Stress-strain behavior of normal and high strength self-compacting concrete

This paper presents an experimental investigation on stress-strain behavior of normal and high strength self-compacting concrete with two different maximum aggregate sizes. Eight mixes are adopted for this purpose with nominal compressive strength ranging from 20 to 80 MPa and maximum aggregate size of 10 and 20 mm. Results show that the ascending parts of the stress-strain curves become steeper as the compressive strength increases and maximum aggregate size decreases. Strain at failure increases with the increase in compressive strength and maximum aggregate size. Also, changing maximum aggregate size from 10 to 20 mm, generally, increases compressive strength (up to 13.97% for cylinders and 17.24% for cubes) and modulus of elasticity (up to 19.27%).