CN115450086A - Old cement concrete pavement reconstruction structure suitable for non-heavy traffic grade and design method - Google Patents
Old cement concrete pavement reconstruction structure suitable for non-heavy traffic grade and design method Download PDFInfo
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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-heavy traffic grades, which comprises the following steps: determining a crushing process according to traffic load, technical conditions of an old cement pavement and environmental conditions; cold regenerating the rubble surface layer material in situ with asphalt to form the rubble upper base layer of the cold regenerated old cement road surface, and measuring the mechanical performance parameters; taking the cracked but unbroken part of the rubble lower base as a lower base material, and measuring the modulus of resilience and the Poisson ratio parameter of the lower base material; designing an asphalt macadam seal coat, an asphalt mixture lower surface layer and an asphalt mixture upper surface layer on the rubblized material upper base layer; checking and calculating the structural parameters of the pavement; and obtaining the old cement concrete pavement reconstruction structure. The invention combines the old cement concrete pavement reconstruction structure design and the material design together, improves the design quality of the pavement reconstruction structure, greatly improves the integrity of the pavement structure, improves the pavement reconstruction efficiency and prolongs the service life of the reconstructed pavement.
Description
Technical Field
The invention belongs to the technical field of old cement concrete pavement reconstruction, and particularly relates to a reconstruction structure and a design method of an old cement concrete pavement suitable for non-heavy traffic grades.
Background
By the end of 2012, the total mileage of the cement concrete pavement in China reaches 165.3 kilometers, and the cement concrete pavement is one of the most countries in the world. However, as the traffic volume increases, under the combined action of the traffic load and the natural environment, the cement concrete pavement inevitably has diseases such as fracture, settlement, slab staggering, mud pumping and the like, and the generation and development of the diseases are further aggravated by the increase of heavy-load and overloaded vehicles. Therefore, effective measures must be taken to enhance the maintenance and repair of the cement concrete pavement.
At present, the technology for reforming the old cement concrete pavement mainly comprises the following two modes: paving a cement concrete pavement (white plus white) on the cement concrete pavement; and (II) paving an asphalt concrete pavement on the cement concrete pavement. The mode has two different structural forms: (1) After the maintenance treatment of the cement concrete pavement, additionally laying an intermediate transition layer, and then laying an asphalt surface layer (white and black); (2) After the cement concrete pavement is crushed, the cement concrete pavement is compacted (or a base course is additionally paved), and then an asphalt surface layer is paved (the white is changed into the black), namely the rubblization reconstruction is carried out.
The asphalt concrete surface layer is additionally paved after the old cement concrete pavement is rubblized, so that the stress characteristic of the pavement can be improved, and the service performance of the pavement is improved; however, the old cement panel is granular in the range of 10cm after rubblization, contains more powdery fine particles and has poor bearing capacity. The conventional emulsified asphalt can not be permeated and stabilized, so that the connection among particles is very weak, and the force bearing effect can not be realized, thereby causing the diseases such as cracking and the like of the subsequent asphalt pavement.
Disclosure of Invention
The invention aims to provide an old cement concrete pavement reconstruction structure suitable for non-heavy traffic grades and a design method thereof, and overcomes the defects of weak bearing effect, short service life and the like existing after the existing old cement concrete pavement is reconstructed.
