CN111021178B - Cement-stabilized anti-crack base newly-built pavement structure and construction method and application thereof - Google Patents
Cement-stabilized anti-crack base newly-built pavement structure and construction method and application thereof Download PDFInfo
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Abstract
The invention discloses a cement stabilized anti-crack base newly-built pavement structure and a construction method and application thereof; the pavement structure sequentially comprises an asphalt concrete upper surface layer, an asphalt concrete lower surface layer, a cement stable anti-cracking base layer and a cement stable subbase layer from top to bottom; the cement stabilized anti-cracking base layer is made of an anti-cracking cement stabilized macadam mixture, the main components of the cement stabilized anti-cracking base layer are cement, large-particle macadam and small-size aggregate, the cement stabilized anti-cracking base layer adopts a construction mode of on-site layer laying and back mixing, and the large-particle macadam is guaranteed to be in complete contact with each other to form a main framework, and the small-size aggregate is evenly filled in gaps among the frameworks. The cement stabilized anti-crack base layer newly-built pavement structure reduces the reflection cracks of the semi-rigid base layer asphalt pavement structure, solves the problem that the traditional semi-rigid base layer pavement structure causes various diseases due to the expansion penetration of the reflection cracks, reduces various diseases of the pavement structure due to the expansion penetration of the reflection cracks, and achieves the purpose of prolonging the service life of the pavement structure.
Description
Technical Field
The invention belongs to the field of traffic engineering, and particularly relates to a cement-stabilized anti-crack base newly-built pavement structure for national and provincial trunk roads, municipal roads and expressways.
Background
The semi-rigid base asphalt pavement is the main pavement structure form of the highway of the main line of China province. The semi-rigid base asphalt pavement can be widely applied in China due to the technical advantages of high comprehensive strength, low manufacturing cost and the like, and makes contribution to the development of the highway industry of China.
However, the semi-rigid base layer represented by the water-stable macadam and the lime macadam has inherent characteristics of high modulus, far greater compression resistance than tensile resistance and the like, and the problems of drying shrinkage and temperature shrinkage cracking are difficult to control effectively, so that the semi-rigid base layer asphalt pavement always generates different degrees of reflection crack diseases in the using process. For typical asphalt pavement structures, the asphalt overlay base is often in compression, while the semi-rigid base layer is the major component subject to tensile stress and fatigue. However, the semi-rigid material represented by cement stabilized macadam has a mechanical characteristic that the tensile strength is much smaller than the compressive strength. Under the repeated influence of load and weather conditions, the semi-rigid material is easy to generate tensile stress fatigue effect to crack a base layer, then the bottom of an asphalt surface layer is cracked due to stress concentration, the cracks gradually expand and extend along with the lapse of time, and the pavement is transversely cracked and even is meshed. Thus, the ability of a semi-rigid substrate to function for extended periods of time requires that it be free of extensive, severe cracking.
A series of researches are made on the large-particle-size asphalt mixture at home and abroad. When the large-particle-size asphalt mixture is used as a base layer, the special advantages are as follows: the embedding and extruding effect is outstanding, the strength attenuation rate is slow, no crack is generated, and the shrinkage stress and the shearing resistance of the material can be effectively absorbed. By referring to past experience of using large-particle-size asphalt macadam as a base material, the method takes the problem of early cracking of a semi-rigid base asphalt pavement as a starting point, simultaneously considers the economic requirement, namely no asphalt binder is needed to be added, and provides a cement-stabilized anti-cracking base newly-built pavement structure, wherein the cement-stabilized anti-cracking base material is an anti-cracking cement-stabilized macadam mixture, and the main components in the material are cement, large-particle macadam and small-size aggregate. Large-particle crushed stones are generally mixtures of crushed stones with a maximum nominal particle size of the mineral aggregate of more than 25 mm.
