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RE: Partial cement replacement

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I haven't had any experience with slag, but it's probably similar to using
type F fly ash.  For the latter, we commonly specify 15% to 25% of the sum
of cement + ash to get better sulfate resistance and lower heat of hydration
than with straight cement.  However, the early strength is reduced.
Shouldn't matter what grade of rebar you're specifying.

	-----Original Message-----
	From:	Kho Poh Teck [SMTP:ptkho(--nospam--at)]
	Sent:	Tuesday, October 13, 1998 3:02 AM
	To:	seaint(--nospam--at)
	Subject:	Partial cement replacement

	Is anyone familar with concrete mixes with GGBFS (Slag)? What would
be the
	best proportion of cement to slag with a max w/c ratio of 0.4 and a
	of 125mm? Can anyone be kind enough to let me know for Grade 50 or
	40. The concrete is intended for massive pilecaps.