Durability of concrete: ability to resist weathering action, chemical ...

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Frost Action on Aggregate •Aggregates likelihood to cause freezing damage depends on pore: •Sizes •Number •Continuity •3 classes of aggregate •(1) Low permeability and high strength: No problem! The rock is strong enough to support the hydraulic pressure. •(2) Intermediate permeability: Potential depending on (a) rate of temperature drop. (b) distance the water must travel to find an escape boundary – Critical Aggregate Size (a large aggregate may cause damage but smaller particles won't). •(3) High permeability: May cause problem with the transition zone. CE 60 Instructor: Paulo Monteiro
Factors Controlling Frost Resistance of Concrete MSA (in) air content (%) 3/8 1/2 3/4 1 2 3 7.5 7 6 6 5 4.5 CE 60 Instructor: Paulo Monteiro
Page 1 and 2: Durability Durability of concrete:
Page 3 and 4: Water in the Capillary CE 60 Instru
Page 5 and 6: Permeability of Cement Paste •Age
Page 7 and 8: Permeability of Aggregate • Compa
Page 9 and 10: Permeability of Aggregates Type of
Page 11 and 12: Physical Causes of Concrete Deterio
Page 13 and 14: 3. Deterioration by Frost Action Pr
Page 15 and 16: 3. Deterioration by Frost Action Ai
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Page 21 and 22: Consequence CE 60 Instructor: Paulo
Page 23 and 24: Effect of High Temperature •Effec
Page 25 and 26: Electrochemical Process of Steel Co
Page 27 and 28: Carbonation of Concrete Painting wi
Page 29 and 30: ASR Chemistry 1) The high pH in the
Page 31 and 32: ASR Optical Image CE 60 Instructor:
Page 33 and 34: ASR Damage Examples Built in 1965,
Page 35 and 36: Sulfate Attack Importance • Sulfa
Page 37 and 38: Expansion of Concrete • When conc
Page 39 and 40: Expansive Reaction • C 3 A + 3C$H
Page 41 and 42: Sodium Sulfate Attack • Na 2 SO 4
Page 43 and 44: Factors Influencing Sulfate Attack
Page 45: ACI Building Code 318 • Severe at

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