EXPERIMENTAL INVESTIGATION ON FRESH AND HARDENED PROPERTIES OF SELF COMPACTING CONCRETE WITH RECYCLED COARSE AGGREGATE
Keywords:
self compacted concrete, recycled coarse aggregate, processed and unprocessed state, Compressive strength, Split tensile strengthAbstract
Self compacted concrete (SCC) can be defined as a concrete that is able to flow under its own weight and
completely fill the formwork, even in the presence of dense reinforcement without any compaction, while maintaining
the homogeneity of concrete. SCC is also known as super workable concrete. In recent years certain countries have
consider the reutilization of construction and demolition waste as a new construction material has being one of the
main objectives with respect to sustainable construction activities. Currently, recycled coarse aggregate is mainly
being used as a substitute material for natural aggregate. This paper provides an overview on the experimental
investigation on the fresh and hardened properties of self compacting concrete using recycled coarse aggregate in
both processed and unprocessed state, and where the optimum percentage of recycled coarse aggregate required for
better results. In the present experimental investigation M35 grade of concrete was designed based on ‘Nan Su et-al
method’ of mix design. The natural coarse aggregate (NCA) was replaced by recycled coarse aggregate (RCA) at
different percentages such as 0%, 25%, 50%, 75% and 100%. Various tests were performed on the recycled aggregates
in processed and unprocessed state. The mineral additive used in present study was class-F fly ash. To reduce the
water binder ratio and to increase the flow ability of SCC, poly carboxylic ether based super plasticizer was used. Tests
on SCC such as slump flow test, V-funnel test, L-box test, compressive strength, split tensile strength were carried out.
The fresh properties of SCC in processed state for 500 revolutions have shown better results compared to unprocessed
state. For SCC using processed (500, 1000 revolutions) and unprocessed RCA the optimum value of compressive
strength, split tensile strength value is obtained at 50% replacement of NCA with RCA for 14 and 28 days.
