by mass: 100 parts of BC-1 emulsified asphalt, 1.5 parts of terpene resin emulsion, 0.08 part of alkyl glycoside and 0.3 part of cocamidopropyl hydroxysulfobetaine.
Comparative example 3
This comparative example is identical to example 3, except that: the emulsified asphalt of this comparative example was BC-1 emulsified asphalt.
Comparative example 4
This comparative example is identical to example 3, except that: the modified emulsified asphalt of the comparative example comprises the following components in parts by mass: 100 parts of BC-1 emulsified asphalt and 1.5 parts of terpene resin emulsion.
Comparative example 5
This comparative example is identical to example 3, except that: the modified emulsified asphalt of the comparative example comprises the following components in parts by mass: 100 parts of BC-1 emulsified asphalt, 1.5 parts of terpene resin emulsion and 0.38 part of cocamidopropyl hydroxysulfobetaine.
Comparative example 6
This comparative example is identical to example 3, except that: the modified emulsified asphalt of the comparative example comprises the following components in parts by mass: 100 parts of BC-1 emulsified asphalt, 1.5 parts of terpene resin emulsion and 0.38 part of alkyl glycoside.
Comparative example 7
This comparative example is identical to example 3, except that: this comparative example does not contain gelling material and fibers.
The cold-recycled asphalt mixture of example 3 and comparative examples 3 to 7 was prepared by using a special mixing apparatus for cold recycling. In a laboratory, cold recycled asphalt concrete prepared in example 3 and comparative examples 3 to 7 is used for preparing Marshall test pieces according to the Highway asphalt pavement recycling technical Specification (JTG/T5521-2019), specifically: after the Marshall is adopted to be compacted for 50 times on each indoor double face, the Marshall is put into a ventilation oven to regulate and control the temperature to 60 ℃ for 48 hours, the Marshall is taken out to be compacted for 25 times on each indoor double face, the Marshall is placed for 14 hours at room temperature after the compaction is completed, and the Marshall is demoulded; the prepared Marshall test pieces were subjected to performance characterization according to Highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011), and the results are shown in Table 6 below.
As can be seen from Table 6, the void fraction of example 3 is significantly lower than that of comparative example 7 and the cleavage strength is significantly higher than that of comparative example 5, indicating that the addition of the binder and the fiber facilitates the mutual nesting of the aggregates, reducing the void fraction and improving the strength. The cleavage strength of example 3 is significantly higher than that of comparative examples 3-6, indicating that the modified emulsified asphalt can enhance the penetration and adhesion of asphalt to aggregate, and enhance the coating of asphalt in the aggregate, thereby enhancing the bonding strength between the aggregate particles and enhancing the bearing effect of the pavement structure.
TABLE 6 Performance data for example 3 and comparative examples 3-7
| Void fraction/% | 15 ℃ cleavage strength/MPa | Dry-wet splitting strength ratio | |
| Example 3 | 9.2 | 0.88 | 82.5 |
| Comparative example 3 | 10.2 | 0.75 | 80.6 |
| Comparative example 4 | 9.8 | 0.79 | 81.3 |
| Comparative example 5 | 9.5 | 0.82 | 81.8 |
| Comparative example 6 | 9.6 | 0.81 | 81.7 |
| Comparative example 7 | 11.8 | 0.77 | 81.2 |
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (6)
1. The old cement concrete pavement reconstruction structure is characterized by sequentially comprising an anti-slip wear-resistant asphalt concrete upper layer, a function-adjustable asphalt concrete lower layer, an asphalt macadam sealing layer, a cold recycled old cement pavement rubble material upper base layer and an old cement concrete pavement rubble lower base layer from top to bottom; the asphalt macadam seal layer is 2-3 cm in thickness and 4000-5000 MPa in modulus of resilience, is a double-layer asphalt macadam layer paved by a layering method, and sequentially comprises a first layer of matrix asphalt, coarse aggregates with the particle size of 10-15 mm, a first layer of matrix asphalt and fine aggregates with the particle size of 5-10 mm from bottom to top, wherein the sprinkling amount of the first layer of matrix asphalt is 0.9-1.1 kg/m 2 Coarse aggregate with particle size of 10-15 mm has sprinkling amount of 10-14 m 3 /1000m 2 The asphalt spraying amount of the second layer of matrix is 0.6-0.8 kg/m 2 Coarse aggregate with particle size of 5-10 mm is sprayed in an amount of 7-9 m 3 /1000m 2 。
2. The old cement concrete pavement reconstruction structure suitable for non-extra heavy traffic grades according to claim 1, wherein the thickness of the upper surface layer of the anti-skid and wear-resistant asphalt concrete is 3-6 cm, and the dynamic modulus is more than 7000MPa.
3. The old cement concrete pavement reconstruction structure suitable for non-extra heavy traffic grades according to claim 1, wherein the thickness of the functionally adjustable asphalt concrete lower surface layer is 5-7 cm, the dynamic stability is more than or equal to 2400 times/mm, and the dynamic modulus is more than or equal to 8000MPa.
