The Influence of Blast Furnace Slag on Abrasion Resistance for Road Concretes

In this study, the blast furnace slag was used as a mineral addition in the projected road concrete mixtures, and the blast furnace slag in the form of aggregate at 0/4 mm size was used as a percentage of 20%, 40% and 60%. Three concrete slag mixtures were compared with two other concrete mixtures made with conventional materials. Compared to the first conventional mixture, milled slag used as a 15% addition and compared to the second conventional mixture milled slag was used as a substitute for 13% of Portland cement mass. The wear / abrasion resistance was evaluated at the concrete age of 100 days, respectively 150 days. The results indicated the highest wear resistance for the mixture with 20% aggregates crushed from furnace slag, and the mixture with 60% substitution aggregates from furnace slag was observed the lowest resistance. The tendency of evolution of the wear resistance is similar to that of the compressive strength. Mixtures with the highest compression strength also recorded the lowest volume loss after the abrasion test (Bohme). Compared to the first mixture made with conventional materials, the wear resistance obtained in blast furnace slag mixtures is lower. However, mixtures with 13% ground slag and up to 40% of aggregates crushed from blast furnace slag have higher wear resistance compared to the second mixture made with conventional materials.