The Advantages on Using GGBS and ACBFS Aggregate to Obtain an Ecological Road Concrete

This work aims to show the advantages of using GGBS (Ground Granulated Blast Furnace Slag) and ACBFS aggregate (Air-Cooled on tensile strength durability properties infrastructure concrete at reference age 28 days. Three mixes were prepared: first one was a control sample; second had 15% (instead Portland cement) 25% natural sand); third 50% sand). The studies mortars focused ratio compressive (CS) in correlation with specific surface area (obtained by Blain method). microstructure prepared examined days X-ray diffraction, SEM electron microscopy an energy-dispersive EDX spectrometer, NMR nuclear magnetic resonance relaxometry. results tests carried out afterwards concretes containing slag (15% or ACBFS) showed values that met high-quality criteria for exfoliation (S56 < 0.1 kg/m2), carbonation, gelling G100 (with loss resistance compression η 25%). degree gelation below 25%), low volume losses 18,000 mm3/5000 mm2 (corresponding wear class 4, grade I), moderate penetration chlorine ions (according RCPT test). All these allow (GGBS/ACBFS) be recommended as ecological road concrete. Our study proved high-class BcR 5.0 can obtained, strengths minimum 5 MPa (the higher Romania, according national standards).