In order to realize the aim, the invention provides a design method of an old cement concrete pavement reconstruction structure suitable for non-heavy traffic grades, which comprises the following steps:
(1) Determining a crushing process of the old cement concrete panel according to traffic load, technical conditions of the old cement pavement and environmental conditions of the old pavement;
(2) Taking the cracked but unbroken part of the rubblized lower base layer as a lower base layer material, and measuring the modulus of resilience and Poisson ratio parameters of the lower base layer;
(3) Adding coarse aggregate, stone chips, a cementing material prepared from industrial solid wastes and fibers on a rubble layer material on the rubble surface layer, spreading the cementing material and the fibers on the rubble surface, forming an upper base layer of a cold-recycled old cement pavement rubble material by adopting foamed asphalt or emulsified asphalt through an in-situ cold recycling process, and measuring the dynamic resilience modulus, the Poisson ratio and the dynamic stability of the upper base layer;
(4) Paving an asphalt macadam seal layer on an upper base layer of a rubble layer material of an in-situ cold-recycled old cement pavement, then opening traffic, and increasing the compactness of the asphalt macadam seal layer through vehicle rolling;
(5) Designing a lower surface layer and an upper surface layer of the asphalt mixture on the asphalt macadam seal coat to preliminarily obtain a pavement structure;
(6) Adopting an elastic layered system theory to check and calculate the structural parameters of the pavement;
(7) Obtaining the reconstruction structure scheme of the old cement concrete pavement suitable for the non-heavy traffic grade.
Preferably, in the above method for designing a non-heavy traffic grade old cement concrete pavement reconstruction structure, 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 calculated by adopting an elastic layered system theory, and the vertical shear stress of the upper base layer of the cold-recycling old cement pavement rubblized material is calculated by adopting a molar coulomb theory.
The utility model provides an old cement concrete pavement reforms transform structure suitable for non-heavy traffic grade, adopts foretell design method that is applicable to non-heavy traffic grade's old cement concrete pavement reforms transform structure to design, old cement concrete pavement reforms transform the structure, and top-down includes wear-resisting asphalt concrete upper strata of antiskid, the adjustable type asphalt concrete lower surface course of function, pitch rubble seal, cold regeneration old cement pavement rubble material upper base layer, old cement concrete pavement rubble lower base layer in proper order.
Preferably, in the old cement concrete pavement reconstruction structure suitable for the non-heavy traffic grade, the thickness of the upper layer of the anti-skid and wear-resistant asphalt concrete is 3-6 cm, and the dynamic modulus is more than 7000MPa.
Preferably, in the above old cement concrete pavement modification structure suitable for the non-heavy traffic grade, the upper layer of the anti-skid wear-resistant asphalt concrete is made of AC type asphalt concrete, SMA type asphalt concrete or Superpave type asphalt concrete of diabase or basalt.
Preferably, in the old cement concrete pavement reconstruction structure suitable for the non-heavy traffic grade, the thickness of the lower surface layer of the functionally adjustable asphalt concrete is 5 to 7cm, 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 old cement concrete pavement modification structure suitable for the non-heavy traffic grade, the lower surface layer of the functionally-adjustable asphalt concrete is an AC-20, AC-25 or ATB-25 type 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-heavy traffic grade, the thickness of the asphalt macadam sealing layer is 2-3cm, and the modulus of resilience is 4000-5000 MPa.
Preferably, upperIn the old cement concrete pavement reconstruction structure suitable for the non-heavy traffic grade, the asphalt macadam seal layer is a double-layer asphalt macadam layer paved by a layer paving method, and sequentially comprises a first layer of matrix asphalt, coarse aggregates with the grain diameter of 10-15mm, a first layer of matrix asphalt and fine aggregates with the grain diameter of 5-10mm from bottom to top, wherein the spreading amount of the first layer of matrix asphalt is 0.9-1.1kg/m 2 The spreading amount of coarse aggregates with the particle size of 10-15mm is 10-14m 3 /1000m 2 The spreading amount of the second layer of base asphalt is 0.6 to 0.8kg/m 2 The spreading amount of coarse aggregate with the particle size of 5 to 10mm is 7 to 9m 3 /1000m 2 。
Preferably, in the old cement concrete pavement reconstruction structure suitable for the non-heavy traffic grade, the cold-recycled old cement pavement rubble material upper base layer is an asphalt mixture obtained by performing in-situ cold recycling on a rubble layer material with the thickness of 8-10cm after rubble of the old cement pavement by using emulsified asphalt or foamed asphalt, wherein the thickness is 8-12cm, and the resilience modulus is 3000-5000 mpa; the rubblized lower base layer of the old cement concrete pavement is made of a lower material subjected to rubblization of the old cement pavement, the thickness is 10 to 15cm, and the resilience modulus is 1000 to 1400MPa. After the old cement pavement is rubble, two layers of different materials can be formed, the rubble layer material on the surface layer is uneven in particle size crushing and low in bearing capacity, the rubble layer is a weak layer of the whole pavement structure layer, the rubble layer is solidified by adopting a cold in-place regeneration process, the granular materials are solidified into asphalt concrete, and the bearing capacity of the pavement is remarkably improved.
