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RE: Reinforced Concrete Blockwork Constr

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Yes this is true.  The cell closure plates that are manufactured for
this purpose are powder coated to prevent this.  They also make tin
alloy plates which work equally as well.


-----Original Message-----
From: Roger Turk [mailto:73527.1356(--nospam--at)compuserve.com]
Sent: Tuesday, July 27, 1999 12:19 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Reinforced Concrete Blockwork Constr


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