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10 <br />• n w~WO (15] <br />where Ww ~ saturated veight in air <br />Wo ~ dry veight in air <br />V ~ volume <br />Moisture. The moisture content of a material was deter- <br />mined relative to the condition of the material as it was <br />received in the laboratory. A sample of material was weighed <br />and then dried overnight. The moisture content was then deter- <br />mined as follows: <br />m ~ WWRD [16J <br />where WR ~ weight as received <br />WD ~ dry weight <br />Slake Potential. The slake potential test is used to <br />estimate the decomposition characteristics of a rock sample <br />subjected to alternating wet and dry conditions. The test in- <br />volves measuring the initial sample weight and the sample weight <br />after each of a series of sample wettings and dryings. The per- <br />centage weight loss per wet-dry cycle is plotted and provides a <br />scale of 0(no slaking potential) to 10(very extreme slaking <br />potential) is subjectively estimated. <br />Swell Potential. The swell potential test is used to <br />estimate the swelling characteristics of a rock sample subjected <br />to water immersion conditions. The test involves the measure- <br />ment of the axial strain of a carefully prepared rock cylinder <br />as a function of time. The rock cylinder is placed in a metal <br />device which confines the cylinder in the diametral direction. <br />The rock sample and surrounding confinement device are then sub- <br />merged in water which saturates the exposed rock sample ends. <br />Small holes in the confinement device allow water to enter the <br />sides of the rock sample. Measurements of sample length are <br /> <br />SEEGMILLER INTERNATIONAL <br />