The large-grained macadam is applied to a cement stabilized anti-crack base course at present and has certain application on an old road reconstructed or overhauled, but the application on a newly-built road surface is relatively less, and the application of the cement stabilized anti-crack base course containing the large-grained macadam to a newly-built road surface structure is not reported.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides a cement-stabilized anti-crack base newly-built pavement structure, which reduces the reflection cracks of a semi-rigid base asphalt pavement structure, solves the problem of various diseases caused by the expansion penetration of the reflection cracks of the traditional semi-rigid base pavement structure, and reduces various diseases caused by the expansion penetration of the reflection cracks of the pavement structure, thereby achieving the purpose of prolonging the service life of the pavement structure.
The invention also provides a construction method and application of the cement stabilized anti-crack base newly-built pavement structure. The cement stable anti-cracking base layer adopts a construction mode of on-site layer paving and back mixing, ensures that large-particle broken stones are completely contacted to form a main framework, and small-size aggregates uniformly fill gaps among the frameworks.
The technical scheme is as follows: in order to achieve the above object, the invention provides a cement stabilized anti-crack base layer newly-built pavement structure, which comprises an asphalt concrete upper surface layer, an asphalt concrete lower surface layer, a cement stabilized anti-crack base layer and a cement stabilized subbase layer from top to bottom in sequence; the cement stable anti-cracking base material is an anti-cracking cement stable macadam mixture, and the main components of the cement stable anti-cracking base material are cement, large-particle macadam and small-size aggregate.
The cement stable anti-cracking base layer material is arranged above the cement stable subbase layer and is an anti-cracking cement stable macadam mixture, and the thickness of the anti-cracking cement stable macadam mixture is 15-20 cm.
As a further improvement of the invention, the cement stabilized anti-cracking base layer adopts an anti-cracking cement stabilized macadam mixture with plate blocking effect, deformation absorption effect and stress relaxation effect, and the main components in the material are cement, large-grained macadam and small-size aggregate.
Wherein, the cement in the cement stable anti-cracking base material is PC 32.5, and the dosage is 3.0-6.0% (namely the ratio of the cement quality to the whole cement stable anti-cracking base material quality); the large-particle broken stone gradation is as follows: the large-particle crushed stone screening device comprises a 75 mm-sized square-hole screen, a 63 mm-sized square-hole screen and a 53 mm-sized square-hole screen, wherein the large-particle crushed stone passing rate is 100%, the large-particle crushed stone passing rate is 90.5%, the large-particle crushed stone passing rate is 82.5%, the large-particle crushed stone passing rate is 31.5mm, and the large-particle crushed stone passing rate is 0%; the small-size aggregate mainly comprises melon seed pieces, rice seeds and stone powder.
Preferably, the largest particle of the melon seed slices is 9.5mm, the largest particle of the rice and the stone powder is 4.75mm, and the mass component proportions of the melon seed slices, the rice and the stone powder are as follows: rice: the stone powder is 30:25: 45.
Further, the mass ratio of the large-particle crushed stones to the small-size aggregates is 56: 44.
The grading of the upper layer design of the asphalt concrete is AC-13 type grading, the thickness is 4-6cm, and the parameter requirements of the upper layer material refer to relevant specifications.
The grading of the asphalt concrete lower surface layer design is AC-25 type grading, the thickness is 6-8cm, and the upper surface layer material parameter requirements refer to relevant specifications.
Wherein the cement stable subbase layer is a common water stable subbase layer, the thickness is 15-20cm, and the upper layer material parameters are required to refer to relevant specifications.
