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Self Compacting Concrete: Hardened Properties
Introduction Is SCC a  new Concept? Why SCC does not require any compaction  SCC vs  High Slump Concrete
Performance Requirements of fresh SCC Rheologic properties  How is SCC made Methods of producing SCC
How is SCC mix different from conventional concrete mix Examples of SCC mixes Hardened   Properties 
Test methods for fresh SCC Benefits of SCC Cost of SCC Applications
Quality Control Precautionary measures Feasible performance specifications
The main differences between conventional vibrated concrete and SCC concrete are related to the behaviour in the fresh state.  

In terms of the hardened properties, at similar water/cementitious material ratio, properly proportioned, produced and placed SCC is generally denser and less variable than the equivalent conventional vibrated concrete, thereby resulting in improved strength and durability performance

In addition, compared to conventional vibrated concrete, SCC at similar water/cementitious material ratio is expected to have:

The same structural performance.
• Equal or higher compressive and tensile strength
• Equal to or lower shrinkage.
• Equal to or better bond to the steel reinforcement
• Lower surface absorption and therefore better durability.

These properties are discussed below:-

Compressive Strength: SCC compressive strengths are comparable to those of conventional vibrated concrete made with similar mix proportions and water/cement ratio. There is no difficulty in producing SCC with compressive strengths up to 60MPa.

Tensile Strength: Tensile strengths are based on the indirect splitting test on cylinders. For SCC, the tensile strengths and the ratios of tensile and compressive strengths are in the same order of magnitude as the conventional vibrated concrete.

Bond Strength:
Pull-out tests have been performed to determine the strength of the bond between concrete and reinforcement of different diameters. In general, the SCC bond strengths expressed in terms of the compressive strengths are higher than those of conventional concrete.

Modulus of Elasticity:
SCC and conventional concrete bear a similar relationship between modulus of elasticity and compressive strength expressed in the form E/(fc)0.5, where E = modulus of elasticity, fc = compressive strength. This is similar to the one recommended by ACI for conventional normal weight concrete. Long-term performance of SCC mixes, such as durability and creep, are unknown at present due to the lack of long-term performance studies. The higher sand content of some of the mixes may lead to greater shrinkage values; however, testing to date shows that most SCC mixes exhibit similar shrinkage values to that of normal concrete.

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Concrete-Techgroup expresses its gratitude to Mr Larry Storer  for permitting  the use of article “Self-compacting concrete: powerful tool for complicated pours” (written by Tim Avery in March’04 issue of CONCRETE Monthly).
Other References:
1.“Development of High-Strength Self-Compacting Concrete with reduced segregation potential”  by    Dr. R. Sri Ravindrarajah, D. Siladyi and B. Adamopoulos
2.“Ultra High Performance  Self Compacting Concrete”  by    Jianxin Ma1 & Jorg Dietz1
3.Vic roads: GEO PAVE : Technical Note on Self Compacting Concrete
4. “Self-Compacting Concrete : Development, Applications and Investigations” by Masahiro Ouchi
5. “Applications of Self-Compacting Concrete in Japan, Europe and the United States”: US FHWA

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