Estimation of the thermal properties of hardened cement paste on the basis of guarded heat flow meter measurements
2014
Yoon, Seyoon | Macphee, D. E. (Donald E.) | Imbabi, M. S.
In the present study, a new analysis method is proposed to measure thermal conductivity, thermal diffusivity, volumetric specific heat capacity, and specific heat capacity of cement-based materials based on the guarded heat flow meter apparatus. We tested hydrated cement paste specimens with 0.4 water-to-cement ratio and applied both steady and non-steady state data to compute thermal properties of the hydrated cement paste. Thermal conductivity and thermal contact resistance were determined as 1.28Wm⁻¹K⁻¹ and 0.038m⁻²KW⁻¹ using steady state data. Furthermore, using a computerized system of heat flow meters and non-linear regression, we used non-steady state data to measure thermal diffusivity, volumetric specific heat capacity and specific heat capacity of the hydrated cement paste as 4.77×10⁻⁷m²s⁻¹, 2685.4kJm⁻³K⁻¹, and 1.28kJkg⁻¹K⁻¹. The relative uncertainties of these properties fell within 2–7% range and the residual distributions were validated to follow a normal distribution based on quantile–quantile tests.
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