Steady-State Creep of Asphalt Concrete

Abstract

This paper reports the experimental investigation of the steady-state creep process for fine-grained asphalt concrete at a temperature of 20 ± 2 • C and under stress from 0.055 to 0.311 MPa under direct tension and was found to occur at a constant rate. The experimental results also determined the start, the end point, and the duration of the steady-state creep process. The dependence of these factors, in addition to the steady-state creep rate and viscosity of the asphalt concrete on stress is satisfactorily described by a power function. Furthermore, it showed that stress has a great impact on the specific characteristics of asphalt concrete: stress variation by one order causes their variation by 3-4.5 orders. The described relations are formulated for the steady-state of asphalt concrete in a complex stressed condition. The dependence is determined between stress intensity and strain rate intensity.

Modeling of Cyclic Strength for the Asphalt Concrete Considering Damage Accumulation

“…The detailed information about standard characteristics of bitumen and asphalt concrete can be found in the authors' previously published paper [24].…”

“…The tests were carried out in a special assembled installation, which allows applying a load to the asphalt concrete sample within 1 s. The sample strain was measured by means of two clock typed indicators, while data was recorded by a video camera. More detailed information about the device can be also found in the authors' paper [24].…”

“…The 0.31 MPa stress was applied to the tested sample quickly and kept constant for 5 s. Then the stress was removed quickly, and the sample was free of stress for the following 60 s. The test temperature was equal to 22 • C. The tests were carried out in a special assembled installation, which allows applying a load to the asphalt concrete sample within 1 s. The sample strain was measured by means of two clock typed indicators, while data was recorded by a video camera. More detailed information about the device can be also found in the authors' paper [24].…”

“…The failure condition of the asphalt concrete (24) was represented in the form of the Riemann integral. Now, it has been written in the form of Stieltjes integral (26).…”

Structural Health Monitoring and Time-Dependent Effects Analysis of Self-Anchored Suspension Bridge with Extra-Wide Concrete Girder

“…However, the stable and exact measurement of the stress values of structure details may then only be obtained by the durable and sensitive strain gauges embedded in the structure during the construction phase [27][28][29]. In addition, the influences on the bridge safety brought by the vehicle loads [30,31], seismic loads [32,33], environmental corrosions [34,35], and thermal effects [36] had be investigated widely, and the concrete shrinkage & creep (S&C) effects of the laboratory specimens [37] and simple bridge types [38,39] were also widely reported. However, the field measurement for the complicated self-anchored suspension bridge, including the detailed stress and geometry evolution associated with time-dependent effects were rarely reported, especially for the one having such an extra-wide concrete girder [40,41].…”