Author: ZHU Bo-fang (China Institute of Water Resources and Hydropower Research, Beijing 100038, China)

Abstract: The adiabatic temperature rise, elastic modulus and strength of concrete are varied with age. There are three formulas for expressing the variations, including the exponential formula, the hyperbolic formula and the double exponential formula. The exponential formula is convenient to mathematical operation but it does not well accord with experimental results, whereas, the second and the third formulas are difficult to mathematical operation though they are well agree with experimental results. A new formula, the compound exponential formula, is proposed in this paper, which is convenient to mathematical operation and well accord with experimental results. The new formula has two merits: firstly, it is convenient to mathematical operation in the process of deriving theoretical solutions for temperature field and thermal stress of concrete structures; secondly, higher precision may be obtained when the thermal stress is computed by the equivalent heat conduction equation of mass concrete.

Key words: Mass concrete; compound exponential formula; adiabatic temperature rise; elastic modulus; strength; age of concrete

Published in: Journal of Hydraulic Engineering, Vol. 42, No. 1, 2011

Article ID: 0559-9350 (2011) 01-0001-07