Abstract

This paper reports the results of the study conducted to evaluate the influence of natural zeolite (NZ) and blast furnace slag (BFS) and both NZ + BFS on the ultrasonic pulse velocity (UPV), compressive strength, flexure strength and density of self-compacting concrete (SCC). In addition, the relationship between UPV and compressive strength was evaluated. NZ, BFS and both NZ+BFS were used as the mineral admixtures in replacement of Portland cement. It was possible to produce SCC using 10%NZ, 10%, 20%, 30% BFS and 10% NZ+20% BFS with a slump flow in the range of 500 to 700 mm. Compressive strength, flexure strength and UPV were determined at 3, 7, 28 and 90-day. Finally, it was observed that the specimens (with 10% BFS) for 90-day had the highest compressive strength and UPV. It was observed that the specimens (with 20% BFS) for 90-day had the highest flexure strength. The relationship between UPV and compressive strength was exponential for NZ, BFS and NZ+BFS. The relationship between flexure strength and compressive strength was logarithmic for NZ, BFS and NZ+BFS. However, the constants in the models were different for each mineral admixture and each level replacement of PC.

Key words: Self-compacting concrete, ultrasonic pulse velocity, strength, natural zeolite, blast furnace slag.