Sains Malaysiana 45(2)(2016): 279–287

Volumetric Properties and Leaching Effect of Asphalt Mixes with Electric Arc Furnace

Steel Slag and Copper Mine Tailings

(Sifat Isi Padu dan Kesan Larut-Lesap Bancuhan Asfalt dengan Sanga Keluli

Relau Arka Elektrik dan Tahi Lombong Kuprum)

Ebenezer Akin Oluwasola, Mohd Rosli Hainin*, Md. Maniruzzaman A. Aziz & M. Naquiddin M. Warid

Department of Geotechnics and Transportation, Faculty of Civil Engineering and

UTM Construction Research Center (CRC), Universiti Teknologi Malaysia (UTM),

81310 Skudai, Johor Darul Takzim, Malaysia

Received: 24 April 2014/Accepted: 8 July 2015

ABSTRACT

This study focuses on the potential of electric arc furnace (EAF) steel slag and copper mine tailings as asphalt paving materials with respect to issues of volumetric properties and leaching. In this study, four different asphalt mixes were investigated; each contained EAF steel slag and copper mine tailings of various proportions. Apart from the microstructure analysis of the materials, a toxicity characteristics leaching procedure (TCLP) test was conducted on both the mixes and the aggregates. All the mixes were evaluated by the following parameters: Voids in the mineral aggregates (VMA), voids in total mix (VTM), voids filled with asphalt (VFA), Marshall stability and flow and specific gravity. F-test ANNOVA was used to evaluate the degree of significance of the mixes with each of the evaluated standards. It was observed that the mixes containing either EAF steel slag or copper mine tailings or both gave better results than the control mix. In terms of the TCLP test, none of the detected hazardous elements exceeded the standard limits, which indicates the possibility of using them as construction materials.

Keywords: Asphalt; copper mine tailings; EAF steel slag; TCLP test; volumetric properties

ABSTRAK

Kajian ini memberi tumpuan kepada potensi sanga keluli relau arka elektrik (EAF) dan tahi lombong kuprum sebagai penurapan bahan asfalt yang berkaitan dengan sifat isi padu dan larut- lesap. Dalam kajian ini, empat bancuhan asfalt berbeza telah dikaji; setiap satu mengandungi sanga keluli EAF dan tahi lombong kuprum pada kadar berbeza. Selain daripada analisis mikrostruktur bahan, satu ujian prosedur ciri ketoksikan larut-lesap (TCLP) telah dijalankan ke atas bancuhan tersebut dan agregatnya. Semua bancuhan telah dinilai menggunakan parameter berikut: lompang dalam agregat galian (VMA), lompang dalam jumlah campuran (VTM), lompang yang dipenuhi dengan asfalt (VFA), kestabilan Marshall serta aliran dan graviti tertentu. Ujian-F ANNOVA digunakan untuk menilai tahap signifikasi bancuhan tersebut dengan setiap satu daripada piawai yang dinilai. Adalah diperhatikan bahawa bancuhan yang mengandungi sama ada sanga keluli EAF atau tahi lombong kuprum atau kedua-duanya memberikan keputusan yang lebih baik daripada campuran kawalan. Daripada segi ujian TCLP, tiada unsur berbahaya yang dikesan melebihi had piawai justeru menunjukkan kemungkinan untuk penggunaan bancuhan tersebut sebagai bahan binaan.

Kata kunci: Asfalt; sanga keluli EAF; sifat isi padu; tahi lombong kuprum; ujian TCLP

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*Corresponding author; email: mrosli@utm.my