#TITLE_ALTERNATIVE#

• Main Author: LUHNIRA PERDANA (NIM: 25313020), AIRINE
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/25232
• Institution: Institut Teknologi Bandung

<p align ="justify">Slag leachate pollution can be a great environmental concern due to generation of slag in numerous amounts of iron and steel-making industries. During periods of acid rain, these exposed slags release heavy metals into surface and groundwater. Slag utilization as asphalt concrete-wearing course (AC-WC) is a minimization effort to limit heavy metals migration. Ministry Regulation No.2/2008 requires two criteria of slag utilization that are safety for environmental and technical feasibility. The aim of research is investigated the utilization of iron and steel slag as AC-WC aggregate by solidification due to regulatory criteria. Blast furnace and basic oxygen furnace slag were used as substitute aggregate. Leachability of heavy metals produced from slag and solidification products were analyzed by ANC test, standard and modified TCLP test, static and dynamic leaching test. Physical characteristics show both slags potentially used as AC-WC aggregate because it meets Dep. Public Works specifications, includes low abrasive, high cleanliness, high specific gravity, low water absorption, high angularity, high bitumen viscosity, low soundness, and no flat and elongated particles. Chemical characteristics show both slags have class C pozzolanic properties to support AC-WC mixture strength. Fe (641.5; 692.25 mg/kg), Ba (17.25; 17.75 mg/kg), Zn (17.25; 17.75 mg/kg), Cr (7.75; 9.75 mg/kg), and Cd (5.25; 5.75 mg/kg) are the major pollutants that contain in both type of slags. Due to aggregate gradation, Marshall and PRD, and performance results, optimum condition ocured when 5.9% asphalt Pen 60/70 mixed with 57% coarse, 28% intermediate, and 15% fine aggregate of BF slag. And optimum when mixed with 58% coarse, 32% intermediate, and 10% fine aggregate of BOF slag. Standard and modified TCLP test show BF, BOF slag, and solidification products are have no toxic characters. Static leaching rate of metals show Fe>Zn>Ba>Cd>Cr and Ba>Cr>Fe>Zn>Cd for dynamic. Low cumulative heavy metals released percentage, indicated solidification process by asphalt binder succeded to immobilized contaminants. Asphalt binder caused micro encapsulation of heavy metals in chemical reactions absence. Statically results, iv show no significance difference heavy metals leaching concentrations between aggregate fraction (coarse, intermediate, and fine). Solidification products as AC-WC mixture capable to decreased heavy metals leaching concentrations, typically Ba, Cd, and Cr. Heavy metals leaching behavior influence by chemical properties of waste material include heavy metals content, metal oxide content, and minerals content, also leaching contact time. All heavy metal parameters concentration in leachate were below the quality standars of TCLP column A and B refer to GR 101/2014. It indicated BF and BOF slag environmentally safe and technically feasible used as raw materials of AC-WC mixture.<p align ="justify">