Fabric useful as a concrete form liner

A concrete form for making a smooth, flat concrete surface comprising:

• (a) a support with a smooth, flat surface;
• (b) a porous, two-sided fabric juxtaposed with, but not attached to, the smooth surface of the support, the fabric having a first fabric side having a pore size between 0.2 to 20 microns in order to prevent substantially all concrete particles from entering therein and a second side having a pore size larger than the pore size of the first side and between 10 to 250 microns;
• and
• (c) fabric stretching means to continuously stretch the porous, two-sided fabric uniformly over the support at a uniform tension of 0.2 to 3.0 kg/lineal cm throughout the concrete making process.

A concrete form for making a patterned concrete surface comprising:

• (a) support means having holes with an individual area of at least 0.25 cm.sup.2 to create the patterned concrete surface;
• and
• (b) a porous, two-sided fabric juxtaposed with, but not attached to, the surface of the support means, the fabric having a first fabric side having a pore size between 0.2 to 20 microns in order to prevent substantially all concrete particles from entering therein and a second side having a pore size larger than the pore size of the first side and between 10 to 250 microns;
• and
• (c) fabric stretching means to continuously stretch the porous, two-sided fabric uniformly over the support means throughout the concrete making process.

A process for making a concrete form used in making a patterned concrete surface comprising the steps of:

• (a) establishing a support having the shape desired for a concrete article to be made;
• (b) affixing a grid to the support wherein the grid has interconnected spacing members which form holes in the grid having an individual area of at least 0.25 cm.sup.2 to create the patterned concrete surface, and at least a portion of the spacing members rest against the support;
• (c) juxtaposing, but not attaching, a porous, two-sided fabric to the grid, the fabric having a first side with a pore size of between 0.2 to 20 microns in order to prevent substantially all concrete particles from entering therein and a second side with a pore size larger than the pore size of the first side and between 10 to 250 microns, the fabric set apart from the support by the grid;
• and
• (d) continuously stretching the porous fabric uniformly over the grid throughout the concrete making process.