Retour au sommaire

Etalonnage des caissons QAB

ANDRE, Jean Luc¹ ; SAINTILAN, Richard²

1. LR Saint-Brieuc
2. LR Saint-Brieuc

Résumé :

Test principle : Executing the quasi-adiabatic test on concrete (called the QAB test) requires accurate knowledge of both the total heat loss coefficient ñ and heat capacity ¬ of the calorimeters introduced, with these two parameters capable of being determined by calibration. This method, adapted from Standard NF EN 196-9 (entitled "Cement test methods Part 9 : Hydration heat The semi-adiabatic method"), consists of replacing the test sample inside the calorimeter to be calibrated with a same-sized calibration cylinder equipped with an electrical resistance. By applying a known potential difference to this resistance so as to trigger a temperature rise, the amount of applied electrical energy corresponds to both the temperature rise taking place in the calorimeter and the heat dissipated towards the atmosphere. Heat loss can then be calculated based on the electrical energy required to maintain constant temperature. As a next step, the heat capacity is determined by measuring the rate at which temperature is decreasing inside the calorimeter once the electrical source has been disconnected.

Mots clés :

METROLOGIE ; METHODE DE MESURE ; CHALEUR ; BETON

Bulletin des Laboratoires des Ponts et Chaussées n°278, 2010, pp 43-47

Retour au sommaire