Blocks and panels


Production plants


Intelligent controls

Refurbishment / Modernization

Made in Germany

Service / Consulting

Additional Information on AAC

Production of AAC in Wehrhahn plants

Every individual part of a production plant is a link in a long chain of actions and reactions. The key is perfect flow.

Raw material preparation

Autoclaved aerated concrete (AAC) is produced by mixing the raw materials sand or pulverised fuel ash, cement, anhydrite (gypsum), lime, water and a small quantity of aluminium powder.


Dosing and mixing system

Wehrhahn’s fully automated dosing and mixing plant WECOMIX enables accurate dosing, weighing and mixing of all raw materials. The mixture is then poured into moulds, where chemical reactions cause it to rise like a cake.



After the cake has attained sufficient strength, it is removed from the mould and cut with wires and knives into blocks or panels with precision accuracy. Hand holds, tongue and groove are cut before the cake is autoclaved in order to avoid milling into the hardened material – a sustainable cost-saving measure and an element of our „zero system waste” concept.


Autoclaving / curing

After cutting, the AAC is hardened by autoclaving in a saturated steam atmosphere at a temperature of approx. 180 – 190°C. It is this steam curing that creates the unique crystalline structure and lends AAC its excellent qualities in comparison to building materials which are not steam cured.


Sorting and packing

After autoclaving the blocks or panels are packed and are then ready for dispatch to the construction site.

Wehrhahn - ACC Process


Wehrhahn - ACC Process


Wehrhahn - ACC Process

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More information

Wehrhahn - Autoclaved Aerated Concrete (AAC) Technology

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AAC (Autoclaved Aerated Concrete)