绝热过程
阿累尼乌斯方程
活化能
水泥
材料科学
热力学
抗压强度
无水的
动能
学位(音乐)
机械
复合材料
化学
物理化学
物理
声学
有机化学
量子力学
作者
L. D’Aloia,Gilles Chanvillard
标识
DOI:10.1016/s0008-8846(02)00791-3
摘要
The "apparent activation energy" of concrete—Ea—is usually determined by means of mechanical or calorimetric tests. This parameter, which characterises the sensitivity of concrete hydration processes to temperature, is required for estimating the compressive strength of concrete at early age by the "method of equivalent age." The major aim of this paper is to show how numerical simulations of released heat under adiabatic conditions could be an alternative to experiments for determining Ea. The simulation model—the CHAL program—which is developed here, is based on the kinetic model of Avrami–Erofeev. The coupling by temperature between the different chemical reactions of the main anhydrous components of cement is taken into account by using the Arrhenius' law. The model leads to a better understanding of the polymineral characteristic of cement as regards heat of hydration and Ea determination. The "apparent" nature of Ea and its dependence on hydration degree can be underlined.
科研通智能强力驱动
Strongly Powered by AbleSci AI