CN113026470A - Enhanced base-surface layer interlayer bonding combined structure and optimization method thereof - Google Patents
Enhanced base-surface layer interlayer bonding combined structure and optimization method thereof Download PDFInfo
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- CN113026470A CN113026470A CN202110323616.2A CN202110323616A CN113026470A CN 113026470 A CN113026470 A CN 113026470A CN 202110323616 A CN202110323616 A CN 202110323616A CN 113026470 A CN113026470 A CN 113026470A
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- 239000011229 interlayer Substances 0.000 title claims abstract description 74
- 239000002344 surface layer Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005457 optimization Methods 0.000 title description 4
- 239000010410 layer Substances 0.000 claims abstract description 123
- 239000010426 asphalt Substances 0.000 claims abstract description 63
- 238000009826 distribution Methods 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 claims description 31
- 239000000835 fiber Substances 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 20
- 238000003892 spreading Methods 0.000 claims description 14
- 230000007480 spreading Effects 0.000 claims description 14
- 239000002131 composite material Substances 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 11
- 238000010008 shearing Methods 0.000 claims description 7
- 239000003365 glass fiber Substances 0.000 claims description 4
- 150000001768 cations Chemical class 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000007788 roughening Methods 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 2
- 239000003245 coal Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- 150000001450 anions Chemical class 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 3
- 239000004568 cement Substances 0.000 description 4
- 239000004575 stone Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 125000000129 anionic group Chemical group 0.000 description 2
- 239000011384 asphalt concrete Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007586 pull-out test Methods 0.000 description 1
- 238000000275 quality assurance Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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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
- E01C7/325—Joining different layers, e.g. by adhesive layers; Intermediate layers, e.g. for the escape of water vapour, for spreading stresses
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Abstract
The invention discloses an enhanced base-surface layer interlayer bonding combined structure and a preferred method thereof, belonging to the technical field of road structure engineering. The invention also discloses a preferable method of the interlayer bonding combined structure, which can directly and accurately determine the optimal distribution scheme of the interlayer bonding combined structure of the base layer and the surface layer of the semi-rigid base layer asphalt pavement, is very important for designing and ensuring the quality of the interlayer bonding layer of the upper and lower heterostructure similar to the semi-rigid base layer asphalt pavement, and has guiding significance for the field construction of the interlayer bonding layer.
Description
Technical Field
The invention relates to the technical field of road structure engineering, in particular to an enhanced base-surface interlayer bonding combined structure and a preferred method thereof.
Background
Due to the ever-increasing traffic volume and the rapidly-enhanced awareness of traffic safety, the requirements for road engineering construction are also increasing, and particularly higher requirements are put forward for the performance of road structures. The surface layer and the base layer are bonded with each other, the surface layer and the base layer are of heterogeneous structures, the upper material and the lower material are different, the modulus and the deformability of the upper structure layer and the lower structure layer are greatly different, the physical mechanical properties of the upper structure layer and the lower structure layer are obviously different, and the mechanical response behaviors of the structure layers respectively formed by the two materials under the same load action are also obviously different. Through experimental research, under the same temperature and load condition, the interlayer strain transfer effect of the homogeneous material is good and close to a continuous state, and the interlayer strain transfer of the heterogeneous material is poor and discontinuous. Research shows that when the upper layer and the lower layer are made of heterogeneous materials, the stress on the upper layer structure is more unfavorable. Therefore, the design of the top layer requires consideration of uniformity of properties of the respective structural layers, and interlayer adhesion is important for the top layer and the base layer to be in contact as a heterostructure.
The adhesion between the base layer and the surface layer is often a weak link in the pavement structure, and due to the heterogeneity of the upper structure and the lower structure, the adhesion between the layers often fails in a short time, which is extremely unfavorable for the driving and maintenance of the pavement. The existing pavement structure mainly has the problems of weak interlayer bonding strength, poor pavement structure integrity, easy generation of interlayer reflection cracks and the like, and is simultaneously damaged by pavement water for a long time, so that the service life of a road is short. And the disposal between the base layer and the surface layer in the existing pavement is not perfect, although a double-layer interlayer combination structure of 'permeable layer + sealing layer' is adopted, the two layers are simply combined, and the combined optimization treatment is not carried out. Based on the method, the enhanced combination form of the transparent layer and the sealing layer between the base layer and the surface layer is optimized, so that the interlayer bonding is more effective, and the interlayer material is more fully utilized.
