コンクリートの耐凍害性におよぼす脱型までの取り扱いの影響

概要

論文の詳細を見る
Influence of the treatment of concrete at an early period on frost damage after hardening was studied by changing the conditions of specimens, while they were in the mold. Freezing and thawing tests of (A) method designated in ASTM C 666 were carried out after curing in water in the same conditions as those of the various conditions in the mold. The sealing condition of the exposed of concrete, temperature and humidity of the surroundings, time of the removal from the mold and the surface period of leaving specimens in air after removal were varied as test conditions of treatment of specimens. Test results are summarized as follows. 1) Althougth freezing and thawing tests were carried out after about 2 weeks of water curing, a fairly large difference in frost resistance was recognized between the concretes sealed with a vinyl sheet and those left with the surface exposed. 2) The difference in frost resistance of concrete caused by early treatment resulted mainly from the degree of saturation just before the freezing and thawing test. 3) As a condition of the standard test, the surface of the concretes should be sealed carefully, while they are in the mold. Curing in water for a long period may reduce the influence of the conditions at an early period.
社団法人日本建築学会の論文
1986-09-30