Shrinkage cracks in AAC block walls can occur due to the following reasons:-
a) Drying shrinkage:-
As AAC blocks lose water and dry out, they can shrink, leading to cracks.
b) Autogenous shrinkage:-
Chemical reactions within the block can also cause shrinkage and cracking.
c) Temperature and moisture changes:-
Movement accompanying temperature and moisture fluctuations can cause tensile stresses, leading to cracks.
d) Structural movements:-
Changes in the building’s structure, such as settlement or thermal expansion, can cause cracks.
e) Inadequate reinforcement:-
Insufficient steel reinforcement in the wall can contribute to cracking.
f) Poor construction practices:-
Inadequate joint spacing, incorrect mortar mix, or insufficient curing can lead to shrinkage cracks.
g) High water-to-cementitious ratio in AAC block manufacturing:- This can increase the likelihood of shrinkage cracks.
h)Load-bearing walls:-
Cracks can appear due to the weight and stress on the wall.
i) Wind loads:-
External walls may be subjected to wind loads, causing cracks.
j) Deflection of slabs or beams:-
The wall may be subjected to loads from the deflection of slabs or beams above, leading to cracks.
