CONCRETE PROTECTION MATERIALS

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CONCRETE PROTECTION MATERIALS TECHNIQUES

• CE 402
• DONE BY
• AHMED AL-HAWAS
• FAYEZ AL-SAIKHAN

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OUTLINE

• INTRODUCTION.
• CONCRETE SURFACE SEALERS.
• FRP.

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• No protection means !!!

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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 to
  protect the concrete.
•   Sealers act to prevent damage from traffic,
  water and chemical agents. 
• Sealers reduce the porosity of concrete and
  prevent water and dirt from getting into the
  concrete.

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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 the concrete. 
• -They get 1 to 4 millimeters into the concrete to
  increase water repellency.
• -Unlike the film formers, they do not leave a
  sheen or gloss.

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Which 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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Sealer Application

• Surface Prep
• - clean the concrete surface before sealing.
• - coat the floor for 10 to 15 minutes .
• Apply Sealer
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• 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 alternatives to steels and alloys to combat
  the high costs of repair and maintenance of
  structures damaged by corrosion and heavy use.
• Fiber Reinforced Polymer (FRP) is a relatively
  new class of composite material manufactured from
  fibers and resins (and has proven efficient and
  economical for the development and repair of new
  and deteriorating structures in civil
  engineering.

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FRP 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 transfers the 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 have demonstrated exceptional
  durability, and effective resistance to effects
  of environmental exposure

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Advantages of FRP

• Light weight . ( FRP deck 25 psf - Concrete
  deck 119 psf )
• Resistance to de-icing salts and other chemicals.
  
• 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
  deflection driven design which does not allow a
  designer to fully capitalize on the FRP's
  strength

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• Thank you for listening
• Questions please