This study investigates the effect of using steel slag in different layers of a flexible pavement structure on the permanent deformation performance and life cycle cost (LCC). Materials were obtained from a recent expressway pavement construction project. Physical and chemical properties of steel slag produced in Oman indicated that it can be used in the pavement layers. Results indicated that 100% of slag can be used in the base or subbase layers resulting in a CBR value of 212%. For wearing course (WC) and bituminous base course (BBC) layers, a 30% and 25% replacement of coarse aggregate was recommended based on Marshall mix design method. A finite element program was used to model the pavement sections. Rutting performance was determined based on the dynamic modulus |E*| results and mechanistic empirical pavement design guide (MEPDG) rut models. Rutting was not significantly different from the control section when steel slag was used in the base and/or subbase pavement structure. Rutting increased from 12.5 to 17.9 mm at the end of design life when slag was used in the WC layer. Further increase in rutting resulted when the steel slag was introduced in the BBC layer. LCC analysis based on 75 mm milling and overlay and zero slag cost indicated a reduction of 29.4% in cost when slag is used in both base and subbase layers. Steel slag in WC was recommended for lower volume roads with a higher target rut depth (16.5 mm), in which case LCC increased by 12% compared to the control section.
|دورية||International Journal of Pavement Research and Technology|
|المعرِّفات الرقمية للأشياء|
|حالة النشر||Accepted/In press - 2023|
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