Glass Fibre Reinforced Concrete is recent introduction in the field of concrete technology. The present day world is witnessing the construction of very challenging and difficult Civil Engineering Structures. Concrete being the most important and widely used material is called upon to possess very high strength and sufficient workability properties. Concrete the most widely used construction material has several desirable properties like high compressive strength, stiffness, durability under usual environmental factors. At the same time concrete is brittle and weak in tension. Efforts are being made in the field of concrete technology to develop high performance concretes by using fibres and other admixtures in concrete up to certain proportions. To improve the concrete properties, the system was named alkali resistance glass fibre reinforced concrete in the present view the alkali resistance glass fibre has been used. In the present experimental investigation the alkali resistance Glass Fibres has been used to study the effect on compressive strength on M30 grades of concrete.

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International Journal of Research and Innovation (IJRI)
International Journal of Research and Innovation (IJRI)
EXPERIMENTAL STUDY ON THE COMPRESSIVE STRENGTH OF GLASS FIBRE
CONCRETE
Durisetti Praveen1
, M.Rajshekar Reddy2
, K. Mythili3
1 Research Scholar, Department of Civil Engineering, Aurora's Scientific Technological and Research Academy, Hyderabad,India.
2 Assistant professor , Department of Civil Engineering, Aurora's Scientific Technological and Research Academy, Hyderabad,India.
3 Associate professor , Department of Civil Engineering, Aurora's Scientific Technological and Research Academy, Hyderabad,India.
*Corresponding Author:
Durisetti Praveen,
Research Scholar, Department of Civil Engineering,
Aurora's Scientific Technological and Research Academy,
Hyderabad, India.
Published: November12, 2015
Review Type: peer reviewed
Volume: II, Issue : IV
Citation: Durisetti Praveen, Research Scholar (2015)
"EXPERIMENTAL STUDY ON THE COMPRESSIVE STRENGTH
OF GLASS FIBRE CONCRETE"
INTRODUCTION
Concrete is one of the most versatile building materials. It
can be cast to fit any structural shape from a cylindrical
water storage tank to be rectangular beam or column in
a high-rise building Conventional concrete is composed
of aggregates (sand, gravel...), cement, water and ad-
mixtures where it is necessary. Concrete with a uniform
structure, good plasticity and the ability of deformation
by form, sound and thermal insulation and the capability
of quality development by admixtures, is getting more and
more popular in structural industries every day. Consid-
ering all the concrete benefits, we cannot deny its weak-
nesses. The first fundamental problem of concrete is low
tensile strength which is approximately 10%-15% of its
compressive strength nevertheless this crucial problem
can be solved by the reinforcement.
In addition, reinforcement must be calculated to prevent
brittle failure in order to have plastic behavior; the maxi-
mum standards must be respected to prevent corrosion
of reinforcement.
Fibre reinforced concrete
Fiber reinforced concrete is relatively new constructional
material developed through extensive research and devel-
opment work during the last three decades. The fibers
are randomly oriented, discrete, discontinuous elements
made from steel, glass or organic polymers (Synthetic
Fibers). The fibers are introduced in the matrix as ‘micro
reinforcement’ so as to improve the tensile strength by
delaying the growth of cracks, and to increase the tough-
ness by transmitting stress across a cracked section so
that much larger deformation is possible beyond the peak
stress. The prime objective of usual natural fibers such
as straw in brick making has always been to alter and
improve the properties of the brittle matrix. When two dif-
ferent kinds of materials with contrasting properties of
strength and elasticity are combined together, they realize
a great portion of the theoretical strength of the stronger
component, and these combined materials are called two-
phase materials.
Types of Fibres
Fibres are classified into two categories namely hard in-
trusion and soft intrusion. Fibres having a higher elastic
modulus than the cement matrix can be termed as hard
intrusion and fibers having a lower elastic modulus are
called as soft intrusion.
