Answers . 29 July 2009                     
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    Quizzical Pursuit
    —The Architecture Puzzler

    Created by Dave Guadagni

    Solution to Last Week's Puzzler
    Architecture Puzzler #436

    Question

    There are several admixtures that can be added to your concrete mix design to minimize the possibility of water penetration through concrete walls. These typically are either a crystalline waterproofing admixture or a pore-blocker admixture. Which one of these is hydrophilic and how does it work?

    Answer

    The crystalline waterproofing admixture is hydrophilic. When in contact with moisture, the crystals in the admixture are attracted to the moisture and begin to grow and fill the small capillary spaces within the concrete, thus blocking the passage of water. This growth occurs during initial hydration of the concrete and will occur again any time later that moisture penetrates the wall.
     


     

    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 2009, Dave Guadagni.

    AW

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