What does coefficient of curvature tell us?

The coefficient of curvature is a measure of gradation of particles and given by the following expression: Cc = (D30)2/D60.D10. Where, D60 = Size of the particle corresponding to 60\% finer. D30 = Size of particle corresponding to 30\% finer.

What is the importance of soil grading curve?

Soil gradation is an important aspect of soil mechanics and geotechnical engineering because it is an indicator of other engineering properties such as compressibility, shear strength, and hydraulic conductivity.

What is the value of coefficient of curvature CC for well graded soil?

between 1 and 3
Detailed Solution. Explanation: The coefficient of curvature should lie between 1 and 3 for well-graded soil. 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 the coefficient of curvature in soil classification?

Curvature coefficient, Cu > 5 indicates a well-graded soil, i.e. a soil which has a distribution of particles over a wide size range. Cc between 1 and 3 also indicates a well-graded soil. Cu < 3 indicates a uniform soil, i.e. a soil which has a very narrow particle size range.

Which of the following expression represent the correct value of coefficient of curvature?

Explanation: Coefficient of the curvature Cc represent the shape of the particle size curve given by CC = (D40)2/D10×D30.

How is uniformity coefficient calculated?

The size distribution is represented by the Uniformity Coefficient, which enables you to see how well graded your sand sample is. This is done by taking the D60 and dividing by the D10.

What is a coefficient of uniformity?

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.

How is the uniformity coefficient of soil calculated?

What is the CC and Cu value for the well graded sand SW )?

A well graded soil has Cc between 1 and 3 as long as Cu is also greater than 4 for gravels and 6 for sands.

What is uniformity coefficient?

Uniformity Coefficient (Cu) which is a measure of the uniformity of grain size in the soil and is defined as the ratio of the 60\% finer size (D60) to D10.

Which statement is applicable for D30 represent in grading of soil?

D30 – 30\% of the particles are finer than this size.

Which of the following tubes are used in the constant head test?

7. Which of the following tubes are used in the constant head test? Explanation: The constant head test apparatus consists of three tubes: the inlet tube, the overflow tube and outlet tube.