SU0004714 - Laserfiche WebLink

Home Browse Search

r./ 39 Import materials to be used for structural fill should meet the following requirements: o Non-expansive (EI < 5) o Maximum percentage of fines (less than #200 sieve size) < 30% o Free of organics o Maximum particle size per prior requirements for use of on-site mate- rials Laboratory Compaction Test Results. Compaction tests (ASTM D 1557) , were performed on bulk samples of the surficial silty sand and on a mixture of 80 percent silty sand and 20 percent glass fragments. The measured maximum dry densities and optimum water contents are: Maximum Dry Density Optimum Water Content Silty sand 127.5 pcf 98 808 silty sand; 208 glass 133.0 pcf 78* *Note the optimum water content of the sand-glass blend is relative to the combined dry weight of the sand and glass. We consider these values of maximum dry density and optimum water content to be generally representative of the surface silty sand. The approximate range of shrinkage factors for dry to slightly moist surficial soils is 5 to 12 percent. The shrinkage factor where glass-filled trenches are replaced by compacted fill is estimated to be 10 to 12 percent. Field Compaction Requirements. The fill material should be placed in horizontal layers, unless recommended otherwise, and should not exceed 8 inches in loose thickness. Each layer should be spread evenly, moisture conditioned, processed, and compacted to obtain a uniformly dense layer. The fill should be compacted to a minimum dry density of 90 percent of the maximum dry density obtained by ASTM D 1557 standard test. The compaction should be performed at a moisture content between 1 percent below and 2 percent above the optimum moisture content. Moisture control procedures should be planned for field compaction control of on-site soils that contain glass. The fill moisture during spreading may have to be slightly higher than 2 percent above the optimum because of the rapid drying off of glass surfaces. 1144A/CC-39 :i McClelland