Abstract
Self-compacting concrete (SCC) is flowing in nature and hence viscosity modified agent (VMA) or higher amount of binder is used for stability of mix. The mix proportion of SCC is also different from normal vibrated concrete (NC). This modifies the properties of concrete at fresh as well as at hardened state. Three mixes, one VMA type SCC, one powder type SCC and one NC, are considered with identical water to binder ratio. Properties at fresh state such as workability and segregation resistance and at hardened stage such as compressive strength, elastic modulus, shrinkage, creep and elastic shortening are determined and compared. Powder type SCC shows superior properties at fresh stage. Also compressive strength of powder type SCC is found better than that of VMA SCC and NC. Observations show more shrinkage, elastic shortening and creep for powder type SCC as compared with VMA SCC and NC.
Highlights
Self-compacting concrete (SCC) can be defined as a concrete which can completely consolidate under its own weight and does not require any external efforts like vibration, floating, poking etc
Sangle way of achieving stability of mix is providing higher amount of binder material which is classified as powder type and other way is using chemical additives like viscosity modifying agent (VMA) which is classified as viscosity modified agent (VMA) type self-compacting concrete
Observed values for normally vibrated concrete (NC) and VMASCC are matching with predictions by ACI 209 R-92 whereas shrinkage for powder type SCC observed is more than prediction
Summary
Self-compacting concrete (SCC) can be defined as a concrete which can completely consolidate under its own weight and does not require any external efforts like vibration, floating, poking etc. K. Sangle way of achieving stability of mix is providing higher amount of binder material which is classified as powder type and other way is using chemical additives like viscosity modifying agent (VMA) which is classified as VMA type self-compacting concrete. Change in amount of binding material or use of VMA modifies properties of self-compacting concrete from normally vibrated concrete (NC) at fresh as well as at hardened state [3]-[8]. Investigations have been carried out for prediction of shrinkage, creep and elastic modulus of SCC using various codes. It shows that creep of SCC can be fairly predicted by Euro Code 2 provided the stress level is kept up to 30% of strength. The investigation is undertaken to study properties of two types of self-compacting concrete: VMA type (VMA SCC) and powder type (SCC 550) and normally vibrated concrete (NC) at fresh and hardened state. Prediction of shrinkage, creep and elastic modulus is done with ACI 209 R-92 and BS EN 1992-1-1-2004 and compared
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