Steel Fibres
Glass Fibre
Synthetic Fibres
Abstract
Glass Fibre Reinforced Concrete is recent introduction in the field of concrete technology. The present day world is
witnessing the construction of very challenging and difficult Civil Engineering Structures. Concrete being the most
important and widely used material is called upon to possess very high strength and sufficient workability properties.
Concrete the most widely used construction material has several desirable properties like high compressive strength,
stiffness, durability under usual environmental factors. At the same time concrete is brittle and weak in tension. Efforts
are being made in the field of concrete technology to develop high performance concretes by using fibres and other ad-
mixtures in concrete up to certain proportions. To improve the concrete properties, the system was named alkali resist-
ance glass fibre reinforced concrete in the present view the alkali resistance glass fibre has been used. In the present
experimental investigation the alkali resistance Glass Fibres has been used to study the effect on compressive strength
on M30 grades of concrete.
GFRC can be used wherever a light, strong, weather resistant, attractive, fire resistant, impermeable material is re-
quired. It has remarkable physical and mechanical assets. GFRC properties are dependent on the quality of materials
and accuracy of production method. Despite its wide range applications in architecture the chief goal is to show and
introduce important structural purposes, for instance: anti rust characteristics of GFRC made it a good replacement for
water and sewer pipes and tanks, a thin protective layer of GFRC on concrete beams and columns can increase their
durability in fire as well as low temperatures and generally it is a good replacement for susceptible materials in difficult
environments.
1401-1402

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International Journal of Research and Innovation (IJRI)
Carbon Fibres
Acrylic Fibres
Aramid Fibres
Nylon Fibres
Polyester Fibre
Polyethylene Fibre
Polypropylene Fibres
Natural Fibres
Unprocessed Natural Fibres
Processed Natural Fibres
Development of fibre reinforced concrete
Reinforcement, which could be moulded into shaped dur-
ing the casting of concrete, or even included in the origi-
nal mix, has long been the aim of many researches. The
quest for new material as substitute for the existing ma-
terial or finding a new or better use of known materials
is very much accelerated but the socio-economic neces-
sities. It is well-established fact that generally a material
in fibrous form has much higher strength than in bulk
form. Composite materials are being developed are used
increasingly as they have advantaged in combining the
merits of individual components and obviating their indi-
vidual shortcomings as much as possible. Based on these
concepts, a great amount of effort is currently put into
research on use of thin, high strength fibre of steel, glass,
plastic etc, in concrete mix.
General requirement of fibre reinforced concrete
The most exploitable form of the fibre composites will be
in the use of short discontinuous fibers in either two-
dimensional planner orientation as in thin section like
shells, folded plate, etc, or in the random three directions
as in thick sections like beams etc. Generally, econom-
ic consideration will dictate the choice and volume per-
centage of the fibres to be used. The basic requirement
of fibres for improving the properties of concrete is high
tensile strength elastic modulus, adequate extensibility,
a good bond at the interface and good chemical stability.
The fibres should be capable of withstanding the stresses
for a long period i.e, they should be durable. The tensile
strength of fibers may not be critical, if the composite fails
by the fiber pullout, but if the fibres yield on fracture,
then their strength plays an important role in determin-
ing the strength capability of the composite.
Role of fibres
The role of fibres is especially to arrest any advancing
crack by applying pinching force at the crack tips, thus
delaying their propagation across the matrix. The ul-
timate cracking strain of the composite is increased to
many times greater than that of the unreinforced matrix.
Unlike the conventional bars, the discrete fibres are dis-
persed uniformly throughout the matrix hence they can
be more beneficial in arresting the growth of any advanc-
ing crack.
Introduction to glass fibre reinforced concrete (GFRC)
Glass fibre is a material consisting of numerous extremely
fine fibres of glass. Glass fibre is commonly used as an
insulating material. It is also used as a reinforcing agent
for many polymer products to form a very strong and light
fibre reinforced polymer (FRP) composite material called
glass-reinforced plastic (GRP), popularly known as “fibre
glass”. Fiberglass is a light weight, extremely strong, and
robust material. Although strength properties are some-
what lower than carbon fibre and it is less expensive. Its
bulk strength and weight properties are also very favora-
ble when compared to metals, and it can be easily formed
using moulding processes.
