報告書番号

385018

タイトル（和文）

オートクレーブ促進試験法によるアルカリ骨材反応の早期判定に関する検討

タイトル（英文）

STUDY ON RAPID ESTIMATION OF ALKALI AGGREGATE REACTION BY THE AUTOCLAVE ACCELERATED TEST METHOD

概要 （図表や脚注は「報告書全文」に掲載しております）

１）「セメント骨材比１０：１，Ｗ／Ｃ０．３０」の実験条件によるとＡＣ促進試験後の膨張性状はＡＳＴＭ規準の岩石学的および化学方法による試験で「有害な反応を起す可能性がある」と判定された骨材試料は膨張量が大きく反応性および非反応性骨材試料を区別することが十分可能であった。２）ＡＣ促進試験の測定精度は変動係数および分散でそれぞれ１１．９％および１．７６×１０の－４乗程度で比較的精度よく測定できると判断された。

概要 （英文）

THE EXPERIMENTAL STUDY WAS PERFORMED IN ORDER TO DEVELOP THE RAPID ESTIMATION METHOD OF ALKALI AGGREGATE REACTION (A.A.R), IN WHICH THE TEST RESULTS OBTAINED BY THE ACCELERATED METHOD USING A UTOCLAVE CURING WERE COMPARED WITH THOSE JUDGED BY THE ASTM STANDARD. MAIN CONCLUSIONS OBTAINED BY THE STUDY WERE AS FOLLOWS. (1) IT TAKES FOUR DAYS TO OBTAIN THE JUDGEMENT OF A.A.R OF THE AGGREGATES BY MEANS OF THE AUTOCLAVE CURING METHOD. (2) THE VOLUME CHANGES OF CONCRETE INCLUDING THE REACTIVE AGGREGATES DEPEND ON THE QUANTITY OF ALL ALKALIS IN THE MORTAR. (3) IN THE CASES THAT THE QUANTITY OF ALKALIS IN CEMENT EQUIVALENT TO SODIUM OXIDE IS MORE THAN 0.5%, THE VOLUME OF EXPANSION OFCONCRETE SPECIMEN INCLUDING THE REACTIVE AGGREGATES AFTER AUTOCLAVE CURING IS IN PROPORTION TO THE QUANTITY OF ALL ALKALIS. (4) IT WAS CONFIRMED THAT THE ACCELERATED METHOD USING AUTOCLAVE CURING COULD BE USED TOJUDGE THE REACTIVITY OF AGGREGATES AND THAT MIGHT BE THE PROMISING METHOD AS A RAPID ESTIMATION ONE OF A.A.R.

報告者

キーワード