Abstract
This study investigates the effect of delay in compaction on the optimum moisture content and the mechanical propertie s (i.e., compressive strength, ultrasonic pulse velocity, splitting tensile strength, and modulus of elasticity) of roller-compacted concrete pavement (RCCP) made of electric arc furnace (EAF) slag aggregate. EAF slag with size in the range of 4.75–19 mm was used to replace natural coarse aggregate in RCCP mixtures. A new mixing method was proposed for RCCP using EAF slag aggregate. The optimum moisture content of RCCP mixtures in this study was determined by a soil compaction method. The Proctor test assessed the optimum moisture content of mixtures at various time after mixing completion (i.e., 0, 15, 30, 60, and 90 min). Then, the effect of delay in compaction on the mechanical properties of RCCP mixtures at 28 days of age containing EAF slag aggregate was studied. The results presented that the negative effect on water content in the mixture caused by the higher water absorption characteristic of EAF slag was mitigated by the new mixing method. The optimum water content and maximum dry density of RCCP experience almost no effect from the delay in compaction. The compressive strength and splitting tensile strength of RCCP using EAF slag aggregate fulfilled the strength requirements for pavement with 90 min of delay in compaction.
Highlights
Electric arc furnace (EAF) slag is a by-product of steel production, which is generated during the manufacture of crude steel by the electric arc furnace process
Because aggregate in a roller-compacted concrete pavement (RCCP) mixture comprises 75% of its volume, the substitution of traditional natural aggregate by EAF slag aggregate has become important for the development of sustainable infrastructure
RCCP made of 100% EAF slag coarse aggregate (s-RCCP) and a reference RCCP made of 100% natural aggregate (r-RCCP) with 12% cement (Table 4) were subjected to the modified Proctor test
Summary
Electric arc furnace (EAF) slag is a by-product of steel production, which is generated during the manufacture of crude steel by the electric arc furnace process. Faleschini et al [5] showed that high-performance concrete containing 100% EAF slag as the coarse aggregate had mechanical properties better than the reference concrete, including compressive strength, tensile strength, and elastic modulus. Unlike natural aggregate replacement by EAF slag in conventional concrete and high-performance concrete, EAF slag as coarse aggregate substitute caused the decrease of RCCP strength (i.e., compressive strength and splitting tensile strength). The improvement of mechanical properties was observed in the RCCP mixture compacted at the optimized time [9]. Futhermore, the effect of delay in compaction on the optimum moisture content and the mechanical properties of RCCP using EAF slag aggregate was assessed (i.e., compressive strength, ultrasonic pulse velocity, splitting tensile strength, and modulus of elasticity). The time span between mixing and compaction was 0, 15, 30, 60, and 90 min
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