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AAC blocks plant

We offer two plant concepts with capacities from 50000 up to 300000 m3 per year to ideally serve the individual requirements of our customers. The quality of the AAC products is equally high across the different plant concepts. 


Main raw materials of AAC are siliceous material (sand, fly ash and Silicon tailings) and Calcium materials (lime and cement) mixed with foaming agent (aluminum powder). It is the product of light porous silicate through the following processes: batching, mixing, pouring, hardening, cutting, autoclaving and curing etc. Because of large amount of well-distributed tiny pores after foaming, it is named autoclaved aerated concrete.

AAC Classification: In general, it can be classified according to the types of raw materials, manufacture process and functions. Based on the shape of AAC products, it can be divided into: AAC blocks and AAC panels. It is a revolutionary material offering an unique combination of high durability and strength, low weight, excellent heat insulation, fire resistant, noise absorption, unprecedented build ability and superior ecological green features. In China, AAC is one of the light wall materials which was popularized and applied at the earliest and the most widely.

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

Our fully automated dosing and mixing plant that 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℃. 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.

Technical data



AAC plant


Annual output

15000 m³


Design Mix Proportion

Cement: quicklime: Sand: Gypsum



Aluminum powder paste

450 g / m³



400g / m³


liquid-to-solid ratio



Mixing period

6-7 minutes


Temperature of castable slurry



static stop time of green cake

2.0-2.5 hours


Static stop temperature



Green cake strength after static stop



In and out of the kettle time

0.5 hour


Exhaust (vacuum) time

0.5 hour


pressure rising time

1.5 hour


constant pressure time

7 hours


pressure dropping time

1.5 hours

Zhengzhou Bona Enterprise Co., Ltd.


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