Laserfiche WebLink
.~ <br /> <br /> <br /> <br /> <br /> <br />• <br /> <br />J <br />21 <br />weighed to determine moisture content at 15 bars. Finally, the core <br />samples were oven dried at 105oC for 24 hours and bulk density was <br />determined: <br />bulk density(g/cm3) oven dry weight of sample (q} <br />volume of sample (cm3) <br />Moisture contents, percent by weight; at saturation, 1/3 bar, and 15 <br />bars were determined: <br />moisture content = moist sample wt. - oven dry wt. <br />oven dry weight <br />Particle Size Distribution <br />Coarse fragments greater than 2 mm in size were determined by passing <br />the samples, after they had been oven dried, through a 2 rtrn sieve. <br />However, certain spoils samples consisted entirely of coarse sandstone <br />or shale which was originally part of the overburden. .Since these rocks <br />are subject to intense weathering which will break apart the rock frag- <br />ments when they are at or near the surface of the regraded land, all <br />the spoils samples were manually ground with a mortar and pestle, then <br />passed through the 2 mm sieve. Any material which could not be easily <br />ground down into its smaller fundamental particle sizes (sand, silt, and <br />clay) with the mortar and pestle and which would not pass through the <br />2 mm sieve was considered to be coarse fragments. The coarse fragments <br />greater than 2 mm were then expressed as a percent of the total sample <br />by weight. <br />The fine material which passed through the 2 mm sieve was prepared <br />I <br />for the hydrometer method of particle size analysis by placing it in a <br />