concrete protection materials & techniques.ppt
TRANSCRIPT
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CONCRETE PROTECTION MATERIALS &
TECHNIQUES
By
V.Elavarasan,
Pre final year.
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OUTLINE
INTRODUCTION.
CONCRETE SURFACE SEALERS.
FRP.
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No protectionmeans !!!
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This is Why protection is needed
More durable.
Less cost .
( maintenance and repair)
To know how costly is the repair:
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This reflects the
importance of protection
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protection techniques
The key is: permeability. (How)?
It should be minimized by:
1-low w/c ratio.
2- adequate cement content.
3-control of aggregate size and grading.4-use of mineral admixtures.
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Providing adequate concrete cover .
Limiting the crack width on concrete surface .
Providing waterproof membranes on concrete
surface .
Applying protective coatings on steel surface .
Installing cathodic protection system .
Concrete surface sealers.
FRP. ( fiber reinforced polymer)
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Materials used for protection
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Equipment used in protection
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Two protection materials were
selected:
Concrete surface sealers.
FRP. ( Fiber Reinforced Polymer)
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Concrete surface sealers: Concrete sealers are
finish coatings used toprotect the concrete.
Sealers act to preventdamage from traffic,water and chemicalagents.
Sealers reduce theporosity of concrete andprevent water and dirtfrom getting into theconcrete.
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Types of Sealers: Film Formers:
creat a barrier on the concretes surface.
used for : enhancing exposed aggregate
colored concrete since they are shiny.
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Penetrates:
-These sealers penetrate into theconcrete.
-They get 1 to 4 millimeters into
the concrete to increase waterrepellency.
-Unlike the film formers, they do
not leave a sheen or gloss.
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?hich Type of Sealer to Use Depends on:
-What do you want the surface to look like ?
-What type of maintenance are you willing to
do?
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film formers glossy finish
penetrate matte finish OR slip-free surface
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:Examples on sealers
Acrylic
silicone silane
siloxane
Resin wax forms
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ealer Application: Surface Prep:
- clean the concrete surface before sealing.
- coat the floor for 10 to 15 minutes .
Apply Sealer:
Clean Up:- Wash up with warm soap and water immediately.
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Fiber Reinforced Polymer (FRP): For years, civil engineers have
been in search for alternativesto steels and alloys to combatthe high costs of repair andmaintenance of structures
damaged by corrosion andheavy use.
Fiber Reinforced Polymer(FRP) is a relatively new classof composite material
manufactured from fibers andresins (and has provenefficient and economical for thedevelopment and repair of newand deteriorating structures incivil engineering.
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RP Structure composed of : carbon or
glass, provide the
strength and stiffness.
The matrix commonly
made of polyester, Epoxy
or Nylon, binds and
protects the fibers from
damage, and transfersthe stresses between
fibers.
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Manufacturing OF FRP :
They are pre-engineered and pre-fabricated in a shop,
then assembled and installed at a bridge site where a
wearing surface is added.
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Applications of FRP as in bridges and
columns built
completely out of FRP
composites havedemonstrated
exceptional durability,
and effective
resistance to effectsof environmental
exposure
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Advantages of FRP: Light weight .
Resistance to de-icing salts and otherchemicals.
Ease and Fast installation . Reduced traffic delay .
Good durability .
Long service life . Cost savings
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Disadvantages of FRP: Higher initial cost compared to a conventional concrete
deck.
Lack of design standards and conventions for
material characterization
Limited FRP experience within the construction industry.
FRP's low modulus of elasticity leads to a deflectiondriven design which does not allow a designer to fullycapitalize on the FRP's strength
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