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Lightweight Concrete

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Title: Lightweight Concrete

anyone have experience with lightweight concrete deflecting more than calculations indicate?

conventionally reinforced.
got the reduced E due to lightweight.
got the reduced fr in the cracking moment calc.
still get more measured deflection at 150 days than calculated delta dead plus 1/2 of total creep.

any common experiences with such in lightweight (spec'd as <115pcf, 4000psi)

actual 28 day breaks exceed 4500psi.

thoughts

tia

robert d. rollo, PE
Corporate Associate
Parkhill, Smith & Cooper, Inc.
Lubbock, Texas
rrollo(--nospam--at)team-psc.com
rdrollo(--nospam--at)aol.com
(806) 761-7539vox
(806) 747-7146 fax