preliminary studies on hpc’s for pavements

8/11/2019 Preliminary Studies on Hpcs for Pavements

1/17

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.


2/17


3/17

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.


4/17

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


5/17

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 )


6/17

EXPERIMENTAL

INVESTIGATION


7/17

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.


8/17

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


9/17

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


10/17

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


11/17

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


12/17

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%


13/17

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 -


14/17

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).


15/17

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.


16/17


17/17

preliminary studies on hpc’s for pavements

Documents