| 摘要 |
<p>12 A lightweight block useful as a patio tile, a border piece or a landscaping component, which has a density of 800 to 1,200 kg/m3 and is made from a concrete mix comprising stabilized wood aggregates prepared by sterilization of wood chips by thermal treatment, followed by a chemical treatment with a calcium salt first and then with at least one soluble silicate, the concrete mix also comprising, based on 750 liters of the stabilized wood aggregates: from 200to 350 kg of sand; from 200 to 350 kg of cement, such as silica fume or Portlandcement; from 8 to 15 kg of polymer additive, preferably a melamine-based polymer; from 80 to 175 kg of water; and optionally, at least one pigment such as iron oxide. This block is particularly interesting in that it is lightweight, it has a high bending resistance; it has a pronounced and decorative texture; and it is very porous, thereby making it self-draining and efficient as a sound absorber.</p> |
