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geothic eng lab report 1

  • TEXTBOOK : Hydrometer Analysis : Lab 5 in 8th, 9th edition
  • Objective : To determine Grain Size Distribution in a soil for the fraction that is finer than U.S. No.200 sieve size(0.075mm) using hydrometer analysis
  • ASTM hydrometer is calibrated up to a reading of 60 at T=20ºC for soil particles having Gs = 2.65
    • Hydrometer reading = 30? 30g of soil solids in suspension per 1000 ml of soil-water mixture at T=20ºC.
  • Corrections
    • Temperature Correction FT = -4.85+0.25T
    • Meniscus Correction Fm : the difference between the top and bottom of the meniscus.
    • Zero Correction Fz : Accounts for the effect of using a deflocculating agent.

    RatnaYesuraj CR, (2016, May 19). Lab #2A Hydrometer Analyis [Video]. YoutubeSubmit a lab report using experimental data presented below and given in Table 3-1.Fz = 4, Fm = 1, Gs = 2.75, a = 0.98, A= 0.0128Table 3-1. Hydrometer Analysis Data

    Time Hydrometer Reading Temperature
    0.25 49 23
    0.5 48 23
    1 46 23
    2 41 23
    4 35 23
    8 26 23
    15 20 23
    30 16 23
    60 13 23
    120 11 23
    1440 5 23

    Lab Report should

    1. Write down the procedures described in the video(RatnaYesuraj, 2016) and compare them with the procedures given in the laboratory textbook if necessary.
    2. Present the completed test table, sample calculations, and the grain-size distribution graph similar to that shown in Fig.5-6 in the textbook.
    3. Discussion section will include the semilogarithmic plot combining the results of sieve and hydrometer analysis (see step 9 and 10 in section 5.6) and the percentages of various fractions of gravel, sand, silt and clay, and clay-size particles present in the soil.
    4. Follow lab report guidelines under Modules/Lab Information on Canvas.

 
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