Measurement of linear thermal expansion coefficient of concrete at high temperatures: A comparison of isothermal and non-isothermal methods

作者：Trnik Anton^*; Medved Igor; Cerny Robert

来源：Cement, Wapno, Beton, 2012, 17(6): 363-+.

A. TRNIK, I. MEDVED%26apos;, R. CERNY MEASUREMENT OF LINEAR THERMAL EXPANSION COEFFICIENT OF CONCRETE AT HIGH TEMPERATURES: A COMPARISON OF ISOTHERMAL AND NON-ISOTHERMAL METHOD Cement-Wapno-Beton, Vol. XVII/LXXIX, 2012, No 6, p. 363 The linear thermal expansion coefficient, alpha(T), of several types of concrete is determined in the temperature range of 20-800 degrees C using two different methods, namely, the isothermal and linear heating methods. The coefficient alpha(T) is in general evaluated as the temperature derivative of the thermal strain which is measured by a push-rod dilatometer. The pros and cons of the two methods are found to be complementary. While in the isothermal heating method sample temperatures are well established, the linear heating method is much less time demanding and provides a large number of experimental data. The latter is important for a proper evaluation of alpha(T) as a derivative of the thermal strain as well as for the ability to observe processes that take place in samples as the temperature is changed.

• 出版日期2012-12