Soil classification based on the particle size distribution is_____________
Soil classification of composite soils exclusively based on the particle size distribution is known as textural classification.
The best known classification system in textural classification is__________
Triangular classification of U.S. public road administration is a commonly used system for textural classification.
Textural classification is most suitable for____________
Since the textural classification is based on the percentages of sand, silt, and clay size making up the soil .such a classification is more suitable for describing coarse-grained soil.
To use textural classification chart,___________lines must be drawn.
to use the textural classification chart, for a given percentages of three constituents forming a soil, lines are drawn parallel to three sides of the equilateral triangle.
The type of triangle, used in textural classification of soil is_____________
A triangle, having equal length of sides (i.e. Equilateral triangle) is used in textural classification chart.
Public road administration (PRA) system is based on_____________
HRB classification system, also known as public road administration (PRA) is based on both the particle-size composition and plasticity characteristics.
Highway research board (HRB) classification system is also known as__________
Highway research board classification system is also known as public road administration (PRA) system.
Based on HRB classification system, the soil are divided in to___________
Based on HRB system, the soil is divided into 7 primary groups, designated as A-1, A-2…A-7.
The performance of the soil, when used for pavement construction is found out by using_____________
As group index is a mean of rating the value of a soil as a sub-grade material
It can be used for finding the performance and quality of the soil.
The group index of a soil depends on____________
Group index of a soil usually varies by
1. Liquid limit
2. Plastic limit
3. Amount of material passing through the 75-micron IS sieve.