Rock-in-Roll is a high tensile, low compressibility Void-Maintaining structure, which replaces free-draining aggregate underneath concrete slabs. Rock-in-Roll is comprised of top and bottom layers of geotextile sandwiched around a center Void-Maintaining geonet. The Void-Maintaining geonet in this structure is composed of top and bottom horizontal ribs separated by strong vertical ribs.

On the other hand, concrete slabs do not shrink uniformly from top to bottom; the top dries out more rapidly than the bottom, particularly in hot climates and during summer months, and tends to shrink more. As a result, an initially uniform slab becomes shorter at the top than at the bottom, and tends to dish upward around the periphery. This phenomenon is called curling. Curling includes tensile stresses in the top part of the slab, as the slab ends tend to bend downwards under the self weight and traffic loading, and if these stresses exceed the tensile strength of the concrete, cracks will appear.

Tenax Rock-in-Roll is a high tensile, low compressibility Void-Maaintaining structure, which replaces free-draining aggregate underneath concrete slabs. Rock-in-Roll is comprised of top and bottom layers of geotextile sandwiched around a center Void-Maintaining geonet. The Void-Maintaining geonet in this structure is composed of top and bottom horizontal ribs separated by strong vertical ribs.

Rock-in-Roll is hydraulically equivalent to 4 inches of open-graded/free-drainable base course. When compared to natural drainage material, Rock-in-Roll maintains its performance criteria as a controlled manufactured product, under the construction loads and conditions. On the contrary, the natural drainage material is exposed to the contamination of finer soil during or after construction. Rock-in-Roll helps the concrete slab to reach the commonly required water-vapor emission rate in a shorter period of time, by providing a second surface for water to drain. Rock-in-Roll causes no negative effects on the compressive strength of concrete at any age.

Rock-in-Roll provides a supportive layer underneath the floor slab to bridge soft spots, enabling the slab to perform better by reducing the cracks and tensile stresses resulting from a differential settlement. In addition, Rock-in-Roll also provides a capillary break to prevent the water from contacting the floor slabs.

TENAX Corporation
4800 East Monument Street, Baltimore, Maryland 21205, USA
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sales@tenax.com • www.tenax.com