Assessment of Uncertainties in Calibration of Langavant Calorimeters

Autor: Jacques Hameury, Bruno Hay, Guillaume Davee, Marc Grelard
Rok vydání: 2013
Předmět:
Zdroj: International Journal of Thermophysics. 35:1757-1769
ISSN: 1572-9567
0195-928X
Popis: The semi-adiabatic method, commonly referred to as the Langavant method, is widely applied for routine measurements of the hydration heat of cements. This standardized method is applicable to all cements and hydraulic binders, whatever their chemical composition, with the exception of quick-setting cements. The calorimeters used to perform these hydration heat measurements must be previously calibrated by electrical substitution, in order to determine their coefficient of total heat loss $$\alpha $$ and their heat capacity $$\mu $$ . LNE developed a facility enabling performance of the calibration of these Langavant calorimeters, in order to insure the traceability of the hydration heat measurements to basic quantities such as temperature, time, mass, and electrical quantities. Calibration results of a typical Langavant calorimeter are presented here. The measurement uncertainties of the parameters $$\alpha $$ and $$\mu $$ have been assessed according to the ISO/BIPM “Guide to the Expression of Uncertainty in Measurement.” The relative expanded uncertainties ( $$k = 2$$ ) of the coefficient of total heat loss $$\alpha $$ and the heat capacity $$\mu $$ are estimated, respectively, to be about 0.7 % and 15 %.
Databáze: OpenAIRE
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