Delamination

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Delamination

• Abdullah AL-Mohaimmeed
• 939015

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Definition

• The act of splitting or separating a laminate
  into layers.

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Causes of Delamination

• Delamination is a mode of failure of laminated
  composite materials.
• Repeated cyclic stresses impact, and so on can
  cause layers to separate, forming a mica-like
  structure of separate layers, with significant
  loss of mechanical toughness.

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Causes of Delamination

• Delamination is an insidious kind of failure as
  it develops inside of the material, without being
  obvious on the surface, much like metal fatigue.
• In a delaminated surface, the top is separated
  from the base slab by a thin layer of air or
  water
• They may exhibit cracking and color differences
  because of rapid drying of the thin surface
  during curing

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Reasons of Delamination

• Delamination is more likely to form if
• 1. The underlying concrete sets slowly because of
  a cool subgrade.
• 2. Set is retarded by retarders and/or fly ash.
• 3. Entrained air is used (or is higher than
  normal).
• 4. Use of a jitterbug or vibrating screed brings
  too much mortar to the surface.

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Reasons of Delamination

• Delamination is more likely to form if
• 5. A dry shake is used, particularly with air
  entrained concrete.
• 6. The concrete is sticky from higher
  cementations material or sand content.
• 7. The slab is thick.
• 8. The slab is placed directly on a vapor barrier.

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Reasons of Delamination

• Air contents Entrained air is used in
  lightweight concrete to help produce the required
  maximum density and fire resistance.
• Supplementary cementitious materials Lightweight
  concrete mixes designed for strength and economy
  contain more supplementary cementitious material
  such as fly ash and slag than they did in the
  past.
• Retarding effects of admixtures Many water
  reducers increase concrete setting time. These
  effects are even more pronounced when water
  reducers are used with supplementary cementitious
  materials.

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Methods Solving the Problems of Delamination

• Pan floats used on non-air-entrained concrete did
  not cause delaminations.
• Pan floats used on non-air-entrained
  concretewithout first using walk-behind trowels
  to ensure that the concrete was ready for pan
  floatingdid not cause delaminations.

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Methods Solving the Problems of Delamination

• Pan floats used on non-air-entrained concrete
  with a dry shake applied at a rate of 1 pound per
  square foot did not cause delaminations.
• Pan floats used on non-air-entrained concrete
  while there was still some sheen on the surface
  did not cause delaminations.

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Methods Solving the Problems of Delamination

• Decopoxy is water borne low VOC penetrating epoxy
  coating that has been specifically formulated to
  protect interior commercial or residential
  cementations floors
• Advantages of Decopoxy
• Enhances depth of color on decorative surfaces
  and acid stained jobs.
• Provides full wet look, high gloss and high wear
  resistance. Ideal for commercial applications.
• When used in conjunction with Final Coat, it
  provides a long lasting easy to maintain floor.
• Excellent mechanical bond to concrete (locks into
  concrete).

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Methods Solving the Problems of Delamination

• Advantages of Decopoxy
• Improves vapor pressure resistance. (Seals
  concrete)
• If top coated, it increases topcoat coverage,
  adhesion and performance
• Small particle size allows deep penetration into
  concrete via capillary action.
• May be used as primer for both water and solvent
  base sealers.
• Helps prevent delamination.
• Non-Flammable, Low-Odor and Toxicity.
• Superior Chemical Resistance.
• Easy to Recoat

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