Initial setting times of three (3) concrete mixes, which have identical proporti

Question

Initial setting times of three (3) concrete mixes, which have identical proportions of coarse aggregate, fine aggregate, cement and water, are measured. The only difference among these three (3) concrete mixes is the type of cement used. The original concrete mix that contained 100% Portland cement (Mix A) was modified to include 25% fly ash and 75% Portland cement (Mix B) and 10% silica fume and 90% Portland cement (Mix C). What would be the expected initial setting times of these three (3) concrete mixes? a. Setting time of Mix A > setting time of Mix B > setting time of Mix C b. Setting time of Mix A = setting time of Mix B = setting time of Mix C c. Setting time of Mix C > setting time of Mix B > setting time of Mix A d. Setting time of Mix B > setting time of Mix A > setting time of Mix C

Explanation / Answer

Option B is correct

MIxing higher silica fume content will leads to decreased initial setting time of concrete but at lower contents of silica fume setting time of cement paste doesn't effect much.

so for given all three mixes setting time will be same.

Initial setting time of port land cement mix is 30min

high alumina cement have highest intial setting time of 3.5hrs

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