| 摘要 |
<p>A method for modifying the surface texture of pre-cast building blocks said method comprising pressing cementitious material within a mould into pre-cast blocks and applying pressure on the surface of pre-cast blocks obtained in step so as to modify the texture thereof. The blocks are provide d with adequate time for curing and then their texture can be further modified . An apparatus for modifying the surface texture of pre-cast building bloc ks including a pressure-applying device so positioned as to selectively engage blocks and being adapted to apply a pressure on the surface of blocks so as to modify their texture thereof prior to curing of the blocks. Also disclosed A spacer for spacing adjacent blocks apart at a pre-determined distance when the modifying the surface texture of these blocks as well as a block- stabilizing device for stabilizing blocks during surface-texture modification operations</p> |
