A precast concrete block or flag pavement comprises a relatively thin layer of concrete supported on a sub-base, compared with the equivalent in-situ concrete pavement requiring a greater thickness of concrete. Also, precast concrete paving and kerbs from Interpave manufacturers use less cement than site-poured concrete pavements and kerbs. This is because products are manufactured on modern, automated plant under factory conditions using concrete with low cement/water ratios that is pressed and vibrated to ensure full compaction of the concrete mix and then cured in controlled conditions, maximising strength and durability characteristics, with minimal waste.
Harvesting and recycling of water for manufacture is a growing trend - in fact some Interpave manufacturers' plants use no mains water. Interpave manufacturers are also reducing cement in their processes and maximising cement replacement products - involving extensive research and testing - with no performance disadvantages.
Recycling is well established in the precast concrete paving industry with reuse of some products where practical, enabled by their long life span. This is particularly common with reinstatement following below-ground work, for example to services without leaving evidence, in contrast to the patched areas always apparent in an asphalt reinstatement. Alternatively, precast concrete paving products can be crushed as aggregate for reuse where it is sustainable to do so - with the aim of saving energy, carbon footprint and waste.
An Interpave member reduced the use of water from mains and boreholes by 30% between 2003-2005 by greater use of recycled water and harvested rainwater.
Further Information
Full details of Interpave members’ sustainability initiatives can be found on their individual websites. Click here for more info >
