Aggregate Industries were contacted to advise on the best concrete mix solution for this privately owned residence designed to meet BRE PassivHaus standard. The strict standard dictates how much energy can be used for heating the building space (not exceeding 15 kWh/m2), along with other important criteria such as levels of insulation and airtightness. The client also wanted to use as much recycled and non-primary aggregate as possible in order to minimise the environmental impact of the building's construction.
With a long history of environmental scheme solutions to draw upon, we suggested the use of granite stent in the concrete mix. A by-product from the production of china clay in Cornwall, granite stent replaces the use of primary aggregate and consequently reduces the building's environmental impact. We supplied 148m3 of this specialised C32/40 mix from our Three Counties plant in Upton using 100% recycled/secondary aggregate, PFA cement replacement and 100% recycled water at plant level.
The ready-mixed concrete was complimented by the use of our precast panels, which helped achieve the airtightness specification.
Helen & Chris Seymour-Smith
- Low environmental impact
- Easy accessibility to technical help
- Environmental and technical expertise
- High standards met