The invention relates to a construction method of a new pavement structure of a cement stable anti-crack base course, which comprises the following steps:
(1) paving a cement stable subbase layer according to a conventional method;
(2) paving a cement stable anti-cracking base layer, wherein the cement stable anti-cracking base layer adopts a field layer paving and post-road mixing construction mode, paving large broken stones on the field at first, paving and filling small-size aggregates, using a paver to operate in the paving process, using a rotary cultivator to perform field road mixing after paving, ensuring that the large broken stones in the anti-cracking cement stable broken stone mixture are completely contacted and the small-size aggregates are uniformly filled in gaps inside the large broken stones, then using a loader and a manual mode to fill cement in open gaps on the surface of the paved road surface, ensuring that the gap filling amount is not too large, uniformly spreading the gap, and finally using a vibration road roller to perform rolling forming; after the cement stable anti-cracking base layer is paved, covering and maintaining the cement stable anti-cracking base layer by using geotextile, paving an upper layer pavement structure after maintaining for at least 7 days, and always ensuring the surface of the cement stable anti-cracking base layer to be wet before paving an upper layer;
(3) paving an asphalt concrete lower surface layer and an asphalt concrete upper surface layer.
Furthermore, as the local pits or bulges may occur during the construction, a spade or a pick is needed to level the pit or the bulge, and after the pressure is stabilized, the concave or convex part is observed by adopting a three-meter ruler, and the part is loosened for repair.
The invention relates to application of a cement stabilized anti-crack base newly-built pavement structure in a trunk highway.
Furthermore, the trunk road is a newly-built trunk road with a semi-rigid base layer.
All of the starting materials in the present invention are commercially available.
The design principle is as follows: the cement stabilized anti-cracking base material is an anti-cracking cement stabilized macadam mixture, large-grained macadams in the material are fully contacted to form a framework, gaps among the large-grained macadams filled with small-size aggregates and cement form cement concrete blocks in the gaps of the large-grained macadams, the framework formed by the large-grained macadams is supported and restrained, when the material is subjected to shrinkage deformation under the action of temperature or load, micro cracks can be generated on the large-grained macadams and the cement concrete blocks to absorb the deformation and release stress, and therefore reflection cracks are avoided to a certain extent. The anti-crack cement stabilized macadam material has the plate body blocking effect, the deformation absorption effect and the stress relaxation effect, and the application of the pavement structure reduces the reflection cracks of the semi-rigid base asphalt pavement and can ensure that the interior of the pavement structure is prevented from being damaged by water seepage under the pavement surface; meanwhile, compared with a large-particle asphalt mixture, the crack-resistant cement stabilized macadam material meets the economic requirement better. And because of the existence of the cement stable subbase layer, the strength of the pavement structure can be ensured. The pavement structure reduces the reflection cracks of the pavement structure and greatly prolongs the service life of the pavement on the premise of ensuring the smoothness, stability and wear resistance of the pavement.
Has the advantages that: compared with the prior art, the invention has the following advantages:
the invention relates to a pavement structure suitable for a traditional semi-rigid base asphalt pavement. The cement stabilized anti-cracking base material is an anti-cracking cement stabilized macadam mixture, the anti-cracking cement stabilized macadam material has a plate body blocking effect, a deformation absorption effect and a stress relaxation effect, large-grained macadams in the material are fully contacted to form a skeleton, and compared with a common cement stabilized macadam base, the bearing capacity of the large-grained macadam is more outstanding. And the space between the large granule rubble of small-size aggregate packing, its aim at forms the cement concrete piece with cement in the large granule rubble space together, and then supports and retrains the skeleton that is formed by the large granule rubble, when the material produced the contraction deformation under temperature or load effect, the large granule rubble can produce the microcrack with the cement concrete piece and absorb the deformation, release stress to the production of reflection crack has been avoided to a certain extent. The application of the pavement structure reduces the reflection cracks of the semi-rigid base asphalt pavement, and can ensure that the interior of the pavement structure is prevented from being damaged by water seepage under the pavement surface; meanwhile, compared with a large-particle asphalt mixture, the crack-resistant cement stabilized macadam material meets the economic requirement better. And because of the existence of the cement stable subbase layer, the strength of the pavement structure can be ensured. The pavement structure reduces the reflection cracks of the pavement structure and greatly prolongs the service life of the pavement on the premise of ensuring the smoothness, stability and wear resistance of the pavement.
