Durability of reclaimed asphalt pavement–coal fly ash–carbide lime blends under severe environmental conditions

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Title: Durability of reclaimed asphalt pavement–coal fly ash–carbide lime blends under severe environmental conditions
Author(s): Consoli, NC
Scheuermann Filho, HC
Godoy, VB
De Carli Rosembach, CM
Harb Carraro, J
Item Type: Journal Article
Abstract: The sustainable use of industrial residue in enhancing the long-term performance of reclaimed asphalt pavement (RAP) has been proven to be effective under freeze–thaw and wet–dry conditions. This study focuses on coal fly ash (FA) and carbide lime (CL) as the enhancing agents. It evaluates how the durability and long-term performance of compacted RAP–FA–CL mixtures are impacted by dry unit weight and lime content. The tested mixture’s specimens were moulded in three layers through static compaction inside a cylindrical mould. Several single-level variables were used in the stabilisation process. Among these were: FA content of 25%, optimum water content of 9% (modified effort) and seven days of curing. Additionally, three target dry unit weights (17, 18 and 19 kN/m3 – the last of which was determined using the modified Proctor energy) and three percentages of lime content (3%, 5% and 7%) were used for a comparative analysis. The tested specimens’ accumulated loss of mass (after wetting–drying and freezing–thawing cycles) and splitting tensile strength were both evaluated as a function of the porosity/lime index. The experiments revealed that compacted RAP–coal FA–CL mixtures performed noticeably worse when subjected to freezing–thawing cycles than when subjected to wetting–drying cycles. These results indicate an increase in the breadth of the porosity/lime index, as it is shown to control the long-term performance of compacted RAP–coal FA–CL mixtures, in addition to controlling their mechanical response.
Publication Date: 9-Aug-2018
Date of Acceptance: 23-Jul-2018
URI: http://hdl.handle.net/10044/1/62959
DOI: https://dx.doi.org/10.1080/14680629.2018.1506354
ISSN: 1468-0629
Publisher: Taylor & Francis
Journal / Book Title: Road Materials and Pavement Design
Copyright Statement: © 2018 Informa UK Limited, trading as Taylor & Francis Group. This is an Accepted Manuscript of an article published by Taylor & Francis in Road Materials and Pavement Design on 9 Aug 2018, available online: https://www.tandfonline.com/doi/full/10.1080/14680629.2018.1506354
Keywords: 0905 Civil Engineering
Logistics & Transportation
Publication Status: Published online
Embargo Date: 2019-08-09
Online Publication Date: 2018-08-09
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering
Geotechnics



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