MECHANICAL-PROPERTIES OF HIGH-STRENGTH LIGHTWEIGHT CONCRETE

Presents information on the mechanical properties of high-strength lightweight concrete up to 100 MPa with a corresponding density of 1865 kg/m3. Five different types of lightweight aggregates were investigated, and the strength of the aggregate appears to be the primary factor controlling the strength of the high-strength lightweight concrete. The tensile/compressive strength ratio appears to be lower for high-strength lightweight concrete than that for high-strength normal weight concrete, and the elastic modulus, which varied from 17.8 to 25.9 GPa, is much lower than that of normal weight concrete. The ultimate strain at peak load for the concrete varied from 3.3 to 4.6 mm/mm, which is higher than that of normal weight concrete. For the high-strength lightweight concrete, the shape of the ascending part of the stress-strain curve was more linear than that of lightweight concrete with low to medium strength.