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Method for establishing an asphalt pavement asphalt layer on-site modulus main curve

A technology of asphalt pavement and establishment method, which is applied in special data processing applications, instruments, electrical digital data processing, etc., and can solve the problems of unclear stress relationship of asphalt layer and lack of asphalt pavement paving, etc.

Pending Publication Date: 2019-06-21
TONGJI UNIV
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Problems solved by technology

[0003] For this reason, the embodiment of the present invention provides a method for establishing the master curve of the on-site modulus of the asphalt layer of the asphalt pavement, so as to solve the problem that the force relationship of the asphalt layer of the existing asphalt pavement is not clear, resulting in no guidance data for the laying of the asphalt pavement

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  • Method for establishing an asphalt pavement asphalt layer on-site modulus main curve
  • Method for establishing an asphalt pavement asphalt layer on-site modulus main curve
  • Method for establishing an asphalt pavement asphalt layer on-site modulus main curve

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Embodiment

[0035] This embodiment discloses a method for establishing the master curve of the field modulus of the asphalt layer on the asphalt pavement. figure 2 , the transverse strain sensor 1 and the longitudinal strain sensor 2 are buried in the asphalt layer of the asphalt pavement on a steel bridge deck. Since the road surface contains two layers of asphalt, the transverse strain sensor 1 and the longitudinal strain sensor 2 are buried at the bottom of each asphalt layer .

[0036] On-site loading tests were carried out using standard loading vehicles, and the corresponding strain data in the asphalt layer were collected. The field loading tests included three different asphalt layer temperatures, 31°C, 22°C and 4°C. The loading test at each temperature included four different loading speeds of the loading vehicle, namely 2km / h, 10km / h, 20km / h and 40km / h. The on-site loading test includes twelve different loading conditions, and the data acquisition frequency is 100 Hz during the...

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Abstract

The embodiment of the invention discloses a method for establishing an asphalt pavement asphalt layer on-site modulus main curve. The establishment method comprises the following steps of: establishing a database, embedding a transverse strain sensor and a longitudinal strain sensor at the bottom of the asphalt layer of the asphalt pavement; detecting transverse strain and longitudinal strain of the bottom of the asphalt layer of the asphalt pavement under different loading conditions; calculating equivalent loading frequencies of the road surfaces corresponding to different loading speeds according to the measured transverse strain and longitudinal strain; acquiring on-site modulus of each asphalt layer under different loading conditions i through back calculation by using abaqus finite element software, establishing an on-site modulus main curve according to a back calculation result, verifying the on-site modulus main curve by using verification data, wherein the deviation is less than 20%, so that the established on-site modulus main curve is proved to be effective data. The method solves the problem that the asphalt pavement design has no guidance data due to unclear stress relation of the asphalt layer of the existing asphalt pavement.

Description

technical field [0001] The embodiments of the present invention relate to the field of road engineering, and in particular to a method for establishing an on-site modulus master curve of an asphalt layer on an asphalt pavement. Background technique [0002] At present, the pavement materials of my country's high-grade highways are mainly asphalt mixture, and the pavement materials of some concrete bridges and steel bridges are also asphalt mixture. Asphalt mixture is a typical viscoelastic material, and its mechanical properties are affected by loading temperature and loading speed. Therefore, it is necessary to fully consider the influence of different loading conditions on the stress state of asphalt pavement. In the field of road engineering, the modulus master curve is usually used to characterize the viscoelastic mechanical properties of asphalt mixture. However, the current research only uses indoor small-scale tests to establish the indoor modulus master curve of asp...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 孙立军程怀磊刘黎萍
Owner TONGJI UNIV
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