英语词汇“portlandite”的英英意思、用法、释义、翻译、读音、例句、短语、词组、英语词典-本地帮

单词

portlandite

释义

portlandite Min.|ˈpɔətləndaɪt|
[f. Portland¹ (see quot. 1933) + -ite¹.]
A form of calcium hydroxide that occurs naturally as minute hexagonal colourless plates and is a common product of the hydration of Portland cement.
1933C. E. Tilley in Mineral. Mag. XXIII. 420 The occurrence of Ca(OH)₂ as a well-defined species is the contact-zone of Scawt Hill [Co. Antrim] merits a new mineral name, and in view of its occurrence as a common product of hydration of Portland cement, and furthermore as crystals from this source have provided the first reliable physical and optical data on crystalline Ca(OH)₂, it is fitting that the mineral name should bear record of these facts. The name Portlandite is accordingly proposed.1968I. Kostov Mineral. 221 Periclase group... The calcium members are rare minerals: portlandite occurs in metasomatic deposits in limestones.1977Sci. Amer. Aug. 84 In a hardened cement this gel..occupies about 70 percent by volume of the hydrated material... The major part of the other crystalline products consists of calcium hydroxide (portlandite).

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