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According to IRC:15-2011 _______% Fly ash is required to be replaced with the total cementitious materials.

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According to IRC:15-2011 _______% 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 in an international level competition.

My question comes from Road Method of Mix Design in section Concrete Mix Design of Concrete Technology

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The correct answer is (b) 20

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

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