Concrete that segregates loses strength and results in honeycombed areas next to the formwork.
A well designed SCC mix does not segregate, has high deformability and excellent stability characteristics Self-compacting concrete produces resistance to segregation by using mineral fillers or fines and using special admixtures.
Admixtures that affect the viscosity of the mixture are especially helpful when the grading of available aggregate sources cannot be optimized for cohesive mixtures or with large source variations.
A well distributed aggregate grading helps achieve SCC with reduced cementitious materials content and/or reduced admixture dosage.
Just as all concrete mixes should be carefully designed to achieve the required performance characteristics, properly placed and properly cured so should SCC.
Self consolidating concrete (SCC) is highly flowable, non segregating concrete that can spread into place, fill the formwork, and encapsulate the reinforcement without any mechanical consolidation (ACI 237).
In this project, the SCC was mixed on-site and pumped through a piping system to the specified point, located 200 meters away.
On this particular project, the construction time was reduced from 2.5 years to 2 years.
In certain instances the addition of superplasticizers and viscosity modifier are added to the mix, reducing bleeding and segregation.
Traditionally, concrete with the fluidity of SCC has had a very high water-to-cement ratio, which would lower compressive strengths and compromise durability.
Properly designed SCC can save time and labor without sacrificing performance.
The SCC zone is the place to learn all about SCC, self consolidating concrete as well as login to Sika’s SCC Mix Design Tool.
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