SHRINKAGE OF CONCRETE

1. SHRINKAGE OF CONCRETE
• Concrete is subjected to changes in volume either
autogenous or induced. Volume change is one of the
most detrimental properties of concrete, whichaffects
the long –term strength and durability. it causes
unsightly cracks in concrete and called concrete
shrinkage.
• Types of shrinkage
• Plastic shrinkage in concrete
• Drying shrinkage in concrete
• Autogenous shrinkage in concrete
• Carbonation shrinkage in concrete

2. SHRINKAGE OF CONCRETE

3. PLASTIC SHRINKAGE
• Cracks appear in the surface of fresh concrete
soon after concrete soon after it is placed and
while it is plastic. These cracks appear mostly
on horizontal surfaces.
• Plastic shrinkage cracking is more likely to
occur when high evaporastion rates causes
the concrete surface to dry out before it has
set

4. PLASTIC SHIRNKAGE

5. DRYING SHRINKAGE
• Shrinkage is defined as the contracting of a
hardened concrete mixture due to the loss of
capillary water. This shrinkage causes an
increases in tensile stress, which may lead to
cracking, internal warping, and external
deflection, before the concrete is subjected to
any kind of loading.

6. DRYING SHRINKAGE