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Modified Slake Durability Test for Erodible Rock Material
The slake durability index (ASTM D4644-08) measures the response of rock fragments to submerged tumbling action. This test was modified to eliminate oven drying, extend test-increment duration, and increase the number of test increments to better reflect conditions in rock-bed stream channels. The results are expressed as a linear dimension taken to represent equivalent scour depth and normalized cumulative power taken to represent equivalent stream power. Sample loss during the first test increment is dominated by rounding of fragment edges and corners; hence, it is disregarded. Subsequent test increments display a linear trend, the slope of which is defined as the `geotechnical scour number'. The geotechnical scour number of thinly bedded siltstone is similar to an `empirical scour number' calculated from measured scour and cumulative stream power for the same location. Scour numbers for other rock types were consistent with observed channel behavior suggesting that the modified slake durability test may be valuable for predicting scour at bridge sites.
Modified Slake Durability Test for Erodible Rock Material
The slake durability index (ASTM D4644-08) measures the response of rock fragments to submerged tumbling action. This test was modified to eliminate oven drying, extend test-increment duration, and increase the number of test increments to better reflect conditions in rock-bed stream channels. The results are expressed as a linear dimension taken to represent equivalent scour depth and normalized cumulative power taken to represent equivalent stream power. Sample loss during the first test increment is dominated by rounding of fragment edges and corners; hence, it is disregarded. Subsequent test increments display a linear trend, the slope of which is defined as the `geotechnical scour number'. The geotechnical scour number of thinly bedded siltstone is similar to an `empirical scour number' calculated from measured scour and cumulative stream power for the same location. Scour numbers for other rock types were consistent with observed channel behavior suggesting that the modified slake durability test may be valuable for predicting scour at bridge sites.
Modified Slake Durability Test for Erodible Rock Material
Keaton, Jeffrey R. (author) / Mishra, Su K. (author)
International Conference on Scour and Erosion (ICSE-5) 2010 ; 2010 ; San Francisco, California, United States
Scour and Erosion ; 743-748
2010-10-29
Conference paper
Electronic Resource
English
Modified Slake Durability Test for Erodible Rock Material
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