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Appl. Sci. 2017, 7(2), 142; doi:10.3390/app7020142

Steady-State Creep of Asphalt Concrete

1
Department of Mechanics, Al-Farabi Kazakh National University, Almaty 050040, Kazakhstan
2
Kazakhstan Highway Research Institute, Almaty 050061, Kazakhstan
3
Department of Chemistry and Chemical Technologies, University of Calabria, Rende 87036, Italy
*
Author to whom correspondence should be addressed.
Academic Editors: Zhanping You, Qingli (Barbara) Dai and Feipeng Xiao
Received: 11 November 2016 / Revised: 21 January 2017 / Accepted: 25 January 2017 / Published: 4 February 2017
(This article belongs to the Special Issue Advanced Asphalt Materials and Paving Technologies)
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Abstract

This paper reports the experimental investigation of the steady-state creep process for fine-grained asphalt concrete at a temperature of 20 ± 2 °С 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. View Full-Text
Keywords: asphalt concrete; creep curve; steady-state creep; strain rate; viscosity; stress intensity; strain intensity asphalt concrete; creep curve; steady-state creep; strain rate; viscosity; stress intensity; strain intensity
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Iskakbayev, A.; Teltayev, B.; Oliviero Rossi, C. Steady-State Creep of Asphalt Concrete. Appl. Sci. 2017, 7, 142.

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