Download - Sulfate Resistant Concrete
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SULFATE RESISTANT CONCRETE
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MECHANISMS OF SULFATE ATTACK
Ettringite FormationReaction of Sodium sulfate with calcium
aluminate hydrateReaction of Magnesium sulfate with
calcium aluminate hydrate
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Gypsum FormationReaction of sodium sulfate with calcium
hydroxide In aqueous conditions: Reactions of
calcium sulfate with calcium aluminate hydrate
Magnesium sulfate attacks calcium silicate hydrate
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MANIFESTATION OF SULFATE ATTACK
• Loss in strength• Expansion • Surface spalling• Mass loss• Disintegration
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AFFECTED AREAS
Structures in marine environment
Areas where soil and ground water have high sulfate contents
Chemical and Mining Industries
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MAJOR PARAMETERS
1. Use of Type II or V cement.2. Reduce water/cement ratio.3. Minimize binder content.4. Replace cement with
supplementary cementitious material.
5. Provide air entrainment.6. Adequate compaction and
curing.
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SUPPLEMENTARY CEMENTITIOUS MATERIAL
• Fly ash• Silica Fumes• Blast furnace slag
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Fly Ash
Chemically binds free lime in cementitious compounds
Reduces concrete permeabilityReduces the amount of reactive
aluminates (tricalcium aluminate)
ACI 232.2R-96 (Use of Fly Ash in Concrete) reports that fly ash with CaO content less than 15% will generally improve sulfate resistance.
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DEGREE OF RESISTANCE
• Type V Cement + Fly Ash• Type II Cement + Fly Ash• Type V Cement• Type II Cement• Type I Cement + Fly Ash• Type I Cement
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SILICA FUMES
Decreases concrete permeabilitySilica fume chemically binds
some of the free calcium hydroxide in the paste preventing future reaction with sulfates.
ACI 234 states that silica fume concrete has good resistance to sodium sulfate attack but does not work as well against magnesium sulfate.
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SRC vs TRADITIONAL CONCRETE
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AUSTRALIAN STANDARDS
AS 3735 Supplementsulfate levels exceed 2000 ppm in
groundwater :
min. cement content: 320 kg/m3
max. water–cement ratio: 0.5
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AS 3972
FULLY BURIED
cement content: 335 kg/m3
water–cement ratio: 0.5
PARTIALLY BURIED
cement content: 415 kg/m3
water–cement ratio: 0.4
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Australian Standard 3972
• BENEFITS:– Minimize the corrosion of
reinforced steel– Provides high level of concrete
performance– Increased workability and
pumpability– Improved later-age concrete
strength