報告書番号

384021

タイトル（和文）

ローラーコンパクテッドコンクリートのマスコンクリート構造物への適用－その２石炭灰等の有効利用方法の検討－

タイトル（英文）

STUDY ON THE APPLICATION OF ROLLER COMPACTEDCONCRETE METHOD TO THE ELECTRIC POWER RELATED MASS CONCRETE STRUCTURES(2) -STUDY ON THE EFFECTIVE USE OF INDUSTRIAL BY-PRODUCTS SUCH AS COALASH-

概要 （図表や脚注は「報告書全文」に掲載しております）

ローラーコンパクテッドコンクリート（ＲＣＣ）工法は，重力ダムの内部コンクリートへの適用を主たる目的として開発が進められ，ＲＣＤ工法として定着をみているが，その配合については限られた範囲でのみ検討がなされてきた。一方，１９９０年には，約５００万ｔの副産が見込まれる石炭灰の有効利用の一環として，建設材料にこれを積極的に活用する道を拓くことは電気事業に課せられた重要な検討課題である。本研究は，ダム等の水工施設，火力・原子力発電所の基礎コンクリート，人工岩盤等へのＲＣＣ工法の適用を目指し，とくにフライアッシュ等の石炭灰の大量有効利用につながる対策に関し，コンクリートの配合の面から実験的な検討を行なったものである。その結果，石炭灰，高炉スラグ等の産業副産物をＲＣＣに大量に利用できる見通しが明らかにされ，材料面からの建設費削減の可能性を示した。

概要 （英文）

IN VIEW OF THE SUCCESSFUL APPLICATION OF ROLLER COMPACTED DAM(RCD) CONCRETE UNDER THE SUPERVISION OF THE MINISTRY OF CONSTRUCTION IN JAPAN,THE CONSTRUCTION METHOD IS BEING WATCHED WITH KEEN INTEREST AS ONE OF THE PROSPECTIVE MEANS TO REDUCE THE CONSTRUCTIONCOST OF ELECTRIC ENERGY RELATED MASS CONCRETE STRUCTURES.THE PURPOSE OF THE STUDY IS TO INVESTIGATE THE POSSIBILITY OF INCREASING THE FLY ASHCONTENT THAN THOSE HAVING BEEN USED FOR ROLLER COMPACTED DAM CONCRETE(RCD) IN JAPAN. EXPERIMENTAL SELECTIONS OF OPTIMUM PROPORTIONS WERE CONDUCTED BASED ON THE BASIC PROPORTION PREVIOUSLY OBTAINED;SAND/AGGREGATE RATIO 32%,UNIT WATER CONTENT 100KG/CUBIC METER,UNIT BINDER CONTENT 120KG/CUBIC METER,F/(C+F)=30%,AND MAXIMUM SIZE OF COARSE AGGREGATE 80MM. WITHIN THE LIMIT OF THE EXPREIMENT FOLLOWING CONCLUSIONS COULD BE OBTAINED. (1)FROM THE EXPERIMENTS,IN WHICH A PART OF BINDER CONTENT WAS REPLACED BY FLY ASH KEEPING THE TOTAL UNIT BINDER CONTENT CONSTANT,(C+F=120KG/CUBIC METER)IT WAS FOUND THAT THE REPLACEMENT RATIO CAN BE INCREASED UP TO 45% FROM THE CONVENTIONAL VALUE OF 30% WHEN THE DESIGN STRENGTH OFCONCRETE IS REQIRED TO SATISFY THE VALUE OF 80KG/SQUARE CENTIMETER.FOROTHER PUROSES SUCH AS MAN-MADE ROCKS,FOUNDATION OF DAMS ETC.EVEN HIGHER REPLACEMENT RATIOS(UP TO 60%),MAY BE ALLOWED. (2)THE OPTIMUM REPLACEMENT RATIO OF FLY ASH SATISFYING THE STRENGTH REQUIREMENT OF 80KG/SQUARECENTIMETER AT THE AGE OF 91 DAYS WERE ESTIMATED AS 30% AND 15%,CORRESPONDING TO THE TOTAL UNIT BINDER CONTENT OF 100 AND 80KG/CUBIC METER,RESPECTIVELY. (3)WHEN THE SUM OF CEMENT AND SLAG CONTENT WAS SET TO BE 120KG/CUBIC METER,REPLACEMENT RATIO OF 65% WAS FOUND TO BE FEASIBLE IN TERMS OF STRENGTH DEVELOPMENT AT 91 DAYS.

報告者

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