Preferably, in the old cement concrete pavement reconstruction structure applicable to the non-heavy traffic grade, coarse aggregates, gelled materials, stone chips and fibers are further added into the asphalt mixture subjected to cold in-place recycling, the aggregate in the asphalt mixture subjected to cold in-place recycling is composed of rubble layer materials, coarse aggregates, gelled materials, stone chips and fibers, and the weight ratio of rubble layer materials, coarse aggregates, gelled materials, stone chips and fibers is 70 to 80; the dosage of the emulsified asphalt is 2.5-3.3% of the aggregate, and the dosage 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 to 15mm, 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 to 2 to 8 to 10.
Preferably, in the above old cement concrete pavement renovation structure suitable for the non-heavy traffic grade, the specific construction process of the upper base layer of the rubble material of the cold-recycling old cement pavement is as follows: after the old cement pavement is rubblized, a rubble material conveying vehicle and a powder tank truck are adopted to spread the cementing materials and fibers prepared from coarse aggregates, stone chips and industrial solid wastes on the pavement after rubblization, the rubble surface layer material is stirred on the spot by an on-site cold regeneration device, foamed asphalt or emulsified asphalt is added for solidification, after uniform stirring, the mixture is conveyed to a paving device for paving and rolling to form a foamed asphalt or emulsified asphalt mixture base layer.
Preferably, in the above old cement concrete pavement modification structure suitable for the non-heavy traffic grade, the emulsified asphalt is modified emulsified asphalt, and the modified emulsified asphalt is composed of the following components in parts by mass: 100 to 150 parts of emulsified asphalt, 1 to 3 parts of terpene resin emulsion, 0.03 to 0.2 part of alkyl glycoside and 0.2 to 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 method for designing the old cement concrete pavement reconstruction structure suitable for the non-heavy traffic grade combines the old cement concrete pavement reconstruction structure design and the material design together, 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 durable service life.
2. The old cement concrete pavement reconstruction structure suitable for the non-heavy traffic grade divides the old cement pavement into two layers after rubblization, takes the lower rubblized layer as a lower base layer, has the characteristic of cracking but not breaking and has stronger bearing effect; the foamed asphalt or emulsified asphalt is adopted to solidify the upper layer granular material as the base layer, so that a weak layer is eliminated, the bearing capacity of the pavement is obviously improved, and the anti-rutting performance of the pavement is improved; the characteristics of the asphalt macadam seal coat as a pavement structure layer are strengthened, the modulus range is defined, 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 old cement concrete pavement reconstruction structure suitable for the non-heavy traffic grade fully utilizes the rubblized aggregate of the old cement pavement, adopts emulsified asphalt and foamed asphalt to carry out on-site cold regeneration, improves the construction efficiency, and is beneficial to quickly opening traffic; by adding coarse aggregates, stone chips, fibers and a cementing material prepared from industrial solid wastes and mutually embedding the aggregates, the integrity and stability of the upper base layer of the cold-recycling old cement pavement rubble material can be improved, and the mechanical property is improved.
4. The invention is suitable for the old cement concrete pavement reconstruction structure of the non-heavy traffic grade, modifies the emulsified asphalt, improves the penetration and adhesion of the asphalt to aggregates, and improves the distribution uniformity of the asphalt in the aggregates, thereby improving the bonding strength among aggregate particles and improving the load-bearing effect of the pavement structure.
