| 摘要 |
<p>A method of manufacturing a construction product, in particular a hollow cored constructed product, comprises the steps of feeding, with an oscillating feed (2), a dry liquid setting powder into a mould (5) having a substantially vertical bore former or formers (6) therein. The powder is compacted in the mould (5) by vibrating the former (6) and by applying pressure to the top surface of the powder after filling. The or each former (6) is withdrawn and the bore surface wetted by lightly spraying or by seepage from the bore former (6) during withdrawal, just sufficient liquid being applied to wet all of, but not saturate, the powder. The wetted product may then be removed from the mould (5) before setting commences but without collapse of the wetted powder. The powder may be reinforced by fibres of between 25 and 100 mm in length, continuous, vertically disposed fibres and/or open textured mats of 60 to 100 gm/m2 in weight. The content of the water and wetting agent setting liquid in the wetted product is up to 25% by weight of the dry powder. </p> |
