Skip to main content

AAC vs Non AAC Blocks

 Why Autoclaving is required when Non Autoclaved Aerated Concrete Blocks are available in the Market?

The matrix and the firmness of the AAC products are made due to autoclaving. 

AAC vs Non AAC Blocks

Technically, such product will start cracking by itself when it approaches equilibrium moisture content after a couple of years.

In the case of ordinary concrete products, there are no shrinkage troubles during the drying operation.

But in foamed or aerated concrete the mixture is air and if manufactured without autoclaving, drying shrinkage will cause cracking.

The calcium silicate hydrates formed during autoclaving is more stable than the one formed of cement at room temperature.

Autoclaved products have low shrinkage.

Cement will need four weeks to achieve its final strength at room temperature whereas, autoclaving takes only 12 hours. to get desired strength.

The mechanical strength will not be very high and through the drying, the shrinkage is going to be excessive.

It is possible to form foamed or aerated concrete without autoclaving but the properties are going to be very bad. Of course, such products will contain mostly cement.


  1. 888casino, Aussie Rules, and The Ultimate Guide - Dr
    888casino – Aussie Rules, 보령 출장마사지 and The Ultimate 부천 출장마사지 Guide The ultimate 파주 출장마사지 guide 성남 출장마사지 to betting on Australian 속초 출장샵 casino games.

  2. You have done good work by publishing this article here about Commercial Paving Companies in Toledo. I found this article too much informative, and also it is beneficial to enhance our knowledge. Grateful to you for sharing an article like this.


Post a Comment

Popular posts from this blog

Recipe Calculation for AAC Blocks

Recipe is nothing but knowing the dry weight (batch weight) of one batch or one cake. To find out dry weight, we should know the desired dry density of final block. Let us work on the density of 600 kg/m³. Batch Weight = Density x Mould volume Density = 600 kg/m3 Dimensions of the mould : Length = 4840 mm = 4.84 M Width = 1250 mm = 1.25 M Height = 670 mm = 0.67 M Volume of the mould: 4.84 M x 1.25 M x 0.67 M = 4.0535 M³ Batch Weight = 600 x 4.0535 = 2432 kg (We have taken mould height 670 mm, which is actually depth of the mould. Generally we maintain the cake height equal to mould level. But in some AAC factories, cake height may be 650 mm or 680 mm depending on the parameters like quantity of returns required, sinking of cake, uneven surface of the cake, etc., In this case cake height should be taken to calculate the volume.) Batch weight or Dry weight consists of binders (Cement and Quicklime), Fly ash or Sand, returns and anhydrite. Usually th

What is Aluminium Powder? Why it is used in AAC Plants?

  Aluminium Metal powder or paste Aluminium powder, which is commonly used as a reaction agent in AAC Plants, is a fine granular powder made up of Aluminium Metal. Process of Manufacture: The aluminium powder is usually manufactured in many forms such as flaky particles, granulated powder (atomised aluminium) etc. There are different processes one can use for the production of aluminium powder. The metal is melted in furnaces, and the temperature is maintained around 720 to 760 C. Atomised Aluminium is produced by blasting the stream of molten Aluminium into small articles by air jet. For this purpose, an atomiser is employed which consists of a straight tube with lower end dipped in molten metal and upper end terminating as a little orifice. A jet of hot air under pressure is passed through armular opening near the top which impinges on a stream of molten Aluminium drawn by suction through the orifice. This results in the formation of small particles of Aluminium. Th