Secondary Containment

Concrete Concrete Cloth™ (CC) Geosynthetic Composite Cementitious Mat is a flexible concrete impregnated geotextile that hardens on hydration to form a thin, durable, fiber reinforced concrete layer. This material is ideal for hard armor capping of earth dikes which are used for secondary containment of hazardous liquids. Concrete Cloth has a number of unique characteristics that make it an ideal solution for secondary containment.

We have compiled a report detailing some of the most common problems faced in secondary containment. We review the failures of a number of other applications and summarize how Concrete Cloth is a total solution for secondary containment. Find out how we solve the following problems faced by many storage tank facilities:

  • erosion
  • vegetation
  • geomembrane ruptures
  • clean-up/remediation
  • protrusions/obstacles
  • maintenance costs
  • safety issues
  • damage by freeze-thaw cycles


    Secondary Containment

    Erosion Protection
    CC provides high level protection against degradation of earth dikes by preventing surface erosion from wind, rain and freeze thaw. CC significantly extends the operational life span of the dike, reducing through-life maintenance and rebuild costs.

    Rapid Install
    CC can be installed at a rate of 800 sqm/day by a 6-man team, reducing time required on site and significantly reducing overall project costs.

    Weed Suppression
    CC acts as an effective weed inhibitor, eliminating the maintenance required with grassed or earth dikes whilst providing a safe surface for trafficking.

    Plant Not Required
    CC can be supplied in man portable rolls eliminating the need for a concrete plant on site and allowing for installation in areas with restricted access.

    Install in Wet Weather
    Prior to hydration, CC layers can be cut to length using basic hand tools eliminating the hazards associated with using power tools in high risk environments. The ability to install CC in wet weather conditions reduces operation disruption and crew downtime.

    Conforms to Protrusions
    CC has excellent drape characteristics, allowing the material to conform in and around existing
    infrastructure, form sealed joints around pipe protrusions and negotiate sharp bends and variations in dike profile.

    Protects Sensitive Infrastructure
    CC produces no back spray, eliminating problems associated with using sprayed concrete or resin based lining and reinforcement systems around sensitive infrastructure.

    Prevents Animal Damage
    Reduces maintenance and repair work by eliminating the risk of membrane or structural damage from burrowing animals.

    Impermeability and Fire Protection
    CC has an integral water impermeable PVC membrane as well as inherent fire resistant properties which improve the containment characteristics of existing earth dikes.

    Efficient Material Transport
    Up to 200 square meters of CC can be supplied on a single pallet greatly reducing transportation logistics and on site storage.

    Secondary Containment

    Concrete Cloth Characteristics

    Concrete Cloth is a flexible cement impregnated fabric that hardens on hydration to form a thin, durable water proof and fire proof concrete layer.

    Essentially, it's concrete on a roll Just Add Water.

    Easy To Use

    Concrete Cloth is available in man portable rolls for applications with limited access or where heavy plant equipment is not available.

    There is no need for mixing or measuring, the concrete is premixed and cannot be over hydrated. It will set in fresh and sea water.


    Once hydrated, Concrete Cloth remains workable for 2 hours and hardens to 80% strength within 24 hours.

    Accelerated or retarded formulations can be produced to meet specific customer requirements.


    Concrete Cloth has good drape characteristics, allowing it to take up the shape of complex surfaces including those with a double curvature. Unset Concrete Cloth can be cut or tailored using basic hand tools.

    Hydrocarbon Resistance

    CC offers hydrocarbon resistance to BS:14414; based on a 56 day immersion test at 50°C


    The fibre reinforcement prevents cracking, absorbs energy from impacts and provides a stable failure mode.


    Concrete Cloth is chemically resistant, has good weathering performance and will not degrade in UV.

    Water Proof

    The PVC backing on one surface ensures that the material is completely water proof and chemically resistant.

    Fire Proof

    Concrete Cloth is a ceramic and will not burn.

    CO2 Savings

    Concrete Cloth is the only way of laying a thin concrete layer from a prefabricated roll of material.

    This enables up to 150 mm of poured concrete to be replaced with just 8 mm for many surfacing applications.

    As a result, material savings of 95% can be achieved for a typical construction project.

    This directly reduces the CO2 footprint of construction work not only through material savings but also through reduced road transport and time on-site.

    Low Wash Out

    Concrete Cloth traps dry concrete powder in a 3-dimensional fibre matrix. Testing based on BS8443 to indicate the effect of underwater setting, shows that Concrete Cloth loses only 3% by mass.

    By comparison, specialized underwater concretes typically lose between 10-15% while also requiring much larger volumes to be poured.


    Concrete Cloth uses a specialized high early strength concrete with a limited alkaline reserve. Unlike most concretes, it is not classified as an irritant and is less damaging to the environment.

    Environment Agency Approval (UK)

    Concrete Cloth was approved for use by the Environment Agency (EA) Biodiversity team in 2010 for the Church Village Bypass Project.

    Benefits cited included ‘surface roughness to provide diversity in the channel's morphology’ and its ability to introduce ‘sinuosity in the channel line’.

    Several projects have since been granted approval on a case-by-case basis and the EA recently purchased Concrete Cloth directly for internal use as a weed inhibitor.


    Untreated Concrete Cloth will naturally ‘green’ over time as the textured top surface allows moss growth, whilst the fibre-reinforced concrete layer will prevent root-growing vegetation, which would otherwise restrict water flow and increase maintenance costs.

    Nuna Innovations Inc.

    Toll Free: 1.855.815.4385
    Telephone: 1.604.815.4385
    Fax: 1.604.815.0098