Glass fibre
Normal or E-glass is affected in the presence of alkalin-
ity where as alkali-resistant glass fibre by trade name
“CEM-FIL” has been developed and used. Cem-Fil alkali
resistant (AR) glass fibres have been in use for 40 years in
more than 100 countries worldwide to create some of the
world’s most stunning architecture while offering strong
and durable performance in widely varying cement and
mortar based applications, including flooring, renders,
top screeds, tunnels, utility poles, etc. Cem-FIL AR glass
fibres are unique as a concrete reinforcement. Cem-Fil
fibres have the same specific gravity as the aggregates,
so assured fibre dispersion is easier to achieve than with
other fibres.
CEM-FIL glass fibre
The CEM-FIL glass fibres contribute to crack control, per-
meability and flexibility. This improves the durability of
concrete.
Control of cracking
CEM-FIL glass fibres prevents the shrinkage cracks de-
veloped during curing making the structure / plaster /
component inherently stronger. Further when the loads
imposed on concrete suddenly cause cracks and propa-
gate rapidly. Addition of CEM-FIL glass fibres in concrete
and plaster prevents / arrests such cracks.
Need for the present work
The advent of high strength concrete has helped construc-
tion activity in many ways for example to build high rise
buildings by reducing column sizes and increasing avail-
able space and to put the concrete into service at much
earlier age etc. concrete the most widely used structural
material in the world is prone to cracking for a variety of
reasons. These reasons may be attributed to structural or
environmental factors, but most of the cracks are formed
due to inherent weakness of the material to resist tensile
forces, when it shrinks and it is restrained, it will crack.
The randomly oriented fibres assist in controlling the
propagation of micro-cracks present in the matrix, first
by improving the overall cracking resistance of the matrix
and later by bridging across even smaller cracks formed
after the application of load on to the member, thereby
preventing their widening into major cracks. Thus proper
introduction of fibres in concrete improves both mechani-
cal properties and durability.
Scope of present work
1. Review and research of glass fibres
2. Construct the concrete specimen by twenty seven cubes
by partial replacement of cement by fibre with different
percentages (0.8%, 1.2%, 1.5%) by weight of cement.
3. Investigation and laboratory testing on concrete cube.

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4. Analysis the results and recommendation for further
research work.
Summary
In this chapter, theoretical study on ordinary Portland ce-
ment, Glass Fibre Reinforced Concrete and materials and
classification. Also the scope and objective of the present
study are discussed. Based on the objective of the pre-
sent study, research papers were collected and studied.
The review of research papers is discussed in the next
chapter.
LITERATURE REVIEW
The applications of Glass Fibre Reinforced Concrete are
getting wider day by day. This research is going on in
many countries and some reviews are as follows:
Shah and Naaman (1976) carried out an investigation to
determine the tensile, flexural and compressive strengths
of concrete specimens reinforced with different lengths
and volumes of steel and glass fibres. The tensile or flex-
ural strengths of reinforced specimen was at most two to
three times that of plain concrete while the corresponding
strains or deflections were as much as ten times that of
plain concrete. The stresses and strain at first cracking
were not significantly different from those of plain con-
crete. Extensive micro cracking were observed on the sur-
face of failed flexural specimens indicating a significant
contribution of the matrix even after the first cracking.
For steel fibre reinforced specimens, the peak loads and
deformations appear to be linearly related to the fibre pa-
rameter: Vf L/D. after failure, steel fibres pulled out while
most of the glass fibres broke.
