Question

Soil Mechanics ( please answer right ASAP )

2. The following are the results of a sieve analysis and a hydrometer analysis Mass Sieve number/grainretained Percent finer size 10 17 20 27 30 Sieve 54 40 60 129 140 90 200 53 0.045mm 12.1 7.8 0.028mm 0.015mm 0.005mm 0.0025mm 0.6 CE 341 Soil Mechanics NJIT Janitha Batagoda Summer 2019 Draw the grain-size distribution curve. a. Determine the percentages of gravel, sand, silt and clay according to the AASHTO system Determine the percentages of gravel, sand, silt and clay according to the USCS. d. b. c. Determine the uniformity coefficient and the coefficient of gradation. Would you call this a well graded, poorly graded, or gap graded soil? Explain e.

Answer 1

i am attaching graphs of grain distribution and corrosponding tables

retained mass(g) cummulative retained mass(g) % cummulative % finer % finer size(finer) % finer I size 12.1 3 0.724637681 99.27536 499.27536 0.045 10 95.16908 17 20 4.830917874 95.16908 0.028 27 47 11.352657 88.64734 20 88.64734 0.015 41 30 78.74396 8821.25603865 78.74396 0.005 142 54 34.29951691 65.70048 40 65.70048 0.0025 0.6 129 271 65.4589372 34.54106 60 34.54106 361 90 87.19806763 12.80193 140 12.80193 53 414 100 0 10 TOTAL MASS-414g

fine grained coarse grained 120 100 10 80 60 40 20 0.1 0.001 0.01 50 100 250 150 log(size of particles) size of particles
from graph of coarse grain it can be said that it is well graded because all sizes of particles are present(as graph is almost continuous)