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RE: Reinforced Concrete Blockwork Constr

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Jeffery Seegert wrote:

. > The best option is to install the very thin (36 gage) 6 x 6 aluminum cell
. > closures. 

Aluminum and concrete, mortar and grout are a NO, NO!

Aluminum and concrete can cause the concrete to expand thru the creation of 
hydrogen gas, and substantially weaken the mix.  In the 1950's, powdered 
aluminum was used to produce expansive grout and unsatisfactory results were 
achieved.  This is the reason that "non-metallic" expansive grouts are now 
routinely specified.

Section 2104.7 of the UBC prohibits handling or pumping grout utilizing 
aluminum equipment, and should be interpreted as prohibiting mortar or grout 
from coming in contact with aluminum.  If accelerators containing calcium 
chloride are used, the results can be disastrous.

A. Roger Turk, P.E.(Structural)
Tucson, Arizona