comparision of conventional concrete and special cement concrete

39 Pages·2015·2.6 MB·English

COMPARISION OF CONVENTIONAL
CONCRETE AND SPECIAL CEMENT
CONCRETE

Submitted In Partial Fulfillment Of The Project Requirements
Of The Under Graduate Degree
Civil Engineering

By

SYED SHAHABUDDIN AHMED (11CE58)

Under The Guidance Of
Prof. Shafi Mujawar

DEPARTMENT OF CIVIL ENGINEERING
ANJUMAN-I-ISLAM’S KALSEKAR TECHNICAL CAMPUS
MUMBAI UNIVERSITY
2014-2015
COMPARISION OF CONVENTIONAL
CONCRETE AND SPECIAL CEMENT
CONCRETE

Submitted In Partial Fulfillment Of The Project Requirements
Of The Under Graduate Degree
Civil Engineering

By

SYED SHAHABUDDIN AHMED (11CE58)

Under The Guidance Of
Prof. Shafi Mujawar

DEPARTMENT OF CIVIL ENGINEERING
ANJUMAN-I-ISLAM’S KALSEKAR TECHNICAL CAMPUS
MUMBAI UNIVERSITY
2014-2015
CERTIFICATE

Department of Civil Engineering,
School of Engineering and Technology
Anjuman-I-Islam’s Kalsekar Technical Campus
Plot No. 2 3, Sector – 16, Near Thana Naka, Khanda Gaon,
New Panvel, Navi Mumbai. 41026

This is to certify that the project entitled “COMPARISION BEHAVIOUR OF
CONVENTIONAL CONCRETE WITH SPECIAL CEMENT CONCRETE” is a bonafide
work of, SYED SHAHABUDDIN AHMED (11CE58) submitted to the University of Mumbai
in partial fulfilment of the requirement for the award of the degree of “Bachelor of Engineering”
in Department of Civil Engineering.
Prof. Shafi Mujawar Prof. Shafi Mujawar
Guide Co-Guide

Dr. Rajendra B. Magar Dr. Abdul Razzak Honnutagi

Head of Department Director
Project Report Approval for B. E.
This project report entitled “Comparision Behaviour Of Conventional Concrete With Special
Cement Concrete” by, Syed Shahabuddin Ahmed is approved for the degree of “Bachelor of
Engineering” in “Department of Civil Engineering”.

Examiners
1 ______________________
2 ______________________
Supervisors
1 ______________________
2 ______________________
Chairman (Director)
_______________________
Date:
Declaration

I declare that this written submission represents my ideas in my own words and where others
ideas or words have been included, I have adequately cited and referenced the original sources. I
also declare that I have adhered to all principles of academic honesty and integrity and have not
misrepresented or fabricated or falsified any idea/data/fact/source in my submission. I understand
that any violation of the above will be cause for disciplinary action by the Institute and can also
evoke penal action from the sources which have thus not been properly cited or from whom
proper permission has not been taken when needed.

Syed Shahabuddin Ahmed (11CE58)
Acknowledgements

This research was supported/partially supported by Anjuman-I-Islam . We thank our colleagues
from Anjuman-I-Islam Kalsekar Technical Campus who provided insight and expertise that
greatly assisted the research, although they may not agree with all of the
interpretations/conclusions of this paper.
We thank Prof Shafi Mujawar for assistance with Concrete Technology and Dr R.J Magar,
HOD, Civil Department ,Kalsekar Technical Campus for comments that greatly improved the
manuscript.
We would also like to show our gratitude to the Shivaji Rao, Prof Civil Department , Kalsekar
Technical Campus for sharing their pearls of wisdom with us during the course of this research,
and we thank 3 “anonymous” reviewers for their so-called insights. We are also immensely
grateful to (List names and positions) for their comments on an earlier version of the manuscript,
although any errors are our own and should not tarnish the reputations of these esteemed persons.

