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Buildings 2018, 8(12), 177; https://doi.org/10.3390/buildings8120177

Laboratory Mix Design of Cold Bitumen Emulsion Mixtures Incorporating Reclaimed Asphalt and Virgin Aggregates

1
Department of Civil Engineering, Pan African University, Institute for Basic Sciences, Technology and Innovation, P.O. Box 62000-00200, Nairobi, Kenya
2
Department of Civil, Construction & Environmental Engineering, Jomo Kenyatta University of Agriculture & Technology, P.O. Box 5505-00100, Nairobi, Kenya
3
Department of Civil Engineering, Rongo University (RU), P.O. Box 103-40404, Rongo, Kenya
*
Author to whom correspondence should be addressed.
Received: 2 November 2018 / Revised: 30 November 2018 / Accepted: 4 December 2018 / Published: 10 December 2018
(This article belongs to the Special Issue Green Building Materials)
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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. View Full-Text
Keywords: cold-mixes; emulsion asphalts; reclaimed asphalt; recycled materials; bitumen-emulsion; indirect tensile strength; tensile strength ratio cold-mixes; emulsion asphalts; reclaimed asphalt; recycled materials; bitumen-emulsion; indirect tensile strength; tensile strength ratio
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Chelelgo, K.; C. Abiero Gariy, Z.; Muse Shitote, S. Laboratory Mix Design of Cold Bitumen Emulsion Mixtures Incorporating Reclaimed Asphalt and Virgin Aggregates. Buildings 2018, 8, 177.

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