CN111851192A - Ultrahigh-ductility concrete stress absorbing layer asphalt pavement - Google Patents
Ultrahigh-ductility concrete stress absorbing layer asphalt pavement Download PDFInfo
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- CN111851192A CN111851192A CN202010593402.2A CN202010593402A CN111851192A CN 111851192 A CN111851192 A CN 111851192A CN 202010593402 A CN202010593402 A CN 202010593402A CN 111851192 A CN111851192 A CN 111851192A
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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
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Abstract
The invention relates to an ultra-high ductility concrete stress absorbing layer asphalt pavement, which comprises a cushion layer, a subbase layer, a base layer, a stress absorbing layer and a surface layer which are sequentially paved from bottom to top; the cushion layer is a difficult frost heaving granule; the subbase layer is lime-fly ash stabilized macadam; the base layer is made of cement stabilized macadam; the stress absorption layer is made of ultra-high ductility concrete; the surface layer is made of dense asphalt concrete. Compared with the prior art, the invention utilizes the high toughness and high energy consumption capability of the ultra-high ductility concrete as the stress absorption layer to be arranged between the base layer and the surface layer of the asphalt pavement, can effectively control the generation and development of reflection cracks, improve the fatigue resistance of the pavement, reduce water damage, improve the mechanical property and the service life of the pavement and reduce the maintenance frequency of the pavement.
Description
Technical Field
The invention belongs to the field of traffic and transportation engineering, and particularly relates to an ultra-high ductility concrete stress absorbing layer asphalt pavement.
Background
In order to meet economic development and demand, high-grade highways have begun to adopt a large number of structural forms of semi-rigid base asphalt pavements. Compared with the traditional asphalt pavement with a mud-bonded gravel base layer and a graded gravel base layer, the semi-rigid asphalt pavement with the inorganic binder has the advantages of good water stability, high strength and bearing capacity, high rigidity and the like. With the widespread use of semi-rigid base asphalt pavement, the problem of cracking of such pavement is becoming more serious.
Through related researches, the causes of the cracks of the semi-rigid asphalt pavement can be roughly divided into three types, namely fatigue cracks, temperature cracks and reflection cracks, wherein the proportion of the cracks of the pavement caused by the reflection cracks is often more than 50 percent, and the cracks become the main causes of the cracks of the pavement. The reflection cracks refer to cracks which are easily generated in a semi-rigid base material under the condition of temperature and humidity change, generate stress concentration at an upper end asphalt surface layer and are generated on the asphalt surface layer from bottom to top under the action of vehicle load and rainwater infiltration. How to solve the reflection cracks of the semi-rigid asphalt pavement is a problem to be solved urgently in road management and maintenance.
Disclosure of Invention
The invention aims to solve the problems of pavement cracking and water seepage caused by reflection cracks of a semi-rigid asphalt pavement, and provides an asphalt pavement with an ultra-high-ductility concrete stress absorbing layer.
The purpose of the invention is realized by the following technical scheme:
an ultra-high ductility concrete stress absorbing layer asphalt pavement comprises a cushion layer, a subbase layer, a base layer, a stress absorbing layer and a surface layer which are sequentially paved from bottom to top;
the cushion layer is a difficult frost heaving granule;
The subbase layer is lime-fly ash stabilized macadam;
the base layer is made of cement stabilized macadam;
the stress absorption layer is made of ultra-high ductility concrete;
the surface layer is made of dense asphalt concrete.
The invention utilizes the high toughness of the ultra-high ductility concrete as a stress absorption layer arranged between the base layer and the surface layer of the asphalt pavement, can effectively control the generation and development of reflection cracks, improve the fatigue resistance of the pavement, reduce water damage, improve the mechanical property and the service life of the pavement and reduce the maintenance frequency of the pavement.
Preferably, the non-frost-heaving aggregate is gravel soil with the fine material content of 6-10 wt%.
Preferably, the thickness of the cushion layer is 15-25cm, and the cushion layer is paved to the same width with the roadbed so as to facilitate the drainage of the pavement structure and keep the roadbed stable.
Preferably, the lime-fly ash stabilized macadam contains 6-10 wt% of lime, 10-15 wt% of fly ash and 0.6-1 MPa of 7d strength. Preferably, the base substrate layer has a thickness of 15-25 cm.
Preferably, the cement content in the cement-stabilized macadam is 3-6 wt%, and the 7d strength is 2-6 MPa. Preferably, the thickness of the base layer is 20-30 cm.
