Akademik Veri Yönetim Sistemi
Construction and Building Materials, cilt.471, 2025 (SCI-Expanded)
The growing demand for materials in road construction has increased the need for aggregates. This study investigates the engineering properties of a steel slag-subgrade-geogrid composite structure to assess its potential for effective use in base and/or subbase layers. To this end, laboratory test programs were designed to develop a reliable methodology for estimating the resilient modulus (MR) values of steel slags used in road construction. The laboratory program included repeated load triaxial (RLT) tests and physical characterization of the samples. Additionally, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were employed for material analysis. Due to the need to characterize the cyclic load-deformation behavior of geogrid-stabilized slags under vehicular traffic conditions, large-scale triaxial test rigs are often required. Therefore, in this study, the AASHTO T307 protocol was used to determine the resilient modulus using a triaxial tester with a diameter of 152.5 mm (6 in) and a height of 305 mm (12 in). An extended test of 10.000 cycles was also conducted to examine changes in MR and permanent deformation over the load cycles. The results showed that the inclusion of the geogrid increased the maximum MR by 26 % in the ACBF mix and by 29 % in the EAF50 +ACBF50 mix. The observed differences in the effect of the geogrid on the two types of slag (EAF and ACBF) can be attributed to variations in grain size, as confirmed by the test results. Specifically, for the ACBF slag, geogrid reinforcement reduced permanent deformation by 50 % compared to the unreinforced section. Additionally, permanent deformation in the EAF mix was reduced by 25 % with the addition of geogrid reinforcement.