Abstract:
In order to investigate the response of hardened concrete structures to thermal loads,
specific heat capacity and thermal conductivity of hardened concrete and heat transfer
coefficients between concrete and different formwork materials were investigated. Specific
heat capacity and thermal conductivity values were determined by using an innovative
transient measuring technique based upon linear heat source theory. Tests were conducted
experimental setup developed and values were derived based on simplified theory of the
linear heat source developed by Carslaw and Jaeger. Specific heat capacity values were
evaluated against mix proportion of concrete and thermal conductivity values were
determined with the age of selected mixes. Heat transfer coefficients were determined by
simulating the temperature results obtained from experimental investigation with finite
element modelling using ANSYS software. It was found that specific heat capacity of
concrete increases with water/cement ratio and aggregate volume percentage in the mix.
Thermal conductivity of concrete was found to be decreasing first few days and thereafter
increasing to a constant value. A method to determine the heat transfer coefficient between concrete and different formwork types under various environmental conditions was developed.