Swamy and Stravrides (1979) carried out an investiga-
tion to determine the influence of fibre reinforcement on
restrain shrinkage and cracking of concrete. A ring type of
restrain shrinkage test is reported to demonstrate the abil-
ity of short, discrete fibres such as polypropylene, glass,
and steel to control cracking and resist tensile stresses
arising from restrained shrinkage. Three series of free and
restrained shrinkage tests are reported with different ma-
trices, types of fibres, and fibre contents. It is shown that
the presence of fibres exercises a clear but small restraint
to free shrinkage, and reduces drying shrinkage by up
to 20 per cent. When shrinkage is restrained, fibre rein-
forcement delays the formation of the first crack, prevents
sudden failure observed with unreinforced matrices, en-
ables the composite to suffer multiple cracking without
failure, and reduces crack widths substantially. The fibre
reinforced specimens were able to resist 50 to 100 percent
more tensile stresses, and continued to resist the shrink-
age stresses even after 8 to 12 months.
Applications of GFRC worldwide
Cladding
Much earlier, in the late 1970’s, GFRC panels were used
on exterior wall of prefabricated timber frame houses con-
structed to meet the shortage of dwellings in Scotland.
Road and rail sound walls
Throughout the world, new highways and mass tran-
sit rail systems compete for space in already developed
urban areas. The result is that major traffic routes are
found closer to commercial and residential areas and it
becomes necessary to suppress noise pollution to the
surroundings. GFRC noise barriers are being increasingly
used since they are light in weight and offer simplicity
and speed of erection without requiring the use of heavy
lifting machinery.
Ducts and Channels
For drainage and transporting liquids represent another
application for GFRC. A commercially available high vol-
ume, rain-water drainage channel used in parking lots,
road and highway applications. These channels are de-
signed for optimum flow capacity and are available in dif-
ferent cross-sectional sizes with lengths ranging up to 2
meters (6.6 feet). Further, these channels are lightweight,
easy to install in long sections with reduced excavation,
maintenance free, and require fewer silt traps or man-
holes due to their superior hydraulic performance. The
channels are produced by vibration casting an AR fibers
mix into a two-part mold.
EXPERIMENTAL PROGRESS
General
The experimental program was carried out to evaluate the
mechanical properties i.e, compressive strength and split
tensile strength with replacing glass fibre. The program
involves casting and testing of total specimens. The speci-
mens of standard cubes of 150mmx150mmx150mm and
cylinders of 150mmx300mm are casted with and without
glass fibre. In first batch the specimens were cast with
0% fibre content and remaining four batches were cast by
using fibre varying with 0.8%, 1.2%, 1.5% by the weight
of the cement.
Study of materials
The materials that are used for the current project are
1) Cement
2) Fine aggregate
3) Coarse aggregate
4) Glass fibre
5) Water
6) Admixture
Cement
Cement is defined as the product manufactured by burn-
ing and crushing to powder an intimate and well-propor-
tioned mixture of calcareous and argillaceous materials.
The cement, which is generally used for preparing con-
crete, is the Ordinary Portland Cement. But for special
purposes other qualities of cement such as Low Heat Ce-
ment, Rapid Hardening Cement, High Alumina Cement,
White Cement, Blast Furnace Slag Cement, Sulphate Re-
sisting Cement, etc. are also used.
The selection of a particular type of cement to be used for
manufacturing of concrete, depends upon the following
factors :
a) The required strength of the concrete structure.
b) The type of structure.
c) The conditions under which the construction of struc-
ture is to take place.

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Tests on Cement
Field tests on cements are carried to know the quality of
cement supplied at site. It gives some idea about cement
quality based on colour, touch and feel and other tests.
Testing of cement
The following are the field tests on cement:
a) The colour of the cement should be uniform. It should
be grey colour with a light greenish shade.
b) The cement should be free from any hard lumps. Such
lumps are formed by the absorption of moisture from the
atmosphere. Any bag of cement containing such lumps
should be rejected.
c) The cement should feel smooth when touched or rubbed
in between fingers. If it is felt rough, it indicates adultera-
tion with sand.
d) If hand is inserted in a bag of cement or heap of ce-
ment, it should feel cool and not warm.
e) If a small quantity of cement is thrown in a bucket of
water, the particles should float for some time before it
sink.
