| 摘要 |
<p>Concrete forms utilizing an improved concrete form liner comprising a two-sided fabric having a different range of pore sizes on one side compared to the opposite side. In one embodiment, a microporous coating, such as an ethylene-vinyl chloride microfoam dispersion, is placed on one side of a porous fabric (13) to controllably reduce the pore size of the fabric (13) on that side to between 0.2 to 20 microns. The coated fabric is used in combination with a support (11) and a grid (12) to form a concrete casting system (10) wherein the coated side of the fabric (13) is placed directly in contact with the concrete. The microporous coating stabilizes the surface fibers of the fabric (13) thereby reducing the tendency of the fibers to stick to the concrete. The pore size of the coated side of the fabric must be small enough to substantially keep all concrete particles from passing through the fabric, but sufficiently open to permit the passage of water and air.</p> |
