Page 344 - Facility Piping Systems Handbook for Industrial, Commercial, and Healthcare Facilities
P. 344
SITE UTILITY SYSTEMS
Curvature C c
Coefficients Uniformity C u
Atterberg limits PI LL <4 or <A line <7 and >A line >4 or <A line >7 and >A line <4 or <50 <A line >7 and >A line <A line >50 >A line <4 or <50 <A line <A line >50
No. 200 (0.075) 12 to 50 >50 >50 >50
Percentage passing sieve sizes No. 4 (4.75 1 1/2 in mm) (40 mm) <50 of “coarse 100 fraction” >50 of “coarse fraction” 100 100 100 100 100 100
Classification of Soils for Embedment and Backfill (Continued)
Silty gravels, gravel-sand-silt mixtures. Clayey gravels, gravel-sand-clay mixtures. Silty sands, sand-silt mixtures. Clayey sands, sand-clay mixtures. Inorganic silts and very fine sands, rock flour, silty or clayey fine sands, silts with Inorganic clays of low to medium plasticity, gravely clays, sandy clays, silty clays, lean Inorganic silts, micaceous or diatomaceous fine sandy or
Description slight plasticity. clays. plasticity. organic silts. Note: “Coarse fraction” as used in this table is defined as material retained on a No. 200 sieve.
Soil group symbol D2487 GM GC SM SC ML CL MH CH OL OH PT Source: Copyright ASTM. Reprinted with permission.
Coarsegrained soils with fines Fine-grained soils (inorganic) Fine-grained soils (inorganic) Organic soils Highly organic
TABLE 6.20 Type Class III IVA * IVB V
6.66
Downloaded from Digital Engineering Library @ McGraw-Hill (www.accessengineeringlibrary.com)
Copyright © 2009 The McGraw-Hill Companies. All rights reserved.
Any use is subject to the Terms of Use as given at the website.
