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Cinders/Expanded pumice concrete

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These concretes seem to be a no brainer but they are used seldomly. Pumping can drive water into the aggregate decreasing pumpability, even drastically, but good sense uses a presoaking before mixing. Brittleness may be mitigated with cement paste. If used without sand, say a block mix of quarter inch minus, it can wick in water, largely due to the pathway exiting water leaves through curing. Aggregate at 57pcf with a six sack mix, may make about a 3500 psi concrete at about 80 pcf. I've heard of worries about embedded steel from corrosion, but also, as a principle of Gabions and the old Omni Coliseum in Atlanta,, that rust evolves to a protective coating. 
Curious as to insights and experiences with sand free lightweight concrete, and does a little bit of sand make all the difference for finishability?

-- 
Walter DeVore
Owner/Engineer
Cavity Wall Technology
480 Overlooked Way
Idaho Springs, CO 80452
303 567 2415
wdevore(--nospam--at)cavity-wall.com
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