different environmental conditions and applications. Is it possible to over-hydrate CC? One of the key features of CC is that the fixed internal volume and control during manufacture ensures void space is set within carefully prescribed bounds and subsequently limits the Water:Cement ratio achieved in the field. It is therefore not possible to over hydrate CC and can therefore be installed in adverse weather conditions. What happens if CC is under hydrated? The CC will not reach its full strength and the setting time may be delayed. Will CC set underwater? Yes. It will hydrate fully from immersion. Which thickness of CC should I specify? It depends on the application. Consult the application table in the CC User Guide: General or contact Concrete Canvas ® Ltd directly for technical advice. What methods are there of joining layers of CC together? The 3 most common methods are: a screwed overlap joint, a screwed and sealed overlap joint or a thermally bonded overlap joint. There are a number of other mechanical and non mechanical methods which may be suitable for particular applications, Please see the CC User Guide: Jointing & Fixing or contact CC for more details. What water should be used to hydrate CC? CC can be hydrated using saline or non saline water. The water does not need to be potable. Howmuchwater per m 2 of CC should be used for hydration? The minimum ratio of water:CC is 1:2 by weight. For Example, CC8 weighs 12kg/m2 and a minimum of 6 litres per m2 is required for hydration. CC cannot be over hydrated so an excess of water is always recommended. Is there a maximum inclination that CC can be installed onto? CC can be installed onto vertical surfaces. At what intervals should CC be pegged down? This is dependent on the application and the quality/inclination of the substrate; as a guide we recommend pegging at 2m intervals and at joints. Should CC be laid fibre or PVC surface facing upwards? CC should be installed with the fibre surface exposed. The fibre reinforced concrete layer will protect the PVC backing from weathering and UV damage. Can CC be used without the PVC? The PVC is an important part of how CC functions, both in terms of maintaining its waterproof properties and preventing water loss during hydration. We do not supply CC without the PVC backing.
Installation and Use How should CC be stored prior to use? CC should be stored under cover in dry conditions, away from direct sunlight and within the manufacturers sealed packaging. What is the shelf life of properly stored CC? When stored in the manufacturers packaging in the correct conditions, CC can be kept for up to 24months without significant degradation in performance. After the 24 month point CC will continue to function but it may take longer to reach the values specified on the CC data sheet. What is the shelf life after opening CC? CC will start to lose performance once opened and should be used within a few days to prevent any significant degradation. It is best practise to reseal any packaging after opening to extend this period as much as possible. Is it possible to lay CC in wet conditions? Yes. Once wet, CC has a working time of approximately 1-2 hours in a UK climate. Is it possible to lay CC in very cold conditions? Yes. Warm water should be used for hydration and plastic sheeting should be applied over hydratedmaterial during setting. Consult the CC & CCH Hydration Guide for further instruction or contact Concrete Canvas ® Ltd directly. Generally, the same setting conditions that apply to conventional concrete pouring should be observed when installing CC. Are there any special precautions to take when laying CC in very hot conditions? Yes. It is advised to hydrate CC at dusk to avoid the hydration water evaporating in warm environments. In very hot conditions, it is advised to re-wet the material at 2 hour intervals for the first 8 hours. What is the lifespan of properly installed CC? CC has a design life of over 50 years in conditions similar to a UK climate. For advice on specific climates please contact Concrete Canvas ® Ltd. Does CC require any post-installation maintenance? Providing it is installed correctly, CC requires no regular post- installation maintenance. How should CC be disposed of or demolished? CC can be demolished using standard construction demolition equipment and disposed of in the same manner as conventional concrete waste. Is it possible to accelerate or retard CC’s setting time? Yes. In sufficient order volumes, Concrete Canvas ® Ltd can accelerate or retard the setting times of CC to accommodate The CC should therefore only be used to provide surface erosion control rather than to increase the surface modulus of any given substrate. For this type of application we would typically recommend 2 layers of CC13 TM with an offset overlap and the 2 layers screwed together.
The informationcontainedherein isoffered freeofchargeand is, to thebestofourknowledge,accurate.However,since thecircumstancesandconditions inwhichsuch informationand theproductsdiscussed thereincanbeusedmayvaryandarebeyondourcontrol,wemakenowarranty,express
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