It is going to study the strength behavior of SCC with glass fibers.Where In the first phase, SCC mix of M30 grade was developed without glass fibers and In second phase, SCC mix of M30 grade was developed with different proportions of glass fibers. The different strength properties like Compressive strength, Flexural strength, Tensile strength were studied for the samples of 7 days and 28 days curing.
2. ABSTRACT
The development of Self Compacting Concrete is
described by the Concrete Society and Building Research
Establishment as a quiet revolution in the construction
industry resulting in massive usage of SCC worldwide.
Incorporation of fibers has further enhanced the strength and
durability of the properties of SCC. The fibers include steel,
nylon, poly-propylene, glass, carbon and so on.
In the present work which is experimental, it is going
to study the strength behavior of SCC with glass fibers. The
present project consist of two phases. In the first phase, SCC
mix of M30 grade was developed without glass fibers and In
second phase, SCC mix of M30 grade was developed with
different proportions of glass fibers. The different strength
properties like Compressive strength, Flexural strength,
Tensile strength were studied for the samples of 7days and 28
days curing.
3. WHAT IS SCC ?
Its a high performance material which
flows under its own weight without
requiring vibrators to achieve
consolidation by complete filling of
formworks even when access is
hindered by narrow gaps between
reinforcement bars
4. WHY SCC IS USED?
It has proved beneficial economically because of a
number of factors as noted below (Krieg, 2003 and EFNARC,
2002):
Faster construction
Reduction in site manpower
Easier placing
Uniform and complete consolidation
Better surface finishes
Improved durability
Increased bond strength
Greater freedom in design
Reduced noise levels, due to absence of vibration
Safe working environment.
5. CHARACTERISTICS OF SCC
A concrete mix can only be
classified as SCC if the requirements
for all the following three workability
properties are fulfilled (EFNARC,
2002):
Filling ability
Passing ability
6. FIBERS INCORPORATED SCC
A Composite material consisting of
mixtures of Self Compacting Concrete
and Discontinuous, discrete,
uniformly dispersed suitable fibers.
8. CEMENT - ORDINARY PORTLAND CEMENT
Selection of the type of cement depends on the
overall requirements for concrete, such as strength
and durability. Here 53grade OPC is selected.
REQUIREMENTS FOR GLASS
FIBER INCORPORATED SCC
9. FILLER – FLY ASH
Materials, such as fly ash, blast furnace
slag, ground glass, limestone powder, silica
fume, etc, are commonly used as filler for
producing SCC. Here Fly ash is selected.
11. SUPER PLASTICIZER – Conplast
SP430
The main purpose of using a super plasticizer is
to produce flowing concrete with very high slump
that is to be used in heavily reinforced structures
and in places where adequate consolidation by
vibration cannot be readily achieved.
12. VISCOSITY MODIFYING AGENT –
GLENIUM STREAM 2
The Viscosity modifying agent is required to :
1. Increase homogeneity
2. Reduce segregation
3. Increase the volume of paste
4. Increase the stability of flow
13. GLASS FIBER - Cem-FIL anti-crack
glass fibers
The addition of Glass fibers in SCC can
improve
Ductility
Post crack resistance
Energy absorption capacity
Bleeding resistance
Properties of Glass fiber used
Length : 12 mm
Diameter : 14 micron
Specific Gravity : 2.6
No of fibers : 212 million/kg
14. MIX DESIGN
It is the process of selecting suitable ingredients of
concrete and determining there relative proportions with the
object of producing concrete of certain minimum strength
and durability as economically as possible finding the
proportions, we preferred ACI method for design the mix.
ACI Method of Design for M30Concrete
CEMEN
T
Fly Ash FA CA W/P SP VMA
318.89 136.67 826.92 871.2 197.58 4.5 0.37
1 0.43 2.59 2.73 0.43 1% 0.08%
PROCEDURE FOR THE
MANUFACTURING OF GLASS FIBER
INCORPORATED SCC
15. PROGRAM OF MIX
Experimental test were carried out
on series of mixes to evaluate the
workability and strength
characteristic based on the following
mix ratios.
CC – Cement + F.A + C.A + Water
SCC – CC + Fly ash + Super plastizer + VMA
SCC1 – SCC + 0.02 % of Glass Fiber
SCC2 – SCC + 0.03 % of Glass Fiber
SCC3 – SCC + 0.04 % of Glass Fiber
17. COMPRESSION TEST
It is the test done to know the concrete
compressive strength. For this purpose
concrete cube of 150mm*150mm*150mm
specimens are tested in laboratory.
18. MIX
7 days Compressive Strength (Mpa)
% of
Glass
Fiber
Specimen
I
Specimen
II
Specimen
III
Average
CC - 28 25.8 27.5 27.09
SCC - 27.1 26.67 26.2 26.66
SCC1 0.02% 28 27.1 26.2 27.1
SCC2 0.03% 28.89 28.4 27.5 28.8
SCC3 0.04% 26.67 26.72 28 26.96
Compressivestrength(Mpa)
19. MIX 28 Days Compressive Strength (Mpa)
% of Glass
Fiber
Specimen I Specimen
II
Specimen
III
Average
CC - 32 31.1 33.3 32.1
SCC - 31.56 33.78 32 32.45
SCC1 0.02 % 32.4 35.1 32.8 33.46
SCC2 0.03 % 32.88 35.56 33.33 33.92
SCC3 0.04 % 31.56 33.33 35 33.3
Compressivestrength(Mpa)
20. FLEXURAL TEST
It is used to determine the flexural modulus or
flexural strength of a material. Flexural strength is
the maximum stress at the outermost fiber on
either the compression or tension side of the
specimen. For this purpose the concrete beam of
150mm*150mm*700mm specimens are used in
laboratory.
21. MIX 28 Days Flexural Strength (Mpa)
% of Glass
Fiber
Specimen I Specimen II Specimen III Average
CC - 7.6 7.4 6.6 7.2
SCC - 7.2 8 5.6 6.9
SCC1 0.02 % 6.4 6.8 8.8 7.33
SCC2 0.03 % 7.6 7.2 9.2 8.0
SCC3 0.04 % 8 6.8 8.6 7.8
Flexuralstrength(Mpa)
22. SPLIT TENSILE TEST
It is a test on concrete cylinder to
determine the tensile strength of concrete.
For this purpose the concrete cylinder of
150mm diameter and 300mm long
specimens are used in laboratory.
23. MIX 28 Days Split Tensile Strength (Mpa)
% of Glass
Fiber
Specimen I Specimen II Specimen III Average
CC - 2.12 2.83 2.68 2.54
SCC - 2.83 2.26 2.59 2.59
SCC1 0.02 % 2.56 2.69 2.41 2.55
SCC2 0.03 % 2.68 2.4 2.83 2.64
SCC3 0.04 % 2.55 1.98 3.12 2.54
SplitTensileStrength(Mpa)
24. CONCLUSION
With the addition of different volume of glass fiber
from 0.02% to 0.04% and with 1% of super plasticizer &
0.8% of VMA by the weight of cement, the strength
behavior of Glass Fiber Self Compacting Concrete have
been investigated.
The maximum compressive strength of 33.92 N/mm2
fibers 0.03% of concrete, improvement is 5.66 %
The maximum split tensile strength of 2.64 N/mm2
fibers 0.03% of concrete, improvement is 3.94 %
The maximum flexural strength of 8.0 N/mm2
fibers
0.03% of concrete, improvement is 11.12 %
