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According to IRC:15-2002 _______% Fly ash is required to be replaced with the total cementitious materials.

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According to IRC:15-2002 _______% Fly ash is required to be replaced with the total cementitious materials.

(a) 15

(b) 20

(c) 25

(d) 30

I had been asked this question during an internship interview.

Asked question is from Road Method of Mix Design in division Concrete Mix Design of Concrete Technology

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Correct answer is (c) 25

For explanation: According to IRC:15-2002, 25% Fly ash is required to be replaced with the total cementitious materials and 20% was according to 2011.

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