According to the cement stabilized anti-crack base layer newly-built pavement structure provided by the invention, the anti-crack cement stabilized macadam material is used as the base layer material, the reflection cracks of the pavement structure are reduced, the pavement structure is prevented from being damaged by the reflection cracks, and the service life of the pavement structure is prolonged. The structure is particularly suitable for the semi-rigid base asphalt pavement in the areas with clear four seasons, large temperature difference and much rain.
The cement stabilized anti-crack base newly-built pavement structure has wide raw material sources and convenient paving and construction, and can be applied to the highway of the heavy traffic main line on a large scale.
Drawings
Fig. 1 shows a new pavement structure of a cement-stabilized anti-crack base layer applied to a highway of a trunk line.
Detailed Description
The invention will be further described with reference to specific embodiments and the accompanying drawings.
Example 1
A new pavement structure of a cement-stabilized anti-cracking base course is applied to a highway of a heavy traffic volume, the project is a new project, and a cross section design drawing of the pavement structure of a new project is shown in figure 1.
The pavement structure sequentially comprises an asphalt concrete upper surface layer, an asphalt concrete lower surface layer, a cement stable anti-cracking base layer and a cement stable subbase layer paved on a roadbed from top to bottom;
the cement stabilized anti-cracking base layer is arranged above the cement stabilized subbase layer, the cement stabilized large-grained macadam base layer material is an anti-cracking cement stabilized macadam mixture, and the thickness of the layer is set to be 20cm in order to meet the requirement of traffic volume. The main components of the anti-crack cement stabilized macadam mixture are cement, large-particle macadam and small-size, and the anti-crack cement stabilized macadam mixture plays roles in blocking a plate body, absorbing deformation, relaxing stress and the like.
Wherein, the cement is PC 32.5, and the dosage is 3.0%;
the large-particle broken stone gradation is as follows: the large-particle crushed stone passing rate of the square-hole sieve is 90.5%, the size of the square-hole sieve is 53mm, the large-particle crushed stone passing rate of the square-hole sieve is 82.5%, the size of the square-hole sieve is 31.5mm, and the large-particle crushed stone passing rate of the square-hole sieve is 0%.
The small-size aggregate mainly comprises melon seed pieces, rice seeds and stone powder. The largest particle of the melon seed slices is 9.5mm, the largest particle of the rice and the stone powder is 4.75mm, and the mass composition ratio of the melon seed slices to the rice and stone powder is as follows: rice: the stone powder is 30:25: 45. The mass ratio of the large-particle crushed stone to the small-size aggregate is 56: 44.
The construction method of the new pavement structure of the cement stable anti-cracking base course comprises the following steps:
paving a cement stable subbase layer according to the detail rule of highway pavement base course construction technology (JTG/T F20-2015); paving a cement stable anti-cracking base course, wherein the cement stable anti-cracking base course adopts a construction mode of on-site layer paving and post-road-mixing, large-grained gravel is paved on site firstly, then small-sized aggregate is paved and filled, a paver is used for operation in the paving process, a rotary cultivator is used for on-site road-mixing after paving is completed, the large-grained gravel in the anti-cracking cement stable gravel mixture is ensured to be in complete contact and the small-sized aggregate is uniformly filled in the gap inside the large-grained gravel, then a loader and a manual mode are used for filling cement in the open gap on the surface of the paved road surface, the filling amount of the gap is not too much, the gap is kept to be uniformly dispersed, and finally, a vibratory roller is used for rolling and forming. After the cement stable anti-cracking base layer is paved, covering and maintaining the cement stable anti-cracking base layer by using geotextile, paving an upper layer pavement structure after maintaining for at least 7 days, and always ensuring the surface of the cement stable anti-cracking base layer to be wet before paving an upper layer; the lower asphalt concrete surface and the upper asphalt concrete surface are paved according to technical Specification for asphalt road pavement construction for highways (JTG F40-2004).
