13.08.UK

MADE IN UK

Concrete Impregnated Fabric...

www.concretecanvas.co.uk

ROAD RAIL AGRO OTHERDESIGNPOWER PETROCHEM MINING

2009 WinnerMaterial Connexion Medium Award

Material of the Year2011 Brit Insurance

Designs of the Year Nominee

BRITINSURANCEDESIGNAWARDS2011

2007 WinnerD&AD Yellow Pencil Award

Product Design

most productsinnovative

2011 Expert’s Choice WinnerMost Innovative Product

2012 R&D 100 Award winnerR&D Magazine

2013 Macrobert AwardFinalist

2013 Innovation Award WinnerRailtex Exhibition

TM

Concrete Impregnated Fabric...

Concrete Canvas (CC) can be used to provide a hard wearing erosion control surface for rapidly lining drainage and irrigation ditches. CC is typically used as an alternative to conventional concrete solutions such as poured, sprayed or pre-cast concrete.

The following guide provides useful information for installers, customers and specifiers of CC and provides an overview of installation techniques for the lining of ditches. The versatile nature of CC means that this document is not exhaustive and is intended for guidance purposes only.

Here are some key areas questions that you may need to consider before specifying or purchasing CC.

Which thickness?

CC is available in 3 thicknesses, CC5 (5mm), CC8 (8mm) and CC13 (13mm).

• CC5 can be used to line ditches with a solid substrate such as when relining an existing concrete channel or laying over a hard substrate such as rock. CC5 may also be used for temporary works.

• CC8 is the standard thickness specified for ditch lining and is recommended unless either of the conditions above or below apply.

• CC13 should be considered where a channel is to be trafficked, is exposed to high levels of debris, where water flow rates are above 8.6m/s or where the ground is particularly steep or unstable.

Which format?

CC is available as large bulk rolls (1.5T to 1.6T) or as smaller man-portable batched rolls (60kg to 70kg). See the product table below for exact specifications. Installation is fastest using bulk rolls dispensed using a spreader beam (available for hire/purchase). For sites where heavy lifting equipment is not available or access is limited the batched, man-portable rolls should be used.

Concrete CanvasTM Installation Guide: Ditch Lining

CC being laid using batched rollsCC bulk roll being laid using a spreader beam

CC Type Thickness (mm)

Roll Width (mm)

Dry Weight (kg/sqm)

Batched Roll Coverage (sqm)

Batched Roll Length (m)

Bulk Roll Coverage (sqm)

Bulk Roll Length (m)

CC5 5 1.0 7 10 10 200 200CC8 8 1.1 12 5 4.55 125 114

CC13 13 1.1 19 N/A N/A 80 73

TM

Concrete Impregnated Fabric...

Which layup?

CC can be laid along the length of the ditch (longitudinal) or across the width (transverse). CC13 and CC8 are supplied in roll widths of 1.1m, CC5 in roll widths of 1.0m. Consideration should be given to the channel profile design in order to minimise wastage. Some example profiles are given below based on a standard overlap of 10cm between adjacent layers. Care should be taken to position the overlap in the direction of water flow (like shingled roof tiles).

300mm x 300mm x 300mm ditch1 Canvas Layer100mm edge overlap

CC Layer

Substrate300

300 300

100 100

600mm x 600mm x 600mm ditch2 Canvas Layers130mm edge overlap

CC Layer 1

CC Layer 2

Substrate600

600 600

100100

1200+mm x 1200+mm x 1200+mm ditch1 Canvas Layer

900mm x 900mm x 900mm ditch3 Canvas Layers150mm edge overlap

1 Layer CC Longitudinal Layup

Fig 1.

3 Layer CC Longitudinal Layup

Fig 3.

3 Layer CC Cross Layup

Fig 4.

2 Layer CC Longitudinal Layup

Fig 2.

CC Layer 1 CC Layer 2

CC Layer 3

100 100900 90

0

900

CC Layer 1

150150

1200 1200

1200

CC Layer Cross Layup

2 CC Layers Longitudinal Layup

3 CC Layers Longitudinal Layup

1 CC Layer Longitudinal Layup

TM

Concrete Impregnated Fabric...

Which fixing method?

CC can be fixed down along the shoulder of the ditch using pegs or an anchor trench or preferably both. Concrete Canvas Ltd can provide pegs in lengths of 250mm and 380mm suitable for different ground conditions. Peg spacing will differ depending on loading and flow conditions. However, for a longitudinal layup pegs are typically spaced every 2m along the shoulders, whilst for a transverse layup pegs are normally applied at every joint (1m spacing).

In addition to pegging, the edge of CC can be buried along the shoulder to prevent undermining from surface water and this is particularly important for interceptor drains which collect water run-off along their edge. Burying CC also provides a neat aesthetic transition to the surrounding landscape.

