再生混凝土之製造及性質研究

Abstract

摘要 本文利用實驗室內抗壓試驗後的圓柱試體,強度由2000psi 至5000psi,經加以碎化充當再生粗骨材,進行配比設計及再生混凝土的製 造.然後測試再生之新拌混凝 土性質及硬固混凝土各項工程及力學性質, 並與相同配比下的普通混凝土比較之. 試驗結果顯示, 由廢棄混凝土 碎化後所得之再生粗骨材,其粒形及各項物理性質都能達到一般混凝土骨 材的基本要求.以適當級配的再生骨材也能順利的拌製成合宜的混凝土.對 水灰比介於0.5至0.7的再生混凝土,進行各項工程及力學性質測析後發現, 雖然其性質較控制組的普通混凝土差,但差距有限,因此可推論出,採用再 生粗骨材拌製混凝土有相當的可行性.

Abstract The use of recycled coarse aggregates in processing mix design and production of recycled aggregate concrete were prepared by the crushing of tested concrete cylinders of compressivestrength from 2000psi to 5000psi in the laboratory. Then,we test the properties of fresh recycled aggregate concrete and physical and mechanical properties of harden concrete in contrastto natural aggregate concrete in the same mix proportion. The test results showed,the shape and physical properties of recycled coarse aggregates can reach the basic requirement of normal concrete coarse aggregates after the crushing. Proper grading recycled aggregate can produce reasonable concrete smoothly.After processingtesrs of variant physical and mechanical properties of recycled aggregate concretewhich water-cement ratio from 0.5 to 0.7,it was found that although its properties were worse than natural aggregate concrete which is the control set,but the differenceis limited. So,we''ve got a conclusion that it is suitable acceptability to adopt recycledcoarse aggregate in the concrete production.