Abstract
The importance of particle shape, when considering the engineering behavior of sand, has been well-documented. Angular sands tend to have greater maximum and minimum void ratios, a larger friction angle, and a greater compressibility potential than their rounded counterparts under similar conditions. These differences in particle shape affect the behavior of the sands during in situ testing and in estimating soil behavior in a number of other capacities. This paper compares the results of roundness (R) and sphericity (S) estimates of ten individual particles and then later collectively on six sand specimens by several observers. An existing visual comparison method, manual methods, and automated methods are used to classify particle shape. Coefficient of variation (CV) values between 9 and 45% were obtained between the observers for visual estimates of single particles and of collective observations of sand specimens. These results are within CV values obtained when estimating other geotechnical parameter...
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