Drawings
Fig. 1 is a design flowchart of a used cement concrete pavement renovation structure suitable for non-heavy traffic grade in embodiment 1 of the invention.
FIG. 2 is a schematic diagram of the reconstruction structure of the old cement concrete pavement suitable for non-heavy traffic grade.
Description of the main reference numerals:
1-an anti-skid wear-resistant asphalt concrete upper surface layer, 2-a function-adjustable asphalt concrete lower surface layer, 3-an asphalt macadam seal layer, 4-a cold-recycling 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 provided, but it should be understood that the scope of the invention is not limited to the specific embodiments.
Example 1
A design method of an old cement concrete pavement reconstruction structure suitable for non-heavy traffic grades is provided, the design flow is shown as figure 1, and the method comprises the following steps:
(1) Determining a crushing process of an old cement concrete panel according to traffic load, technical conditions of an old cement pavement and environmental conditions of an old road, adopting a resonance rubblization crushing mode for structural sections of villages, towns, culverts, bridges and the like, and adopting a multi-hammer rubblization mode for other sections;
(2) Taking the cracked but unbroken part of the rubblized lower base layer as a lower base layer material, and measuring the modulus of resilience and Poisson ratio parameters of the lower base layer;
(3) Adding coarse aggregate, stone chips, cementing materials prepared by industrial solid wastes and fibers on a rubble layer material with the thickness of 8-10cm on the rubble upper surface layer, spreading the cementing materials and the fibers on the rubble pavement, forming an upper base layer of the rubble material of the cold-recycled old cement pavement by adopting a foamed asphalt or emulsified asphalt through an in-situ cold regeneration process, and measuring the dynamic resilience modulus, the Poisson ratio and the dynamic stability of the upper base layer;
(4) Paving an asphalt macadam seal layer on an upper base layer of a rubble layer material of an in-situ cold-recycled old cement pavement, then opening traffic, and increasing the compactness of the asphalt macadam seal layer through vehicle rolling;
(5) Designing a lower surface layer and an upper surface layer of the asphalt mixture on the asphalt macadam seal coat to preliminarily obtain a pavement structure;
(6) Adopting an elastic layered system theory, checking and calculating the fatigue cracking life of the asphalt mixture, the permanent deformation of an asphalt mixture layer and the vertical compressive strain of the top surface of the roadbed; the vertical shear stress of the upper base layer of the rubblized material of the cold-regenerated old cement pavement is checked and calculated by adopting a molar coulomb theory;
(7) Obtaining the reconstruction structure scheme of the old cement concrete pavement suitable for the non-heavy traffic grade.
The old cement concrete pavement reconstruction structure suitable for the non-heavy traffic grade of the embodiment, as shown in fig. 2, sequentially comprises, from top to bottom: the upper surface layer 1 of the anti-skid wear-resistant asphalt concrete 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; an asphalt macadam seal layer 3, a cold-regenerated old cement pavement rubble material upper base layer 4 (an asphalt mixture obtained by performing in-situ cold regeneration on rubble layer materials on the surface layer of an old cement pavement after rubble by emulsified asphalt or foamed asphalt); and the old cement concrete pavement rubblized lower base 5. The technical parameters of thickness, modulus, poisson's ratio and the like of each layer are shown in table 1.
