INFLUENCE OF RECYCLED AGGREGATES, FOUNDRY SAND AND FLY ASH ON COMPRESSIVE STRENGTH AND WORKABILITY OF CONCRETE
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Date
2013
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PAU Ludhiana
Abstract
There are significant environmental benefits of recycled aggregates prepared from demolished
concrete and reusing it as coarse aggregates for structural concrete, but the use of recycled
aggregates in concrete is yet limited. Fly ash is an industrial waste which can be used in
concrete as a partial replacement of cement. Foundry sand is also an industrial waste which
can be used to replace sand as fine aggregate in concrete. Thus, an experiment was conducted
in the laboratory of the department of Civil Engineering, Punjab Agricultural University
Ludhiana to investigate the Properties of concrete using recycled aggregates, foundry sand
and fly ash. The experiment was performed to check the compressive strength and workability
of M20 concrete. Cube samples 144 in nos. of size 150mm X 150mm X150mm were
prepared by varying percentage of fly ash as part replacement of cement by 0%, 5%, 10% and
15% and varying percentage of foundry sand as part replacement of fine aggregates by 5%,
10% and 15%. Water-Cement ratio was kept constant at 0.5. Workability was tested at the
time of casting of concrete samples. The results shows that there was an increase in the
workability with the partial replacement of fine aggregates by foundry sand and partial
replacement of cement by fly ash. The optimum value of compaction factor was at the
replacement level of 10 % of fly ash of cement & replacement level of 5 % of foundry sand
of fine aggregates. Curing was done for 3, 7, 14 & 28 days. Samples were tested for
compressive strength after 3,7,14 and 28 days. The optimum value of compressive strength
was achieved with replacement of 5% of cement by fly ash & 5% of fine aggregates by
foundry sand.
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