コンクリート練り混ぜ水の水質規準化に関する実験的研究・その 2 : 水中の不純物が初期収縮及び初期きれつ発生に及ぼす響響

概要

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Tests were made for influences of impurities contained in the mixing water for concreting which are ratural or artificial water on initial shrinkage and initial crack of mortar or concrete. On the basis of the test results, consideration was made to set up a standard for examining mixing water for concreting. Test results are summarized as fallows : (1) Sea water and high concentrated solution of humic acid make initial shrinkage excessively large but the 10, 000ppm solution of sodium chloride does not make it is large. (2) The initial shrinkage of aerated cement is generally small. (3) Initial shrinkage of mortar is severely influenced by the wind. (4) Concrete of high water-cement ratio prepared with aerated cement, river gravel, Pit sand and water contained 5, 000ppm of humic acid is apt to appear initial cracks by the wind.
社団法人日本建築学会の論文
1971-01-30