ASSESSMENT OF TEMPERATURE BEHAVIOR OF MODIFIED LOW-GRADE BITUMEN COMPARED TO HIGHER-GRADE BINDERS
DOI:
https://doi.org/10.71031/qhsi.2025.v1.i4.005Keywords:
bitumen, bitumen softening point, ductility, bitumen flash point, brittleness, RTFOT test.Abstract
To ensure the durability of asphalt concrete pavements, different grades of bitumen are used depending on the climatic zone: for hotter southern regions, lower-grade bitumens such as 70/100 and below are applied, while for colder northern regions, bitumen grade 100/130 is used. However, bitumen is prone to aging under the influence of temperature and solar radiation, which reduces its elasticity, adhesion, and resistance to deformation. The aim of this study is to analyze the effect of a modifying additive on the properties of low-grade bitumen and to compare the obtained results with the characteristics of higher-grade bitumen. Tests were carried out on bitumen samples of grades M 50/70 and M 70/100 from various manufacturers. Accelerated aging of the bitumen samples was conducted in an RTFOT chamber to simulate natural aging conditions. Thus, the inclusion of a modifier in low - grade bitumen does not negatively affect the deterioration of its temperature - related properties; moreover, in some cases, it demonstrates results superior to those of higher - grade bitumen.
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