Skip to main content

Non Autoclaved Aerated Concrete Blocks - Can we use them?


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

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.

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

Technically, such a 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.


  1. I liked your work and the way in which you have shared this article here about nuts and bolts. It is a beneficial and helpful article for us. Thanks for sharing an article like this.
    Decking Screws NZ


  2. Wow, excellent post. I'd like to draft like this too - taking time and extremely hard work to make a great article. Visit astm a193 grade b8. This post has inspired me to write some posts that I am going to write soon.

  3. Thanks for sharing the best information and suggestions, I love your content, and they are very nice and very useful to us. If you are looking for the best A320L7, then visit Jignesh Steel. I appreciate the work you have put into this.

  4. Thanks for your post. It's very helpful post for us. You can also visit Aqua Blu for more Victor Steel related information. I would like to thanks for sharing this article here.


  5. Nice reading, I love your content. This is really a fantastic and informative post. Keep it up and if you are looking for stainless steel 304 fasteners then visit Regal Sales Corporation.


  6. Thanks for such a pleasant post. This post loaded with lots of useful information. Keep it up. If you are looking for the best information and suggestions related to pipe fittings and flanges manufacturers then visit Rajendra Piping & Fittings.


  7. Thanks for sharing the best information and suggestions, I love your content, and they are very nice and very useful to
    us. If you are looking for the best high tensile plate, then visit hightensilesteelplate. I appreciate the work you have put into this.

  8. I agree with a lot of the points you made in this article. If you are looking for the instrumentation valve, then visit Oshwin Overseas. I appreciate the work you have put into this and hope you continue writing on this subject.

  9. I will prefer this blog because it has much more informative stuff. Visit ASTM A193 B6 Bolts for more related information and knowledge.


  10. Information is very informative also you can click stainless steel 304 flanges ,and get such type of info, this is the great resource to get such type of information.


  11. Thanks for shared that blog with us. If anyone here searching SA 213 T22 then visit vishalsteelindia.

  12. Thanks for suggesting good list. I appreciate your work this is really helpful for everyone. Get more information at ASTM A193 B6 Bolts. Keep posting such useful information.

  13. Very insightful and amazing content. Do check out our website Kalpataru piping to know more about our products

  14. Well written article but also do check out our website Amardeep Steel to know more about our products

  15. You have worked nicely with your insights that makes our work bidwell concrete pavers for sale USA. The information you have provided is really factual and significant for us. Keep sharing these types of article, Thank you.


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

What is AAC? What are the properties of AAC? How AAC blocks are produced?

  Definition of AAC Blocks   AAC Blocks   A - Autoclaved A - Aerated C - Concrete   Autoclaved aerated concrete is a lightweight concrete containing uniformly distributed voids that is subjected to high-pressure steam curing.   Production of AAC Blocks   This is a light- weight building material produced by autoclaving a set mix of fine siliceous materials such as ground silica sand or flyash and the binders like Portland cement and lime. Lightness is achieved by incorporating a large proportion of closed microscopic pores in the slurry with the help of entraining or foaming agent. The basic raw materials are fine-ground sand or fly ash, cement, quicklime, anhydrite or gypsum, water, and aluminum  powder or paste as a rising component. A suitable mixture of these raw materials is poured into a mould, and the rising process starts due to the development of hydrogen gas formed by the reaction of aluminium in the alkaline suspension. After 20 to 40 minutes the maximum rising