Table of Contents
What is uniformity coefficient of soil?
uniformity coefficient (u-ni-form’-i-ty). A numerical expression of the variety in particle sizes in mixed natural soils, defined as the ratio of the sieve size through which 60% (by weight) of the material passes to the sieve size that allows 10% of the material to pass.
What is uniformity coefficient of sand?
The Uniformity Coefficient is D60/D10. Figure 2. Sieves with various-sized openings are used for sand analysis.
What is effective size and uniformity coefficient?
The effective size (D10) and uniformity coefficient (UC) are the principal characteristics of granular media treatment systems and are determined by a sieve analysis. The ideal sand media is a coarse sand with an effective size between 0.3 mm and 0.5 mm (#50 to #35 U.S. Standard sieves).
What is use of uniformity coefficient?
The uniformity coefficient (Cu) and the coefficient of gradation (Cc) are the measures of soil gradation. These coefficients help to classify the soil as well graded or poorly graded ones.
Is soil having uniformity coefficient more than 10 is called?
Answer: A soil having uniformity coefficient more than 10 is called well graded soil.
What is coefficient of uniformity and curvature?
The uniformity coefficient (Cu), curvature coefficient (Cc) and the effective size (D10) are the grading characteristics of the soil. These are the geometric properties of a grading curve that describe a particular type of soil.
How does uniformity coefficient work?
Uniformity Coefficient (UC) – This is defined as a ratio and is calculated as the size opening that will just pass 60% of the sand (d60 value) divided by the size opening that will just pass 10% of the sand sample (d10 value). ES is basically a value describing the average size of sand grains in a sand sample.
What is coefficient of curvature in soil?
The coefficient of Gradation is also known as the coefficient of curvature and It is given by. C c = D 30 2 D 60 × D 10. The slope of the gradation curve of the soil gives the coefficient of curvature which represents the shape of the particle size distribution curve.
What is effective size of soil?
Effective Size represents a diameter that directly corresponds to the percentage, by weight, of grains that equal to 10% on the grain-size diagram. To illustrate, 10% of the soil sample particles are finer-grained, and 90% of the sample particles are coarser than the “effective size.”
What is coefficient of curvature of soil?
It is the parameter estimated using the gradation curve through sieve analysis. This parameter is used to classify the soil as well graded or poorly graded and is given by the relation as below.
What is D90 value?
D90: The portion of particles with diameters below this value is 90%. Volume percentage: The highest volume percentage of the particle size distribution displayed.
For which graded soil uniformity coefficient should lie between 1 and 3?
well-graded soil
Explanation: The coefficient of curvature should lie between 1 and 3 for well-graded soil.
What is the difference between coefficient of uniformity and coefficient of curvature?
The coefficient of uniformity or the CU is the ratio of the D60 by D10, if the ratio is greater than 4, then the soil is considered as good quality soil. But if the ratio is less than 4 then the soil is considered as bad quality soil. On the other hand, the coefficient of curvature is the ratio of (D30)2/(D10.
What is a good uniformity coefficient for soil?
The uniformity coefficient (Cu) is defined as the ratio of D60 to D10. A value of Cu greater than 4 to 6 classifies the soil as well graded. When Cu is less than 4, it is classified as poorly graded or uniformly graded soil.
What is the CU value of the uniformity coefficient?
The uniformity coefficient (Cu) is defined as the ratio of D60 to D10. A value of Cu greater than 4 to 6 classifies the soil as well graded. When Cu is less than 4, it is classified as poorly graded or uniformly graded soil. Uniformly graded soil has identical particles with Cu value approximately equal to 1.
What is the difference between uniformity coefficient and coefficient of gradation?
The uniformity coefficient (Cu) and the coefficient of gradation (Cc) are the measures of soil gradation. These coefficients help to classify the soil as well graded or poorly graded ones. The uniformity coefficient (Cu) is defined as the ratio of D60 to D10.
What is the difference between D50 and uniformity coefficient?
Average particle diameter (D 50) is the average particle diameter of the soil. Uniformity coefficient (C u) is a numerical measure to help interpret the distribution of particle sizes.