Rheological and Mechanical Characteristics of SelfCompacting Concrete Containing Corncob Ash
Abstract
This paper examines the effects of replacing ordinary Portland cement (OPC) with corncob ash (CCA) on
the rheology and strength properties of self-compacting concrete (SCC). The rheology and compressive
strength properties of different mixes of CCA-blended self-compacting concrete (CCA-SCC) were
compared with the conventional SCC with and without superplasticizer at varying water-binder ratios.
These properties were determined on fresh and hardened concretes respectively. The CCA-SCC mixes
with superplasticizer fulfilled European Federation of National Associations Representing for Concrete
(EFNARC) requirements for SCC flow properties except those in excess of 15 % CCA and those with
neither CCA-blended cement nor admixture. A higher dosage of superplasticizer or water-binder ratio was
required to meet the standard flow requirements. The CCA-SCC mixes exhibited the tendency for more
strength beyond 90-days due to pozzolanic reactions. The paper revealed that CCA enhanced the
rheological properties of SCC, while the rate of strength development was enhanced after 28-days curing
due to pozzolanic activities.
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