| 摘要 |
<p>Mould for making a carrot shaped test piece easily removed from concrete comprises an outer frusto conical tube surrounding the hardneed concrete test piece with a wide open top and a narrow lower end, and an inner cylindrical tube standing centrally and approximately vertical, and longer than the outer tube, the inner tube closing the mould at the base, two pieces being removable as one each containing a sample inside, withotu disturbing the surrounding concrete.</p> |
