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IS code for Specification for Portland slag cement?

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IS code for Specification for Portland slag cement?

(a) IS 269:1989

(b) IS 383:197

(c) IS 455:1989

(d) IS 456:2000

This question was posed to me in an interview for job.

My doubt is from Mix Design for Pumpable Concrete topic in section Concrete Mix Design of Concrete Technology

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Correct answer is (c) IS 455:1989

To explain: IS 455:1989 is for specification for Portland slag cement to the need of civil engineering.

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