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Title: | Laboratory mix design of cold bitumen emulsion mixtures incorporating reclaimed asphalt and virgin aggregates |
Authors: | Chelelgo, Kiplagat Gariy, Zachary C. Abiero Shitote, Stanley Muse |
Keywords: | Cold-mixes Emulsion asphalts |
Issue Date: | 2018 |
Publisher: | MDPI |
Abstract: | Bitumen emulsion asphalts, especially those incorporating marginal and secondary aggregates, are energy efficient, environment friendly, and sustainable alternatives to hot-mix asphalts. This study set out to compare engineering properties of a bitumen emulsion asphalt composed entirely of virgin aggregates with another composed of 55% reclaimed asphalt and 45% virgin aggregates. The aggregates were bound with a slow setting cationic bitumen emulsion composed of 65% base bitumen and 35% water. Marshall specimens molded at varying pre-mix water and bitumen emulsion contents were cured in molds for 24 h before being de-molded and cured for a further 72 h at 40 °C. Dry densities, porosities, and indirect tensile strengths for the cured specimens were determined in dry and soaked states. Virgin aggregate mix, at an optimum binder content of 6.1%, had a tensile strength ratio of 1.3 with corresponding air voids and moisture absorption values of 10.1% and 0.92%, respectively. Similarly, reclaimed asphalt mix at an optimum binder content of 6.2% had a tensile strength ratio of 1.03, with corresponding air voids and moisture absorption values of 7.9% and 0.38%, respectively. Compared to virgin mix, reclaimed asphalt mix had lower air voids and lower moisture absorption values with the overall benefit of enhanced resistance to moisture damage. |
URI: | https://doi.org/10.3390/buildings8120177 http://ir.mu.ac.ke:8080/jspui/handle/123456789/7356 |
Appears in Collections: | School of Engineering |
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