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HYDROMETER  ANALYSIS - 14071_284

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Figure  13-13.—Apparatus  for  grain  size  distribution  by  hydrometer  analysis. HYDROMETER  ANALYSIS You learned in the EA3 TRAMAN that a soil is considered  susceptible  to  frost  when  it  contains  3 percent or more by weight of particles smaller than 0.020 mm in diameter. To determine whether or not a soil contains an excessive amount of that size particle, you  must  perform  a  particle-size  analysis  of  the materials  passing  the  No.  200  (0.074-mm)  sieve.  You  do this by hydrometer analysis. This TRAMAN discussion identifies the items used for a hydrometer analysis and will briefly summarize the procedures used. For a full discussion  of  the  procedures,  you  should  refer  to NAVFAC MO-330 or to ASTM D 422. You also should review the topic of hydrometer analysis on page 15-24 of  the  EA3  TRAMAN  before  continuing  with  the following   discussion. Apparatus Figure 13-13 shows some of the items that you will need  to  perform  a  hydrometer  analysis.  Another  item you will need is an ASTM hydrometer (fig. 13-14). ASTM  hydrometers  are  graduated  by  the  manufacturer to read in either specific gravity or in grams per liter and are calibrated at a standard temperature of 68°F (20°C). Other needed items are a dispersion cup and stirrer (fig. 13-15), a thermometer accurate to 1°F (0.5°C), and a clock, or watch, with a second hand. Sample Preparation and Test Procedure Samples for hydrometer analysis are taken from representative material finer than the No. 10 sieve. The approximate size of the sample varies according to the type of soil being tested. For clays and silty soils, you 13-16



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