Smt.S.R.Patel engineering college

Group Name:

Jay Patel Dixit Patel Harshil Patel

Guid By:

Mr. Amar Salariya

CONTENT

INTRODUCTION

MATERIAL

EXPREMENTAL METHOD

RESULT

CONCLUSION

REFERENCE

INTRODUCTION Fiber reinforced concrete (FRC) is a concrete made

primarily of cements, aggregates and discrete

reinforcing fibers.

Due to the presence of these uniformly dispersed

fibers, the cracking strength of concrete is increased

and the fibers acting as crack arresters.

In India the applications of FRC are very limited due

to the lack of mix proportions, and proper

understanding of its behavior. There are no specified

codes and provisions for usage of FRC.

MATERIAL CEMENT

Ordinary Portland cement of 53 grades available in

local market is used in the investigation. The cement

used has been tested for various proportions as per

IS: 4031-1988 and found to be conforming to various

specifications of IS: 12269-1987. The specific gravity

was 3.02 and the fineness was 3200 cm2/gm.

Coarse aggregate

A 10mm and 20mm coarse aggregate were used.

Crushed angular granite metal from a local source

was used as coarse aggregate. The specific gravity

was 2.71, flakiness index of 4.58 percent and

elongation index of 3.96.

Fine aggregate

River sand was used as fine aggregate. The specific

gravity and fineness modulus was 2.55 and 2.93

respectively.

Glass fibre

The glass fibers used are of

Cem-FIL Anti-Crack HD with

modulus of elasticity 72

GPa, Filament diameter 14

microns, specific gravity

2.68, length 12 mm and

having the aspect ratio of

857.1. The number of fibers

per kg is 212 million fibers.

SUPERPLASTIZER

High range water reducing/superplasticizing

admixture GLENIUM ACE 30 was used in the

expriment.

GLENIUM ACE 30 produce Rheoplastic and

Rheodynamic concrete having a low water cement

ratio.

MIX DESIGN

In the present study for

designing the mix water

cement ratios were fixed to

0.3

A M40 grade concrete was

prepared and Fiber was

added in different proportion

in this mix by 0.01%, 0.02 %,

0.03%,0.04%.

M4O mix design W/C=0.3

CEMENT

(kg/m3)

G.F

%( of

concrete)

F.A

(kg/m3)

C.A(10m

m)

(kg/m3)

C.A(20mm)

(kg/m3)

Water

(ltr/m3 )

Admixture

(ltr/m3 )

420

0

620

560

607

126

5

0.01

0.02

0.03

0.04

Cubes were cast in steel

moulds of inner dimensions

of 150 x 150 x 150mm.

Cylinders were cast in steel

moulds of inner dimensions

as 150mm diameter and

300mm height for every mix.

The beam were cast in steel

mould of size 500 x 100 x

100 mm.

CASTING

RESULT

Cube Compressive Strength

The cube testing was done by placing flat pads both top and bottom in compression testing machine. Ultimate load was noted and compressive strength was calculated at 7 days and 28 days.

Sr No % of GF 7-days

compressive

strength Mpa

28-days

compressive

strength Mpa

1 0 38.4 54.38

2 0.01 41.8 59.83

3 0.02 44.32 64.08

4 0.03 48.38 66.88

5 0.04 43.73 63.42

0

10

20

30

40

50

60

0 0.01 0.02 0.03 0.04

7-days

7-days

Co

mp

ress

ive

Str

eng

th

% of G.F

7-Days compressive strength

28-days compressive strength

0

10

20

30

40

50

60

70

80

0 0.01 0.02 0.03 0.04

28 days

Co

mp

ress

ive

Str

eng

th

% of G.F

The flexural strength was obtained

by applying the load by the equal

concentrated load at one third of

the beam. The beam was simply

supported. Testing was done in

UTM and the ultimate load was

noted.

The data obtained from the

Flexural strength test is tabulated

in the table and represented in fig ,

in which it is observed that the

values of Flexural strength of

concrete without and with Glass

Fibres at 7 and 28 days

Flexural Strength of Beam

Sr No % of GF 7-days

Flexureal

strength Mpa

28-days Flexureal

strength Mpa

1 0 14.94 16.86

2 0.01 15.06 18.45

3 0.02 16.41 19.90

4 0.03 17.21 21.74

5 0.04 15.87 19.16

28-Days Fleaxural Strength

0

5

10

15

20

25

0 0.01 0.02 0.03 0.04

28 days

Fle

axu

ral

Str

eng

th(M

pa)

% of G.F

The cylinder was placed in

universal testing machine such

that the load was perpendicular

to the axis of the cylinder and

the load at which the cylinder

split was noted and the tensile

strength was calculated.

From the experimental results

obtained, the values are noted

in the table and represented in

fig , it is observed that the

values of Split tensile strength of

concrete without and with Glass

Fibers.

Split Tensile Strength

Sr No % of GF 7-days Slit

Tensil strength

Mpa

28-days Split

Tensil strength

Mpa

1 0 3.77 4.34

2 0.01 4.02 4.95

3 0.02 4.48 5.10

4 0.03 5.02 5.65

5 0.04 4.86 5.12

28 Days Split Tensil Strength

0

1

2

3

4

5

6

0 0.01 0.02 0.03 0.04

28 days

Sp

lit

Ten

sil

Str

eng

th (

Mp

a)

% of glass Fiber

PERCENTAGE INCREASE OF COMPRESSIVE, FLEXURAL

AND SPLIT TENSILE STRENGTH OF GLASS FIBRE

CONCRETE IN COMPARISON WITH ORDINARY

CONCRETE MIXES.

Compressive Strength(%)

Flexural Strength(%)

Split Tensil Strength(%)

7-Days 26 14.72 33.16

28-Days 23.40 29.4 30.18

Conclusion

The increase in Compression strength, Flexural strength, Split tensile strength of concrete at 7 and 28 days are observed to be 25% to 30% and 25% to30% respectively when compared with 28 days strength of Plain Concrete.

It can be noted that the Compression strength, Flexural strength, Split tensile strength of concrete increases with increase in glass fibre upto 0.03% but with further increase in glass fiber the strength decreases.

It has been also observed that there is gradual increase in early strength for Compression and Flexural strength of Glass Fibre Concrete as compared to Plain Concrete, and there is sudden increase in ultimate strength for Split tensile strength of Glass Fibre Concrete as compared to Plain Concrete.

REFERENCE Naam`an A.E. 1985. Fibre Reinforcement for Concretes,

Concrete International: Design and Construction. 7(3): 21-25.

Srinivasa Rao and Seshadri Sekhar T. 2005. Strength and Durability Properties of Glass Fibre Reinforced Concrete. Proceedings of the International Conference on Recent Advances in Concrete and Construction Technology. December 7-9, SRMIST, Chennai, India. pp. 43-50.

Singh S.P, Mohammadi Y and Kaushik S.K. 2005. Flexural Fatigue Analysis of Steel Fibrous Concrete Containing Mixed Fibres. ACI Mater. J. 102(6): 438-444.

GAMBHIR, M.L (Fourth Edition). ―Concrete Technology.

SHETTY, M.S (2012 edition). ―Concrete Technology