| 摘要 |
In producing an additive for a building material, lightweight granules (e.g. polystyrene beads) are first coated with a waterproof adhesive by mixing in a suitable mixer. When the granules are satisfactorily coated, they are further coated with a wet cementitious material, for example aggregate and wet cement, or with wet plaster, which is added to the mixer. Only sufficient moisture is added to allow the cement or plaster to go off. The wet material acts to separate the granules while forming a coating thereon. The granules are then removed from the mixer and allowed to dry and set. The dry granules may then be added to a conventional concrete or plaster mix. |
