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There are few reasons of cracks getting developed on a wall .Therefore it is quite essential that we take certain precautionary measures while constructing.

Ceiling deflection and movement – A ceiling above a partition wall may deflect under loads applied after its erection, or through thermal or other movements. To avoid cracking as a result of such deflection, the partition wall shall be separated from the ceiling by a gap or by a layer of lean mortar.

Deflection or movement of structural abutments -Walls, columns or other structural elements against which a wall or partition abuts may deflect or move because of load, settlement, shrinkage or thermal effects. In order to avoid cracking of walls or partitions as a result of such movements, a slip joint shall be provided where possible, preferably packed with a resilient material or lean mortar.

Cracks in partition walls may occur at the corners of door frames and window frames at lintel level or sill level. It may, therefore, be desirable to provide a nominal reinforced concrete bond beam at sill level and vertical reinforced concrete stud at either side of vertical members of frames which may in addition provide sufficient anchorage for the holdfast. 

Control of Wall Movement Accompanying Temperature and Moisture Changes

Cracking in concrete masonry walls is often due to tensile stresses which develop when wall movements accompanying temperature and moisture change are restrained by other elements of the building, or when concrete masonry places restraint on the movement of adjoining elements.

There are three methods of controlling cracking in concrete masonry structures:

  1. a) Specifying a limit on the moisture content of masonry units at the time of delivery and construction,
  1. b) Incorporating steel reinforcement either in the form of nominal bond beams or horizontal joint reinforcement, and
  1. c) Providing control joints to accommodate the movement

In all concrete masonry construction it is essential to employ only moisture-controlled units. Their use, combined with the provision of control joints, is generally adequate to prevent cracking in concrete masonry walls. However, bond beams or joint reinforcement, or both in different locations as considered suitable, may also be used in addition to the above.

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Though AAC blocks are not that commonly used in the United States, they have been in use since over 90 years in the European countries. Countries in the Middle East have been making use of AAC blocks since 50 years. In India, AAC blocks are manufactured and taken into use since the mid of 1970s.

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AAC has been used widely in the construction project such as construction of hotels, buildings, offices, hospitals, restaurants, educational campuses, warehouses, and industries, commercial and residential projects. .

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Even an unskilled worker could use the AAC block in the construction project with just a very little training.

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AAC BLOCKS WITH >4 MPA WITH A NORMAL DRY DENSITY OF 551 TO 650 KG/CBM is GRADE I AAC Block as per BIS. For testing the same on any random sample first you need to oven dry the sample for at least 24 hours and then test the sample.