Utilization of Recycled Aggregate in concrete has been employed due to
awareness of society in natural resources protection. The application of Recycled
Aggregate (RA) as coarse aggregate in concrete mixes has been iniated as to make use
effectively the waste materials. However the concrete using Recycled Aggregate or
familiarly known as Recycled Aggregate Concrete has obtained lower performance
compared to concrete using Natural Aggregate. Thus, in this research, Micronised
Biomass Silica (MBS) which is produced from rice husk has been used for improving
the performance of Recycled Aggregate Concrete. Concrete specimens containing
various percentages of Recycled Aggregate (0%, 25%, 50%, 75%,100%) and MBS
(0%, 4%, 8%, 12%) has been prepared for laboratory works. From the laboratory
works it was found that after 28 days, 12 % of MBS has the ability to enhance the
performance of 100% Recycled Aggregate in concrete for compressive strength up to
17.20 % and reduce the water permeability coefficient and water penetration up to
47.10 % and 7.5 % respectively. Thus it can be stated that RAC containing MBS has
better performance compared to RAC without MBS.
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