AN EXPERIMENTAL ON USE OF FLY ASH PELLETS IN CONCRETE IN PLACE OF

International Journal of Research and Innovation (IJRI)
SPLIT TENSILE TEST
The test was carried out conforming to IS 5816-1999 to
obtain Split tensile strength of concrete at the age of 28
days. The cylinders were tested using Compression Testing
Machine (CTM) of capacity 2000KN. Then it is tested
for different percentage fly ash aggregate replaced as sand
in concrete.Table 5.5 Split Tensile Strength Values.
S. No Fly ash percentage
(%)
1 0 2.2
2 10 2.264
3 20 2.123
4 30 2.112
5 40 2.045
Split Tensile
Strength for 28
days
• By increasing the replacement of fly ash aggregate in
concrete the compressive strength will be decreasing
gradually.
• At 20% replacement level of fly ash aggregate used as
coarse aggregate in concrete the compressive strength is
increased as compared to conventional concrete and further
it goes to decreasing.
• In developing countries like India it is difficult to dispose
this waste because it causes different environmental
problems.
• So, by this project it is proved that fly ash aggregate
used as coarse aggregate replacement at 20% in conventional
concrete practices.
• It can be seen that the replacement percentage of fly ash
is between 5% to 20%, maximum strength is obtained at
20 %.
• Split tensile values are decreased by the replacement of
fly ash aggregate
• While doing the acid curing test it is observed that the
compressive strength of concrete replaced with fly ash aggregate
is decreased.
• By the use of fly ash aggregate we can reduce the use
of natural aggregate. Then the scarcity of aggregates can
also be reduced.
ACID ATTACK
Split Tensile Strength for 28 days
Weight Loss Acid Attack Values
Fly ash
aggregate
(%)
Average
dry weight
curing of
the cubes
(gm)
Average
dry weight
after 56
days curing
Weight
reduced
(gm)
Percentage
of weight
reduced(%
0 8310 8125 185 0.022
10 8200 7990 210 0.025
20 7895 7615 280 0.354
30 7610 7440 170 0.023
40 7449 7350 99 0.013
CONCLUSIONS
The following conclusions are made based on the comparative
analysis of conventional concrete properties of test
results to the replacement of fly ash aggregate as coarse
aggregate into the concrete test result values.
At 10% replacement level of fly ash aggregate as coarse
aggregate in concrete the compressive strength at 3, 7,14,
21, 90 days is increased as compared to conventional
concrete is 26.7%,13.6%,4.117%,2.21%,1.9% respectively.
And at 28 and 56 days the compressive strength is
decreased as 15% and12.5% respectively.
At 20% replacement of fly ash aggregate as coarse aggregate
in concrete the compressive strength for 3, 7,
14, 21, 28, 56 and 90 days is increased by 38%, 23.8%,
13%,7.46%, 5.53%, 4.85%, 3.56% respectively as compared
to conventional concrete.
At 30% replacement of fly ash aggregate as coarse aggregate
in concrete the compressive strength is increased for
3,7, 14 and 21 days is 28.7%, 16.5% ,8.27% and 2.1%.
And 28, 56, and90 days strength is decreased by 17.5%,
16.84% and 20.3% respectively as compared to conventional
concrete.
At 40% replacement of fly ash aggregate as coarse aggregate
in concrete the compressive strength for 3,7 and 14
days is increased by 21.7%, 11.58% and 1.76% respectively
and at 21, 28, 56 and90 days strength is decreased
by 4%, 22.7%, 21.56% and 24% respectively as compared
to conventional concrete.
• With increasing of fly ash aggregate as coarse aggregate
into the concrete then the workability is decreased gradually
as compared to the conventional concrete.
• By using fly ash aggregate particles into the concrete the
water absorption quantity should be increases gradually
with increasing of fly ash aggregate.
• Compressive strength of concrete is dependent on the
use of fly ash aggregate product.
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