Preferably, the thickness of the stress absorption layer is 2 cm-5 cm, cracks can be effectively dispersed, the construction cost can be controlled, the tensile strength of the ultra-high ductility concrete is more than 3MPa, the axial tensile elongation is not less than 3%, and the compressive strength is between 10MPa and 60 MPa.
Preferably, the thickness of the surface layer is 10-20cm, the type of the densely-mixed asphalt concrete is AC-13, the mass ratio of asphalt in the densely-mixed asphalt concrete to mineral aggregate is 5.6%, the mass content of mineral powder is 4.5%, and the porosity is 5%; the mass ratio of 1-1.5 cm of broken stone, 0.5-1 cm of broken stone, 0.3-0.8 cm of broken stone and stone chippings is respectively as follows: 22%, 23%, 13% and 42%.
The principle of the invention is that as shown in fig. 2, the reflective cracks develop upwards from the cushion layer, the width of the reflective cracks is still large through the underlayer and the semi-rigid base layer, and the reflective cracks can cause the asphalt mixture surface layer to be torn. The elongation of tensile deformation of the surface layer of the commonly used asphalt mixture in pavement engineering is about 0.1-0.2%, which is also the reason that the service life of the asphalt pavement is short and the repeated maintenance is needed. As shown in figure 3, the ultra-high ductility concrete stress absorbing layer with a certain thickness is added between the asphalt mixture surface layer and the semi-rigid base layer, and the ultra-high ductility concrete stress absorbing layer disperses the cracks with large width into tiny cracks with the width less than 0.2mm, so that the cracks can not crack on the asphalt mixture surface layer, and the phenomena of pavement cracking and water seepage caused by reflection cracks are solved.
Drawings
FIG. 1 is a schematic structural diagram of an asphalt pavement structure of an ultra-high ductility concrete stress absorbing layer;
in the figure: 1-cushion layer; 2-underlayment; 3-a base layer; 4-a stress absorbing layer; 5-surface layer;
FIG. 2 is a schematic illustration of a common asphalt pavement crack;
FIG. 3 is a schematic view of a stress absorbing layer of ultra-high ductility concrete dispersing cracks in an asphalt pavement;
FIG. 4 is a schematic diagram of a stress absorbing layer of ultra-high ductility concrete dispersing cracks in an asphalt pavement;
FIG. 5 is a graph of the effect of different ultra-high ductility concrete stress absorbing layers on the strain of an asphalt pavement.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
An ultra-high ductility concrete stress absorbing layer asphalt pavement is shown in figure 1 and comprises a cushion layer 1, a subbase layer 2, a base layer 3, a stress absorbing layer 4 and a surface layer 5 which are sequentially paved from bottom to top; the cushion layer 1 is a granular material which is not easy to frost heaving; the subbase layer 2 is lime-fly ash stabilized macadam; the base layer 3 is cement stabilized macadam; the stress absorbing layer 4 is ultra-high ductility concrete; the surface layer 5 is densely matched asphalt concrete.
Wherein, the thickness of the cushion layer 1 is 20cm, and the used difficult frost heaving aggregate is gravel soil with the fine material content of 6 percent; the cushion layer 1 should be laid to the same width of the roadbed to facilitate the drainage of the pavement structure and keep the roadbed stable.
The thickness of the subbase layer 2 is 20cm, the content of lime in the used lime-fly ash stabilized macadam is 6%, the content of fly ash is 10%, and the 7d strength is about 0.6-1 MPa.
The thickness of the base layer 3 is 25cm, the content of cement in the used cement stabilized macadam is 3%, and the 7d strength is about 2-6 MPa.
The thickness of the stress absorption layer 4 is 2cm, and the ultra-high ductility concrete is prepared from the following raw materials in parts by weight: 700 parts of portland cement, 600 parts of fly ash, 500 parts of river sand, 350 parts of water, 1.0 part of a thickening agent and 3 parts of a water reducing agent. 20 parts of ultra-high molecular weight polyethylene fiber, the fiber strength is 2.9GPa, the elastic modulus is 116GPa, the elongation at break is 2.42 percent, and the density is 0.97g/m3。
The thickness of the surface layer 5 is 15cm, the type of the used densely-matched asphalt concrete is AC-13, the asphalt-to-stone ratio of the asphalt concrete is 5.6%, the content of mineral powder is 4.5%, and the porosity is 5%; the proportion of 1-1.5 cm broken stone, 0.5-1 cm broken stone, 0.3-0.8 cm broken stone and stone chippings is respectively as follows: 22%, 23%, 13% and 42%.
