What is the reason for this type of crack?
- Thread starter Abrar Haware
- Start date
it might be stirrups near to the edge of concrete.and also due to high tempreature
It due to not enough cover to reinforcement and Temprature.
Libin
Newbie
jayesh195
Newbie
Concrete should not be disturbed until its finally set.Formwork might've displaced during final setting.
In addition, the concrete has bleeded enough hence cracked due to shrinkage.
Please correct me if I am wrong.
Good day!
In addition, the concrete has bleeded enough hence cracked due to shrinkage.
Please correct me if I am wrong.
Good day!
Dnyan Deshmukh
Staff member
Concrete may crack in following condition
Excess slurry at top due to overvibration - it will lead to more shrinkange and more cracking.
Less cover to reinforcement from top - concrete tries to shrink and rebar wont shrink, as there is less thickness of concrete above rebar, it tend to crack in the pattern of reinforcement bar (mostly in case of slurry accumulation in top portion due to overvibration)
Another xause is Temperature, you might have done concrete currectly but during summer rebar tend to get hot under sunlight.
So when this heat get transfer from rebar to concrete, hydration rate increases and xauses more heat which tend to cracking on surface in pattern of Rebar.
Ways of prevention
Starts early curing will help to avoid early shrinkage by maintaining surface tension at top of concrete.
Covering the top portion immediately after finish with sacks, plastic, tarpaulin, hessian cloth etc.
Doing Retroweling or broom finish on top of concrete surface in case of slab.
During summer sprinkling water on rebar to cool it down, before starting concrete.
Excess slurry at top due to overvibration - it will lead to more shrinkange and more cracking.
Less cover to reinforcement from top - concrete tries to shrink and rebar wont shrink, as there is less thickness of concrete above rebar, it tend to crack in the pattern of reinforcement bar (mostly in case of slurry accumulation in top portion due to overvibration)
Another xause is Temperature, you might have done concrete currectly but during summer rebar tend to get hot under sunlight.
So when this heat get transfer from rebar to concrete, hydration rate increases and xauses more heat which tend to cracking on surface in pattern of Rebar.
Ways of prevention
Starts early curing will help to avoid early shrinkage by maintaining surface tension at top of concrete.
Covering the top portion immediately after finish with sacks, plastic, tarpaulin, hessian cloth etc.
Doing Retroweling or broom finish on top of concrete surface in case of slab.
During summer sprinkling water on rebar to cool it down, before starting concrete.
Dnyan Deshmukh
Staff member
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