What factors influence the creep of concrete, and what the step can be taken to reduce creep?
The factors that affect creep of concrete are similar to the factors affecting shrinkage, which are as following:
i. Influence of Aggregate:
The stronger the aggregate the more is the restraining effect and hence the less is the magnitude of creep. The effect of aggregate and their properties do not affect the creep, but indirectly they affect the creep from the point of view of total aggregate content in the concrete. The higher the modulus of elasticity the less is the creep. Light weight aggregate shows substantially higher creep than normal weight aggregate.
ii. Influence of Mix Proportions:
A poorer paste structure undergoes higher creep. Therefore, it can be said that creep increases with increase in water/cement ratio. In other words, it can also be said that creep is inversely proportional to the strength of concrete.
iii. Influence of Age:
Age at which a concrete member is loaded will have a predominant effect on the magnitude of creep. This can be easily understood from the fact that the quality of gel improves with time. Such gel creeps less, whereas a young gel under load being not so stronger creeps more.
iv. Effects of Creep:
The magnitude of creep is dependent on many factors, the main factors being time and level of stress. In reinforced concrete beams, creep increases the deflection with time and may be a critical consideration in design.
v. Admixtures:
Some admixtures (mainly accelerators) are also responsible for causing creep in concrete.
Other Factors:
1. Types of cement. 2. Entrained air. 3. Concrete strength. 4. Improper curing etc.
The factors that affect creep of concrete are similar to the factors affecting shrinkage, which are as following:
i. Influence of Aggregate:
The stronger the aggregate the more is the restraining effect and hence the less is the magnitude of creep. The effect of aggregate and their properties do not affect the creep, but indirectly they affect the creep from the point of view of total aggregate content in the concrete. The higher the modulus of elasticity the less is the creep. Light weight aggregate shows substantially higher creep than normal weight aggregate.
ii. Influence of Mix Proportions:
A poorer paste structure undergoes higher creep. Therefore, it can be said that creep increases with increase in water/cement ratio. In other words, it can also be said that creep is inversely proportional to the strength of concrete.
iii. Influence of Age:
Age at which a concrete member is loaded will have a predominant effect on the magnitude of creep. This can be easily understood from the fact that the quality of gel improves with time. Such gel creeps less, whereas a young gel under load being not so stronger creeps more.
iv. Effects of Creep:
The magnitude of creep is dependent on many factors, the main factors being time and level of stress. In reinforced concrete beams, creep increases the deflection with time and may be a critical consideration in design.
v. Admixtures:
Some admixtures (mainly accelerators) are also responsible for causing creep in concrete.
Other Factors:
1. Types of cement. 2. Entrained air. 3. Concrete strength. 4. Improper curing etc.
https://www.quora.com/What-factors-affect-the-shrinkage-and-creep-of-concrete
1. Water-cement Ratio:
The rate of creep is increased with increasing water cement ratio.
2. Humidity:
It is influenced by humidity and drying condition of the atmosphere.
3. Age Of Concrete:
The rate of creep rapidly decreases with time. The time taken by a concrete structure to attained creep is 5 years.
4. Aggregate:
Aggregates with moisture movement and low elastic modulus cause a large amount of creep. The rate of creep generally decreases with the increase of the size of aggregates.
5. Admixtures:
Some admixtures (mainly accelerators) are also responsible for causing creep in concrete.
Other Factors:
· Types of cement.
· Concrete strength.
Improper curing etc
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