Development of a New Adiabatic Calorimeter for Quality Control of Cement

Abstract

As the use of industrial waste as a raw material for the production of cement is expanded, it will become increasingly important to control the adiabatic temperature rise of cement. The evaluation of adiabatic temperature rise in concrete is not adequate for daily quality control because it requires considerable labor. In order to establish a convenient method for evaluating adiabatic temperature rise using only about 30ml of mortar sample, we produced an experimental adiabatic calorimeter. This paper investigates the accuracy and the applicability of this equipment. In addition, the adiabatic temperature rises of cement samples with different C 3 A content were investigated for future utilization of industrial waste. Values of adiabatic temperature rise measured using this equipment were found to correspond to those obtained using existing equipment, with correction for the heat capacity of the sample container. Clear differences in adiabatic temperature rise were observed among mortar samples with different blending conditions. Changes in adiabatic temperature rise were negligible even when the aluminate phase content of the studied cement was increased from 9 mass% to 12 mass%. These results suggest that quality control of cement and preparatory experiments could be practiced reasonably by using this adiabatic calorimeter.

Standard Gibbs Energies of Formation of the Ferro- and Paramagnetic Phases of AlNd3

“…Five measurements were carried out, and their average was adopted as the result. The experimental procedure to measure Δ sol H 298 by using a Calvet-type acid solution calorimeter , was described in our previous study, and its detail is abbreviated in the present study.…”