| Title |
The Quality Properties of Recycled Coarse Aggregate Produced by the Bar-crusherand the Fundamental Properties of Concrete Using Aggregate |
| Authors |
Baek Dae-Hyun ; Han Dong-Yeop ; Yu Myoung-Youl ; Han Cheon-Goo |
| Keywords |
Bar-crusher ; Recycled Coarse Aggregate ; Maximum Size of Coarse Aggregate |
| Abstract |
This paper presents the results of quality test of recycled coarse aggregate produced by the bar crusher and its effect on concrete properties. Recycled coarse aggregate by the bar crusher had larger density and shape index, and lower absorption ratio and loss due to abrasion than those of control recycled aggregate made by cone crusher and impact crusher due to improved peeling of mortar attached to the vicinity of aggregate and improved grain shape. For fresh properties, slump and air content had better results than those of concrete mased with recycled aggregate using existing crushing machine in order for bar crusher(S) > cone crusher(C)>impact crusher(I). For S, slump of concrete had favorable results with the increase of rotation speed, recycled aggregate contents and maximum size of aggregates. For compressive strength, the use recycled aggregates made with S and C had a favorable effect on the compressive strength of concrete except I. The variation of rotation speed of bar crusher led to reduction of compressive strength within 10%. At 500 rpm of rotation speed, compressive strength showed desirable values. An increase in recycled aggregates contents resulted in an increase in compressive strength. It is found that concrete with 40% of W/C had favorable compressive strength at 75% of recycled aggregates contents and with 60% of W/C, 50% of recycled aggregates. |