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Corresponding Author

Abdel-Motaleb, Mohamed

Subject Area

Civil and Environmental Engineering

Article Type

Original Study

Abstract

The ability to characterize paving materials in terms of fundamental properties is becoming increasingly more important. This is partially due to the fact that many agencies are beginning to use pavement design system based on elastic theory. The most required inputs in the elastic theory are Elasticity modulus (E) and Poisson's ratio (u) of asphalt layer. So, the current study is primarily concerned with simplifying a technique that can be used, in pavement design phase, for predicting the expected structural properties of asphalt layer at the actual temperature and loading rate of traffic. To achieve this objective, many paving mixes typically used in pavement construction, were formed using different aggregate types and gradations, asphalt contents and compaction efforts. Then, the structural properties of these mixes were measured using indirect tensile test at three test temperatures along with four rates of loading. Also routine mix characteristics of these mixes were measured using Marshall method. Prediction models for a definite combination of temperature and rate of loading were developed using the results of indirect tensile tests and routine mix characteristics. Then, a general models were developed. These models can be used to predict the expected structural properties of an asphalt mix at the actual temperature along with the expected loading rate of traffic with the aid of routine mix characteristics. The estimated values of the investigated structural properties using the developed models are within 95 % of the measured values

Keywords

Asphalt concrete; Elasticity modulus; Poisson ratio; tensile strength; Tensile strain; Indirect tensile test; Rate of loading and Temperature

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