The Effects of the Addition of Light Burnt Magnesia on the Properties of Cements

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  • 各種セメントの性能に及ぼす軽焼マグネシアの影響
  • カクシュ セメント ノ セイノウ ニ オヨボス カルヤキ マグネシア ノ エイキョウ

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A study was carried out to know the influences of additional light burnt magnesia on several properties of portland cement, blast furnace portland cement and sulfated slag cement.<br>In portland and blast furnace cements, the addition of light burnt magnesia retards the setting time slightly, decreases the fluidity and the strength, increases the expansion due to hydration, and decreases the drying shrinkage to some extent.<br>In sulfated slag cement, light burnt magnesia added as an alkaline exciter gave the properties of low fluidity, low initial strength and very low heat of hydration, and somewhat higher shrinkage. Additional portland cement clinker gave the high fluidity and the high initial strength. Higher the amount of clinker, shorter the setting time, but too much addition of clinker decreases the strength. Expansions through autoclave test as well as during hydration were markedly increased by an interaction between magnesia and clinker, and drying shrinkage was also increased particulary by an excessive addition of light burnt magnesia.

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