A properly designed anchor trench can be used as a substitute to pegging but would normally only be used on low flow-rate applications or where pegs are unsuitable due to the location of sensitive underground infrastructure such as power cables.

Laying longitudinally is typically faster than laying transversely. However a transverse layup may be preferable if either:

• the channel side length is greater than 0.9m which can be difficult to fix using a longitudinal layup (see below)

• the channel geometry means that longitudinal layup is materially wasteful (see below)

Pegging - Longitudinal layup

Pegging - Transverse layup

0.7m>0.9m >0.9m 0.7m

0.7m

Transverse layup recommended where side slope is greater than 0.9m

Some channel geometries result in large overlaps for longitudinal layup

CC fixed in place with pegs and anchor trench

2m

or

TM

Concrete Impregnated Fabric...

Which jointing method?

CC can be jointed along the overlap by screws, sealants, grout or thermal welding. The vast majority of ditches use a screwed joint which provides a good mechanical bond and sufficient impermeability for most drainage applications. We recommend using stainless steel screws inserted at 20cm intervals along the overlap. The screws should be positioned between 2-5cm from the edge of the joint and applied prior to setting when the CC is still unset. The concrete within CC will then set around the thread of the screws. Please see the CC “User Guide: Jointing & Fixing” for a full range of jointing methods available.

1. Ground Preparation

CC will conform closely to the underlying surface contours of a ditch profile. The degree of ground preparation needed will depend on the ditch design and surface finish required. For the best results it is recommended that loose soil, vegetation, soft ground, protruding rocks and voids are removed.

2. Laying CC

The procedure for laying bulk and batched rolls is the same. Unwrap the CC, taking note of the roll direction as indicated on the packaging. Ensure that the fibrous surface of the CC is facing upwards and the PVC membrane is in contact with the ground. Align the CC roll with the ditch and simply unroll down its entire length and manually press and position the material into the ditch.

3. Positioning and Fixing CC

When positioning subsequent CC rolls, ensure that there is at least a 10cm overlap between layers and that all overlaps are in the direction of water flow. CC should be fixed in place with pegs, an anchor trench or both. Pegs should be driven through the un-hydrated CC along its length at spacing determined by the design requirements (see above) and at every joint.

Installation

1

3

2

CC jointed with adhesive sealantCC jointed using collated stainless steel screws

TM

Concrete Impregnated Fabric...

4. Hydrating CC

Once positioned, CC should be hydrated by spraying with water (sea water may be used). Spray the fibre surface with water until it feels wet to touch for several minutes after spraying. An excess of water should be used as CC cannot be over hydrated (minimum ratio of water:CC is 1:2 by weight). Re-spray the CC again after 1 hour if installing CC5, installing on steep slopes or installing in warm climates. It is important to ensure that overlapped and anchor trenched sections are hydrated. Refer to the CC “Hydration Guide” for instructions on the correct hydration procedure. Please note that you should not rely on natural precipitation to hydrate the material.

5. Jointing CC

The fastest and easiest method of jointing is using stainless steel screws at 20cm spacing as described above. These can be applied using an auto-fed collated screw driver, suitable collated screws are available from Concrete Canvas Ltd. If a screwed joint is not appropriate, for example where a higher level of impermeability is required, please refer to the CC “User Guide: Jointing and Fixing”.

6. Junctions, Baffles and Terminals

CC is very easy to shape before setting and can be easily manipulated to form ditch junctions and terminals. Baffles can be formed by laying the CC directly over fabricated structures made using sandbags or earth fill. CC can joined to existing concrete infrastructure using concrete anchor bolts or poured concrete which bonds well to the fibrous surface of CC

7. Setting

Once hydrated, CC remains workable for approximately 2 hours. In warm climates, working time may be reduced. CC will harden to 80% of its 28 day strength in 24 hours and is ready for use.

8. Maintenance

In the right conditions CC will naturally ‘green’ over time with moss and blend in with the environment. However CC will prevent root growing vegetation and weed growth, reducing the maintenance costs associated with unlined ditches.

Installation cont.

4

5

6

7

8

TM

Concrete Impregnated Fabric...© Concrete Canvas Ltd. 2013

Please note: As each customer’s use of our product may be different, information we provide, including without limitation recommendations, test results, samples, care/labelling/processing instructions or marketing advice, is provided in good faith but without warranty and without accepting any responsibility/liability. Each customer must test and be responsible for its own specific use, further processing, labelling, marketing etc. All sales are exclusively subject to our standard terms of sale document, available at www.concretecanvas.com, (all additional/different terms are rejected) unless explicitly agreed otherwise in a signed writing.

TM

Concrete Impregnated Fabric...

CC can be installed around existing infrastructureCC can be easily manipulated to form ditch junctions and terminals

CC can also be used to reline existing concrete water channelsA suitable mortar can be used to join and seal CC to existing infrastructure

Sand bags can be used to compress joints during settingCC will closely follow the profile of any ditch or embankment

Examples of detailing