Characterization of Fly Ash and its Reactions in Concrete
Characterization of Fly Ash and its Reactions in Concrete
复制标题
粉煤灰的表征及其在混凝土中的反应
DOI：
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发表时间：
1984
期刊：
影响因子：
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通讯作者：
S. Diamond
中科院分区：
文献类型：
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作者：
D. Roy;K. Luke;S. Diamond
由于低级次烟煤和褐煤的广泛使用，目前生产的飞灰在成分和其他特性方面比以前有更大的差异。目前 ASTM 将火山灰分类为 F 级和 C 级不足以描述其所有重要特性。综述了目前的表征方法，包括粒度分布、形状、表观比重、空心颗粒和残煤碎片含量等物理表征，各种化学方法，以及SEM、EDXA、XRD等测定矿物含量和玻璃特性的方法。蚀刻和化学溶解程序尤其重要。讨论了这些不同方法的状态、它们在粉煤灰表征中的应用的当前结果，以及这些方法与水泥和混凝土中粉煤灰的反应性和性能的关系。
Fly ashes are currently being produced that are much more widely different from each other in composition and other characteristics than had been previously experienced, owing to the widespread use of low rank subbituminous and lignitic coals. The current ASTM classifications into Class F and Class C pozzolan categories are not adequate to describe all their important properties. Current characterization methods are reviewed, including physical characterization by particle size distribution, shape, apparent specific gravity, content of hollow grains and of residual coal fragments, etc., chemical procedures of various kinds, and SEM, EDXA, XRD, and other methods for the determination of mineralogical content and glass character. Etching and chemical dissolution procedures are particularly important. The state of these various methods, current results of their use in rly ash characterizations, and the relations of these to reactivity and performance of fly ashes in cement and concrete are discussed.