Erosion Control & Slope Protection

Time and time again we are called to jobs where stone riprap, poured concrete, sprayed concrete, corrugated steel and other applications have failed to protect slopes and channels from erosion. We often work in inaccessible areas that are difficult to reach with the equipment and machinery required to install traditional solutions.

Concrete Cloth™ (CC) Geosynthetic Composite Cementitious Mat is ideal for remote access sites where the use of traditional materials would be incredibly costly or even impossible because it enables concrete construction without the need for a plant or mixing equipment. All you need to do is position the cloth in place, secure it an add water. After 24 hours the Concrete cloth sets to 5,000 psi compressive strength (even underwater) to form a fiber reinforced, concrete layer. Concrete Cloth offers a solution to save time and labor even on the most remote jobsites.

Before Concrete Cloth is hydrated, it is flexible and easily workable. It conforms to the contours of the underlying subgrade which means that it requires less surface preparation and can be used in a much wider range of conditions compared to other solutions. Once hydrated, the cloth forms into a thin, durable, waterproof, hydrocarbon and fire resistant concrete layer that protects the subgrade from erosion and/or scour. high flow volumes and velocities and will wear very well in the field.

Concrete Cloth offers a solution that is virtually maintenance free for their entire design life. Damage from unforeseen happenings, are able to be repaired quickly and effectively without significant cost, logistics or manpower.


Ditch Lining

In December 2014, Concrete Cloth (CC) GCCM* was used to protect a slope that was suffering from weathering erosion, leading to rockfall onto the road. CC was installed, with shotcrete being installed simultaneously on a different part of the slope, to see which was the better method. The CC was over twice as fast to install as the shotcrete alternative, taking just 5 days instead of the shotcrete’s 12, and also resulted in cost savings. Additionally, the shotcrete required the entire road to be closed for the duration of the works, whereas with CC the road remained open. Furthermore the shotcrete is already showing signs of failure with noticeable cracking occurring.
 
 


Milliken

Shotcrete (sprayed concrete) was used in an erosion control application at a mine in Alaska. Two miles of shotcrete lined ditches had been installed in the previous two years and proved this was not a long term solution. Storm water had undermined the ditch which, when coupled with freeze-thaw weathering and heavy spring rains, had caused extensive cracking of the shotcrete
leading to failure.
Milliken

Concrete Cloth was used to remediate an eroded corrugated steel half-pipe corrugated that had deteriorated to the point that vegetation growth through missing sections was limiting flow capacity. The speed of install was critical, as work required lane closure and traffic management measures for an adjacent residential area.
Milliken

Concrete Cloth (CC) GCCM* was used to remidiate a deteriorated pre-cast concrete flume. The whole length of the flume had algae, moss and grass growth, covering a varying amount of the top surface. There was a substantial build up of gravel and detritus at certain locations and the condition of the concrete panels was variable. Rather than using conventional concreting techniques, Concrete Cloth was proposed to significantly mitigate the need for costly periodic repairs. Traditional options previously used had included sprayed concrete and removal and replacement of sections of existing concrete.
Milliken

Extensive erosion was eroding ditches, causing them to become deeper and wider as the year wears on. This creates 3 other conditions. The first is an undercutting of the bank and the second is an undercutting of the roadbed itself. The third condition is the erosion around the power line poles at the side of the road. Rip Rap and silt fencing were originally specified, but were not able to remedy the problem. Concrete Cloth provided a cost effective, low maintenance, long-term solution for this problem.
Milliken

Concrete Cloth (CC) GCCM* provides a stable alternative to fabric or composite silt fencing that will be strong, durable, and virtually maintenance free throughout its service life.

Concrete Cloth Characteristics

 

What is it?

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 hydratred. 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.

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