The Architecture Puzzler
Created by Dave Guadagni
Solution to Last Week's Puzzler
Architecture Puzzler #248
How does concrete react to aluminum? Also, why should you not allow the use of aluminum wire for tying rebar?
Aluminum will react with the alkalis in concrete and produce hydrogen bubbles when curing. This causes the concrete to expand. Some admixtures include aluminum on purpose to produce expansive concrete. Aluminum cast into concrete will corrode. The corrosion will result in expansion and cracking. Over time aluminum tie wires will corrode and can cause enough localized stress to cause spalling immediately over the tie locations.
Dave Guadagni, AIA, is an architect with Robertson/Sherwood/Architects
Quizzical Pursuit is Copyright 2005, Dave Guadagni.
Pouring concrete for the Panama Canal.