_GENERAL DOCUMENTS - C1981017 (244)

Home Browse Search

'orr i son-i:nu a 3�n G ,3ny, lnc. October 25, 19 7 Page three from Trench 1 and Trench 2 :e; hin. 251 pour: s and '11 -, '`� g t <-.�9 rG ,T1dS res �cCt� ij we-re fractic:.ated on a Gilson _raker to determine the grain-size d_str'_11-_,ution OP the coal re__se _-.aterial. The test results _ llo,an on i;lure ' tale _ c:. a;1m 2 nr` Cie size was a out 6 inches for c a,.n Trench 1 consis7_ed of G3.3 ner;cnt gravel (plus No. 4 sieve), 39.2 percent sand (between the No. 4 and '_No. 200 sieves) , snd 17.5 percent non.plastic silt (minus No. 200 sieve) . Trench 2 test results indicate a gradation distribution of u7. 4 percent g_ra el, 35. 6 rerce--it sand, and 17.0 perc--nt nonplastic silt. Because of the SimilariLv in gradation diStriDufLion characteristics, the two large bulk samples were combined to form one composite sample for engineering properties testing. A detailed discussion of the laboratory testing procedures is presented in Appendix 1. Two types of compaction tests were performed on the coal refuse material-- a series of relative density tests which incorporated different maximum particle sizes, and an impact compaction test performed in accordance with ASTM Test Designation D1557-70, modified to yield 20,000 ft-lb/ft3 compactive energy. These test results are summarized below. COMPACTION CHARACTERISTICS--COAL REFUSE MATERIAL Maximum Optimum Minimum Maximum Particle Size Water Content Dry Density Dry Density Test Method (inches) M (pcf) (pcf) Vibratory a(ASTM D-2049) 6 --- 75.5 88.1 3b --- 74.0 89.6 1-1/2c --- 71. 8 93. 4 Compaction (ASTM D-1557) 1-1/2 c 8.0 ---- 91.5 Material test "as received." b Gradation corrected between 1-1/2-inch and 3-inch sizes to match "as received" gradation on the 1-1/2-inch size. cGradation corrected between 3/4-inch and 1-1/2-inch sizes to match "as received" gradation on the 3/4-inch size. W.A 111ANIER & ASUACE