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Questions and Answers
Which of the following is defined as the volume of voids to the volume of solids?
Which of the following is defined as the volume of voids to the volume of solids?
A soil is considered saturated when the degree of saturation is what percentage?
A soil is considered saturated when the degree of saturation is what percentage?
What is the relationship between emax and emin for clean sand samples?
What is the relationship between emax and emin for clean sand samples?
If a soil has a void ratio of 0.5, its porosity can be calculated as which of the following percentages?
If a soil has a void ratio of 0.5, its porosity can be calculated as which of the following percentages?
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What type of soil primarily features a plastic limit that indicates the transition from plastic to liquid state?
What type of soil primarily features a plastic limit that indicates the transition from plastic to liquid state?
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The specific gravity of soil solids is defined in relation to which of the following?
The specific gravity of soil solids is defined in relation to which of the following?
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The water content of soil at the transition point from liquid to plastic state is known as what?
The water content of soil at the transition point from liquid to plastic state is known as what?
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Which value is not usually expressed as a percentage among the following options?
Which value is not usually expressed as a percentage among the following options?
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What is the primary purpose of the activity defined as the slope of the line correlating plasticity index and percent finer than 2μ?
What is the primary purpose of the activity defined as the slope of the line correlating plasticity index and percent finer than 2μ?
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Which soil type is capable of having an in situ moisture content that exceeds its liquid limit?
Which soil type is capable of having an in situ moisture content that exceeds its liquid limit?
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If the natural moisture content of heavily overconsolidated soil is less than the plastic limit, what can be inferred about the liquidity index?
If the natural moisture content of heavily overconsolidated soil is less than the plastic limit, what can be inferred about the liquidity index?
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What does the A-line on the plasticity chart differentiate?
What does the A-line on the plasticity chart differentiate?
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The equation representing the A-line on the plasticity chart includes which parameter?
The equation representing the A-line on the plasticity chart includes which parameter?
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Which factor is primarily evaluated when considering the degree of saturation in soils?
Which factor is primarily evaluated when considering the degree of saturation in soils?
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How is the relationship between void ratio, degree of saturation, and water content defined?
How is the relationship between void ratio, degree of saturation, and water content defined?
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Specific gravity in the context of soil properties refers to what?
Specific gravity in the context of soil properties refers to what?
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What does the void ratio of soil represent?
What does the void ratio of soil represent?
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Which of the following statements correctly describes porosity?
Which of the following statements correctly describes porosity?
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How is the degree of saturation in soil defined?
How is the degree of saturation in soil defined?
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What does specific gravity of soil represent?
What does specific gravity of soil represent?
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Which of the following statements is true about Atterberg limits?
Which of the following statements is true about Atterberg limits?
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A soil with a high plasticity index indicates that it is:
A soil with a high plasticity index indicates that it is:
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If the moisture content of soil exceeds the liquid limit, it is described as:
If the moisture content of soil exceeds the liquid limit, it is described as:
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To decrease the degree of saturation of a soil sample, one would need to:
To decrease the degree of saturation of a soil sample, one would need to:
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Study Notes
Soil Classification Systems
- Soil classification systems provide a universal method for describing soil characteristics concisely.
- Classification systems are primarily based on the grain-size distribution and plasticity of the soil.
AASHTO Soil Classification System
- The American Association of State Highway Officials (AASHTO) classification system categorizes soils into nine major groups.
- Granular materials are defined as soils with 35% or less passing through a 75 μm sieve.
- Soils in groups A-4, A-5, A-6, and A-7 have a general subgrade rating of fair to poor.
- Soils are considered silty when the fine fractions have a plasticity index of 10 or less.
Group Index (GI)
- The Group Index (GI) is a numerical value based on the percent passing 75 μm, liquid limit, and plasticity index.
- If GI is negative, it is assumed to be 0.
- If GI is a decimal, it is rounded up to the nearest whole number.
- Soils belonging to group A-3 have a Group Index of 0 by definition.
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Description
This quiz explores various soil classification systems, focusing on the AASHTO system and the Group Index (GI) concept. Understand how soil characteristics are defined and categorized for engineering purposes. Test your knowledge on the classification criteria and their implications.
