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RESEARCHING THE EFFECTS OF DIFFERENT AGGREGATES AND BITUMEN TYPES ON ASPHALT MIXTURES
Abstract
The main purpose of this research is to analyse the influence of different natural aggregate sources, as well as different bitumen types, on the adhesion and affinity between the two materials and on the properties of stone mastic asphalt (SMA). The aggregates used in this study were both fine (sand 0/4) and coarse (4/8 and 8/16), extracted from four different natural rock quarries in Romania, selected after a geographical, geological and geomorphological analysis. From a petrographic point of view, the rocks extracted in the proposed quarries are igneous. Adhesion and affinity tests on bitumen coated aggregates were performed, while also employing an anti-stripping agent in the process. Regular paving grade bitumen 50/70, as well as polymer modified bitumen (PMB) 45/80-65, were used. All tests have shown that using an anti-stripping agent improves both bitumen adhesion to natural aggregates and the affinity between the two. Afterwards, laboratory tests on SMA samples, prepared using the same types of bitumen, aggregates and additive, were performed. Although the results were variable and no general conclusion could be drawn, they were clearly influenced by the shape and nature of the mineral aggregates, as well as by the bitumen types and grades.
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References10
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