The effects of curing conditions and expanded perlite aggregate (EPA) on the high strength concrete (HSC) properties were studied at 28 days. Time depended dry and wet curing effects on the thermal conductivity (TC) were compared. Five different concrete mix designs with the same mix proportions and different EPA replacements of aggregate were used: 0% (control), 7.5%, 15%, 22.5% and 30% EPA. The effects of EPA replacement and curing conditions upon concrete properties were examined. The properties examined included compressive strength (CS), TC, ultrasound pulse velocity (UPV) and oven dry density (ODD) properties of HSC containing EPA. CS, TC, UPV and ODD of HSC were decreased with increasing of EPA. Dry curing reduced the CS compared to the wet curing condition in this study.