期刊
ROAD MATERIALS AND PAVEMENT DESIGN
卷 -, 期 -, 页码 -出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/14680629.2023.2203758
关键词
Asphalt; oxidation; rheology; chemistry; crossover temperature (T-cross); fatigue
Fatigue damage is affected by low-temperature conditions, and the relationship between fatigue and temperature needs to be studied. Oxidation is known to make asphalt brittle, and it is usually associated with fatigue. This study aims to propose a tool that can connect the chemistry and rheology of asphalt.
Fatigue damage is related to low-temperature conditions. Under this assumption, a question arises: why does fatigue occur at temperatures at which it should not and what methods should be used to study this phenomenon? Additionally, it is well known that oxidation causes asphalt to become brittle. Therefore, oxidation is usually associated with fatigue. As asphalt oxidizes, it changes its chemical composition affecting its rheology, the polarity increases, causing more rigid molecular structures to appear that directly affects its elastic response in turn. Consequently, the aim of this study is to propose a tool that relates chemistry and rheology. The method RHEO-PLUS (RHEO+) offers the possibility of correlating the viscoelastic mechanical properties measured in the rheometer, with the changes in the chemical composition of the oxidised asphalt. Based on RHEO+ it is possible to recognise whether the binder is in optimal conditions, aged (by loss of volatile fraction), or oxidised.
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