Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 52, Issue -, Pages 245-252Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2013.10.069
Keywords
SBS copolymer; Polymer modified bitumen; Thermal stability; Phase separation; Structure
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Polymer modified bitumens, PMBs, are usually prepared at high temperature and subsequently stored for a period of time, also at high temperature. The stability of PMBs, in these conditions, has a decisive influence in order to obtain the adequate performances for practical applications. In this article the attention is focused in the analysis of the factors that determine the stability of styrene-butadiene-styrene copolymer (SBS)/sulfur modified bitumens when the mixtures are maintained at high temperature. Bitumens from different crude oil sources were used to prepare SBS/sulfur modified bitumens. Changes in the values of viscosity, softening point, as well as in the morphology of PMB samples, stored at 160 degrees C, were related to the bitumen chemical composition and to the amount of asphaltene micelles present in the neat bitumen used in their preparation. (C) 2013 Elsevier Ltd. All rights reserved.
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