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• <br /> <br />• <br />April 1989 <br />'T'ABLE 3.4.A.9 COMPARISON OF UNIAXIAL COMRESSIVE STRENGTH <br />TEST DATA BETWEEN PREVIOUS AND PRESENT STUDY <br /> Previous Studies Present Study <br />F Seam roof *Avg = 14,000 9,655 <br /> S = 6,150 7,260 <br /> N = 10 7 <br /> COV = .44 .75 <br />F Seam floor Avg = 9,730 7,940 <br /> S = 5,700 5,250 <br /> N = 34 3 <br /> COV = .59 .66 <br />E Seam roof Avg = 11,900 7,640 <br /> S'= 2,540 5,670 ' <br /> N = 27 15 <br /> COV = .63 .74 <br />E Seam floor Avg = 9,380 3,016 <br /> S = 4,350 204 <br /> N= 7 2 <br /> COV = .46 .07 <br />B Seam roof Avg = 10,390 9,130 <br /> S = 3,600 5,610 <br /> r] = B 16 <br /> COV = .35 .61 <br />B Seim roof Avg = 7,190 6,630 <br /> S = 4,170 2,400 <br /> N = 4 ~ B <br /> COV = .58 .36 <br />* Avg = Average, psi S = Standard Deviation, psi <br />rl = rlttmher ~F tests COV = Coefficient of variation <br /> <br />