WATER-SOLUBLE ALKALI CONTENT IN CEMENT

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  • セメント中の水溶性アルカリ量
  • セメントチュウ ノ スイヨウセイ アルカリリョウ

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The method for analysis of acid-soluble alkali content, standardized in JIS R 5202, is conventionally utilized when alkali content in cement has to be determined. However it is the alkali in pore solution of concrete or the water-soluble alkali in cement that influences the properties of concrete. Acid-soluble and water-soluble alkali contents were determined for 36 brands of ordinary portland cement and it was found that there was little correlation between water-soluble and acid-soluble alkali content in cement. Analysis of pore solution extracted from cement paste and mortar samples shows that the alkali content is closely related to the water-soluble alkali rather than the acid-soluble alkali. It can thus be concluded that a knowledge of water-soluble alkali content in cement is essential when experiments such as mortar-bar or concrete-bar tests to study the possibility of alkali aggregate reaction are carried out.

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