1) The document examines how replacing cement and fine aggregates with mineral admixtures like fly ash and bottom ash at different percentages, along with the addition of steel and carbon fibers, affects the compressive strength of concrete when subjected to high temperatures. 2) Cubes of concrete with various replacement levels were cured for 28 days and then exposed to 1000C temperature for 1 hour, after which compressive strength was tested. 3) Results showed that compressive strength decreased with temperature exposure but the decrease was less as the fly ash and bottom ash replacement levels increased, with up to a 29.89% lower strength reduction at 50% replacement compared to normal concrete. This is because the mineral admixtures have better heat

1. IDL - International Digital Library Of
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International e-Journal For Technology And Research-2017
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Abstract— Present paper reflects that how temperature
affects the compressive strength of the concrete in which the
cement and fine aggregates replaced with a mineral
admixture like fly ash and bottom ash with a constant
percentage of steel fibres and carbon fibres to the volume of
concrete respectively. In this investigation , concrete of M25
grade is tried using fly ash as partial replacement for cement
for cement at 0%,10%, 20%, 30%, 40%, 50% and bottom as
partial replacement for fine aggregates at 0%, 10%, 20%,
30%, 40%, 50% with addition of 1% of steel fibres and 0.5%
of carbon fibres to the volume of concrete. The effect of the
temperature on the compressive strength of SFRC and CFRC
was studied using a specimen of size 150mm X 150mm
X150mm cubes. After 28 days of curing the specimens were
kept in a oven at 1000
C of temperature for 1 hour. The result
obtained for SFRC and CFRC were compared with the same
grade normal concrete results which was having same W/C
ratio.
Keywords: Constant Temperature, Conventional
Concrete, Compressive Strength, SFRC – Steel Fiber
Reinforced Concrete , CFRC – Carbon Fiber Reinforced
Concrete , W/C – Water Cement ratio.
INTRODUCTION
In construction activities concrete is the most
commonly used material. When hardened it becomes strong
and durable but it will be plastic and malleable in its fresh
state. It is good in compression but weak in tension. Its
strength can be achieved in tension by providing
reinforcement. The aggregates are the major components of
concrete. A broad range of environment and social
consequences are produced by the use of cement and
manufacture. The consequence is both harmful and
acceptable. Production of cement causes pollution due to gas
emissions. Attempts have been done to reduce green house
gas. So by substituting conventional clinker with industrial
by products like fly ash and bottom ash cement industries
have taken actions. The use of industrial wastes is taking
importance as additives, by this they increase strength,
density and it reduces its impact on environment.
Since1900 the use of fiber to concrete has been experimented.
Asbestos
fiber were used to concrete in the beginning of 20th
century. And in middle, I mean in 1950 the concept of
composite of materials came into action. Fibre reinforced
concrete was one among. The overall thinking is to get better
strength of concrete. To focus on the strength of concrete the
steel fiber and carbon fibers were added. By this the strength
of concrete can be achieved. The backbone of modern
civilization is energy. The major source of energy is electric
power from thermal power station. 70% of the energy
electricity is being generated by burning fossil fuels. Out of
70% nearly61% is produced by coal fired plants. This results
nearly 100 tons of ash produced per year. This ash can be
disposed off either dry or wet to a near by open area. Or by
grounding both bottom ash and fly ash we can dispose. Or
mixing with water we can pump it into artificial lagoon or
dumping into yards. Through there is a report that will cause
environmental pollution. Due to this reason the experiment
research and investigating is on. The effect of use of bottom
ash as a replacement of fine aggregates. To avoid the
pollution bottom ash came into use.
PROBLEM DEFINITION
In this present experimental work, the properties of
concrete are thoroughly studied for M25 grade with fibres as
reinforcing materials. In addition to this some of the
industrial wastes (fly ash7&bottom6ash) obtained5from
thermal5power plant having a little cementitious7properties
are substituted with cement and fine aggregate respectively.
Both fly ash and bottom ash are replaced with cement and
sand with following variations of 0%, 10%, 20%, 30%, 40%
and 50% by weight of cement and sand respectively. The
fibres used for this study are steel and carbon at constant
percentage of 1% and 0.5% volume of concrete respectively.
Temperature effect on the compressive strength of fiber
reinforced concrete was studied in this work.
Temperature Effect on High Performance Concrete with
Fibres
KUMUDA V
Assistant Professor of Civil Engineering Department, SITAR

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METHODOLOGY
The temperature effect of SFRC and CFRC was
determined at 28 days by using cubes of size 150 X 150 X
150mm
IMPLEMENTATION
This test was conducted to determine the effect of
temperature on strength of concrete. 150mmx 150mm
x150mm cubes are used to find out the compressive strength
affected by temperature. After demoulding the cubes from
moulds, it has kept for curing for 28 days respectively.
After0curing time the cubes5taken out from the curing tank
and kept that cubes in oven for one hour at 1000
C, the
temperature was kept constant for complete experiment.
After oneghour take out the cubes from oven, let it to be cool.
After sometimes the compressive strength was tested and
value is recorded. The compressive strength is recorded for
28 days.
Loss in compressive strength
due to temperature effect = (fc – fc
l
) / fc x 100
Where
fc = Cube Compressive strength in N/mm2
fc
1
= Cube Compressive strength after temperature effect in
N/mm2
RESULTS
Temperature effect of normal concrete and fibre
reinforced concrete with additives was determined by using
cubes of size 150mm x150mm x 150mm at constant
temperature. The values of compressive strength affected by
temperature is tabulated in Table.1.1 and 1.2 and variation of
strength is as shown in Fig.1.1 and 1.2.
Table.1.1
Replacemen
t of FA &
BA in %
with 1% of
Steel Fibres
Initial
Compressive
Strength in
N/mm2
Final
Compressive
Strength in
N/mm2
Loss in
Strength
of SFRC
in %
CC 37.21 33.86 9.00
0%
38.33 34.88 9.12
(With fibres)
10% 39.54 35.98 9.21
20% 39.01 35.50 8.99
30% 35.55 32.35 9.10
40% 32.00 29.44 8.89
50% 28.88 26.25 8.56
Table.1.2
Replacemen
t of FA &
BA in %
with 0.5% of
Carbon
Fibres
Initial
Compressive
Strength in
N/mm2
Final
Compressive
Strength in
N/mm2
Loss in
Strength
of CFRC
in %
CC 38.22 35.16 8.00
0%
(With fibres)
38.53 34.35 7.98
10% 38.87 34.75 7.15
20% 39.25 36.11 8.00
30% 38.25 35.19 8.12
40% 31.55 29.05 7.92
50% 27.11 24.94 7.95

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Fig.1.1
Fig.1.2
CONCLUSION
1. A gradual decrease of compressivehstrength was
observed for both the fibres, but the temperature
effect was found to be decreasing as the FA and BA
percentage was increasing.
2. For SFRC at 50% replacement there 22.50%
decrease in temperature effect when compared to
CC and similarly 29.89% reduction was obtained
for same % of CFRC.
3. This due to the reason that FA and BA are industrial
by-products which already have more heat resisting
power than conventionalkconcrete and hence as the
FA and BA percentage was increasing the
temperature effect was found to be decreasing.
4. Temperaturekeffect results shown that there is
consistence decrease in % loss of strength as % of
FA and BA goes on increasing. More strength
reduction in case of SFRC compare to CFRC.
SCOPE FOR FURTHER STUDY
 Temperature effect on concrete can be finding out by
varying the temperature values.
 Other industrial by products can be use as
replacement of constituent materials of concrete.
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