Answers . 13 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 #246

    Question

    Clay soils are sticky (cohesive) and can be excavated to a much steeper angle than sandy soils. This cohesion is partially due to the size and shape of its particles. Clay particles are small and flat shaped. Sand particles are larger and rounder. If a clay particle were the size and shape of a sunflower seed, would a medium-size sand particle be, proportionally, about the size of a golf ball? A basketball? Ten feet (3 meters) in diameter? Or 100 feet (30 meters) in diameter?

    Answer

    Relative to a sunflower seed-sized clay particle, the sand particle would be 100 feet (30 meters) in diameter. Part of the cohesion of clay soils is due to particle-to-particle attractions that are the result of electrical charges on the faces of microscopic minerals. This does not occur between sand particles.
     


     

    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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