engineering recuitment JSSC JE Mock Test 2023 Construction Materials and Management Cement

When rapid hardening cement is tested for fineness in terms of specific surface by Blaine's air permeability test as per IS: 4031-1988, the specific surface must NOT be less than:

1
400 m2/kg
2
375 m2/kg
3
325 m2/kg
4
225 m2/kg
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