Table 1 table of technical parameters of each layer of the pavement structure of example 1
| Pavement structure layer material | Thickness (cm) | Modulus (MPa) | Poisson ratio | Permanent deformation (mm) |
| Common AC-16 |
4 | 8000 | 0.25 | 1.5 |
| Common AC-20 |
5 | 9000 | 0.25 | 2.5 |
| Asphalt |
3 | 5000 | 0.25 | 2.5 |
| On-site cold regeneration old cement road rubble material upper base layer | 13 | 4500 | 0.25 | 2.5 |
| Old cement concrete pavement rubblization lower base course | 10 | 1000 | 0.35 |
The road surface structure of the embodiment adopts 100KN standard axle load, and the frequency of the axle load action is 8.4 multiplied by 10 6 Secondly, the traffic type is heavy-load traffic; according to the current standard of China, namely the design standard of road asphalt pavement (JTG D50-2017), the method is used for heavy-load traffic; calculated by adopting an elastic layered system theory, the cumulative action times of equivalent design axle load on the designed driveway within the design service life is 3.5 multiplied by 10 7 The number of axes; the bottom tensile strain of the asphalt layer is epsilon =93.5 multiplied by 10 -6 (ii) a Vertical compressive strain epsilon =182 x 10 of roadbed top surface -6 (ii) a The permanent deformation RA =14.32mm of the asphalt mixture layer.
Comparative example 1
This comparative example is traditional road surface structure, and top-down includes in proper order: the concrete comprises 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 broken stone layer; the technical parameters of thickness, modulus, poisson's ratio and the like 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 structure layer material | Thickness (cm) | Modulus (MPa) | Poisson ratio | Permanent deformation (mm) |
| Common AC-16 |
4 | 8000 | 0.25 | 1.5 |
| Ordinary AC-20 |
5 | 9000 | 0.25 | 2.5 |
| Graded broken stone base | 22 | 400 | 0.35 | |
| Old cement pavement rubble layer | 10 | 600 | 0.35 |
The maximum cumulative equivalent number of axles that the pavement structure of this comparative example can withstand is 3.5 × 10 6 Secondly, light traffic load; the cumulative action frequency of equivalent design axle load on the design lane in the design service life is 8.6 multiplied by 10 6 The number of axes; the tensile strain of the asphalt layer is epsilon =114.4 multiplied by 10 -6 (ii) a Vertical compressive strain epsilon =187 multiplied by 10 of roadbed top surface -6 (ii) a The permanent deformation RA of the asphalt mixture layer is =5.55mm.
In the embodiment 1, the economic asphalt macadam disposal layer is added, so that the fatigue resistance of the pavement structure can be improved; the cold regeneration process is adopted to solidify the dispersed granular material on the upper layer of the rubble of the old cement pavement, and the lower layer is a compact rubble lower base layer with the characteristic of cracking but not breaking. Compared with comparative example 1, example 1 can bear heavy traffic, the service life is 4 times of that of comparative example 1, and the asphalt layer bottom tensile strain is obviously lower than that of comparative example 1.
Example 2
An old cement concrete pavement reconstruction structure suitable for non-heavy traffic grades, as shown in figure 2, sequentially comprises from top to bottom: the upper surface layer 1 of the anti-skid wear-resistant asphalt concrete is made of modified AC-16 asphalt concrete; the lower surface layer 2 of the function adjustable asphalt concrete is made of high-modulus AC-20 asphalt concrete; an asphalt macadam seal layer 3 and a cold-regenerated old cement pavement rubble material upper base layer 4; and 5, rubblizing the lower base layer of the old cement concrete pavement. The technical parameters of thickness, modulus, poisson's ratio and the like of each layer are shown in table 3.
Table 3 table of technical parameters of each layer of the pavement structure of example 2
| Pavement structure layer material | Thickness (cm) | Modulus (MPa) | Poisson ratio | Permanent deformation (mm) |
| Modified AC-16 |
4 | 8000 | 0.25 | 1.5 |
| High modulus AC-20 |
5 | 12000 | 0.25 | 2.5 |
| Asphalt |
3 | 5000 | 0.25 | 2.5 |
| Cold-regenerated old cement road rubblized material upper base layer | 10 | 4500 | 0.25 | 2.5 |
| Rubblized lower layer of old cement pavement | 10 | 1000 | 0.35 |
The road surface structure of the embodiment adopts 100KN standard axle load, and the frequency of the axle load is 9.2 multiplied by 10 6 Secondly; according to the current standard of China, namely 'design Standard of asphalt pavement for roads' (JTG D50-2017), the method is used for heavy-load traffic; calculated by adopting an elastic layered system theory, the cumulative action frequency of equivalent design axle load on a design lane in the design service life is 3.8 multiplied by 10 7 The number of axes; the tensile strain of the asphalt layer is epsilon =104.3 multiplied by 10 -6 (ii) a Vertical compression strain epsilon =184 x 10 of roadbed top surface -6 (ii) a The permanent deformation RA =14.23mm of the asphalt mixture layer. And the standard requirement is met.
