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25 APPENDIX A- INSTRUCTIONS AND DATA SHEET FOR INTERLABORATORY STUDY
26 INSTRUCTIONS TO THE PARTICIPANTS OF ILS FOR THE PRECISION ESTIMATES OFAASHTO T180, MOISTUREâDENSITY RELATIONS OF SOILS USING A 4.54-KG (10-LB) RAMMER AND A 457-MM (18-IN.) DROP Each lab should have received total of 12 bags: a. Three bags of fine graded aggregate (Grading E) with silt b. Three bags of fine graded (Grading E) aggregate with clay c. Three bags of coarse graded (Grading A) aggregate with silt d. Three bags of coarse graded aggregate(Grading A) with clay The fine graded samples are used with Method B and the coarse graded samples are used with method D of AASHTO T 180. For testing the fine graded samples follow Steps 1 through 4 and for testing coarse graded samples follow Steps 5 through 8. Testing of fine graded blends 1. Dry the content of each bag in 60°C (140°F) oven. Then break up the aggregation in such a manner as to avoid reducing the natural size of individual particles. 2. Sieve the aggregate-soil blend over the 4.75-mm sieve. Discard the coarse material, if any, retained on the 4.75-mm sieve. 3. Select a representative sample, with a mass of approximately 7 kg (16 lb) or more. 4. Prepare and Compact the specimens in accordance with Section 7, which also follows Section 5 of T 180. a. For the first compaction add 3.5% water (i.e., 3.5% of 7 kg = 245 g (cc)). b. Increase the moisture by 1.5% for each subsequent compaction. c. Total of 5 compactions shall be conducted at 3.5%, 5%, 6.5%, 8%, and 9.5 % water contents. d. For water content determination use 150-g samples and follow AASHTO T 265. Testing of coarse graded blends 5. Dry the content of each bag at 60°C (140°F) oven. Then break up the aggregation in such a manner as to avoid reducing the natural size of individual particles. 6. Sieve the aggregate-soil blend over the 19-mm sieve. Discard the coarse material, if any, retained on the 19-mm sieve. 7. Select a representative sample, with a mass of approximately 11 kg (25 lb) or more. 8. Prepare and Compact the specimens in accordance with Section 11, which also follows Section 9 of T 180.
27 a. For the first compaction add 2% water (i.e., 2% of 11 kg = 220 g (cc)). b. Increase the moisture by 1.5% for each subsequent compaction. c. Total of 5 compactions shall be conducted at 2%, 3.5%, 5%, 6.5%, and 8% water contents. d. For water content determination use 350-g samples and follow AASHTO T 265. Calculation and Report 9. Please use the attached Excel worksheet to calculate and report the data. a. Use one excel file for the three replicates of each material. The data for the four materials shall be reported in four separate excel files. Please rename the files to match the sample names. b. Use aggregate specific gravity of 2.715 for the coarse blend and 2.682 for the fine blend. c. Record the measurements with the precisions requested in the worksheet. 10. Report the optimum moisture content, as a percentage, to the nearest tenth of a percent. 11. Report the maximum density in pounds per cubic feet to the nearest tenth. 12. Please send the four excel files to AMRL through email: hazari@amrl.net.
28 WORKSHEET FOR ENTERING T 180 ILS DATA Date: Specific Gravity of Soil Water Content % 2.0% 3.5% 5.0% 6.5% 8.0% Container ID 1 2 3 4 5 Mass of Can + Wet Soil (g) to the nearest tenth Mass of Can + Dry Soil (g) to the nearest tenth Mass of Can (g) to the nearest tenth Mass of Soil + Mold (g) to the whole number Mass of Mold (g) to the whole number Mass of Soil in Mold (g) 0 0 0 0 0 Mass of Water (g) 0 0 0 0 0 Mass of Dry Soil (g) 0 0 0 0 0 Water Content (%) #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! Wet Unit Weight (lb/ft^3) 0 0 0 0 0 Dry Unit Weight (lb/ft^3) #DIV/0! #DIV/0! #DIV/0! #DIV/0! #DIV/0! Maximum Density (lb/ft^3): Optimum Moisture Content (%): Moisture Density AASHTO T180 Name: Input data only into yellow cells!
