Uniaxial Dynamic Compressive Behaviors of Hydraulic Asphalt Concrete under the Coupling Effect between Temperature and Strain Rate

Abstract

To investigate the compressive dynamic properties of hydraulic asphalt concrete under various temperatures, four temperatures and four strain rates have been set to perform the uniaxial compression experiments using hydraulic servo machine in this paper. The influence of temperature and strain rate on the failure modes, stress-strain curves and mechanical characteristic parameters of hydraulic asphalt concrete is analyzed and the results reveal that the failure modes and stress-strain curves have significant temperature effect. When the temperature is between −20 °C and 0 °C, the failure mode is dominated by brittle failure of asphalt binder, and hydraulic asphalt concrete shows obvious strain softening. With the addition of temperature, the failure modes of specimens are transferred from brittle failure to ductile failure since the asphalt changes from elastic-brittleness to viscoelasticity. Influenced by temperature effect, the compressive stress-strain curves of hydraulic asphalt concrete show strain hardening while the peak stress of hydraulic asphalt concrete is obviously decreased, and the variation coefficient of peak stress has a power relation with temperature. With successive increases in strain rate, the stress-strain curves of hydraulic asphalt concrete gradually are transferred from strain hardening to strain softening. The peak stress and stiffness modulus of specimens under compression gradually increase, and the dynamic increase factor of peak stress is linearly related with the logarithm value of strain rate after dimensionless treatment. In terms of the quantitative analysis of the experimental data, two relationship models of the coupling effect between temperature and strain rate are proposed. The proposed models have good applicability to the quantitative analysis of the experimental results in the manuscript. This paper offers important insights into the application and development of hydraulic asphalt concrete in hydraulic engineering.

Evaluation on the Performance of Hydraulic Bitumen Binders under High and Low Temperatures for Pumped Storage Power Station Projects

“…The asphalt concrete impermeable layer is usually regarded as the most important structural layer, which requires good anti-seepage, thermal and water stability, crack resistance, durability and workability during construction [ 3 , 4 ]. The selection of raw material and the mix design of the dense-graded asphalt concrete thus become very important, since they are closely related to the above functions and the performance of the impermeable layer [ 5 , 6 ].…”

Dynamic Characteristics of Asphalt Concrete as an Impervious Core in Embankment Dams under Varying Temperatures and Stress States

“…The asphalt concrete core is usually positioned in the central region of the embankment dam and protected by the embankment on the sides [8]. As a result, the environmental conditions in that area remain relatively stable.…”

“…Static loads include structural deadweight, water pressure, and the weight of structural attachments and equipment. Dynamic loads, however, incorporate earthquakes, wind loads, and water strikes [8], especially in ACEDs located in an earthquake-prone area. Additionally, the dynamic properties of HAC are related to various factors, including internal factors, such as asphalt content and asphalt mixture gradation, and external factors, such as temperatures, principal stress ratios, and confining pressures.…”