4. The old cement concrete pavement reconstruction structure suitable for the non-extra heavy traffic grade according to claim 1, wherein the upper base layer of the cold recycled old cement pavement rubblizing material is an asphalt mixture prepared by performing on-site cold recycling on a rubblizing layer material with the thickness of 8-10 cm on the surface layer of the old cement pavement rubblized by adopting emulsified asphalt or foamed asphalt, the thickness is 8-12 cm, and the rebound modulus is 3000-5000 MPa; the rubblized lower base layer of the old cement concrete pavement is formed by a lower material of the old cement pavement after rubblization, the thickness is 10-15 cm, and the rebound modulus is 1000-1400 MPa.
5. The old cement concrete pavement reconstruction structure suitable for non-extra heavy traffic grade according to claim 4, wherein coarse aggregate, cementing material, stone dust and fiber are further added into the in-situ cold-recycled asphalt mixture, the crushed aggregate, coarse aggregate, cementing material, stone dust and fiber form aggregate in the in-situ cold-recycled asphalt mixture, and the weight ratio of the crushed aggregate, the coarse aggregate, the cementing material, the stone dust and the fiber is 70-80:8-15:3-5:5-8:1-2; the use amount of the emulsified asphalt is 2.5% -3.3% of the weight of the aggregate, and the use amount of the foamed asphalt is 2% -3% of the weight of the aggregate; the coarse aggregate is one or more of limestone, granite and sandstone with the particle size of 10-15 mm, the cementing material is prepared by mixing fly ash, slag, steel slag, quartz powder and tailings according to the weight ratio of 1-2:8-10:4-6:1-3:2-4, the particle size of stone dust is 0-3 mm, the fiber is one or more of basalt fiber, glass fiber and polyester fiber, and the fiber length is 3-18 mm.
6. The old cement concrete pavement improvement structure suitable for non-extra-heavy traffic grades according to claim 4 or 5, wherein the emulsified asphalt is modified emulsified asphalt, and the modified emulsified asphalt consists of the following components in parts by mass: 100-150 parts of emulsified asphalt, 1-3 parts of terpene resin emulsion, 0.03-0.2 part of alkyl glycoside and 0.2-0.5 part of cocamidopropyl hydroxysulfobetaine, wherein the emulsified asphalt is cationic slow cracking emulsified asphalt.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61233102A (en) * | 1985-04-08 | 1986-10-17 | 日瀝化学工業株式会社 | Construction of bitumenous paving body |
| JP2009073701A (en) * | 2007-09-21 | 2009-04-09 | Kao Corp | Emulsifying agent for asphalt emulsion for cement asphalt grout mortar |
| CN104559246A (en) * | 2013-10-22 | 2015-04-29 | 中国石油化工股份有限公司 | Zwitter-ion asphalt warm-mixing agent and preparation method thereof |
| CN204753293U (en) * | 2015-06-08 | 2015-11-11 | 西安公路研究院 | Main line cement concrete pavement " bai jiahei " regeneration structure is economized by state |
| CN106192701A (en) * | 2016-08-22 | 2016-12-07 | 青海省收费公路管理处 | The construction method of repaving asphalt coat after the punishment of concrete road surface under high and cold heavy duty |
| CN210507014U (en) * | 2019-04-10 | 2020-05-12 | 湖南路美工程材料有限公司 | Pavement structure |
| CN111501470A (en) * | 2020-05-14 | 2020-08-07 | 西安市政道桥建设有限公司 | Pavement integral repairing method based on grid flowing water paving and obtained new road |
| CN113215907A (en) * | 2021-05-13 | 2021-08-06 | 中铁五局集团机械化工程有限责任公司 | Asphalt additional paving structure for old concrete pavement of urban road intersection and construction method thereof |
-
2022
- 2022-09-08 CN CN202211092918.4A patent/CN115450086B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61233102A (en) * | 1985-04-08 | 1986-10-17 | 日瀝化学工業株式会社 | Construction of bitumenous paving body |
| JP2009073701A (en) * | 2007-09-21 | 2009-04-09 | Kao Corp | Emulsifying agent for asphalt emulsion for cement asphalt grout mortar |
| CN104559246A (en) * | 2013-10-22 | 2015-04-29 | 中国石油化工股份有限公司 | Zwitter-ion asphalt warm-mixing agent and preparation method thereof |
| CN204753293U (en) * | 2015-06-08 | 2015-11-11 | 西安公路研究院 | Main line cement concrete pavement " bai jiahei " regeneration structure is economized by state |
| CN106192701A (en) * | 2016-08-22 | 2016-12-07 | 青海省收费公路管理处 | The construction method of repaving asphalt coat after the punishment of concrete road surface under high and cold heavy duty |
| CN210507014U (en) * | 2019-04-10 | 2020-05-12 | 湖南路美工程材料有限公司 | Pavement structure |
| CN111501470A (en) * | 2020-05-14 | 2020-08-07 | 西安市政道桥建设有限公司 | Pavement integral repairing method based on grid flowing water paving and obtained new road |
| CN113215907A (en) * | 2021-05-13 | 2021-08-06 | 中铁五局集团机械化工程有限责任公司 | Asphalt additional paving structure for old concrete pavement of urban road intersection and construction method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 掺废旧沥青混合料水泥稳定碎石基层性能研究;谢成;刘平;刘乐平;;公路与汽运(第06期);全文 * |
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