Shoreline Protection

Concrete Cloth™ (CC) Geosynthetic Composite Cementitious Mat armors shorelines to prevent erosion and damage. Climate change is bringing more and more attention to this issue as events of shoreline flooding are on the rise. When the integrity of the shoreline is compromised, this threatens development and structures nearby. Whether it be repairing existing shoreline protection to offer a longer lasting solution, or creating a custom solution, Concrete Cloth is versatile enough to tackle jobs in almost any geophysical conditions.

 

Shoreline

 
Concrete Cloth is waterproof, abrasion resistant, and can withstand a strong hydrostatic head. Concrete Cloth cannot be over hydrated and an excess of water is recommended. CC can be hydrated with saline or non-saline water and will hydrate and set underwater without compromising in strength or durability.

Concrete Cloth can be installed in a variety of weather conditions so that you do not have to let the weather set back your project timeline. CC is chemically resistant, has excellent weathering performance and will not degrade in UV. 150 mm of poured concrete can be replaced with just 8 mm for many surfacing applications. Material savings of 95% can be achieved for a typical construction project.

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.

Unlike most concretes, Concrete Cloth is not classified as an irritant and is less damaging to the environment. Concrete Cloth has been approved for use in live water courses. The reconditioned fish farm reservoir was restocked 1 day after CC installation. Further, untreated Concrete Cloth will naturally ‘green’ over time as the textured top surface allows moss and algae growth to maintain a natural look.
 

Shoreline


Why not RipRap?

Riprap lacks flexibility to adapt to settlement, washing out of material,changes in terrain, etc. Hand placed riprap is susceptible to damage as the displacement of one piece may lead to the failure of surrounding pieces. Riprap installation requires a great deal of labor and time.

Slope

Riprap can be unstable on very steep slopes, especially when rounded rock is used. The steepness of the slope limits the applicability of riprap, because slopes greater than 2:1 can cause riprap loss due to erosion and sliding. If used improperly, riprap can actually increase erosion. In addition, riprap is often more expensive than Concrete Cloth due to the amount of material required and cost of transportation.

Maintenance

Riprap areas require inspection and survey annually and after all major storms. Also,vegetation growth control may be required in some locations. Common maintenance issues are slumping, sliding, or seepage problems. Concrete Cloth is virtually maintenance free throughout service life.

Cost

In typical locations where stone is readily available RipRap prices may be around $59-$86. In locations where quarries are difficult to access or are scarce, riprap can cost around $175 per ton. Shipping costs are additional and can range from $30-$300 per ton depending again on the location of the quarry and the distance to the site.

Additional material is also often needed to prepare the surface for riprap installation. A filter blanket is a layer of material placed between the riprap and the underlying soil surface to prevent soil movement into or through the riprap. This ads an additional material cost anywhere from $2-$35 per square meter, depending on the material chosen.

Installation

Correct installation is both laborious and time consuming. Improper installation frequently leads to riprap failure and heavy future maintenance costs. Special purpose equipment is required and water based operations may require specialized equipment for deep-water placement or may require land-based equipment loaded onto barges for near-shore placement.

Labor Requirements

Even machine placed riprap requires hand labor in order to correct irregularities and to carry out frequent measurements to ensure correct layer thickness.

Service Life

Among 65 sites in WA, OR, CA, CO, and MS evaluated in a California DOT study, 18% of sites had failed. Of the remaining sites, average service life was calculated to be approximately 16 years. Service life will depend heavily on the level of maintenance inputs.

Environmental Considerations

Riprap along streambanks can lead to thermal pollution as the sun heats the stone to high temperatures. As the rain falls on the stone, it warms up and raises the stream temperature. Several fish species are very sensitive to small increases in temperature.

Bank protection works often encroach into streams and may damage fish habitat by removing vegetation, changing the angle and general nature of the stream bank, increasing the size of materials exposed along the water line, and covering part of the bed and bank with coarse angular rock. Bank protection projects may also cause secondary effects, such as bed scour near the works and coarsening of the bed material, or opposite bank erosion that may also be detrimental to fish habitat.



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.

Rapid

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.

Flexible

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

Strong

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

Durable

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.

Alkalinity

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.

Greening

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
Email: sales@nunainnovations.com