Fly ash (PFA) as a supplementary cementitious material in concrete primarily improves:
Choose the correct answer
Only the colour of concrete
Long-term strength, durability, reduced heat of hydration, and improved workability
Only early strength (3-day strength)
Compressive strength at 1 day only
Correct Answer
B. Long-term strength, durability, reduced heat of hydration, and improved workability
AI Detailed Explanation & IS Code Reference
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Fly ash (IS 3812): Class F fly ash (low calcium) reacts pozzolanically with Ca(OH)2 from cement hydration to form additional C-S-H gel. Benefits: reduced heat of hydration, improved workability (spherical particles), long-term strength gain, reduced permeability, better durability (sulfate/alkali resistance). Reduces cement content and cost.
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