concrete protection materials & techniques.ppt

7/30/2019 CONCRETE PROTECTION MATERIALS & TECHNIQUES.ppt

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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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concrete protection materials & techniques.ppt

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