10 Questions You Should to Know about concrete canvas

It is a flexible, concrete filled geotextile that hardens on hydration to form a thin, durable and waterproof concrete layer. Essentially, it can be described as Concrete on a Roll™ and is used for a wide variety of applications including the rapid lining of drainage channels, providing slope protection, weed suppression, culvert repair and general concrete remediation.

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If the perimeter edge of the CC is terminating in a soil substrate (i.e. it is not going to be connected to existing infrastructure), excavate crest anchor trenches into the shoulders of the channel. Excavate Leading and Trailing edge anchor trenches on side slopes and along the invert.

Anchor trench dimensions must be a minimum of 150mm x 150mm but may need to be increased to suit the designer’s requirements.

Unroll CC on the channel profile to suit specified layup, ensuring the fibrous top surface faces upwards, with the PVC membrane in contact with the ground. This is achieved by dispensing the roll by naturally unrolling along the ground rather than pulling material from the top.

Fold back top layer and hydrate the material under the overlapped sections of the CC. Apply a suitable sealant as an 8mm diameter continuous bead along the line of where the screws will be positioned. Fold the top layer back into position and insert stainless steel screws at 50mm centres, 30–50mm from the edge of the top layer so that the screw is inserted through the sealant bead.

Spray the fibre surface multiple times until the CC is fully saturated. The wet CC will first darken and then become lighter as it absorbs the water. Do not spray high pressure water directly onto the CC as this may wash a channel in the material.

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To check proper hydration, the CC should feel wet to the touch several minutes after hydration. Press your thumb into the CC and release. If water is present in the depression in the CC, it has been sufficiently hydrated. If no water is observed, then more water must be applied.

CCX® is part of a revolutionary new class of construction materials called Geosynthetic Cementitious Composite Mats (GCCMs). It is a flexible, concrete filled geosynthetic which hardens on hydration to form a thin, durable, waterproof and lower carbon alternative to conventional concrete. Essentially, it’s Concrete on a Roll®.

CCX® is unrolled into position and secured in place. The material is then hydrated. There is a 30-minute working window before setting begins, and in 24 hours the material hardens to in-service performance specifications.

CCX® is manufactured in our UK production plant using bespoke machinery designed by Concrete Canvas Ltd. The process uses a unique patented method of inserting a cementitious material between two geosynthetic layers and stitched together to form a GCCM. For some CCX® product variants (discussed below), a LLDPE backing is applied to the bottom geotextile.

Based on environmental exposure testing, CCX® has a lifespan in excess of 50 years. For advice on specific climates, chemical conditions and applications please contact Concrete Canvas Ltd.

CCX-U® and CCX-M® have been independently tested to the performance properties listed in ASTM D – Standard Specification for GCCM Materials. Both products meet the minimum requirements of a Type II GCCM. Please see Technical Note 1 for more information on ASTM D.

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