Comparative example 2
This comparative example is traditional road surface structure, and top-down includes in proper order: an upper graded asphalt concrete surface layer, a lower dense graded asphalt concrete surface layer, a low-dosage cement stable graded macadam base layer (the cement dosage is 1.5-2%, and the resilience modulus is 800-1000MPa), and an old cement pavement macadam layer; the technical parameters of thickness, modulus, poisson's ratio, etc. 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 structure layer material | Thickness (cm) | Modulus (MPa) | Poisson ratio | Permanent deformation (mm) |
| Modified AC-16 |
4 | 8000 | 0.25 | 1.5 |
| Common AC-20 |
5 | 9000 | 0.25 | 2.5 |
| Low-dosage cement stable graded broken stone base | 30 | 800 | 0.35 | |
| Old cement pavement rubble layer | 10 | 600 | 0.35 |
The comparative example adopts a modified AC-16 asphalt concrete upper surface layer and a low-dose cement stable graded macadam base layer. The maximum cumulative equivalent number of axles that the pavement structure of this comparative example can withstand is 3.84 × 10 6 Secondly, the load is light traffic load; the cumulative action frequency of equivalent design axle load on the design lane in the design service life is 9.49 multiplied by 10 6 The number of axes; the bottom tensile strain of the asphalt layer is epsilon =112.6 multiplied by 10 -6 (ii) a Vertical compressive strain epsilon =149 x 10 of roadbed top surface -6 (ii) a The permanent deformation RA of the asphalt mixture layer is =5.71mm.
In the embodiment 2, the asphalt macadam seal coat is added, so that the fatigue resistance of the pavement structure can be improved; adopting a modified AC-16 asphalt concrete upper surface layer; emulsified asphalt or foamed asphalt is adopted to solidify the loose granular material of the crushed stone layer of the old cement pavement as an upper base layer, and the lower crushed stone layer with the characteristic of cracking but not crushing is used as a lower base layer. Compared with the comparative example 2, the asphalt layer of the embodiment 1 can bear heavy traffic, the service life of the asphalt layer is 4 times that of the comparative example 1, and the bottom tensile strain of the asphalt layer is obviously lower than that of the comparative example 1. Example 2 can withstand heavy traffic and has a service life 3.6 times longer than that of comparative example 1, and the asphalt layer has a lower tensile strain than that of comparative example 2.
The vertical shear stress of example 2 and comparative example 2 is shown in table 5, and it can be seen 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 regeneration old cement pavement rubble material upper base layer material, in particular to an asphalt mixture which is prepared by carrying out cold regeneration on a rubble layer material (the particle size is 0.075mm to 31.5mm) with the thickness of a surface layer after rubble of an old cement pavement by using emulsified asphalt, wherein the weight ratio of the rubble layer material, the coarse aggregate, the cementing material, the stone chips and the fibers is (75); the coarse aggregate is limestone with a particle size of 10 to 15mm, the cementing material is prepared by mixing industrial solid waste fly ash, slag, steel slag, quartz powder and tailings in a weight ratio of (1.5). 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 the same as example 3 except that: the emulsified asphalt of this comparative example was BC-1 emulsified asphalt.
Comparative example 4
This comparative example is the same as example 3 except that: the modified emulsified asphalt of the comparative example consists of 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 the same as example 3 except that: the modified emulsified asphalt of the comparative example consists of 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 the same as example 3 except that: the modified emulsified asphalt of the comparative example consists of 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 the same as example 3 except that: the comparative example contained no gelling material and no fibres.