SYED SHAHABUDDIN AHMED
Chapter 1
Introduction
Concrete is widely used construction material in the world. nowdays the world
witnessing the construction of more and more challenging and difficult engineering structures.
so the concrete need to posses very high strength and sufficient workability. Researches all
the world developing high performance concrete by adding various fibres, admixtures in
different proportion . various fibres like glass ,carbon, polypropylene and provide
improvement in concrete properties like tensile strength fatigue characteristic, durability,
shrinkage, impact erosion resistence and serviceability of concrete
Special concrete is defined as concrete which meets special performance and uniformity
requirements that cannot always be achieved routinely by using only conventional materials
and normal mixing, placing and curing practices. The requirements may involve
enhancements of characteristics such as placement and compaction without segregation, long-
term mechanical properties, jearly-age strength, toughness, volume stability, or service life in
severe environments.
Special cement concrete is a concrete that serve some specific function such as
altering the setting or hardening behaviour of a concrete, producing different colours for
architectural effects, imparting superior workability, imparting water retention and plasticity
to mortars, resisting the penetration of water in walls or containment vessels or simply
reducing the cost of the cementing agent.
In conventional concrete construction, a minimum quantity of free water is needed
for a specified workability that reaches the strength and durability of the concrete. However,
in RCC works, the free water content is determined by the field condition. The conditions on
the field usually depend on parameters such as the ease of compaction, the process, and the
ability of the concrete paste to support the vibrating roller without collapsing or bearing any
imprint.
RCC for pavements is placed without form, finishing, or surface texturing. Large quantities of
Special Cement Concrete can be placed with minimum cost, compared with conventional
concrete. SCC for pavements is stronger and therefore is more durable than asphalt
pavements. As for mixing, placing, and curing both types of concrete in either hot or cold
climates, shares the same types of concerns.
Therefore, the techniques for handling them under extreme weather (hot or cold) are almost
the same. However, for RCC, because of the less number of construction joints and therefore
large surface area, the care needed and precision
procedures involved may be greater. The advantages of SCC techniques over
conventional concrete include the lower cost, increased durability with minimum
maintenance, and speed of construction.
Conventional Concrete is prepared from a mixture of coarse and fine aggregates,
Portland cement (PC), and water. Other additives such as fly ash and different types of
admixtures such as air-entraining agents, accelerators, retarders, and plasticizers also may be
used to improve the concrete’s capabilities for workability and/or strength. Before concrete
is produced, the components that make up concrete are tested for their qualitative
performances. The aggregates for concrete are usually tested for gradation, hardness, specific
gravity, absorption, and organic material impurities. PC usually is tested for consistency,
initial and final set, soundness, and strength (with mortar). Water is tested at the source of
supply for its purity and portability. Admixtures usually are considered acceptable on
certification from the supplier . After mixing the components, fresh concrete is produced and
transported to the field to be poured into its final place for hardening
1.1 Fibre :
Polypropylene is a synthetic hydrocarbon polymer material, first introduced in
19572,21. It is one of a group of synthetic, polymeric fibers (including but not limited to
nylon, polyester, and polyethylene) adapted from the textile industry which have been added
to PCC in an attempt to improve performance. Currently polypropylene is the most widely
used of the synthetic fibers for paving applications .
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The addition of various types of fibers to mechanically improve or modify the performance of
portland cement concrete (PCC) results in what is called fiber reinforced concrete (FRC). The
discrete reinforcing fibers are randomly dispersed within the PCC matrix. The performance
improvements attributed to fiber reinforced concrete have been increased flexural, tensile, and
dynamic strength, ductility, and toughnessl. 2 . The types of fibers commonly used include:
steel, glass, polymeric, carbon, asbestos, and natural fibers. The polymeric type include:
polypropylene, polyethylene, polyester, acrylic, and aramid fibers. Historically, the use of
fibers as reinforcement in building materials dates back thousands of years and includes the
use of asbestos fibers to construct clay pots, straw in making bricks, and hair in construction
mortars 2 , 3 , 4 . The use of fibers as reinforcement in concrete precedes the use of
conventionally reinforced concrete 2 . The- modern use of fibers for reinforcing concrete
dates from the 1950's to the present
Recron 3s Fibres are engineered Micro Fibers with a unique “Trianguar” Cross-section, used
in Secondary Reinforcement of Concrete. It complements Structural Steel in enhancing
Concrete’s resistance to Shrinkage Cracking and improves mechanical properties such as
Flexural / Split Tensile and Transverse Strengths of Concrete along with the desired
improvement in Abrasion and Impact Strengths.
Recron 3s Fibres are manufactured by RIL in an ISO 9001:2000 facility for use Concrete as a
“Secondary Reinforcement” at a rate of dosage varying from 0.1% to 0.4% by volume (0.9
KGs/Cu.M – 3.60Kgs/Cu.M). Fibers comply with ASTMC 1116, Type111 Fiber Reinforced
Concrete
1.2 Role of Fibers :
Cracks play an important role as they change concrete structures into permeable elements and
consequently with a high risk of corrosion. Cracks not only reduce the quality of concrete and
make it aesthetically unacceptable but also make structures out of service. If these cracks do
not exceed a certain width, they are neither harmful to a structure nor to its serviceability.
Therefore, it is important to reduce the crack width and this can be achieved by adding
polypropylene fibers to concrete

Thus addition of fibers in cement concrete matrix bridges these cracks and restrains them
from further opening. In order to achieve more deflection in the beam, additional forces and
energies are required to pull out or fracture the fibres. This process, apart from preserving the
integrity of concrete, improves the load-carrying capacity of structural member beyond
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cracking . Reinforcing steel bars in concrete have the same beneficial effect because they act
as long continuous fibres. Short discontinuous fibres have the advantage, however, of being
uniformly mixed and dispersed throughout the concrete.

Fig 1.1
1.3 Superplasticizer :

The superplasticizers are broadly classified into four groups: sulfonated
melamineformaldehyde condensate (SMF); sulfonated naphthalene-formaldehyde condensate
(SNF); modified lignosulfonates (MLS), and others including sulfonic acid esters, such as
polyacrylates, polystyrene sulfonates,etc. Blends of different superplasticizers have also been
investigated. For example, lending of lignosulfonate with superplasticizers has economical
and technological advantages. A blend of SNF and SMF-based superplasticizer may be used
to realize certain benefits
1.4 Types of Admixtures :
Concrete admixtures are used to improve the behavior of concrete under a variety of
conditions and are of two main types: Chemical and Mineral.

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