Because the phenomenon of local pit concavity or convexity can occur during construction, a spade and a pickaxe are required to level the steel pipe, after pressure stabilization, a three-meter ruler is adopted to observe, the concave or convex part is still remained, and the part is loosened to carry out repair work.
The grading of the design of the upper layer of the asphalt concrete is AC-13 type grading, the thickness is 4cm, and the parameters of the upper layer material are required to refer to the design Specification of road asphalt pavement (JTG D50-2017).
The grading of the design of the lower asphalt concrete layer is AC-25 type grading, the thickness is 6cm, and the parameters of the lower layer material are required to refer to the design Specification of road asphalt pavement (JTG D50-2017).
The cement-stabilized subbase layer is a cement-stabilized macadam subbase layer, the thickness of the subbase layer is 20cm, and the parameter requirements and the strength requirements of the base layer material refer to the design Specification of road asphalt pavements (JTG D50-2017).
Example 2
Example 2 the same structure and construction method as example 1, except that:
the cement stable anti-cracking base layer material is arranged above the cement stable subbase layer and is an anti-cracking cement stable macadam mixture, and the thickness of the anti-cracking cement stable macadam mixture is 15 cm; selecting PC 32.5 as cement in the cement stable anti-cracking base material, wherein the using amount is 6.0%; the grading designed on the upper layer of the asphalt concrete is AC-13 type grading, and the thickness is 6 cm; the grading designed for the lower surface layer of the asphalt concrete is AC-25 type grading, and the thickness is 8 cm; the cement stable subbase layer is a common water stable subbase layer and has a thickness of 15 cm.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, but any modifications or equivalent variations made according to the technical spirit of the present invention are within the scope of the present invention as claimed.
Claims (9)
1. The newly-built pavement structure of the cement-stabilized anti-cracking base course is characterized by comprising an asphalt concrete upper surface layer, an asphalt concrete lower surface layer, a cement-stabilized anti-cracking base course and a cement-stabilized subbase course from top to bottom in sequence; the cement stable anti-cracking base material is an anti-cracking cement stable macadam mixture, and the main components of the cement stable anti-cracking base material are cement, large-particle macadam and small-size aggregate; the cement in the cement stable anti-cracking base material is PC 32.5, and the using amount is 3.0-6.0%; the large-particle broken stone gradation is as follows: the large-particle crushed stone screening device comprises a 75 mm-sized square-hole screen, a 63 mm-sized square-hole screen and a 53 mm-sized square-hole screen, wherein the large-particle crushed stone passing rate is 100%, the large-particle crushed stone passing rate is 90.5%, the large-particle crushed stone passing rate is 82.5%, the large-particle crushed stone passing rate is 31.5mm, and the large-particle crushed stone passing rate is 0%; the small-size aggregate mainly comprises melon seed slices, rice seeds and stone powder;
the construction method of the cement stabilized anti-crack base newly-built pavement structure comprises the following steps:
(1) paving a cement stabilization subbase layer;
(2) paving a cement stable anti-cracking base layer, wherein the cement stable anti-cracking base layer adopts a field layer paving and post-road mixing construction mode, paving large-grained macadam on the field at first, paving and filling small-size aggregate, using a paver to operate in the paving process, using a rotary cultivator to perform field road mixing after paving is finished, ensuring that the large-grained macadam in the anti-cracking cement stable macadam mixture is completely contacted and the small-size aggregate is uniformly filled in gaps inside the large-grained macadam, then using a loader and a manual mode to fill cement in open gaps on the surface of the paved road surface, and finally using a vibratory roller to perform rolling forming; after the cement stable anti-cracking base layer is paved, covering and maintaining the cement stable anti-cracking base layer by using geotextile, paving an upper layer pavement structure after maintaining for at least 7 days, and always ensuring the surface of the cement stable anti-cracking base layer to be wet before paving an upper layer;
(3) paving an asphalt concrete lower surface layer and an asphalt concrete upper surface layer.