Disclosure of Invention
Aiming at the defects or shortcomings, the invention aims to provide an enhanced base-surface interlayer bonding combined structure and a preferable method thereof, which can effectively solve the problems of weak interlayer bonding strength, poor pavement structural integrity, easy generation of interlayer reflection cracks and the like in the existing pavement structure.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an enhanced base-surface interlayer bonding combined structure which comprises a sealing layer and a permeable layer, wherein the sealing layer is sequentially provided with a rubble layer, an asphalt layer I, a fiber layer and an asphalt layer II from top to bottom.
Furthermore, the reinforced base-surface layer interlayer bonding combined structure provided by the invention is suitable for interlayer bonding of upper and lower heterogeneous pavement structures.
Further, the upper and lower heterogeneous road surface structures are between the surface layer and the base layer.
Furthermore, the gravel layer is made of 5-10mm single-particle-size gravel materials, the coverage rate is 70-85%, and the FI value is 10-20%.
Further, the permeable layer is made of emulsified asphalt permeable layer oil, including but not limited to cationic emulsified asphalt, anionic emulsified asphalt or coal asphalt, and the thickness of the permeable layer oil is 1-3 cm.
Furthermore, the asphalt layer I and the asphalt layer II are both made of rubber modified asphalt or PCR modified emulsified asphalt.
Furthermore, the thickness of the first asphalt layer is 0.8-1.2 cm, and the thickness of the second asphalt layer is 0.8-1.2 cm.
Furthermore, the fiber layer is made of glass fiber, the length is 6-10 cm, and the spreading amount is 100-200 kg/m2The thickness of the film is 1-2 cm.
The invention also provides a preferable method of the reinforced base-surface layer interlayer bonding combined structure, which comprises the following steps:
step (1): calculating the average minimum size ALD of the scattered aggregates;
step (2): calculating the spreading rate R of the binding material;
and (3): determining a fiber distribution mode;
and (4): determining a combination scheme of the interlayer bonding combination structure through a shear test and a drawing test;
and (5): according to the combination scheme of the interlayer bonding combination structure determined in the step (4), roughening treatment is carried out between the surface layer and the base layer, then penetrating oil is sprayed, then sealing layers are constructed step by step according to the sequence of asphalt, fiber, asphalt and gravel, and finally surface layer laying is carried out.
Further, the formula for calculating the average minimum dimension ALD of the scattered aggregate in step (1) is as follows:
wherein ALD-average minimum size of aggregate, mm;
d50-mesh size, mm, corresponding to 50% passage;
FI-needle flake coefficient (mass percentage of needle-flake particles to total mass of aggregate)%.
Further, the formula for calculating the spreading rate R of the binder in the step (2) is as follows:
R＝ALD×0.2×0.7×k
wherein, the distribution rate of the R-binding material is L/m2(ii) a ALD-average minimum size of aggregate, mm; k-rubble coverage.
Further, the step (3) determines that the distribution mode of the fibers is disorderly and uniformly distributed.
Further, the specific process of determining the combination scheme of the interlayer bonding combination structure through the shear test and the drawing test in the step (4) is as follows: formulating a combination scheme of the interlayer bonding combination structure, manufacturing a composite test piece containing the interlayer bonding structure, respectively carrying out a shear test and a drawing test under different temperature conditions, then drawing intensity stress value radar charts corresponding to different combinations, and determining the optimal interlayer bonding combination structure; wherein the temperature range is-10 ℃ to 50 ℃, the shearing rate in the shearing test is 50mm/min to 65mm/min, and the drawing rate in the drawing test is 10mm/min to 20 mm/min.
Further, the shear rate in the shear test in the step (4) was 50mm/min, and the drawing rate in the drawing test was 10 mm/min.