Ordinary Portland cement available in local market of
standard brand was used in the investigation. Care has
been taken to see that the procurement made from a sin-
gle batch and is stored in airtight containers to prevent it
is being affected by atmospheric, monsoon moisture and
humidity.
Cement brand Jaypee
Specific gravity 3.15
Fineness 3200m2
/kg
Soundness 1.9cm
Tests and results on cements
Following are the tests for sand:
1. Silt Content Test of Sand: The maximum quantity of
silt in sand shall not exceed 8%. Fine aggregate contain-
ing more than allowable percentage of silt shall be washed
so as to bring the silt content within allowable limits.
2. Grading of sand: On the basis of particle size, fine ag-
gregate is graded into four zones. Where the grading falls
outside the limits of any particular grading zone of sieves,
other than 600 micron IS sieve, by a total amount not
exceeding 5 percent, it shall be regarded as falling within
that grading zone.
Gradation of fine aggregates
Fine aggregate
The gradation of sand is given by sieve analysis. The sieve
analysis is done by passing sand through a set of stand-
ard sieves and finding out cumulative passing percentage
through each sieve. The IS 383 – 1970 -Table 4, (clause
4) classifies fine aggregates in 4 zones starting from zone
I representing coarse sand, to zone IV representing the
finest sand. The limits of cumulative percentage passing
for each sieve for above zones are given in table 4 of IS
383 The fineness of sand found by sieve analysis governs
the proportion of sand in concrete. The overall fineness of
sand is given by factor called fineness modulus. Fineness
Modulus is given by division of the summation of cumula-
tive retained fractions for standard sieves up to 150-mi-
cron sieve size by 100. The fineness modulus of sand var-
ies from 2.0 to 4.0; higher the FM coarser is the sand.
Fineness modulus of sand
Fine – 2.0 to 2.8
Medium – 2.8 to 3.2
Coarse – 3.2 and above
Coarse aggregate
Machine Crushed angular granite metal of maximum size
of 20mm retained on 4.75mm I.S. sieve confirming to I.S.
383-1970 was used in the present investigation. It is free
from impurities such as dust, clay particles and organic
matter etc. The coarse aggregate is also tested for its vari-
ous properties.
10mm coarse aggregate
20mm coarse aggregate

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International Journal of Research and Innovation (IJRI)
TESTS RESULTS
Specific Gravity 2.76
Fineness Modulous 8.34
Dry Loose Bulk Density 1.6
Tests on coarse aggregate
Water
As per IS 456-2000 recommendations, potable water was
used for mixing of concrete.
Water is the least expensive but most important ingredi-
ent of the concrete. The water, which is used for making
concrete should be clean and free from harmful impuri-
ties like oil, alkalis, acids etc. in general, the water which
is fit for drinking should be used for making concrete.
Admixture
Super Plasticizer: Conplast P211(M)
Conplast P211(M) is a chloride free water reducing admix-
ture based on selected sugar-reduced lignosulphonates.
It is supplied as a brown solution which instantly dis-
perses in water.
Uses
• To improve the effectiveness of the water content of a
concrete mix.
• Higher dosages provide effective means of reducing con-
crete permeability and thereby reducing water penetra-
tion.
Advantages
• Allows specified strength grades to be met at reduced
cement content or increased workability.
• Water reduction significantly improves compressive
strengths at all ages and enhances durability through the
production of low permeability concrete.
• Minimises the risk of segregation and bleeding and as-
sists in the production of a dense, close textured surface,
improving durability.
• Chloride free, safe for use in prestressed and reinforced
concrete.
Description
Conplast P211(M) is a chloride free water reducing admix-
ture based on selected sugar-reduced lignosulphonates.
