Effect of Temperature on Thermal Properties of High-Strength Concrete

TLDR

Temperature influences thermal conductivity, thermal expansion, specific heat, and mass loss in high‑strength concrete. The study aims to determine the temperature‑dependent thermal properties of high‑strength concrete for fire‑resistance calculations. Thermal properties of plain and steel‑fiber‑reinforced HSC with siliceous and carbonate aggregates were measured and expressed as temperature‑dependent equations from 0 to 1,000 °C. Aggregate type significantly affects HSC thermal properties, whereas steel fiber reinforcement has minimal impact.

Abstract

For use in fire resistance calculations, the relevant thermal properties of high-strength concrete (HSC) were determined as a function of temperature. These properties included the thermal conductivity, specific heat, thermal expansion, and mass loss of plain and steel fibre-reinforced concrete made of siliceous and carbonate aggregate. The thermal properties are presented in equations that express the values of these properties as a function of temperature in the temperature range between 0 and 1,000°C. The effect of temperature on thermal conductivity, thermal expansion, specific heat, and mass loss of HSC is discussed. Test data indicate that the type of aggregate has a significant influence on the thermal properties of HSC, while the presence of steel fiber reinforcement has very little influence on the thermal properties of HSC.