Asphalt mixture tension dynamic modulus measurement method

Abstract

The present invention discloses an asphalt mixture tension dynamic modulus measurement method, which comprises that an upper metal base and a lower metal base are respectively adhered and fixed on theupper end and the lower end of a prepared asphalt mixture cylinder specimen, the lower metal base is fixed on a loading device, the upper metal base is connected to a metal loading rod, and three displacement sensors are vertically arranged at the middle portion of the side surface of the asphalt mixture cylinder specimen according to the circumference at equal intervals; sine wave or haversine axial tension stress is applied on the specimen through the metal loading rod at a specified test temperature and a frequency; and during the loading, the corresponding axial tension stress and the corresponding axial tension strain are collected, and the dynamic modulus is calculated. According to the present invention, the dynamic modulus property of the asphalt mixture is determined under the direct tension force applying mode, such that the mechanical response characteristics of the asphalt mixture can be well and completely evaluated, the test foundation can be established for the asphaltpavement mechanical calculation and the fatigue crack analysis and checking computation, and the method has advantages of simple operation and reliable data, and is easy to promote and use.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to a test method for tensile dynamic modulus of asphalt mixture. Background technique [0002] The modulus of asphalt mixture is an important material parameter in the design and mechanical analysis of asphalt pavement. Compared with the static modulus, the dynamic modulus is more in line with the mechanical response state of asphalt mixture under the action of traffic load. Modulus is gradually replacing static modulus as an input indicator for asphalt pavement design. my country's new version of "Highway Engineering Asphalt and Asphalt Mixture Test Regulations" (JTG E20-2011) refers to the dynamic modulus standard tests such as AASHTO TP62-03 and ASTMD3497 in the United States, and combines the actual test conditions in my country to compile the "Asphalt Mixture List". Axial compression dynamic modulus test" (T0738-2011), used to determine the uniaxial compres...

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of asphalt mixture tensile dynamic modulus test method, solves the deficiency that can't effectively evaluate the dynamic modulus response characteristic of asphalt mixture under tension mode in the prior art, thereby is conducive to better, Evaluate the mechanical response characteristics of asphalt mixture more comprehensively, and lay the experimental foundation for mechanical calculation of asphalt pavement and fatigue cracking analysis and calculation

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