| 摘要 |
<p>The building construction material production method uses waste concrete broken down into fragments and graded by sifting, being typically granulated. This can be done in a crushing machine having two or more jaws (2,3) working against each other and moved towards each other in a frame. One jaw at least has protrusions (6) extending towards the other one, and so shaped that any intervening piece of concrete is subjected to a three-point bending load. The jaws can be upright, the clearance between them diminishing towards the bottom.</p> |
