200GPasourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018)
Density
2,240–2,400kg/m³sourcerange for normalweight concrete
7,861kg/m³sourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018)
Strength to weight
not sourced
47.3kN·m/kg
Stiffness to weight
not sourced
25.4MN·m/kg
Poisson's ratio
0.15–0.2sourcegeneral range at normal ambient conditions (overall 0.11-0.32)
0.32sourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018)
51.9W/m·Ksourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018)
Thermal expansion
8–12µm/m·Ksourcetypical range for portland cement concrete (aggregate dependent)
12µm/m·Ksourcebase material: unalloyed carbon steel, Ovako family table (S275JR, 'none alloyed structural steels', C <= 0.21%); mean 20-300 °C
100 mm part over a 50 °C swing
50µm growth20% less
60µm growth
Specific heat
900J/kg·Ksourcetypical (NIST guidance for thermal analysis)
486J/kg·Ksourcebase material: AISI 1025 plain carbon steel (MIL-HDBK-5J design value; ASTM A108 bar is the cold-finished carbon-steel bar spec that also covers 1018)
Heats up and cools (diffusivity)
0.431mm²/s
13.6mm²/s31.5x faster
Thermal shock resistance
not sourced
5,473W/m
Max service temperature
65°Csourcecode long-term temperature limit (ASME Code, concrete containments)
not sourced
Values for
Normal-weight portland cement concrete, strength class f'c = 4000 psi (28 MPa) per NRMCA CIP 35; density NRMCA CIP 36; thermal conductivity USDA FPL Wood Handbook; service temperature ORNL/NRC review
AISI 1018 cold drawn bar (Niagara LaSalle, cold-finished bar producer)
Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Questions
Which is lighter, Concrete or Steel AISI 1018?
Concrete is lighter: 2,320 kg/m³ against 7,861 kg/m³ for Steel AISI 1018.
Which conducts heat better, Concrete or Steel AISI 1018?
Steel AISI 1018 conducts heat better: 51.9 W/m·K against 0.9 W/m·K for Concrete.
Which expands less with temperature?
Concrete expands less: 10 µm/m·K against 12 µm/m·K for Steel AISI 1018.