Structural maintenance and design method of semi-rigid base-layer asphalt pavement

A semi-rigid base, asphalt pavement technology, applied in road repair, roads, roads, etc., can solve the problems of single design index and cannot reflect the service life of old roads.

Active Publication Date: 2015-06-24
SOUTHEAST UNIV
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Problems solved by technology

It is estimated that about 12% of the asphalt pavement in my country needs to be maintained every year, and the conventional structural maintenance design method in China basically checks the mechanical response

Method used

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  • Structural maintenance and design method of semi-rigid base-layer asphalt pavement
  • Structural maintenance and design method of semi-rigid base-layer asphalt pavement
  • Structural maintenance and design method of semi-rigid base-layer asphalt pavement

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Embodiment

[0050] Embodiment: Taking the maintenance and reconstruction project of a highway project in East China as an example, by investigating the road surface cracking situation of the old road, it is determined that the road surface condition index PCI=60 of this highway is medium, and the original asphalt surface layer can be improved by adding new asphalt surface Road repairs. The deflection test was carried out with a drop-weight deflection meter and back-calculated to obtain the design parameters of the old pavement structure, the rebound modulus E of subgrade 1 0 =50MPa, the equivalent elastic modulus E of semi-rigid base layer 2 of the old road 1 =2000MPa, base layer thickness H 1 =0.5m, the modulus E of the old asphalt pavement 3 2 =3500MPa, thickness H 2 = 0.18m. The asphalt mixture AC13 used in the asphalt layer 4 was obtained through laboratory tests to obtain its dynamic flexural modulus E 3 =4000MPa, and correct the relevant parameters a and b in the fatigue equati...

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Abstract

The invention discloses a structural maintenance and design method of a semi-rigid base-layer asphalt pavement. The structural maintenance and design method is characterized by comprising the following steps: rating pavement cracking conditions according to a pavement condition index PCI, and sampling asphalt pavements with intermediate or serious cracking conditions by virtue of cooperation of a falling weight deflectometer FWD and a pavement drilling core, so as to acquire design parameters of each structural layer, wherein the design parameters include the thickness and the modulus of each structural layer of a primary pavement; detecting the fatigue property of an asphalt mixture of an overlay, wherein the fatigue property can be estimated by measuring volume parameters and substituting the volume parameters into an empirical formula and can be actually measured by virtue of an indoor fatigue test; establishing a 3D pavement overlay structure finite element model, counting maximum equivalent strain epsilonVM at the bottom of an asphalt overlay layer at a crevice position, substituting epsilonVM into a fatigue equation, and correcting a pavement fatigue life by virtue of an environmental correction coefficient, so as to finally obtain the thickness of the asphalt overlay layer.

Description

technical field [0001] The invention relates to an asphalt pavement maintenance design method, in particular to a structural maintenance design method for a semi-rigid base asphalt pavement. Background technique [0002] By the end of 2013, China's expressways had exceeded 100,000 kilometers, ranking first in the world in terms of total mileage. Since the 1990s, China has entered a period of rapid development of road construction, especially since China implemented a proactive fiscal policy in 1998, the number of road construction projects and the amount of investment have attracted worldwide attention. Highway construction is not only a pillar industry of the national economy, but also a large consumer of energy and resources, facing the arduous task and important responsibility of resource conservation and environmental protection. [0003] Semi-rigid base asphalt pavement is the main structural form of highway pavement in my country, and its service performance within th...

Claims

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Application Information

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IPC IPC(8): E01C23/01
CPCE01C23/01
Inventor 黄晓明祝谭雍高英
Owner SOUTHEAST UNIV
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