It is supplied as a brown solution which instantly dis-
perses in water.
Conplast P211(M) disperses the fine particles in the con-
crete mix, enabling the water content of the concrete to
perform more effectively and improving the consistency
of the concrete. This produces higher levels of workability
for the same water content, allowing benefits such as wa-
ter reduction and increased strengths to be taken.
Workability test
The two tests used to measure the workability of concrete
are
1. Slump test.
2. Compaction factor.
Slump test:- In the case of slump test, firstly the internal
surface of the mould is cleaned and moistened with damp
cloth. The mould is then filled with concrete in three lay-
ers where each layer is around one third height of the
specimen and each layer is tamped 25 times with tamping
rod during filling. The surface concrete is rolled off then
the mould is removed immediately by raising it slowly in
vertical direction. Measure the height if the slump which
is the difference between the height of the mould and the
average height of the mould and the average height of the
top surface of concrete .
Slump test
Summary
In this chapter, the study of materials used, their proper-
ties, mixing procedures of the concretes, the phases of
experimental program and the procedures for testing of
fresh and hardened concretes was discussed. The results
of the experimental program discussed in this chapter is
tabulated and studied in the next chapter.
CONCRETE MIX DESIGNS
General
The process of selecting suitable ingredients of concrete
and determining their relative amounts with the objective
of producing a concrete of the required, strength, durabil-
ity, and workability as economically as possible, is termed
the concrete mix design. The proportioning of ingredient
of concrete is governed by the required performance of
concrete in 2 states, namely the plastic and the hardened
states. If the plastic concrete is not workable, it cannot be
properly placed and compacted. The property of workabil-
ity, therefore, becomes of vital importance.
Requirements of concrete mix design
The requirements which form the basis of selection and
proportioning of mix ingredients are :
a ) The minimum compressive strength required from
structural consideration
b) The adequate workability necessary for full compaction
with the compacting equipment available.
c) Maximum water-cement ratio and/or maximum ce-
ment content to give adequate durability for the particu-
lar site conditions
d) Maximum cement content to avoid shrinkage cracking
due to temperature cycle in mass concrete.

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International Journal of Research and Innovation (IJRI)
Concrete Mix Design – M 30 Grade of Concrete
Requirements
a) Specified minimum strength = 20 N/Sq mm
b)Durability requirements
i)Exposure= Moderate
ii) Minimum Cement Content = 300 Kgs/cum
c) Cement
(Refer Table No. 5 of IS:456-2000)
i) jaypee cement
ii) Type OPC
iii) Grade 53
d) Workability
i) compacting factor = 0.8
e) Degree of quality control Good
Test data for materials supplied
a) CEMENT
i) Specific gravity = 3.05
ii) Avg. comp. strength 7 days = 46.5 more than 33.0 OK
28 days = 55.0 more than 43.0 OK
b) COARSE AGGREGATE
i) 20mm Graded
Type Crushed stone aggregate
Specific gravity = 2.68
Water absorption = 1.46
Free (surface) moisture = 0
c) FINE AGGREGATE (Coarse sand)
i) Type Natural (Ghaggar)
Specific gravity = 2.6
Water absorption = 0.5
Free (surface) moisture = 1.4
Sieve analysis results
Target mean strength (TMS)
a) Statistical constant K = 1.65
b) Standard deviation S = 4.6
Thus, TMS = 27.59 N/Sqmm
Selection of w/c ratio
a) As required for TMS = 0.5
b) As required for ‘Moderate’ Exposure = 0.55
Assume W/c ratio of 0.5
Determination of water & sand content
For W/C = 0.6
C.F. = 0.8
Max. Agg. Size of 20 mm
a) Water content = 186 Kg/cum
b) Sand as percentage of total aggregate by absolute
volume = 35 %
Thus,
Net water content = 180.42 Kg/cum
Net sand percentage = 33 %
Adjustments
RESULTS AND DISCUSSIONS
General
Series of tests were carried out on the concrete specimens
to obtain the strength characteristics of concrete cubes
with different percentages of fibre glass. This chapter dis-
cusses on the results that obtained from the testing. This
results such as compressive test, slump test.
