| 摘要 |
<p>A concrete article, e.g., concrete pipe or a sewer manhole, is made by preparing a form including the outside jacket (10) and an inner core (11), covering the surface of the core with a liquid impervious barrier sheet (13) having a sticky surface (22) of sheet (13) facing the cavity (25) into which the concrete is to be poured, pouring a copolymer modified concrete mix into the cavity (25) of the form and after curing, removing the form to recover the concrete article with the inside surface covered with the barrier sheet (13) and adhered thereto with an adhesion much stronger than that experienced in any previously known process.</p> |
