報告書番号

U93043

タイトル（和文）

コンクリートのクリープ予測式における瞬間ひずみ成分の決定－任意の配合・材令におけるセメントペーストの静弾性定数の予測－

タイトル（英文）

DETERMINATION OF INSTANTANEOUS STRAIN COMPONENTS IN CREEP PREDICTION EXPRESSION -PREDICTION OF STATIC ELASTIC CONSTANTS OF CEMENT PASTE-

概要 （図表や脚注は「報告書全文」に掲載しております）

Ｗ／Ｃ＝０．２５から０．０５おきに、０．５５までの７種類の配合の中庸熱ポルトランド・セメント・ペーストｐｈｉ５＊１０ｃｍ供試体各９本について、Ｐ波とＳ波の伝播速度（Ｖｐ２Ｖｓ）を３日から２年にわたる種々の材令において測定した。このデータに、既に導いた水和を考慮した水分と空気を含んだセメント・ペースト内の超音波伝播速度を表す理論式をあてはめ、任意の配合と材令において、ＶｐとＶｓを求める式を得た。これらから得られる動弾性係数と動ポアソン比と、既に得たこれらから静弾性係数と静ポアソン比を求める式を用いて、任意の配合と材令における中庸熱ポルトランド・セメント・ペーストの静弾性係数と静ポアソン比を求める式を得た。種々のＷ／Ｃと材令において、これらの数値を具体的に計算し、データ・ベース用に表で示した。

概要 （英文）

THE LAST PAPER PRESENTED EXPERIMENTAL EXPRESSIONS TO DETERMINE THE STATIC YOUNG S MODULUS AND STATIC POISSON S RATIO OF CEMENT PASTE FROM THE PULSE YOUNG S MODULUS AND PULSE POISSON S RATIO CALCULATED FROM P-AND S-WAVE VELOCITIES IN VARIOUS CEMENT PASTES ATVARIOUS AGES. THIS WAS THE SECOND STEP IN OBTAINING THE INSTANTANEOUS ELASTIC STRAIN COMPONENTS SEKI ET AL. AND THE PRESENT AUTHOR S CREEP PREDICTION FORMULA FOR CONCRETE. THIS PAPER PRESENTS THE FOLLOWING RESULTS. CEMENT PASTE SPECIMENS WE RE MADE WITH WATER CONTENTS OF 0.25, 0.30,0.35, 0.40, 0.45, 0.50 AND 0.55 USING MODERATE-HEAT PORTLAND CEMENT CURED IN WATER. THEIR P-AND S-WAVE VELOCITIES WERE MEASURED AT AGES OF 7,14,28,91 DAYS, 6 MONTHS, 1 YEAR, AND 2 YEARS.ONE AVERAGE VALUE WAS CALCULATED FROM THE DATA OF 9 SPECIMENS. EACH OF THE P-AND S-WAVE VELOCITIES WAS EXPRESSED AS A LINEAR FUNCTION OF THE UNBOUND WATER CONTENT AND AIR CONTENT. THESE CONTENTS WERE CALCULATED FROM THE EXPRESSION OF CEMENT HYDRATION OR ANY WARERCARENR AND AGE DERIVED BY SEKI ET AL.AND THE PRESENT AUTHOR. THE P-AND S-WAVE VELOCITIES IN CEMENT PASTE AT ANY WARERECARENR AT ANY AGE WERE CALCULATED TO OBTAIN THE PULSE YOUNG S MODULUS AND PULSE POISSON S RATIO. SINCE THE RELATIONSHIP BETWEEN THE PULSE AND STATIC YOUNG S MODULI AND THE RELATIONSHIP BETWEEN THE PULSE AND STATICPOISSON S RATIOS HAVE BEEN OBTAINED BY THE AUTHOR, THE VALUES OF THE STATIC YOUNG S MODULUS AND STATIC POISSON S RATIO FOR MODERATE-HEAT PORTLAND CEMENT PASTE CURED IN WATER OR ANY WATERCANRENR AND AGE WERE CALCULATED AT AGES BETWEEN 3 AND 805 DAYS. THE RESULTS ARE PRESENTED.

報告者

キーワード