Through tests, under the loading condition that reflection cracks are caused by the fact that the simulated temperature of an indirect tensile test is reduced, compared with an asphalt pavement structure without a stress absorbing layer, the plastic strain at the bottom of the asphalt layer of the pavement structure added with the ultra-high-ductility concrete stress absorbing layer is reduced by about 60%, large cracks are dispersed into small cracks with the width less than 0.2mm, the cracks of the degree can not crack in an asphalt mixture surface layer, and the cracks of a semi-rigid base layer are effectively prevented from developing upwards. Has good effect of preventing and treating reflection cracks and reduces the phenomena of pavement cracking and water seepage, and the specific principle is shown in figures 3 and 4.
Example 2
An ultra-high ductility concrete stress absorbing layer asphalt pavement is shown in figure 1 and comprises a cushion layer 1, a subbase layer 2, a base layer 3, a stress absorbing layer 4 and a surface layer 5 which are sequentially paved from bottom to top; the cushion layer 1 is a granular material which is not easy to frost heaving; the subbase layer 2 is lime-fly ash stabilized macadam; the base layer 3 is cement stabilized macadam; the stress absorbing layer 4 is ultra-high ductility concrete; the surface layer 5 is densely matched asphalt concrete.
Wherein, the thickness of the cushion layer 1 is 20cm, and the used difficult frost heaving aggregate is gravel soil with the fine material content of 6 percent; the cushion layer 1 should be laid to the same width of the roadbed to facilitate the drainage of the pavement structure and keep the roadbed stable.
The thickness of the subbase layer 2 is 20cm, the content of lime in the used lime-fly ash stabilized macadam is 6%, the content of fly ash is 10%, and the 7d strength is about 0.6-1 MPa.
The thickness of the base layer 3 is 25cm, the content of cement in the used cement stabilized macadam is 3%, and the 7d strength is about 2-6 MPa.
The thickness of the stress absorption layer 4 is 3cm, and the ultra-high ductility concrete is prepared from the following raw materials in parts by weight: 700 parts of portland cement, 600 parts of fly ash, 500 parts of river sand, 350 parts of water, 1.0 part of a thickening agent and 3 parts of a water reducing agent. 20 parts of ultra-high molecular weight polyethylene fiber, the fiber strength is 2.9GPa, the elastic modulus is 116GPa, the elongation at break is 2.42 percent, and the density is 0.97g/m 3。
The thickness of the surface layer 5 is 15cm, the type of the used densely-matched asphalt concrete is AC-13, the asphalt-to-stone ratio of the asphalt concrete is 5.6%, the content of mineral powder is 4.5%, and the porosity is 5%; the proportion of 1-1.5 cm broken stone, 0.5-1 cm broken stone, 0.3-0.8 cm broken stone and stone chippings is respectively as follows: 22%, 23%, 13% and 42%.
Through tests, under the loading condition that reflection cracks are caused by the fact that the simulated temperature of an indirect tensile test is reduced, compared with an asphalt pavement structure without a stress absorbing layer, the plastic strain at the bottom of the asphalt layer of the pavement structure added with the ultra-high-ductility concrete stress absorbing layer is reduced by about 67%, large cracks are dispersed into small cracks with the width less than 0.2mm, the cracks of the degree can not crack in an asphalt mixture surface layer, and the cracks of a semi-rigid base layer are effectively prevented from developing upwards. Has good effect of preventing and treating reflection cracks and reduces the phenomena of pavement cracking and water seepage, and the specific principle is shown in figures 3 and 4.
Example 3
An ultra-high ductility concrete stress absorbing layer asphalt pavement is shown in figure 1 and comprises a cushion layer 1, a subbase layer 2, a base layer 3, a stress absorbing layer 4 and a surface layer 5 which are sequentially paved from bottom to top; the cushion layer 1 is a granular material which is not easy to frost heaving; the subbase layer 2 is lime-fly ash stabilized macadam; the base layer 3 is cement stabilized macadam; the stress absorbing layer 4 is ultra-high ductility concrete; the surface layer 5 is densely matched asphalt concrete.
Wherein, the thickness of the cushion layer 1 is 20cm, and the used difficult frost heaving aggregate is gravel soil with the fine material content of 6 percent; the cushion layer 1 should be laid to the same width of the roadbed to facilitate the drainage of the pavement structure and keep the roadbed stable.
The thickness of the subbase layer 2 is 20cm, the content of lime in the used lime-fly ash stabilized macadam is 6%, the content of fly ash is 10%, and the 7d strength is about 0.6-1 MPa.
The thickness of the base layer 3 is 25cm, the content of cement in the used cement stabilized macadam is 3%, and the 7d strength is about 2-6 MPa.
