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Wednesday, 17 July 2019
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Raw materials & technologies, Technologies

Recycling of autoclaved aerated concrete in floor screeds

Wednesday, 9 March 2016

Autoclaved aerated concrete (AAC) is a lightweight cellular concrete. Recycling AAC in concrete or unbound applications may cause problems because of high amounts of leachable sulfate.

Recycled AAC aggregate can replace up to 40% of the sand fraction in floor screed. Source: Judith Lisser-Meister/pixelio.de

Recycled AAC aggregate can replace up to 40% of the sand fraction in floor screed. Source: Judith Lisser-Meister/pixelio.de

A study by researchers from Flemish Institute for Technological Research (VITO) evaluates the recycling of AAC demolition waste as a replacement of sand in floor screed.

High pH conditions secure sulfate immobilisation

The cement binder reacted with sulfate released from the AAC waste to form ettringite. Sulfate release was in line with ettringite solubility control and below leaching limits defined by Dutch environmental legislation. High pH conditions are necessary to avoid excessive sulfate leaching. Pollution of AAC waste with gypsum impurities was found to be detrimental to sulfate immobilisation.

The study is published in: Construction and Building Materials, Volume 111, 15 May 2016, Pages 9–14

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