INFLUENCE OF FLY ASH AND RUBBER IN CONCRETE
(M20 GRADE) BY (BATCH-7)
ABHISHEK.K(11241A0132)
REDDY
PRASHANTH(12245A0117)
BHARADWAJ.S(11241A01A9)
MD.FAISAL
FARZAN(11241A0195)
NITHIN REDDY.B(11241A0166)
PROJECT GUIDE:
Mr. V.MALLIKARJUNA REDDY
DEPARTMENT OF CIVIL ENGINEERING
ABSTRACTThe results of an experimental investigation to study the effects of partial
replacement of cement with flay ash in rubberized concrete. The percentage of rubber used in this study was 5% replaced with coarse aggregate and fly ash varies from 0-20% were replaced with cement in conventional concrete. One size of tire rubber chips are used of about 10mm.The mix design was targeted to be M20 grade of concrete. The mix proportion of concrete was 1:1.5:3 with water cement ratio of 0.45.The fresh and hardened properties of rubberized concrete produced at two different replacements ratios of fly ash compared to the conventional concrete without rubber and fly ash .The test result indicate that there was a small reduction in the strength with the 5% replacement in rubber content as compared with the conventional concrete. However, the increase of fly ash from 10% to 20% improved the mechanical properties of rubberized concrete. This study explores the effects of rubber particles on some properties of concrete.
Key words: Fly ash, rubber, coarse aggregate, fine aggregate, cement
INTRODUCTION
Concrete is one of the main component in any
concrete masonry construction
Concrete composes of cement ,fine aggregate,
coarse aggregate
Researches have shown that these components
can be replaced to some extent by fly ash,
rubber, plastic, stone dust etc..,
Waste or worn out rubber can be used as
replacement to the coarse aggregate to about
5% instead of disposing it out as waste material
(from "influence of fly ash on mechanical
properties of rubberized concrete” by
M.Mishra,K.C.Panda)
Fly ash to be replaced to about 20% of cement.
Studies are made on both fresh as well as
hardened properties of rubberized concrete and
compare with normal concrete.
NEED FOR REPLACEMENT
Growth of cement usage leads to the greater
production of CO gas which is one of the major
cause for GLOBAL WARMING2
Excavation of sand and stones from river banks is
one of the main cause for disasters caused due to
FLOODS
REPLACING MATERIALS Materials like rubber, fly ash, stone dust, waste
materials, etc.., Can be used to replace
aggregates and cement
But these materials cannot be replaced fully but
they are partially replaced to about 5% to 20%
(by “influence of fly ash on mechanical
properties of rubberised concrete” by
M.Mishra,K.C.Panda).
Their strength would not be as high as the
traditional concrete but this can be used for
domestic concrete works.
USING WASTE TYRE RUBBER IN CONCRETE
The disposal of waste or worn out tyres have
become a global problem
It is a potential fire hazard and as well as health
risks due to growth of mosquitoes breed in
stagnant water which accumulates in tyres
Rubber from scrap tyres is one of the most
recent waste materials investigated for its
potential use in construction industry
MATERIALS USEDFLY ASH Fly ash is finely divided residue obtained from
the combustion of powdered coal
CLASS F fly ash from thermal power plants
collected and is used for about 5%to 20%to
replace cement.
10% and 20% replacement of cement
specimens have been prepared.
WASTE TYRE RUBBER
Bike tyre is trimmed into pieces of about 10 mm
size by means of wood cutter and by using knifes.
This rubber would be used to replace for about 5%
with course aggregate(as per “influence of fly ash
on mechanical properties of rubberized concrete”
by M.Mishra,K.C.Panda.)
Two waste bike tyres from nearby puncher shop
has been collected for the project
PROCESS OF CUTTING RUBBER
CEMENT Ordinary Portland cement (53 grade) Ultratech
cement is used
COARSE AGGREGATE
Normal coarse aggregate of 20 mm size is used
FINE AGGREGATE River sand which is available locally is used as
fine aggregate for entire process
GRADE OF CONCRETE The mix is targeted for M20 grade(Nominal
mix).
WATER-CEMENT RATIO Water-cement ratio is be taken as 0.45.
SPECIMENS PREPAREDCONCRETE MIX PROPORTION
MIX IDENTITY NO. OF SPECIMENS
Concrete mix with 100%NCA+100%cement+0%rubber+ 0%fly ash
CR0F0 6
95%NCA+90%cement+5%rubber+10%fly ash
CR5F10 6
95%NCA+80%cement+5%rubber+20%fly ash
CR5F20 6
QUANTITY OF MATERIALS USEDMIX IDENTITY(kg)
NO. OF BLOCKS
CEMENT(kg)
SAND(kg)
NORMAL COARSE AGGREGATE(NCA)(kg)
RUBBER CHIPS(kg)
FLY ASH (kg)
WATER(ml) (w/c ratio =0.45)
CR0F0 6 10 15 30 -- -- 4500
CR5F10
6 9 15 28.5 1.5(5% replacement of NCA)
1(10%replacement to cement)
4500
CR5F20
6 8 15 28.5 1.5(5% replacement of NCA)
2(20% replacement to cement)
4500
TESTS CONDUCTED
FRESH CONCRETE TEST
Slump cone test
HARDENED CONCRETE TEST
Compressive strength test
Slump cone test
TEST RESULTS
S.NO
MIX IDENTITY SLUMP
VALUE(mm)
1 CR0F0 45
2 CR5F10 40
3 CR5F20 43.5
Slump cone test values
Slump chart
CR0F0
CR5F10
CR5F20
3.7 3.8 3.9 4 4.1 4.2 4.3 4.4 4.5 4.6
SLUMP
SLUMP
Compressive strength test
MIX PROPORTION MIX IDENTITY
AVERAGE COMPRESSIVE STRENGTH
7 DAYS 28 DAYS
Concrete mix with 100% NCA
+ 100% Cement + 0% Rubber chips + 0% FA
CR0F0 17.96 23.70
Concrete mix with 95% NCA + 90% Cement + 5% Rubber chips + 10% FA
CR5F10 15.23 19.04
Concrete mix with 95% NCA + 80% Cement + 5% Rubber chips + 20% FA
CR5F20 18.09 23.80
Compressive strength test results
CR0F0 CR5F10 CR5F200
5
10
15
20
25
7 days
28 days
Compressive strength variation for 7 &28 days
(N
/mm
^2)
OBSERVATIONS
The workability decreases when we replace
coarse aggregate with 5% rubber and cement
by 10% fly ash
Again the workability increases as greater
percentage of fly ash increases the workability
The strength of concrete decreases with
increase in percentage of fly ash first and again
increases as the percentage of fly ash increases.
REFERENCES/LITERATURE “Influence of fly ash on mechanical properties
of rubberized concrete” by M.Mishra,K.C.Panda. “Rubber tyre particles as coarse aggregate” by
N.N.Eldin ,A.B.Senouci ,journal of materials in civil engineering,vol-5,pp.478-96.
I.B.Topcu,(1995),”The properties of rubberized concrete", cement concrete research,vol.25(2),pp.304-310.
A.Yilmaz&N.Degirmenci,(2009),”Possibility of using waste tyre rubber and fly ash with Portland cement concrete as construction materials", waste managements,vol29(5),pp.1541-1546.
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