Speaker
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Abstract. The present study has been developed to investigate the combined effect of 20 % de-icing salts solutions (calcium chloride, magnesium chloride and sodium chloride) and freeze and thaw (F–T) cycles on bituminous binders and asphalt mixture performance at medium and low service temperatures. In the study were included conventional and SBS-polymer modified bitumen with amido-amines based anti-stripping additive. Twenty F-T cycles were carried out (16 h at (18 ± 2) oC and 8 h at (20 ±2) oC). Bituminous binders and asphalt mixtures were subjected to short and long term aging. Unaged and aged binders and asphalt mixtures were subjected to the combined impact of salts solutions and F-T cycles. For bituminous binders fatigue parameter (G*.sin(δ)), flexural creep stiffness S and “m-value” were determined and for compacted asphalt mixtures indirect tensile strength ratio at 0oC was determined. The main conclusions from the study are as follow: SBS-polymer modified bitumen show better low temperature and fatigue resistance than conventional bitumen; De-icing salts solutions combined with freeze and thaw cycles have negative impact on both asphalt mixtures and bituminous binders’ performance at medium and low temperatures.
