Title:
Toughness, Ductility, Flexural, and Compressive Behavior of Metallic Aggregate Concrete
Author(s):
Ajiboye F. Oluokun and Sary A. Malak
Publication:
Materials Journal
Volume:
96
Issue:
3
Appears on pages(s):
320-330
Keywords:
compressive strength; flexural strength; modulus of elascity; stiffness; stress-strain relationships; toughness
DOI:
10.14359/629
Date:
5/1/1999
Abstract:
The research work reported herein investigated the possibility of initiating and developing new materials that can be used in the production of high-performance concrete (HPC) that maximize strength, increases durability, and is suitable for practical applications. This paper documents the feasibility and the structural benefits of the use of some metallic aggregates in the production of stronger, more durable, and more ductile concrete than that made from conventional stone coarse aggregates. The use of these metallic aggregates in the right proportions may provide the much-needed improvements in concrete structural performance and in the development of mechanical properties without substantially increasing the unit weight of the resulting mix over that of an equivalent conventional aggregate concrete. Tests were performed on 28-day-old specimens to determine compressive strength, the modulus of rupture, the splitting tensile strength, and the general stress-strain behavior of concrete containing metallic aggregates. From the test data for concrete with metallic aggregates, appreciable increases in the measured property parameters were observed at 28 days. In general, and as expected, the ascending portion of the stress-strain curves is steeper for concrete with metallic aggregates compared to those of the control mix. Measured mechanical property increases of up to 37 percent was reported for the compressive strength and up to 37 percent for the modulus of rupture. The stiffness of concrete is also considerably improved by the use of metallic aggregates. The measured increase in the flexural strength varied from 32 to 73 percent, while an increase in toughness of up to 25 percent was observed. Improvements in the measured ductility varied between 21 and 60 percent of the yield deflection, resulting in an increase of up to 47 percent in the ductility ratio.