Rubber, Plastic & FRP
Nishatee Binte Shahid
Lecturer
Slide Courtesy: Ishfaq Aziz Sir
Assistant Professor, Department of Civil Engineering, BUET
Rubber
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Rubber is an elastic material used for various engineering purposes
Different Types of Rubber:
1. Natural
2. Synthetic
Uses of Rubber
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Bridge Bearing
Thermal insulation
Lining for reservoir
Tires and tubes
Adhesive
Hose pipes, printing rollers etc
Dept. of Civil Engg.
BUET
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Plastic
Any non-metallic material that can be molded to the desired shape.
They are natural or synthetic resins, or their compounds, which can be
molded, cast, or used as films or coatings. Basic raw materials used in
manufacturing plastic are obtained from coal, petroleum, limestone, salt,
sulfur, air, water, cellulose, etc. In the field of building construction, they are
useful for fittings, fixtures, structural component parts, etc.
Uses of Plastic
• floor tiles
• electric insulator
• bath and sink units
• overhead water tanks
• lighting fixtures
• roof lights
• corrugated and plain sheets
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Commercial Forms
• PVC
• Polythene sheets
• Corrugated plastic sheets
Dept. of Civil Engg.
BUET
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Pyramidal Roof Light
Corrugated Roof Sheets
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Dept. of Civil Engg.
BUET
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Fiber reinforced polymer (FRP) composites
Over the past few decades, advanced composites have increasingly
become smart materials for new structures and the renewal of existing
civil engineering infrastructures.
Fibre reinforced polymer (FRP) composites are now widely used in civil
engineering applications. The repair and maintenance of deteriorated,
damaged, and substandard civil infrastructures has become one of the
most important issues for the civil engineer worldwide
Fibre-reinforced polymer (FRP) composites are composed of fibres and
matrices, which are bonded.
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Dept. of Civil Engg.
BUET
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Fiber reinforced polymer (FRP) composites
Fiber-reinforced polymer (FRP), also Fiber-reinforced plastic, is a composite
material made of a polymer matrix reinforced with fibers.
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The polymer is usually an epoxy, vinylester or polyester thermosetting
plastic, and phenol formaldehyde resins are still in use
The fibers are usually glass (mostly used), carbon (cost effective), or aramid
(extremely sensitive to environmental conditions)
Although other fibers such as paper or wood or asbestos have been
sometimes used
Dept. of Civil Engg.
BUET
Uses of FRP
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• Aerospace
• Automotive industries
• Marine industry
• Construction industry
• The use is increasing due to
new forms of FRP, e.g. new
styles of reinforcement,
such as carbon nanotubes
and nanoparticles
The fibers are used in many forms
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Dept. of Civil Engg.
BUET
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Use of FRP in Civil Engineering Applications
• FRPs’ are being used as substitutes
of concrete and steel due to the
following advantages
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lightweight
non-corrosive nature
High strength and stiffness
Can be tailored to satisfy
performance requirements
• These are being used through its
use as reinforcement in concrete,
bridge decks, modular structures,
formwork,
and
external
reinforcement for strengthening
and seismic upgrade
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https://strongtie.com.au/products/frp-carbon-fibre-reinforcing-systems
Dept. of Civil Engg.
BUET
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Disadvantages of using FRP as reinforcements
• Generally, FRPs have a linear elastic response in tension up to failure
(brittle failure)
• Relatively poor transverse or shear resistance.
• Poor resistance to fire and when exposed to high temperatures
• Loose significant strength upon bending
• Their cost, whether considered per unit weight or based on force
carrying capacity, is high in comparison to conventional steel
reinforcing bars or prestressing tendons
Reference of today’s lecture
❑ Lecture note of Dr. Shariful Islam Sir, Professor, Dept. of CE.
❑ Introduction of Fibre-Reinforced Polymers − Polymers and Composites: Concepts, Properties and Processes by
Martin Alberto Masuelli
❑ Fiber Reinforced Polymer Composites for Infrastructure Strengthening-From Research to Practice by A. Nanni
❑ Design Training Expr-2014: McDaniel, Roadway Design Standards Administrator & Chase Knight, Composite
Materials Research Specialist
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Dept. of Civil Engg.
BUET
Thank You!!!