Abstract:
Self-consolidating concrete—as the name implies—is the concrete
requiring a very little or no vibration to fill the form homogeneously. Selfconsolidating concrete is defined by two primary properties: Ability to flow
or deform under its own weight (with or without obstructions) and the
ability to remain homogeneous while doing so. High range water reducing
admixtures are utilized to develop sufficient deformability. At the same
time, segregation resistance is ensured, which is accomplished in one of the
following two ways; introducing a chemical viscosity modifying admixture
(VMA) or increasing the amount of fines in the concrete.
The study explores the use of Rice Husk Ash (RHA) to increase the
amount of fines and hence achieve self-compactibility in an economical
way, suitable for Pakistani construction industry.
The study focuses on comparison of fresh and hardened properties of
self-compacting concrete containing varying amounts of rice husk ash with
that containing commercially available viscosity modifying admixture. The
comparison is done at different dosages of superplasticizer keeping cement,
water, coarse aggregate, and fine aggregate contents constant. The mix
design satisfies EFNARC guidelines 2002