Compressive Strength
Compressive strength of the concrete is the key property
of concrete. Compressive strength of concrete is taken as
a basis for evaluating various other property of the con-
crete. Thus cube compressive strength of concrete mixes
was determined at 7 and 28 days age is carried out to
verify target strength. It is observed that with increase in
fibre percentage, the compressive strength also increases
with age.
Cube specimens were tested for compression and the ul-
timate compression strength was determined from failure
load measured using the compression testing machine.
The average values of specimens for each category at
the age of 7 and 28 days are tabulated. The compressive
strength of CEM-FIL Anti Crack HD glass fibre concrete is
found to be maximum at 1.5% of fibres.
Split Tensile test
Tensile strength is important property of concrete be-
cause concrete structures
are highly vulnerable to tensile cracking due to various
kinds of effects and applied
loading itself. However,tensile strength of concrete is very
low in compared to its
compressive strength.
COMPRESSIVE TEST RESULTS
Percentage of re-
placement
7 days 28 days
0 22.71 39.66
0.8 24.39 41
1.2 26.89 37.25
1.5 23.95 35.21

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International Journal of Research and Innovation (IJRI)
SPLIT TENSILE TEST RESULTS
Percentage of re-
placement
7 days 28 days
0 1.2 2.96
0.8 1.5 3.1
1.2 1.2 2.87
1.5 1.1 3.13
Summary
In this chapter, the results obtained from the experimen-
tal program are tabulated and are represented in the form
of graphs. The results were studied and based on this
study, the conclusion were drawn. The conclusions for
the present study are given in the next chapter.
Scope for further investigation
1. To strengthen the observations and conclusions made
in the present investigation, more number of cubes with
higher grades, and varying percentages of fibres may be
investigated.
2. Mathematical formulations may be developed to verify
the experimental observations
3. Further research can be carried out to study the me-
chanical properties of glass fibre reinforced self compact-
ing concrete.
Conclusion
This research project is to determine the strength char-
acteristics of glass fibre reinforced concrete for potential
application in the structural concrete. Based on the ex-
perimental results the following conclusions were drawn.
1. The compressive strength of CEM-FIL Anti Crack HD
glass fibre concrete is found to be maximum at 1.5% of
fibre.
2. This is an indication of higher toughness which is a
measure of ability to observe energy during deformation.
3. Higher percentages of glass fibres from 1.5% affect the
workability of concrete, and may require super plasticizer
to maintain the workability.
4. With the use of glass fibre in concrete it has shown an
improvement in mechanical properties such as compres-
sive strength for M20, M40, M60.
5. Cracks could be controlled with addition of glass fibre.
Cracks have occurred and propagated gradually till the fi-
nal failure. This phenomenon is true with all the percent-
ages of fibre. Glass fibre also helps in controlling shrink-
age cracks.
Reference
• ASTM C-1018 (1997) “Standard Specification for flex-
ural toughness and first crack strength of fibre reinforced
concrete & shotcrete” American society for testing and
materials
• “Measurement of Fibre Reinforced Concrete,” ACI Com-

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inforced concretebeams with normal and fibre reinforced
concrete under monolithic and cyclicloading” Ph.D The-
sis, IIT, Madras.
Author
Durisetti Praveen,
Research Scholar,
Department of Civil Engineering,
Aurora's Scientific Technological and Research Academy,
Hyderabad,India.
M.Rajshekar Reddy,
Assistant professor ,
Department of Civil Engineering,
Aurora's Scientific Technological and Research Academy,
Hyderabad,India.
K. Mythili
Associate professor ,
Department of Civil Engineering,
Aurora's Scientific Technological and Research Academy,
Hyderabad,India.