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RE: Reinforced Concrete Blockwork Constr[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: Reinforced Concrete Blockwork Constr
- From: "Jeffery Seegert (x 485)" <jbseegert(--nospam--at)matrixti.com>
- Date: Tue, 27 Jul 1999 14:40:25 -0400
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
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