| 摘要 |
<p>The invention relates to a process for the production of concrete building products having thicknesses in section of not greater than 15mm in which a cementitious composition comprising (i) aggregate, (ii) hydraulic cement, and (iii) water is shaped by a roller and slipper method to produce a shaped extrudate which is divided to form sections and the sections are cured to provide the building product; the composition additionally comprising reinforcing fibres in weight percent to the total weight of the composition of 0.25% to 4%, said fibres having lengths of 2.0 mm to 20 mm. This process provides impact resistant roofing products which are useful as roofing tiles, or a replacement for shingles, shakes and slates.</p> |
