| 摘要 |
<p>The material for tank filling consists of porous concrete in granular and/or powder form. The concrete is produced by mixing finely ground quartz sand, lime, cement, natural gypsum and aluminum powder, transforming this mixture into a doughy mass by addition of water, followed by molding and steam hardening. The amounts respectively of quartz sand, lime and cement exceed 10 %, while the amounts of cement and natural gypsum lie between 1 and 10 %. The amount of aluminum powder is less than 1 % in the mixture. The claimed apparatus includes a bent blow pipe (5) carried by a holding structure (6) attached to the lid flange (4) of the tank (1), a delivery hose (8) connected to a delivery unit powered by compressed air , and a lid (9) which closes the tank shaft (2) and is provided with an air outlet opening (12) with a filter (13).</p> |
