| 摘要 |
<p>The present invention provides a producing technique of round polished concrete aggregate in which water-absorption characteristics are suppressed as low as possible while rounding an outer shape of the round polished concrete aggregate, and when the round polished concrete aggregate is used as concrete aggregate, a percentage of absolute volume can be enhanced and a unit water volume can be reduced. The technique includes a material grinding process A in which waste concrete material aggregate 10 is ground to obtain ground concrete aggregate 12 and concrete powder 13, a concrete powder layer adhesion process B in which cement 3 is mixed into ground concrete aggregate and concrete powder and stirred, thereby adhering concrete powder layer 14 to an outer peripheral surface of the ground concrete aggregate, and round rough surface concrete aggregate 15 having round outer shape is obtained, and rubbing process C in which the round rough surface concrete aggregates are rubbed against each other, thereby obtaining round polished concrete aggregate 17 and rubbed-off concrete powder 18 whose surfaces are formed into polished surfaces 16. <IMAGE></p> |
