Fresh concrete

When concrete is its plastic state it is known as fresh concrete. Fresh concrete can be easily moulded to a durable structural.

Factors To be noted On Fresh Concrete

· Chemical composition of Portland Cement

· Hydration and development of the microstructure

· Admixtures

· Aggregate characteristics

· Placement

· Consolidation

· Curing

· Properties of Fresh Concrete

Fresh concrete means the concrete which is just mixed and is about to place in the forms. Properties of fresh concrete holds long term behavior of the concrete. It is important to perform some tests on fresh concrete in order to have desired long term results. Properties of fresh concrete include workability, air content, temperature and setting time.

Fresh concrete is that stage of concrete in which concrete can be moulded and it is in plastic state.

Sometimes it is also known as green concrete.

It is been observed that the potential strength and durability of concrete of a given mix is very much dependent on the degree of its compaction. It is therefore vital that the consistency of the concrete should be such that it can easily be transported, placed and finished early enough to attain expected strength and durability.

Hardened concrete is a concrete which must be strong enough to withstand the structural and service loads which will be applied to it and must be durable enough to the environmental exposure for which it is designed.

Properties of fresh concrete

· Fluidity or consistency: capability of being handled and of flowing into formwork and around any reinforcement, with assistance of compacting equipment.

• Compact ability: Air entrapped during mixing and handling should be easily removed by compaction equipment, such as vibrators.

• Stability or cohesiveness: fresh concrete should remain homogenous and uniform.

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