The invention has the following advantages:
1. the invention provides an enhanced base-surface interlayer bonding combined structure based on a permeable layer and a sealing layer, wherein the permeable layer is emulsified asphalt, has good permeability and can penetrate into a base layer to a certain depth, so that the base layer and a lower layer are firmly bonded to form a complete whole; meanwhile, the sealing layer is paved with fibers and asphalt, so that the strain transmission between layers and the stress of an upper layer structure in the upper and lower heterostructure can be obviously improved, the bonding strength between layers is effectively improved, the water damage of a pavement is prevented, and the generation of reflection cracks between layers is effectively restrained. Various pavement damages caused by interlayer bonding failure of the pavement structure are reduced, and interlayer bonding among the heterostructure is improved, so that the service life of the pavement is prolonged;
2. the invention provides a preferred method of the interlayer bonding composite structure of the enhanced base-surface course, which can directly and accurately determine the optimal spreading scheme of the interlayer bonding composite structure of the base-surface course of the semi-rigid base asphalt pavement, is very important for the design and quality assurance of the interlayer bonding layer of the upper and lower heterostructure similar to the semi-rigid base asphalt pavement, and has guiding significance for the site construction; the fibers are uniformly distributed in a disorderly direction, and the fibers can form a three-dimensional multidirectional space network in the asphalt by the absorption of the fibers on the asphalt and the surface texture of the fibers, so that a bridging effect is achieved, and the asphalt is more tightly combined together; the fibers and the asphalt are fully contacted through the three-dimensional network reinforcing effect to form a space grid, so that the asphalt is protected to have better stability at high temperature, the anti-cracking capacity of a bonding layer is improved, the aggregate-asphalt interface is prevented from slipping, and the stress concentration phenomenon is reduced. The optimization method can better optimize the application of the interlayer material, and the optimal interlayer combination form is optimized, so that the interlayer bonding is more reliable, and the excessive use or insufficient use amount of the interlayer material is avoided.
Drawings
FIG. 1 is a schematic view of an enhanced interlayer bonding assembly of a base-surface layer in example 1 of the present invention;
FIG. 2 is a flow chart of an enhanced base-surface interlayer bonding assembly in accordance with example 1 of the present invention;
FIG. 3 is a schematic cross-sectional view of an ALD structure of average minimum dimension of crushed stone in example 1 of the present invention;
FIG. 4 is a radar chart showing the results of the shear test in example 1 of the present invention;
FIG. 5 is a radar chart showing the results of the pull-out test in example 1 of the present invention;
wherein, 1, sealing layer; 2. a transparent layer; 3. a crushed stone layer; 4. a first asphalt layer; 5. a fibrous layer; 6. and a second asphalt layer.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be purely exemplary of the invention and are not intended to be limiting.
Example 1
This embodiment 1 provides an enhanced base-surface interlayer bonding composite structure, which includes a seal layer and a permeable layer, wherein the seal layer is sequentially provided with a rubble layer, an asphalt layer i, a fiber layer and an asphalt layer ii from top to bottom; the interlayer bonding combined structure is suitable for interlayer bonding of an upper heterogeneous road surface structure and a lower heterogeneous road surface structure.
Wherein, the upper and lower heterogeneous road surface structure refers to the interlayer of a semi-rigid base asphalt road surface base layer, wherein the base layer is cement stabilized macadam, and the surface layer is rubber modified asphalt concrete ARHM-25.
The crushed stone layer is made of crushed stone materials with single grain size of 5-10mm, the coverage rate is 80%, and the FI value is 15%.
Furthermore, the permeable layer is made of PC-2 type cation emulsified asphalt permeable oil, and the permeable layer is ensured to permeate to the position 5mm below the base layer when being sprayed, so that the base layer and the upper structure are fully bonded, and the thickness of the permeable layer is 2 cm.
The asphalt layer I and the asphalt layer II are both made of rubber modified asphalt.
The thickness of the first asphalt layer is 0.8cm, and the thickness of the second asphalt layer is 0.8 cm.
The fiber layer is made of glass fiber, has a length of 6cm and a spreading amount of 100kg/m2The thickness is 1 cm.
