Voided concrete, recycling ideas


Our project at Whitmore Road has precedent. Background reading on the Byzantine church in Ravenna, St Vitale reveals the dome is ancient concrete filled with old pots to reduce weight, material use and to improve curing. The idea goes back to Imperial Rome where there was even a differentiation between reused olive oil amphorae in arch haunches and special jars as permanent formwork above. Vessels were placed upside down to avoid filling with water and overloading the structure. Weight savings were typically 10-15%. Our project at Whitmore Road has void formers made of recycled water bottles reducing frame weight and carbon footprint by 28%.

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