Resources & Environment

High resource efficiency, low environmental impact

Autoclaved aerated concrete's high resource efficiency gives it low environmental impact in all phases of its life cycle, from processing of raw materials to the disposal of AAC waste.

resources chartRaw materials
AAC is made from naturally occurring materials that are found in abundance - lime, fine sand, other siliceous materials, water and a small amount of aluminium powder (manufactured from a by-product of aluminium) - plus cement.

Thanks to continuous efficiency improvements, production of AAC demands relatively small amounts of raw materials per m3 of product, and up to a fifth as much as other construction products. No raw materials are wasted in the production process and all production offcuts are fed back into the production circuit. The small amount of surplus material left over after curing is ground and recovered for other uses.

The manufacture of AAC requires less energy than for all other masonry products, thereby reducing use of fossil fuels and associated emissions of carbon dioxide (CO2). Energy is also saved in the curing process since steam curing is carried out at relatively low temperatures and the hot steam generated in the autoclaves is reused for subsequent batches. Industrial-quality water is used and neither water nor steam are released into the environment. No toxic gases are created in the production process.

AAC's light weight also saves energy in transportation. The fact that AAC is up to five times lighter than concrete and two to three times lighter than clay brick leads to significant reductions in CO2 emissions during transport. To reduce the need for transportation, AAC manufacturers apply the principle of producing as near to their consumer market as possible.

AAC's excellent thermal efficiency makes a major contribution to environmental protection by sharply reducing the need for space heating and cooling in buildings (see Great Energy Efficiency fact sheet for further details).

In addition, AAC's easy workability allows accurate cutting that minimises the generation of solid waste during use. Unlike other building materials AAC does not need to be used in combination with insulation products, which increase the environmental impact and cost of construction.

Reuse, recovery and disposal
Throughout the life cycle of AAC, potential waste is reused or recycled wherever possible to minimise final disposal in landfill.

AAC manufacturers have taken on a voluntary commitment to recover separated and sorted AAC waste from construction and demolition sites for recycling and reuse. Where AAC waste is sent to landfill, its environmental impact is minor since it contains no toxic substances.

6ICAAC 2018 in Potsdam

From the 4th to the 6th of September 2018 in Potsdam, Germany will be held the 6th International Conference on Autoclaved Aerated Concrete

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New category Recommendations

Prepared by our Technical Committee you will find under this new category recommendations for design of reinforced AAC.

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Earthquake statement

Lightweight-Construction materials improve earthquake Resistance in Buildings: In 2016, a series of devastating earthquakes in Italy led to the harrowing loss of life. This tragedy was partially the result of the buildings and infrastructure being severely damaged in the process.

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Renewed EU Indstrial Strategy - EAACA signs Joint Paper

EAACA signs Joint Paper “For an ambitious EU industrial strategy: going further”: In September 2017, the European Commission outlined its ambition for a renewed EU Industrial Strategy in its Communication on “Investing in a smart, innovative and sustainable Industry”.

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EU Sustainable Energy Week 2018

EU Sustainable Energy Week 2018 will take place from 4 to 8 June 2018 in Brussels.

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Sustainable Energy Week 2017

... took place between 19 and 25 June 2017. See more at

Organised by local public and private organisations, Energy Days are activities and events that raise awareness of energy efficiency and renewables.

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