2. The newly-built pavement structure with the cement-stabilized anti-cracking base layer according to claim 1, characterized in that the cement-stabilized anti-cracking base layer material is arranged above the cement-stabilized subbase layer and is made of an anti-cracking cement-stabilized macadam mixture with a thickness of 15-20 cm.
3. The cement stabilized anti-crack base newly-built pavement structure as claimed in claim 1, wherein the mass ratio of the large crushed stones to the small aggregate is 56: 44.
4. The newly-built pavement structure with the cement-stabilized anti-cracking base layer according to claim 1, characterized in that the designed gradation of the asphalt concrete upper surface layer is an AC-13 type gradation with a thickness of 4-6 cm.
5. The newly-built pavement structure with the cement-stabilized anti-cracking base layer according to claim 1, characterized in that the asphalt concrete lower layer is designed to have a gradation of AC-25 type and a thickness of 6-8 cm.
6. The cement stabilized anti-crack base layer newly-built pavement structure as claimed in claim 1, wherein the cement stabilized subbase layer is a normal water stabilized subbase layer with a thickness of 15-20 cm.
7. The method for constructing the newly-built pavement structure of the cement-stabilized anti-cracking base course, which is disclosed by claim 1, comprises the following steps of:
(1) paving a cement stabilization subbase layer;
(2) paving a cement stable anti-cracking base layer, wherein the cement stable anti-cracking base layer adopts a field layer paving and post-road mixing construction mode, paving large-grained macadam on the field at first, paving and filling small-size aggregate, using a paver to operate in the paving process, using a rotary cultivator to perform field road mixing after paving is finished, ensuring that the large-grained macadam in the anti-cracking cement stable macadam mixture is completely contacted and the small-size aggregate is uniformly filled in gaps inside the large-grained macadam, then using a loader and a manual mode to fill cement in open gaps on the surface of the paved road surface, and finally using a vibratory roller to perform rolling forming; after the cement stable anti-cracking base layer is paved, covering and maintaining the cement stable anti-cracking base layer by using geotextile, paving an upper layer pavement structure after maintaining for at least 7 days, and always ensuring the surface of the cement stable anti-cracking base layer to be wet before paving an upper layer;
(3) paving an asphalt concrete lower surface layer and an asphalt concrete upper surface layer.
8. Use of a new pavement structure of a cement stabilized anti-crack base course according to claim 1 in a highway.
9. The use according to claim 8, wherein the arterial road is a newly constructed arterial road comprising a semi-rigid base layer.
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| CN112942090B (en) * | 2021-01-27 | 2022-09-23 | 河南中交路通工程监理咨询有限公司 | Construction process of road and bridge structure with large-particle-size asphalt concrete |
| CN112942033B (en) * | 2021-01-27 | 2022-10-25 | 河南中交路通工程监理咨询有限公司 | Pre-splitting construction process for large-particle-size water-stable gravel base |
| CN113718580A (en) * | 2021-09-14 | 2021-11-30 | 中交一公局集团有限公司 | Anti-crack pavement structure and construction method |
| CN114032727A (en) * | 2021-11-30 | 2022-02-11 | 西安长大公路养护技术有限公司 | Construction method of large-particle-size cement regeneration base pavement structure |
| CN114477905B (en) * | 2022-02-16 | 2022-11-25 | 长春市城建维护集团股份有限公司 | Anti-crack road base material and preparation method thereof |
| CN114293441A (en) * | 2022-02-17 | 2022-04-08 | 北京华创空港工程有限公司 | Asphalt concrete paving structure for airport pavement and paving method thereof |
| CN114933451B (en) * | 2022-05-24 | 2022-12-13 | 东南大学 | Asphalt pavement crack dispersion type base material, design method and road structure |
| CN114855529A (en) * | 2022-05-25 | 2022-08-05 | 临湘市路桥工程有限公司 | Track-free asphalt pavement and construction method |
| CN116043632B (en) * | 2022-12-19 | 2024-09-13 | 河南城建学院 | Functional layer used between semi-rigid base layer and asphalt pavement |
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