Also known as Pervious Concrete
Permeable (also knows as pervious) concrete is able to allow water to pass directly through from the top surface to the bottom. This type of construction allows surface water to penetrate the subgrade and in some cases eliminated the need for storm water drainage requirements. Permeable concrete has been around since the 1800’s in various forms but recent high density housing has lead to a resurgence in demand.
This environmentally sympathetic construction can allow rigid pavement for patio’s and car parking without adding to the sites non permeable area. Permeable concrete can greatly reduce private and public stormwater infrastructure requirements and costs. Permeable concrete also restores ground moisture levels to sustain vegetation growth and health in built up areas.
There are some downsides to Permeable concrete unfortunately. Some aggregate will loosen from the concrete's surface (called ravelling) and it can be a little uneven in texture and appearance. It can become easily clogged with fine material such as soil and vegetation. It also has a different methodology for placement so your concrete placers need to be aware of what's required before concrete placement (traditional concrete is poured, screeded, floated, troweled and water cured, permeable concrete is poured, struck to height, roller compacted and covered). If Permeable concrete is to be the “finished surface” please ensure your contractor is familiar with the material and placing process.
This composite concrete construction has a base course of 150mm special fibre reinforced Hygrocrete™ permeable concrete which is placed, struck to height and roller compacted. Then an 80mm Hygrocrete™ topping concrete is laid over the permeable concrete (the topping concrete can be barrowed or pumped over the Hygrocrete™ permeable concrete. The composite material has saw cuts at regular intervals to provide permeability in accordance with the site requirements (see table 1).
This composite material is less likely to clog like traditional permeable concrete and debris can easily be swept or blown off the surface just like regular concrete maintenance. In some cases Hygrocrete™ permeable composite concrete may be able to be laid without any fall as the surface water does not need to be directed to cess pits. In summary Hygrocrete™ permeable composite concrete looks great, is fast and easy to construct, is what your customer expected and is permeable.
Allows stormwater to pass through the surface and into the subgrade and ground.
Hard wearing attractive surface in any colour you want.
Cost effective and fast to construct.
Prevents hydrocarbons, heavy metals and other contaminates from entering the stormwater system.
Ability to “store” stormwater within the permeable voids (30L/m2 at 150mm permeable thickness).
Reduces the demand for public stormwater infrastructure.
Returns the moisture to the ground benefiting the immediate environment.
-s a material that contributes to “Sustainable Urban Drainage Systems” (SUDS)
For residential applications:
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