Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
For the characterization of the permanent deformation behavior (rutting) of asphalt concrete (AC), the triaxial cyclic compression test (TCCT) is a standardized test method. The test simulates traffic loading by applying a sinusoidal compressive stress in vertical direction and a radial confining pressure, which simulates the confinement of the specimen within the pavement structure. As a result the permanent axial strain versus load cycles is obtained. In the standard test procedure the confining pressure is held constant throughout the test to simplify the test control. However, in reality the confining pressure oscillates in a sinusoidal way with a certain phase lag to the vertical loading due to the viscoelastic characteristics of AC. The phase lag of hot mix asphalt (HMA) depends on the temperature and load frequency. The paper presents an innovative approach to improve the TCCT by implementing sinusoidal confining pressure. Strain gauges are attached directly to the specimen's surface to measure the radial deformation and to obtain the phase lag between the axial loading and the radial reaction. These experiments are carried out for various mixtures at temperatures ranging from 10°C to 50°C and frequencies from 0.1 Hz to 30 Hz. Thus, radial strain and phase lag can be analyzed as a function of temperature and loading frequency. In a second step the sinusoidal confining pressure with the obtained phase lag will be implemented into the test routine and results from standard TCCTs with constant confining pressure versus improved TCCTs with oscillating pressure can be compared and discussed.
For the characterization of the permanent deformation behavior (rutting) of asphalt concrete (AC), the triaxial cyclic compression test (TCCT) is a standardized test method. The test simulates traffic loading by applying a sinusoidal compressive stress in vertical direction and a radial confining pressure, which simulates the confinement of the specimen within the pavement structure. As a result the permanent axial strain versus load cycles is obtained. In the standard test procedure the confining pressure is held constant throughout the test to simplify the test control. However, in reality the confining pressure oscillates in a sinusoidal way with a certain phase lag to the vertical loading due to the viscoelastic characteristics of AC. The phase lag of hot mix asphalt (HMA) depends on the temperature and load frequency. The paper presents an innovative approach to improve the TCCT by implementing sinusoidal confining pressure. Strain gauges are attached directly to the specimen's surface to measure the radial deformation and to obtain the phase lag between the axial loading and the radial reaction. These experiments are carried out for various mixtures at temperatures ranging from 10°C to 50°C and frequencies from 0.1 Hz to 30 Hz. Thus, radial strain and phase lag can be analyzed as a function of temperature and loading frequency. In a second step the sinusoidal confining pressure with the obtained phase lag will be implemented into the test routine and results from standard TCCTs with constant confining pressure versus improved TCCTs with oscillating pressure can be compared and discussed.
Assessment of Permanent Deformation Behavior of Asphalt Concrete by Improved Triaxial Cyclic Compression Testing
First Congress of Transportation and Development Institute (TDI) ; 2011 ; Chicago, Illinois, United States
T&DI Congress 2011 ; 396-405
11.03.2011
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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