The design flow chart of the preferred method for the reinforced base-surface layer interlayer bonding combined structure is shown in fig. 2, and the method specifically comprises the following steps:
in the formula (d)50＝8.35mm，FI＝15％；
R＝ALD×0.2×0.7×k＝7.32×0.2×0.7×0.8×100％≈82％
in the formula, k is 80%;
(1) a combination scheme of an interlayer bonding combination structure is formulated, wherein the spreading amount of fibers and gravels is fixed, the influence on the performance of the interlayer bonding layer is mainly the consumption of asphalt in a permeable layer and a sealing layer and the influence of external temperature, and the spreading rate of the bonding material is considered to be 82% so as to ensure that the oil spilling phenomenon does not occur. The following combinations were made for the constraints and are shown in Table 1. Taking three typical temperatures of high temperature, normal temperature and low temperature, wherein the corresponding temperature values are-10 ℃, 25 ℃ and 50 ℃, and performing strength tests under the three temperature conditions respectively;
TABLE 1 interlaminar Material combination types
Note: in table 1 combinations 1, 4, 7 and combinations 2, 5, 8 and combinations 3, 6, 9 are control groups of each other, combinations 1, 4, 7 being test groups of a single interlayer material, the remaining groups being reinforced interlayer combinations of two interlayer materials.
(2) The composite test piece containing the interlayer bonding combined structure is manufactured, a cement-stabilized macadam base layer is manufactured firstly during forming, PC-2 type cation emulsified asphalt permeable layer oil is firstly sprayed on the surface of the base layer after the base layer is well maintained, and a fiber reinforced rubber modified asphalt macadam seal layer is sprayed after demulsification. And (3) after finishing interlayer disposal, forming an asphalt mixture surface layer ARHM-25, pouring the stirred asphalt mixture on the formed and processed interlayer base layer, and rolling and compacting. Finally, a core drilling machine with the diameter of 100mm is adopted to drill and sample the composite test piece in the whole die, and a cylindrical test piece used for the test is obtained;
(3) respectively carrying out a shearing test and a drawing test under different temperature conditions, wherein the temperature range is-10-50 ℃, the shearing rate is 50mm/min, and the drawing rate is 10 mm/min. By drawing intensity stress value radar graphs corresponding to different combinations, see fig. 4 and 5, wherein the shear strength and the drawing strength of the combination 6 are optimal, so that the optimal interlayer bonding combination structure is determined to be the combination 6; wherein, the radar chart of the figure 4 and the radar chart of the figure 5 correspond to the test results at minus 10 ℃, 25 ℃ and 50 ℃ from outside to inside in sequence;
and (5): according to the scheme of the combination 6, firstly, roughening treatment is carried out between the surface layer and the base layer, then penetrating layer oil is sprayed, then sealing layers are constructed step by step according to the sequence of asphalt, fiber, asphalt and gravel, and finally surface layer laying is carried out; wherein the base layer is cement stabilized macadam, and the surface layer is rubber modified asphalt concrete ARHM-25.
Example 2
This example 2 provides a reinforced base-top interlayer bonding combination structure and its preferred method, which is different from the example 1 only in that: the base layer in the upper heterogeneous pavement structure and the lower heterogeneous pavement structure is cement stabilized macadam, the surface layer is an ATB-25 flexible surface layer, and the rest steps and parameters are the same.
Example 3
This example 3 provides a reinforced base-top interlayer bonding combination structure and its preferred method, which is different from the example 1 only in that: the base layer in the upper heterogeneous pavement structure and the lower heterogeneous pavement structure is made of cement concrete, the surface layer is an ARHM-25 flexible surface layer, and other steps and parameters are the same.
Example 4
This example 4 provides a reinforced base-top interlayer bonding combination structure and its preferred method, which is different from the one in example 1 only in that: the permeable layer is made of anionic emulsified asphalt permeable oil, and the asphalt layer I and the asphalt layer II are both made of PCR modified emulsified asphalt.
