Soil Plasticity and Shrinkage Limit Test Quiz
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Questions and Answers

In the shrinkage limit test using the Wax Method, what is the purpose of coating the inside of the dish with petroleum jelly?

  • To prevent water evaporation
  • To facilitate the removal of the soil pat (correct)
  • To increase the volume capacity of the dish
  • To enhance the accuracy of the volume measurement
  • How is the volume of the soil pat determined in the Shrinkage Limit Test using the Wax Method?

  • By displacing water using wax
  • By measuring the change in weight after drying
  • By measuring the volume displacement of water (correct)
  • By measuring the displacement of wax
  • What is the purpose of tapping the shrinkage dish lightly on the tabletop in the Shrinkage Limit Test?

  • To compact the soil paste
  • To enhance volume measurement
  • To remove air pockets (correct)
  • To increase moisture content
  • What method is used to determine the volume capacity of a relatively cylindrical shrinkage dish?

    <p>Caliper measurement</p> Signup and view all the answers

    What is the purpose of preparing a uniform paste of soil and water in the Shrinkage Limit Test?

    <p>To prevent cracking during drying</p> Signup and view all the answers

    What is the formula to compute the shrinkage limit using the wax method?

    <p>SL = (Vi - Vf) / (M1 - M2) * 100%</p> Signup and view all the answers

    What does the shrinkage ratio represent?

    <p>The ratio of volume change of soil to change in moisture content</p> Signup and view all the answers

    How can the specific gravity of soil solid be determined from the shrinkage limit and shrinkage ratio?

    <p>G = 1 / (SL * SR)</p> Signup and view all the answers

    In the shrinkage limit example problem, what was the initial volume of the soil?

    <p>20.2 cm3</p> Signup and view all the answers

    What do M1 and M2 represent in the context of the shrinkage limit computation formula?

    <p>M1 = Mass of moist soil, M2 = Mass of dry soil</p> Signup and view all the answers

    What does the plastic limit test determine in soil?

    <p>The moisture content where the transition from semisolid to plastic state occurs</p> Signup and view all the answers

    How is the liquid limit defined in the plastic limit test using the fall cone method?

    <p>By the moisture content where a cone penetrates 20 mm in 5 seconds</p> Signup and view all the answers

    What is the purpose of rolling out a thread in the plastic limit test according to ASTM D4318?

    <p>To observe the behavior of the soil at different moisture contents</p> Signup and view all the answers

    What is the formula for calculating the plasticity index (PI) of a soil?

    <p>$\text{PI} = \text{Liquid Limit} - \text{Plastic Limit}$</p> Signup and view all the answers

    How is the plastic limit of a soil defined?

    <p>As the moisture content where a thread retains its shape down to 3.2mm diameter</p> Signup and view all the answers

    What does the plasticity index signify in terms of soil classification?

    <p>It denotes the difference between Atterberg limits</p> Signup and view all the answers

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