And preparing cold-recycling asphalt mixtures from the examples 3 and the comparative examples 3 to 7 by adopting special cold-recycling mixing equipment. In a laboratory, the cold recycled asphalt concrete prepared in example 3 and comparative examples 3 to 7 was used to prepare marshall test pieces according to technical specification for road asphalt pavement recycling (JTG/T5521-2019), specifically: respectively compacting two indoor surfaces by Marshall for 50 times, putting into a ventilation oven, regulating the temperature to 60 ℃, preserving for 48 hours, respectively compacting two indoor surfaces for 25 times after taking out, compacting, standing for 14 hours at room temperature, and demolding; the prepared marshall test specimens were characterized according to the highway engineering asphalt and asphalt mixture test protocol (JTG E20-2011) and the results are shown in table 6 below.
As can be seen from Table 6, the void ratio of example 3 is significantly lower than that of comparative example 7, and the splitting strength is significantly higher than that of comparative example 5, which shows that the addition of the gelling material and the fibers facilitates the mutual embedment of aggregates, reduces the void ratio and improves the strength. The splitting strength of the embodiment 3 is obviously higher than that of the comparative examples 3 to 6, which shows that the modified emulsified asphalt can enhance the penetration and adhesion of asphalt to aggregates and improve the coating of asphalt in the aggregates, thereby improving the bonding strength among aggregate particles and enhancing the load-bearing effect of a pavement structure.
TABLE 6 Performance data for example 3 and comparative examples 3 to 7
| Void fraction/%) | Cleavage strength at 15 ℃ MPa | Dry to wet split 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 description of specific exemplary embodiments of the invention has been presented for the 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 certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and 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 (10)
1. A design method of an old cement concrete pavement reconstruction structure suitable for non-heavy traffic grades is characterized by comprising the following steps:
(1) Determining a crushing process of the old cement concrete panel according to traffic load, technical conditions of the old cement pavement and environmental conditions of the old pavement;
(2) Taking the cracked but unbroken part of the rubble lower base layer as a lower base layer material, and measuring the modulus of resilience and the Poisson ratio parameter of the lower base layer;
(3) Adding coarse aggregate, stone chips, a cementing material prepared from industrial solid wastes and fibers on a rubble layer material on the rubble surface layer, spreading the cementing material and the fibers on the rubble surface, forming an upper base layer of a cold-recycled old cement pavement rubble material by adopting foamed asphalt or emulsified asphalt through an in-situ cold recycling process, and measuring the dynamic resilience modulus, the Poisson ratio and the dynamic stability of the upper base layer;
(4) Paving an asphalt macadam seal layer on the rubblized layer material of the in-situ cold recycled old cement pavement;
(5) Designing a lower surface layer and an upper surface layer of the asphalt mixture on the asphalt macadam seal coat to preliminarily obtain a pavement structure;
(6) Checking and calculating the structural parameters of the pavement;
(7) Obtaining the reconstruction structure scheme of the old cement concrete pavement suitable for the non-heavy traffic grade.
2. The method for designing a reconstruction structure of an old cement concrete pavement suitable for non-heavy traffic grades according to claim 1, wherein the step (6) comprises the steps of checking 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 by an elastic layered system theory, and checking the vertical shear stress of the upper base layer of the rubble materials of the cold-recycled old cement pavement by a Moore Coulomb theory.
3. The old cement concrete pavement reconstruction structure suitable for the non-heavy traffic grade is characterized by being designed by adopting the design method of the old cement concrete pavement reconstruction structure suitable for the non-heavy traffic grade as claimed in claim 1 or 2, and sequentially comprising an anti-slip wear-resistant asphalt concrete upper surface layer, a functionally adjustable asphalt concrete lower surface layer, an asphalt macadam seal 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.
