What is meant by Dry Shrinkage? How to prevent it? How is it different from creep?
Factors which affect workability of concrete are: Cement content of concrete Water content of concrete Mix proportions of concrete Size of aggregates Shape of aggregates Grading of aggregates Surface texture of aggregates Use of admixtures in concrete Use of supplementary cementitious materials RefeRead more
Factors which affect workability of concrete are:
- Cement content of concrete
- Water content of concrete
- Mix proportions of concrete
- Size of aggregates
- Shape of aggregates
- Grading of aggregates
- Surface texture of aggregates
- Use of admixtures in concrete
- Use of supplementary cementitious materials
Refer this article for more details: Factors Affecting Workability of Concrete
Effect of Aggregate Cement Ratio on Workability of Concrete
Aggregate cement ratio is the ratio of weights of aggregate to the weight of cement. If this ratio is more, that implies aggregates are more and cement is less and if this ratio is less, that implies weight of aggregate is less and weight of cement is more (relatively).
When the weight of cement is more, i.e. aggregate cement ratio is less, the concrete has more cement paste required to coat aggregates and fill the voids between them. This more cement paste makes the concrete relatively easy to mix, place and compact as it reduces the friction between aggregates and allows its smooth movement. Thus the workability of concrete increases.
When the weight of cement is less, i.e. aggregate cement ratio is more, then there will be very less cement paste to coat aggregate surfaces and fill the voids, thus, mixing, placing and compacting of concrete will be more harder than previous case. This implies, the workability of concrete will be less than previous case.
Reference: Factors Affecting Workability of Concrete
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CB Sowmya
Dry shrinkage or drying shrinkage occurs due to loss of moisture in the concrete. There are different types of water in a hydrated cement paste. Dry shrinkage occurs due to the loss of capillary water. This water can be found in voids of sizes ranging from 5 nm to 50 nm in the hydrated cement paste.Read more
Dry shrinkage or drying shrinkage occurs due to loss of moisture in the concrete. There are different types of water in a hydrated cement paste. Dry shrinkage occurs due to the loss of capillary water.
This water can be found in voids of sizes ranging from 5 nm to 50 nm in the hydrated cement paste. Due to the small size of the voids, the water is held inside by surface tension or capillary tension. Due to the bond created by the surface tension, evaporation, or any other form of removal of this water causes significant volume changes to the structure. This volume changes causes dry shrinkage to the structure.
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