Simple Approach for the Determination of Temperature Susceptibility Characteristics of Pure and Modified Asphalt Binders
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RESEARCH ARTICLE-CIVIL ENGINEERING
Simple Approach for the Determination of Temperature Susceptibility Characteristics of Pure and Modified Asphalt Binders Saadoon Obaid Eyada1,2
· Osman Nuri Çelik1 · Mohammed Abbas1
Received: 2 May 2020 / Accepted: 26 October 2020 © King Fahd University of Petroleum & Minerals 2020
Abstract Asphalt is considered as a valuable construction material because of its strong, adhesive, and durable characteristics. Asphalt cement (AC) binder is a viscoelastic material with different behaviors under different climate conditions, traffic loadings, and speed. Dynamic modulus of asphalt mixtures E* is an important factor in pavement design. The determination of E* is either by direct testing, which is difficult and expensive, or by using correlations with simple tests. Most correlations depend on viscosity’s determination under different temperatures and loading rates (speed), which can be calculated using temperature susceptibility parameters A–VTS values. This study aims to determine a simple and appropriate method to calculate A–VTS parameters using simple tests. An experimental program has been conducted for testing different typical virgin and modified asphalt binders in Turkey. The results have been analyzed using mechanistic–empirical pavement design method (MEPDM) with an available analysis tool. A simple method for the determination of A–VTS has been recommended using penetration tests at temperatures of 4, 25, and 35 °C, and other significant findings were recorded. Keywords Mechanistic–empirical design · Dynamic modulus · A–VTS · Turkish design manual
1 Introduction Asphalt is considered as a valuable construction material because of its strong, adhesive, and durable characteristics. Asphalt cement (AC) binder is a viscoelastic material. Its behavior depends on both temperature and loading rate. In hot climates such as in the coastal region in Turkey, or under sustained loads, AC binder behaves more like a viscous liquid. On the other hand, in a cold climate as in the Anatolia region in Turkey, or under high speed, asphalt behaves more like elastic solids. Here, the AC may become stiff and cracks when excessively loaded. Under such circumstances, AC’s behavior under different temperatures and traffic conditions (speed) must be carefully studied since it has a signifi-
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Saadoon Obaid Eyada [email protected] Osman Nuri Çelik [email protected] Mohammed Abbas [email protected]
1
Civil Engineering Department, Selcuk University, Selçuklu, Konya 42000, Turkey
2
Iraqi Ministry of Health, Ramadi, Anbar, Iraq
cant effect on pavement life. Traditionally, the physical and rheological characterization of binders is accomplished by conducting conventional tests (CT) such as: penetration, softening point, viscosity, and ductility [1]. Besides, rotational viscosity (RV) is used to characterize its temperature–viscosity behavior over a wide range of temperatures [2]. The mechanistic–empirical pavement design method (MEPDM) uses a dynamic modulus (E*) master curve to char
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