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CivilSoil Mechanics
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In liquid limit test the height of fall of cup is kept as

A

cm

B

cm

C

cm

D

cm

Correct Answer

тЪЩя╕П TE тАв Technical Concept & PrincipleCivilSoil Mechanics
Option A

cm

Quick Summary:

In the Casagrande's liquid limit apparatus, the standard height of fall of the cup is precisely 1 cm. This standardization is critical to ensure uniformity in the shearing energy imparted to the soil sample during the test across different laboratories.

тЪЩя╕ПTETechnical SolutionConcept & Principle
ЁЯТб Explanation

In the Casagrande's liquid limit apparatus, the standard height of fall of the cup is precisely 1 cm. This standardization is critical to ensure uniformity in the shearing energy imparted to the soil sample during the test across different laboratories.

ЁЯФв Key Formulas

Hf=10┬аmmH_f = 10 \text{ mm}HfтАЛ=10┬аmm тАФ Standard height of fall defined by IS 2720 (Part 5)

тЪЩя╕П Working Principle

The apparatus uses a hand-operated crank to lift the brass cup, which then drops onto a hard rubber base. The 1 cm drop height ensures that the energy per blow is consistent, allowing the soil to flow under a controlled impact, which is essential to define the moisture content at which 25 blows are required to close a standard groove.

ЁЯУМ Key Points
  • тЦ╕

    The liquid limit (LL) is defined as the water content at which a groove closes over 12.7 mm after 25 blows.

  • тЦ╕

    The apparatus must be calibrated using a gauge block to verify the 1 cm height.

  • тЦ╕

    Any variation in the fall height significantly alters the blow count, leading to erroneous LL results.

тЬЕ Advantages
  • тЦ╕

    Ensures consistency across global geotechnical testing

  • тЦ╕

    Repeatability of results for soil classification

тЭМ Disadvantages / Limitations
  • тЦ╕

    Human error in manual cranking

  • тЦ╕

    Requires frequent calibration of the base hardness and drop height

ЁЯЫая╕П Applications / Uses
  • тЦ╕

    Determining the consistency limits of fine-grained soils

  • тЦ╕

    Classification of soils according to the Unified Soil Classification System (USCS)

ЁЯУД Additional Information
  • тЦ╕

    The hard rubber base of the apparatus has a Shore D hardness of 90-95.

  • тЦ╕

    The tool used for creating the groove is typically the Casagrande grooving tool or ASTM tool.

ЁЯУК Diagram / Illustration
Standard Height of FallDrop = 1.0 cmBrass Cup10 mm
тЬЕ

A is correct тАФ The standard drop height for the brass cup in the liquid limit test is exactly 1 cm (10 mm).

Core Concepts Used
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Liquid Limit Atterberg Limits Soil Mechanics
ЁЯТб EXAM TIP

Remember that the liquid limit is defined at 25 blows; if a question asks about the drop height of the falling cone apparatus (used for plastic limit or alternative LL), that value is different (often 20 mm).

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