Laboratory evaluation of the effect of bentonite on performance of bitumen and hot mix asphalt mixtures |
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Authors: | Alireza Ameli Seyed Erfan Tabatabaei Razi |
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Affiliation: | 1. Department of Civil Engineering, Faculty of Engineering, Malard Branch, Islamic Azad University, Malard, Tehran, Iran;2. School of Civil Engineering, Payame Noor University (PNU), Tehran, Iran |
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Abstract: | In this research study, bentonite additive was used to modify original binder (60–70 penetration grade). The experimental program included use of five percentages of bentonite (10%, 15%, 20%, 25%, and 30%) by weight of bitumen. Physical properties of modified and unmodified bitumen were evaluated through penetration grade, softening point, ductility, and temperature susceptibility tests. The performance characteristics of mixtures were determined through indirect tensile strength, resilient modulus, and moisture susceptibility tests. The results demonstrate that addition of bentonite improves Marshall stability, tensile strength, and resilient modulus of mixtures, but led to decrease the resistance to moisture damage. |
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Keywords: | Asphalt mixture bentonite bitumen moisture susceptibility resilient modulus |
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