Thermal conductivity against densityHigher and further left: spreads more heat for its weightThermal expansion against thermal conductivityLower and further right: warps less when heated
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Sources9 documents: Indium Corporation, National Ready Mixed Concrete Association, Federal Highway Administration, Oak Ridge National Laboratory, USDA Forest Products Laboratory, MacDermid Alpha, National Institute of Standards and Technology
Concrete
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
Solder SAC305
SAC305 (Sn96.5Ag3.0Cu0.5) solder alloy, bulk; Indium Corporation Indalloy 256 (SAC305) for Preforms product data sheet (Form No. 100346 R0, 2024), selected properties, test temperature not stated; expansion and specific heat from MacDermid Alpha VACULOY SAC TDS (06 September 2023).
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Indalloy 256 (SAC305) for Preforms Product Data Sheet (100346 R0)Indium Corporationarchived copySolder SAC305 · Yield strength: typicalSolder SAC305 · Ultimate tensile strength: typicalSolder SAC305 · Elongation at break: typicalSolder SAC305 · Young's modulus (stiffness): typical, temperature and strain rate not statedSolder SAC305 · Density: typicalSolder SAC305 · Poisson's ratio: typicalSolder SAC305 · Thermal conductivity: typical, temperature not statedSolder SAC305 · Melting point: solidus-liquidus
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CIP 35: Testing Compressive Strength of ConcreteNational Ready Mixed Concrete Associationarchived copyConcrete · Compressive strength: specified compressive strength class (f'c), not a measured typical
CIP 36: Structural Lightweight ConcreteNational Ready Mixed Concrete Associationarchived copyConcrete · Density: range for normalweight concrete
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The Effect of Elevated Temperature on Concrete Materials and Structures: A Literature Review (ORNL/TM-2005/553)Oak Ridge National Laboratoryarchived copyConcrete · Poisson's ratio: general range at normal ambient conditions (overall 0.11-0.32)Concrete · Max service temperature: code long-term temperature limit (ASME Code, concrete containments)
Thermal Coefficient of Portland Cement ConcreteFederal Highway AdministrationConcrete · Thermal expansion: typical range for portland cement concrete (aggregate dependent)
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ALPHA Vaculoy SAC Alloys Technical Data Sheet (2023)MacDermid AlphaSolder SAC305 · Thermal expansion: mean, 20-100 °C (MacDermid Alpha)Solder SAC305 · Specific heat: typical (MacDermid Alpha)
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Best Practice Guidelines for Structural Fire Resistance Design of Concrete and Steel Buildings (TN 1681)National Institute of Standards and Technologyarchived copyConcrete · Specific heat: typical (NIST guidance for thermal analysis)
Each number points to the document that states it, with the exact basis. Values without a number are computed from the sourced ones. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
Questions
Mechanical
Which is lighter, Concrete or Solder SAC305?
Concrete is lighter: 2,320 kg/m³ against 7,350 kg/m³ for Solder SAC305.
Which is stiffer, Concrete or Solder SAC305?
Concrete is stiffer: Young's modulus 25.1 GPa against 6.9 GPa for Solder SAC305, so the same part in Concrete deflects less under the same load.
Which is lighter for the same job, Concrete or Solder SAC305?
For the same stiffness or strength: Concrete is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate.
Part that must be
Concrete
Solder SAC305
Stiff rod or tie (tension)
lighter
11.5x heavier
Stiff beam (bending)
lighter
6.04x heavier
Stiff panel or plate
lighter
4.87x heavier
For the same stiffness or strength, mass scales with density over stiffness (or strength) raised to a power set by how the part is loaded: 1 for a rod in tension, 1/2 for a beam in bending, 1/3 for a panel (the standard material-selection indices).
Thermal
Which conducts heat better, Concrete or Solder SAC305?
Solder SAC305 conducts heat better: 61 W/m·K against 0.9 W/m·K for Concrete.
Which expands less with temperature?
Concrete expands less: 10 µm/m·K against 21.9 µm/m·K for Solder SAC305.