The thickness of the stress absorption layer 4 is 4cm, and the ultra-high ductility concrete is prepared from the following raw materials in parts by weight: 700 parts of Portland cement, 600 parts of fly ash and 500 parts of river sand350 parts of water, 1.0 part of thickening agent and 3 parts of water reducing agent. 20 parts of ultra-high molecular weight polyethylene fiber, the fiber strength is 2.9GPa, the elastic modulus is 116GPa, the elongation at break is 2.42 percent, and the density is 0.97g/m3。
The thickness of the surface layer 5 is 15cm, the type of the used densely-matched asphalt concrete is AC-13, the asphalt-to-stone ratio of the asphalt concrete is 5.6%, the content of mineral powder is 4.5%, and the porosity is 5%; the proportion of 1-1.5 cm broken stone, 0.5-1 cm broken stone, 0.3-0.8 cm broken stone and stone chippings is respectively as follows: 22%, 23%, 13% and 42%.
To sum up, compared with the asphalt pavement structure without the stress absorbing layer under the loading condition that the indirect tensile test simulates the reflection cracks caused by the temperature reduction, the plastic strain at the bottom of the asphalt layer of the pavement structure added with the ultra-high-ductility concrete stress absorbing layer is reduced by about 68 percent through testing, as shown in fig. 5, large cracks are dispersed into small cracks with the width less than 0.2mm, the cracks of the degree can not cause the cracks on the asphalt mixture surface layer, and the upward development of the semi-rigid base layer cracks is effectively prevented. The reflective crack prevention and treatment effect is good, and the phenomena of pavement cracking and water seepage are reduced.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (9)
1. An ultra-high ductility concrete stress absorbing layer asphalt pavement is characterized by comprising a cushion layer, a subbase layer, a base layer, a stress absorbing layer and a surface layer which are sequentially paved from bottom to top;
The cushion layer is a difficult frost heaving granule;
the subbase layer is lime-fly ash stabilized macadam;
the base layer is made of cement stabilized macadam;
the stress absorption layer is made of ultra-high ductility concrete;
the surface layer is made of dense asphalt concrete.
2. The ultra-high ductility concrete stress absorbing layer asphalt pavement according to claim 1, wherein the non-frost-heaving aggregate is a gravel-like soil with a fine content of 6-10 wt%.
3. The ultra-high ductility concrete stress absorbing layer asphalt pavement as claimed in claim 2, wherein the thickness of the mat layer is 15-25cm, and the mat layer is laid to the same width as the roadbed.
4. The asphalt pavement with the ultra-high ductility concrete stress absorbing layer as claimed in claim 1, wherein the lime-fly ash stabilized macadam contains 6-10 wt% of lime, 10-15 wt% of fly ash and 0.6-1 MPa of 7d strength.
5. The ultra-high ductility concrete stress absorbing asphalt pavement as claimed in claim 4, wherein the thickness of the subbase layer is 15-25 cm.
6. The asphalt pavement with the ultra-high ductility concrete stress absorbing layer as claimed in claim 1, wherein the cement content of the cement stabilized macadam is 3-6 wt%, and the 7d strength is 2-6 MPa.
7. The ultra-high ductility concrete stress absorbing layer asphalt pavement as claimed in claim 6, wherein the thickness of the base layer is 20-30 cm.
8. The asphalt pavement with the ultra-high ductility concrete stress absorbing layer as claimed in claim 1, wherein the thickness of the stress absorbing layer is 2 cm-5 cm, the tensile strength of the ultra-high ductility concrete is greater than 3MPa, the axial tensile elongation is not less than 3%, and the compressive strength is 10 MPa-60 MPa.
9. The asphalt pavement with the ultra-high ductility concrete stress absorbing layer as claimed in claim 1, wherein the thickness of the surface layer is 10-20cm, the mass ratio of asphalt to mineral aggregate in the densely-distributed asphalt concrete is 5.6%, the mass content of mineral powder is 4.5%, and the porosity is 5%; the mass ratio of 1-1.5 cm of broken stone, 0.5-1 cm of broken stone, 0.3-0.8 cm of broken stone and stone chippings is respectively as follows: 22%, 23%, 13% and 42%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112501977A (en) * | 2020-11-20 | 2021-03-16 | 重庆交通大学 | Composite bionic anti-cracking layer for road and construction method thereof |
| CN114772998A (en) * | 2022-04-11 | 2022-07-22 | 华南农业大学 | Rigid stress absorbing layer for composite pavement anti-reflection cracks and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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