The foregoing is merely exemplary and illustrative of the present invention and it is within the purview of one skilled in the art to modify or supplement the embodiments described or to substitute similar ones without the exercise of inventive faculty, and still fall within the scope of the claims.
Claims (10)
1. The utility model provides an increase mode base-surface course interlayer bonding integrated configuration which characterized in that, includes seal coat and permeable stratum, and the seal coat is from last to having set gradually metalling, pitch layer one, fibrous layer and pitch layer two down.
2. The reinforced base-face interlayer bonding assembly of claim 1, wherein the reinforced base-face interlayer bonding assembly is adapted for interlayer bonding of upper and lower heterogeneous pavement structures; wherein, the upper and lower heterogeneous road surface structure is between surface course and basic unit.
3. The interlayer bonding combined structure of the reinforced base-surface layer as claimed in claim 1 or 2, wherein the gravel layer is a single-particle-size gravel material with the particle size of 5-10mm, the coverage rate is 70-85%, and the FI value is 10-20%; the permeable layer is made of emulsified asphalt permeable layer oil, including but not limited to cation emulsified asphalt, anion emulsified asphalt or coal asphalt, and the thickness of the permeable layer oil is 1-3 cm.
4. The reinforced base-surface interlayer bonding combined structure as claimed in claim 1 or 2, wherein the first asphalt layer and the second asphalt layer are both made of rubber modified asphalt or PCR modified emulsified asphalt, the thickness of the first asphalt layer is 0.8-1.2 cm, and the thickness of the second asphalt layer is 0.8-1.2 cm.
5. The reinforced interlayer bonding composite structure of claim 1 or 2, wherein the fiber layer is made of glass fiber, has a length of 6-10 cm and a spreading amount of 100-200 kg/m2The thickness of the film is 1-2 cm.
6. A preferred method of bonding a composite structure between reinforced base-facing layers according to any of claims 1 to 5, comprising in particular the steps of:
step (1): calculating the average minimum size ALD of the scattered aggregates;
step (2): calculating the spreading rate R of the binding material;
and (3): determining a fiber distribution mode;
and (4): determining a combination scheme of the interlayer bonding combination structure through a shear test and a drawing test;
and (5): according to the combination scheme of the interlayer bonding combination structure determined in the step (4), roughening treatment is carried out between the surface layer and the base layer, then penetrating oil is sprayed, then sealing layers are constructed step by step according to the sequence of asphalt, fiber, asphalt and gravel, and finally surface layer laying is carried out.
7. The preferred method of reinforced base-facing interlayer bonding assembly structure of claim 6, wherein said step (1) of calculating the average minimum dimension ALD of the distributed aggregate is formulated as follows:
wherein ALD-average minimum size of aggregate, mm;
d50-mesh size, mm, corresponding to 50% passage;
FI-needle flake coefficient (mass percentage of needle-flake particles to total mass of aggregate)%.
8. The preferred method for bonding a composite structure between layers of a reinforced base-facing layer as recited in claim 6, wherein said step (2) calculates the spreading rate R of the binder according to the following formula:
R＝ALD×0.2×0.7×k
wherein, the distribution rate of the R-binding material is L/m2(ii) a ALD-average minimum size of aggregate, mm; k-rubble coverage.
9. The method for optimizing the bonding combination structure between the reinforced base-surface layer as recited in claim 6, wherein the distribution of the fibers determined in the step (3) is random and uniform.
10. The preferred method for forming a reinforced base-facing interlayer bonding composite structure as claimed in claim 6, wherein said step (4) of determining the combination scheme of the interlayer bonding composite structure through the shear test and the drawing test comprises the following specific processes: formulating a combination scheme of the interlayer bonding combination structure, manufacturing a composite test piece containing the interlayer bonding structure, respectively carrying out a shear test and a drawing test under different temperature conditions, then drawing intensity stress value radar charts corresponding to different combinations, and determining the optimal interlayer bonding combination structure; wherein the temperature range is-10 ℃ to 50 ℃, the shearing rate in the shearing test is 50mm/min to 65mm/min, and the drawing rate in the drawing test is 10mm/min to 20 mm/min.
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