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首页> 外文会议>Proceedings Fourth Canada Centre for Mineral and Energy Technology / American Concrete Institute / Japan Concrete Institute International Conference on Recent Advances in Concrete Technology Tokushima, Japan, in June 1998 >Determination of the Apparent Activation Energy of Concrete: Ea. Semi-Adiabatic tests of Heat Development
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Determination of the Apparent Activation Energy of Concrete: Ea. Semi-Adiabatic tests of Heat Development

机译：混凝土表观活化能的测定：Ea。热量产生的半绝热试验

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The method of equivalent age is one of the currently used non-destructive testing mehtods of concrete strength estiamtion. It is based on the Arrhenius' law, which has shown itself to be the most accurate in order to describe the influence of temperature on concrete strength development at early ages. A proper estimation is directly related to a correct determination of the Apparent Activation Energy : Ea. This is the unique parameter which characterizes the concrete mixture and which can be found in the Arrhenius' law. the major aim of this paper is to show how calorimetric tests under semiadiabatic conditions can be an alternative to unwieldy compressive tests procedures in order to determine Ea. The validity of the obtained Ea values has been verified by means of several mechanical tests. Moreover, the possibility of using iether mortar or concrete is partially dealt with. the water to cement ratio appears to naturally be considered as a constant in proportioning an equivalent mortar. Finally, the evolution of hte Apparent Activation Energy in relation to the degree of hydration is given .Hence, the widespread opinion that Ea depends on the degree of hydration is confirmed and a field of definition can be brought to the fore.
机译：等效年龄法是目前使用的混凝土强度估算的无损检测方法之一。它基于阿伦尼乌斯定律，该定律已证明是最准确的，可以描述温度对早期混凝土强度发展的影响。正确的估计与表观活化能Ea的正确确定直接相关。这是表征混凝土混合料的唯一参数，可以在阿伦尼乌斯定律中找到。本文的主要目的是说明如何在半绝热条件下进行量热测试，以替代笨重的压缩测试程序来确定Ea。所获得的Ea值的有效性已通过多种机械测试得到了验证。此外，部分解决了使用醚灰浆或混凝土的可能性。水灰比似乎很自然地认为是当量砂浆的一个常数。最后，给出了表观活化能随水合度的变化规律。因此，人们普遍认为Ea取决于水合度，可以将其定义的领域引人关注。

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