Characteristics of workability, strength, and ultrasonic pulse velocity of SCC containing zeolite and slag

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.