Preliminary Studies on Hpc’s for Pavements
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Transcript of Preliminary Studies on Hpc’s for Pavements
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PRELIMINARY STUDIES ON
HPCs FOR PAVEMENTS
BY
PANKAJAKSHI M GI-semester M.E., (Civil)
(Major: Highway Engineering)
Under the guidance ofDr. M.S. AMARNATH
Professor
Bangalore University, Bangalore-560 056
20122013.
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HIGH PERFORMANCE CEMENT
CONCRETE
HPCC can be defined as concrete with
enhanced properties such as higher
compressive, higher flexural strength, lowerpermeability, lower heat generation, greater
resistance to alkali silica reaction and greater
resistance to sulphate attack because of theaddition of admixture.
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NEED FOR THE STUDY
Drastical increase in traffic playing on the
surface, demanding better and stronger
pavement.
Need for exploring pavement alternatives with
improved strength properties
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Objective
To determine the properties of ingredient of
High performance cement concrete
To arrive at the mix proportion of HPCC
(Silica fume concrete, High volume fly ash
concrete )
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EXPERIMENTAL
INVESTIGATION
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Some special types of high
performance cement concrete
Silica fume concrete
High volume fly ash concrete
Ground granulated blast furnace slag concrete
Fiber reinforced concrete
Silica fume concrete is defined as a mix that
contains replacement of cement by Silica fume.Silica fume concrete can reach the same or greaterdesign strength as normal concrete.
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MATERIALS USED IN THE
STUDY Cement- 53grade cement conforming to IS: 12269-1987.
Fly ash - Class F fly ash used is obtained from Raichurthermal power station.
Fine aggregate- Locally available river sand is used as fine
aggregate. The properties of the fine aggregates aredetermined by conducting tests as per IS: 2386-part 3 and IS383-1970.
Coarse aggregates - Locally available crushed granitecoarse aggregates are used in this study the tests for
physical properties on coarse aggregates are conducted asper IS: 383-1970.
Super-plasticizer- Rheo Build-816 and conplast 432sp
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TESTS ON CEMENT
SL. No Test ResultsRequirements as per
IS: 12269-1987
1. Normal Consistency 37% -
2. Initial Setting Time 50 minShall not be less
than 30 minutes
3. Final Setting Time 275 minShall not be more
than 600 minutes
4. Specific Gravity 3.12 2.99-3.15
5.Fineness (sieve
analysis)3%
Should be less than
10 % of its weight
6.Compressive
strength for 56 daysResults awaited Min53 MPa
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TESTS ON FLY ASH
SL No Test
Results as per
suppliers report
Requirements as per IS
3812-2003
1. Normal Consistency 27% Not Specified
2. Specific Gravity 2.46 Not Specified
3. Fineness 4% Should be less than 7 % of
its weight
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Grading of Fine Aggregate Confirming
to Zone II of IS 383-1970
0
20
40
60
80
100
120
0 2 4 6 8 10 12
Sieve size, mm
PercentPassi
ng
IS Code Lower
Limit
IS Code Upper
Limit
Results
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TESTS ON AGGREGATES
Tests conducted as per IS:2386 part-3 Results
Specific gravity 2.58
Bulk density 1.55 g/cc
Moisture content 0.6%
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Sl No Property Test resultsRequirements as per
IS: 383-1970
1.Aggregate Impact
Value, %23.80
30% max for wearing
surfaces
2. Abrasion Value % 26.80
30% max for wearing
surfaces
3.Aggregate Crushing
Value %24.86
30% max for wearing
surfaces
4.Combined EI &FI
Values,%29.38 30% max
5 Specific Gravity 2.60 -
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DESIGN OF MIX PROPORTION
In the present study five mixes are used. ACI method of
mix design is used for arriving at the mix proportions
for all the mixes.
M1 - 1:1.85:2.65
M2 - 1:1.29:2.80
M3 - 1:2.00:2.50
The mix proportion for Conventional M40 grade
Concrete (M1), High volume fly ash concrete(M2), and
Silica Fume Concrete (M3).
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Cube compressive strength
The cubes are casted as IS :516-1999
Conventional M40 grade Concrete
High volume fly ash concreteSilica Fume Concrete
The testing of specimen is done for 56 days .-the
results are being awaited.
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