Answers . 27 July 2005                     
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    NEXT WEEK

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    Quizzical Pursuit
    —The Architecture Puzzler

    Created by Dave Guadagni

    Solution to Last Week's Puzzler
    Architecture Puzzler #248

    Question

    How does concrete react to aluminum? Also, why should you not allow the use of aluminum wire for tying rebar?

    Answer

    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.
     


     

    Okay, got it? Now try this week's Puzzler:

    http://www.ArchitectureWeek.com/quiz.html


     

    Dave Guadagni, AIA, is an architect with Robertson/Sherwood/Architects

    Quizzical Pursuit is Copyright 2005, Dave Guadagni.

    AW

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