Bitumen is an organic substance widely used in laying highway pavement because of factors like cost, availability, curing time, and environmental effects. Given improper design of pavements and selection of materials, asphalt mixtures may not perform well against certain phenomena like aging, rutting, stripping, fatigue, and thermal cracking. Therefore, in order to improve the performance of asphalt mixtures, it is necessary to add modifiers to bitumen, such as polymers, rubber, and clays. Among the modifiers, styrene butadiene rubber (SBR) is one of the most useful and effective materials for paving. In this study, the effects of SBR/nanoclay (NC) and SBR latex on the rheological properties of bitumen and the performance of asphalt mixtures were assessed. SBR/NC and SBR latex were made and mixed with bitumen. The morphologies of the samples were verified by fluorescent microscopy. The results indicate that SBR/NC-modified bitumen improved the dispersion in the asphalt matrix. The addition of modifiers increased the rotational viscosity, but all of the samples were workable during field placement and compaction of hot mix asphalt (HMA). High-temperature storage stability tests indicated that SBR/NC-modified bitumen is more stable than SBR-latex-modified bitumen. SBR/NC-modified bitumen showed a higher complex modulus G*, a lower damping factor, totally improved viscoelastic properties, and superior high- temperature performance for both unaged and short-term aged asphalt. Indirect tensile fatigue test results showed that asphalt mixtures made from nanocomposite-modified bitumen have greater resistance to fatigue than SBR-latex-modified bitumens.
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Salehfard et al. (2016) studied this question.
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