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Effect of cooling rate and Na2O content on the character of the interstitial materials in portland cement clinker

โœ Scribed by M. Ichikawa; S. Ikeda; Y. Komukai

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
258 KB
Volume
24
Category
Article
ISSN
0008-8846

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โœฆ Synopsis

Both the chemical and phase compositions of the crystalline interstitial phases in clinker vary significantly depending on the cooling rate and NaaO content of clinker. In slowly cooled clinker the calcium aluminoferrite phase is definitely lower in amount and Al~Oa/Fe~Oa ratio than in rapidly cooled clinker. The coexistence of Na20 encourages this change. With slow cooling, SlOe and MgO in the ferrite phase decrease in content with an increase in the ratio of SiOa to MgO due to the precipitation of periclase. In the calcium aluminate phase MgO decreases as well; but SiO~, in the coexistence with Na~O, remains high even on slow cooling because of the coupled ion exchange Ca ~' + AI 3~ ,~ Na ~ + Si 4', which causes the crystal system to change from cubic to orthorhombic. * The d-spacings correspond to those of the ferrites in clikers A1, A2 and B.

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