4. The old cement concrete pavement reconstruction structure applicable to non-heavy traffic grades as claimed in claim 3, wherein the thickness of the upper layer of the anti-skid and wear-resistant asphalt concrete is 3-6 cm, and the dynamic modulus is greater than 7000MPa.
5. The old cement concrete pavement transformation structure applicable to the non-heavy traffic grade according to claim 3, wherein the thickness of the lower surface layer of the functionally adjustable asphalt concrete is 5 to 7cm, the dynamic stability is more than or equal to 2400 times/mm, and the dynamic modulus is more than or equal to 8000MPa.
6. The old cement concrete pavement reconstruction structure applicable to non-heavy traffic grades as claimed in claim 3, wherein the thickness of the asphalt macadam seal is 2-3 cm, and the modulus of resilience is 4000-5000 MPa.
7. The old cement concrete pavement reconstruction structure applicable to the non-heavy traffic grade according to claim 6, wherein the asphalt macadam seal is a double-layer asphalt macadam layer laid by a layer-laying method, and sequentially comprises a first layer of matrix asphalt, coarse aggregates with the particle size of 10-15mm, a first layer of matrix asphalt and fine aggregates with the particle size of 5-10mm from bottom to top, wherein the spreading amount of the first layer of matrix asphalt is 0.9-1.1kg/m 2 The spreading amount of coarse aggregate with the particle size of 10 to 15mm is 10 to 14m 3 /1000m 2 The spraying amount of the second layer of the base asphalt is 0.6 to 0.8kg/m 2 The spreading amount of coarse aggregates with the particle size of 5-10mm is 7-9m 3 /1000m 2。
8. The old cement concrete pavement transformation structure suitable for the non-heavy traffic grade according to claim 3, wherein the cold-recycled old cement pavement rubble material upper base layer is an asphalt mixture obtained by carrying out in-situ cold recycling on a rubble layer material with the thickness of 8-10 cm after rubble of an old cement pavement by emulsified asphalt or foamed asphalt, the thickness of the asphalt mixture is 8-10 cm, and the resilience modulus of the asphalt mixture is 3000-5000 MPa; the rubblized lower base layer of the old cement concrete pavement is made of a lower material subjected to rubblization of the old cement pavement, the thickness of the lower base layer is 10-15cm, and the modulus of resilience of the lower base layer is 1000-1400 MPa.
9. The old cement concrete pavement reconstruction structure applicable to non-heavy traffic grades according to claim 8, wherein coarse aggregates, a cementing material, stone chips and fibers are further added into the asphalt mixture subjected to cold in-place recycling, and the rubble layer material, the coarse aggregates, the cementing material, the stone chips and the fibers form aggregates in the asphalt mixture subjected to cold in-place recycling, wherein the weight ratio of the rubble layer material, the coarse aggregates, the cementing material, the stone chips and the fibers is 70 to 80; the dosage of the emulsified asphalt is 2.5-3.3% of the weight of the aggregate, and the dosage of the foamed asphalt is 2-3% of the weight of the mixed aggregate; the coarse aggregate is one or more of limestone, granite and sandstone with the particle size of 10-15mm, the cementing material is prepared by mixing fly ash, slag, steel slag, quartz powder and tailings according to the weight ratio of 1-2 to 8-10 to 1-3 to 2-4, the particle size of the stone chip is 0-3mm, the fiber is one or more of basalt fiber, glass fiber and polyester fiber, and the fiber length is 3-18mm.
10. The old cement concrete pavement reconstruction structure applicable to the non-heavy traffic grade according to claim 8 or 9, characterized in that the emulsified asphalt is modified emulsified asphalt, and the modified emulsified asphalt comprises the following components in parts by mass: 100 to 150 parts of emulsified asphalt, 1 to 3 parts of terpene resin emulsion, 0.03 to 0.2 part of alkyl glycoside and 0.2 to 0.5 part of cocamidopropyl hydroxysulfobetaine. The emulsified asphalt is cation slow-cracking emulsified asphalt.
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