The document presents a presentation on soil identification techniques within the field of geotechnical engineering by students from Mymensingh Engineering College. It covers various tests and classifications for determining soil characteristics essential for construction. The conclusions highlight the importance of practical observation of soil, emphasizing that although it provides initial insights, precise soil testing is crucial for accurate results.

1. Welcome

2. 1
Mymensingh Engineering College
Department of Civil Engineering
Course Name: Geotechnical Engineering Sessional
Course Code: CE-506

3. Presentation Topic
Field Identification of Soil
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4. Md Mahmudur Rahman (501)
Nosrat Zahan Shishir (502)
Siam Ul Badhon (503)
Ibrahim Khalil Maruf (504)
Md Rabiul Islam (505)
S M Didarul Alam (507)
Presented by
Abdullah Al Mahin
Lecturer
Dept. of Civil Engineering
Mymensingh Engineering
College
Presented to
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5. Content
General Intro
Theory
Experimental Part
 Objective
 Significance
 Apparatus
 Discussion
 Question and Answer Session
 Data sheet
 Result Conclusion
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 Grain size distribution
 Shape of soil
 Dispersion test
 Dry Strength test
 Di-latency Test
 Toughness Test
 Moisture condition
 Color and odor

6. General Intro
Visually classification of soil
Objective
Determination of soil particle for constructional purposes
To identify and describe subsoil condition
Significance
For identification of soils in the planning stages of a project.
For getting a general idea about the future of constructional works.
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7. General Intro
Apparatus
Spatula Hammer Beaker
Glass rod Steel Rod 6

8. Theory
Grain Size Distribution
Fines
(<.07
5)
Fine Sand
(.075-.42mm)
Medium Sand
(0.42-2 mm)
Coarse sand(2-4.75mm)
Fine gravel(4.75-19 mm)
Coarse gravel (>19 mm)
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9. Theory
Shape of soil
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Major soil constituents more
than 50% of sand
Soil may be classified as:
 Rounded
 Sub-rounded
 Angular
 Sub-angular

10. Theory
Dispersion Test
Major soil constituents more than 50% of
silt and clay
 Sand particles - settle in 30 to 60 sec.
 Silt particles - settle in 15 to 60 min.
 Clay particles - remains in suspension
for at least several hours or several
days.
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11. Theory
Dry Strength Test
None -crumbles into powder with the slightest
handling pressure.
Low- crumbles into powder with some pressure
from finger.
Medium- break into pieces or crumbles with
considerable finger pressure.
High - cannot be broken with finger pressure.
Break into pieces between thumb and hand
surface.
Very High The dry specimen cannot be broken
between the thumb and hard surface.
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12. Theory
Di-latency Test
Clay- There is no visible
change in soil samples.
Water appears slowly on the
surface of the specimen
during shaking.
Silty Soil- Rapid Water
appears quickly on the
surface of the specimen
during shaking
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13. Theory
Toughness Test
Non-plastic
Thread cannot be rolled at any water
content.
Medium Plastic
The thread is easy to roll and not much
time is required to reach the plastic
limit.
High
Easy rolling and can be rolled several
times
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14. Theory
Moisture Condition
• Dry to touch and dusty
Dry
• Damp and slightly begin to retain molded form
Moist
• Clearly wet and water is visible
Wet
• Easy visibility of water and draining freely
Saturated
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15. Theory
Color & Odor Test
Organic
• Color- black or browny
• Odor- fresh, pleasant or no odor
Inorganic
• Color- redish or yellow or light
• Odor- like ammonia or rotten odor
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16. Experimental Part
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Data & Result
Test Name Observation Result
Grain Size <0.075mm
Inorganic
Clayey Silt
Dispersion 18 min 40 sec
Dry Strength Low to medium
Di-latency Rapid
Toughness Medium
Color Light
Odor Rotten
Moisture Moist

17. Conclusion
Discussion
This test is for sample observation of soil at sight. It does not give
actual result. Accuracy depends on personal experience. For
exact result, soil test is to be done.
But this experiment gives an idea to say instantly about the
construction of a structure. And little mistakes or errors do not
vary much in the long run.
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18. Thank
you

19. Question
&
Answer