Self-compacting concrete can save time, cost and enhance durability for the structures that it is intended for. Let’s get to know about one of the many types of concrete: Self-Compacting Concrete (SCC).
- Self-compacting concrete is an innovative concrete that does not require vibration for placing and compaction.
- This concrete can be compacted into every corner of a formwork purely by means of its own weight, without using any external vibrators.
- It is a highly engineered concrete with a much higher fluidity
- It is cohesive enough to be handled without segregation or bleeding
- Admixtures used are superplasticisers and viscosity modifying admixtures
Properties of SCC in its fresh state
- Filling ability – it flows easily at certain speed into formwork
- Passing ability – passes through reinforcement without blocking
- Segregation resistance – the distribution of aggregate particles is uniform in both vertical and horizontal directions
Is SCC economical?
- The cost of scc is lower than normal concrete of high strength
- The cost of construction of scc material is 10-15% higher than normal concrete
- The cost of compaction, finishing etc. is low for scc and leads to savings on labour
Advantages of SCC
- Problems caused by vibrators are reduced
- Easy to place
- Faster construction
- Better surface finish
- Improves durability due to better compaction and uniformity of concrete
Disadvantages of SCC
- Higher paste volume results in greater shrinkage and creep
- The mix design and procedure adopted is too complicated for practical implementation
- It requires more trial batches
- More costly than conventional concrete based on materials (except for placement costs)
NB. Where can SCC be used?
- Structures with complex reinforcement distributions (e.g. Bridges, dams, piers, tall buildings and stadiums)
- Construction of raft and pile foundations
- Drilled shafts
- Construction of earth retaining systems