Journal Published Online: 21 August 2023
Volume 47, Issue 1

Laboratory Testing of Ferrochrome Slag as an Aggregate in Porous Pavements

CODEN: GTJODJ

Abstract

Porous asphalt (PA) is a bituminous mixture that is preferred in surface wearing courses because of its comparably better skid resistance and reduced spraying and hydroplaning risk, leading to improved driving quality compared with dense-graded hot mix asphalt mixtures. Use of recycled materials with satisfactory strength and durability properties as an aggregate in PA mixtures would provide both economic and environmental benefits because natural resources would be preserved, and transportation costs, and consequently CO2 emissions, would be reduced, and the stockpiled recycled material would be employed instead of occupying scarce landscape. However, because of the high air void content and exposure of a larger surface area to atmosphere in PA mixtures, the potential for raveling and rapid aging for any proposed aggregate material needs to be evaluated carefully. This study was conducted to investigate the performance of ferrochrome slag (FS), a by-product of ferrochromium industries, as an aggregate in porous asphalt. Air voids content, permeability, particle loss, tensile strength, and moisture susceptibility were measured on three different gradations of FS and the results were compared with the limits given in construction specifications. The gradation of the slag aggregates along with the bitumen content played a key role on performance of the PA mixtures. The FS specimens prepared at an optimum bitumen content of 6.5 % performed significantly better than limestone (LS) aggregate specimens at the same gradation; the air void content, permeability, and tensile strength of the FS mixtures were 2 %, 50 %, and 16 % higher than the LS mixtures, respectively.

Author Information

Topaloglu, Sedat
Department of Civil Engineering, School of Engineering and Architecture and Design, Kutlubeyyazicilar Campus, Bartin University, Bartin, Turkey
Cetin, Altan
Department of Civil Engineering, School of Engineering and Architecture and Design, Kutlubeyyazicilar Campus, Bartin University, Bartin, Turkey
Dayioglu, Asli Y.
Department of Civil Engineering, School of Civil Engineering, Rm 140408, Istanbul Technical University, Istanbul, Turkey
Aydilek, Ahmet H.
Department of Civil and Environmental Engineering, University of Maryland, College Park, MD, USA
Pages: 18
Price: $25.00
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Stock #: GTJ20220249
ISSN: 0149-6115
DOI: 10.1520/GTJ20220249