Problems Related To AAC Blocks Usage

Problems Related To AAC Blocks Usage

In last year lot of new AAC blocks projects have come up across India. With increasing supply and promotion of AAC blocks, awareness about this sustainable product is also increasing. More and more builders are looking favourably towards AAC blocks as their preferred walling material. Although number of users in absolute terms might be small, growth in relative terms has been encouraging. This growth can reach higher levels but for certain misconceptions and issues related to usage AAC blocks.

We at AAC India constantly work towards building stronger foundations for AAC industry in India and ensure that our country as a whole benefits from this wonderful product. As a part of our initiative we are working on a whitepaper with one of the premier universities in India. This whitepaper will try to answer most common problems related to AAC blocks usage. Experts from industry as well as academics will answer these queries and help users understand how to use AAC blocks in an effective and efficient manner. Since it may not be possible for us to know about ‘all’ problems related to AAC blocks usage, we request you to share your views on this topic so that we can make it as elaborate as possible.

We have also tried to list couple of misconceptions/issues popularly associates with AAC blocks. We encourage you to add more to the list based on your experiences or perception.

  1. AAC blocks have higher water absorption compared to clay bricks!
  2. AAC blocks are not suited for external walls in areas with high rainfall!
  3. AAC blocks lead to higher project cost in high-rise buildings!
  4. AAC blocks are not as strong as clay bricks!
  5. A wall made of AAC blocks can’t hold nails!
  6. It is hard to carve conduit ‘jari‘ in AAC blocks wall.
  7. Plaster does not stick well to AAC blocks.
  8. Cracks appear in walls 2-3 months after plaster is applied.

List of problems related to AAC blocks usage runs pretty long.  While some problems are genuine, others are just misconceptions. We would love to try and accommodate all those in our whitepaper. You may also post your problems and observations on this thread titled Problems related to application of AAC blocks. So hit your keyboard with vengeance and send us your problems and we’ll love to include them in our whitepaper.

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  1. dear vishal , I have been using aac / clc blocks in my projects from last 2 years in jodhpur – Rajasthan . Both the masonry units gives probable cracks in tropical climate , high windy loads , moisture movements , drying shrinkage and load deflections .

    To counter these effects , u need very high quality workmenship , weaker mortar than masonry unit , bonding the blocks is main key , thin joint mortar has better bonding but still this mortar is high in strength and dry out quickly in summer season.

    The external plaster is required in two coats , but still cracks are seen .

    even on the using good quality mortar / workmanship / aac/ clc blocks , i doubt these masonry if not find a proper solution , will flourish the bad opinion about this product.

    I would welcome any mfg. , who knows to install these units succesfully where the daytime temp. reach 48*c and nighttime is 18*c . To handle the temp difference co-efficients of 30*c needs greater
    analysis and testing out in a larger mode .

    • Dear Vikram Kothari,
      While using AAC blocks workmanship a is necessary but while fixing the block the level of the block and make sure there is no air space left in the between the joining bond those air space can damage the plasting and it generate cracks.
      when using ordinary cement mortar the problem won’t comes. The crack usually comes in the area where the special thin join mortar is used.

  2. we need specific construction guidelines o each of the issues as listed above.it is understood that there is not much experience with the use of this product,but all the same we need guide lines for not making obvious mistakes,the refinement will come with experience

  3. Hi, can an AAC block of width 125mm be used in a 21 storied building for external walls .. is there any IS code for the same that specifies what thickness AAC block to be used where in residential high rise buildings ?

    • Dear Anup,

      Thank you for your response on our website. It would be better if you check your local building code. As far as I know most local building codes require minimum 200mm external walls. Moreover, 125mm might create issues for mounting windows.

      Regards,

      Vishal Kansagra

    • Dear Anup,

      Thank you for your response on our website. It would be better if you check your local building code. As far as I know most local building codes require minimum 200mm external walls. Moreover, 125mm might create issues for mounting windows.

      Regards,

      Vishal Kansagra