1. Delamination Abdullah AL-Mohaimmeed 939015

2. Definition The act of splitting or separating a laminate into layers. The act of splitting or separating a laminate into layers.

4. Causes of Delamination Delamination is a mode of failure of laminated composite materials. 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. 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.

5. 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. 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 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 They may exhibit cracking and color differences because of rapid drying of the thin surface during curing

6. Reasons of Delamination Delamination is more likely to form if: 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.

7. Reasons of Delamination Delamination is more likely to form if: 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.

8. Reasons of Delamination Air contents: Entrained air is used in lightweight concrete to help produce the required maximum density and fire resistance. 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. 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. 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.

9. 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 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. 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.

10. 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 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. Pan floats used on non-air-entrained concrete while there was still some sheen on the surface did not cause delaminations.

12. 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 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: Advantages of Decopoxy: Enhances depth of color on decorative surfaces and acid stained jobs. 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. 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. When used in conjunction with Final Coat, it provides a long lasting easy to maintain floor. Excellent mechanical bond to concrete (locks into concrete). Excellent mechanical bond to concrete (locks into concrete).

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

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