Mechanisms and parameters controlling the tricalcium aluminate reactivity in the presence of gypsum
Mechanisms and parameters controlling the tricalcium aluminate reactivity in the presence of gypsum
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DOI：
10.1016/j.cemconres.2007.06.001
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发表时间：
2007-10-01
影响因子：
11.4
通讯作者：
Nonat, Andre
中科院分区：
文献类型：
--
作者：
Minard, Hne;Garrault, Sandrine;Nonat, Andre
为了了解早期石膏存在下铝酸三钙体系的反应机理和控制参数，用等温微量热法、电导法和不同石膏用量对“C(3)A-硫酸盐”体系的水化进行了研究，并监测了稀释体系悬浮液的离子浓度。还研究了C(3)A源的作用及其细度。这项工作表明，在硫酸盐被消耗的过程中，AFM相的快速初始形成，随后钙矾石的形成。有人强调，消耗所有石膏所需的时间因C(3)A的类型而异，这归因于每种石膏的内在反应性，主要是由于细度从一种C(3)A变为另一种C(3)A。结果与文献中的假设一起讨论，以解释在硫酸钙存在下C(3)A水化过程的减慢。(C)2007爱思唯尔有限公司。保留所有权利。
To understand the mechanisms and the parameters controlling the reactivity of tricalcium aluminate in the presence of gypsum at an early age, a study of the hydration of the "C(3)A-sulphate" system by isothermal microcalorimetry, conductimetry and a monitoring of the ionic concentrations of diluted system suspensions have been carried out with various gypsum quantities. The role of C(3)A source and its fineness were also studied. This work shows the fast initial formation of AFm phase followed by ettringite formation during the period when the sulphate is consumed. It has been highlighted that the time necessary to consume all the gypsum varies with the type of C(3)A and it has been attributed to the intrinsic reactivity of each one and mainly to the change of fineness from one C(3)A to another. Results are discussed alongside hypothesis from the literature to explain the slowing down of C(3)A hydration process in the presence of calcium sulphate. (C) 2007 Elsevier Ltd. All rights reserved.