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Publication Number: FHWA-HRT-04-079
Date: July 2006

Seasonal Variations in The Moduli of Unbound Pavement Layers

Appendix C: Between-User Differences in Application of Eicm Version 2.6

Table 69. Between-user differences in the application of EICM Version 2.6
Section Input Parameter Author’s Application NCHRP 1-37A Application[19]
041024 Climatic region (windspeed and percent sunshine) III-B III-A
Depth to water table 152.4 m 90 m
Number of elements in AC layer 5 6
Number of elements in base layer 12 5
Base specific gravity Not entered 2.65
Base dry unit weight (gm/cm3) 2.28 2.23
Base PI Not entered 0
Base p200 Not entered 9.3
Number of subgrade sublayers 11 10
Subgrade specific gravity Not entered 2.7
081053 Climatic region (windspeed and percent sunshine data) III-A II-A
Length of analysis period (days) 571 365
Number of elements in AC surface 4 3
Number of elements in base layer 7 3
Specific gravity Not entered 2.65
Base plasticity index 0 Not entered
Base percent passing 200 Not entered 8.9
Equilibrium moisture content 15.8 16
Number of subbase sublayers 5 4
Subbase specific gravity Not entered 2.65
Subbase PI Not entered 0
Subbase p200 Not entered 9.4
091803 Number of base layer elements 14 8
Base layer specific gravity Not entered 2.65
Base P200 Not entered 5.8%
Equilibrium volumetric water content 21.25 22
Dry thermal K 4.47 6
Heat capacity 0.17 0.21
Subgrade dry density 1.64 2.06
Subgrade PI Not entered 0
Subgrade P200 Not entered 12.6
Subgrade porosity Not entered 0.34 sublayer 3,
0.28 sublayers 4-6
131005 Simulation start date and analysis period 9/20/95
365 days
8/8/95
435 days
Base percent fines 8.9 9
Base percent gravel 52 59
Base percent sand 39.1 32
Number of elements in base layer 10 5
Base specific gravity Not entered 2.65
base pi Not entered 0
Base percent passing 200 Not entered 8.9
Equilibrium water content (due to different initial date) 15.77 16.2
Number of upper subgrade sublayers 6 4
Number of lower subgrade sublayers 6 5
Upper subgrade specific gravity Not entered 2.68
Lower subgrade specific gravity Not entered 2.73
Lower subgrade PI Not entered 20
Lower subgrade p200 Not entered 50
Lower subgrade dry density 1.5 2.0
Upper subgrade equilibrium water content (due to different initial date) 21.6, 19.7, 18.97,19.5, 16.93, not entered 19.55, 16, 14.85, 15.6
Lower subgrade equilibrium water content (due to different initial date) 18.37, 12.23, 10.5, 10.8, not entered 13.5, 16.4, 10.45,9.55, 9.3, not entered
231026 Emissivity factor 0.9 0.93
AC thickness (cm) 16.3 16
Number of elements in base layer 18 10
Base specific gravity Not entered 2.65
Number of subgrade sublayers 8 7
Subgrade PI Not entered 0
Subgrade P200 Not entered 12.6
Subgrade porosity Not entered 0.3
271018 Base percent gravel 45 43
Base percent sand 47.5 49.5
AC thickness (cm) 11 11.2
Number of elements in base layer 4 3
Base porosity 0.24 Not entered
Equilibrium volumetric water content 13.3 13.4
Subgrade P200 Not entered 5.2
Subgrade specific gravity Not entered 2.65
331001 Emissivity factor 0.9 0.93
Base percent gravel 62.9 63
Base percent sand 32.5 32.6
Number of elements in AC layer 4 5
Number of elements in base layer 16 10
Base specific gravity 2.678 2.65
Equilibrium volumetric water content 9.6 9.7
Number of subbase sublayers 3 2
Subbase PI Not entered 0
Subgrade PI Not entered 0
481077 Simulation start date and analysis period 12/15/93, 365 days 4/10/94, 439 days
Base percent gravel 51 58
Base percent sand 42 35
Number of elements for AC layer 4 3
Number of elements for base layer 12 6
Base porosity 0.18 Not entered
Base PI Not entered 0
Base p200 Not entered 7
Base equilibrium water content 10.58 14.9
Subgrade PI Not entered 0
Subgrade P200 Not entered 73.6
Equilibrium subgrade moisture content 22.4, 26.83, 26.13,
28.23, 21.5, 21.03,
19.53, 19.23, 20.3,
not entered
26.7, 30.9, 29.7,
25.7, 22.1, 24.5,
22.4, 20.2, 20.4,
not entered
501002 Emissivity factor 0.9 0.93
Base percent fines 3.3 3.5
Base percent gravel 89.9 90
Base percent sand 6.8 6.5
AC thickness (cm) 22.4 21.1
Number of elements in AC layer 4 5
Number of elements in base layer 18 11
Base specific gravity Not entered 2.65
Base percent passing 200 Not entered 3.4
Base equilibrium volumetric water content 9.6 11
Number of upper subgrade sublayers 1 2
Upper subgrade specific gravity Not entered 2.65
Number of lower subgrade sublayers 8 6
Upper subgrade PI Not entered 0
Upper subgrade p200 Not entered 6.9
831801 Emissivity factor 0.9 0.93
Base percent fines 10.9 11
Base percent sand 37.1 37
AC thickness (cm) 5.6 11.5
Base specific gravity Not entered 2.65
Percent passing 200 Not entered 10.9
Base D60 25.6 Not entered
Subbase specific gravity Not entered 2.7
Subbase dry density 2.131 2.17
Subbase PI Not entered 11
Subbase p200 Not entered 10.5
Subbase D60 6 Not entered
Subgrade PI Not entered 0
Subgrade p200 Not entered 28.8
Subgrade porosity 0.4 Not entered
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The Federal Highway Administration (FHWA) is a part of the U.S. Department of Transportation and is headquartered in Washington, D.C., with field offices across the United States. is a major agency of the U.S. Department of Transportation (DOT).
The Federal Highway Administration (FHWA) is a part of the U.S. Department of Transportation and is headquartered in Washington, D.C., with field offices across the United States. is a major agency of the U.S. Department of Transportation (DOT). Provide leadership and technology for the delivery of long life pavements that meet our customers needs and are safe, cost effective, and can be effectively maintained. Federal Highway Administration's (FHWA) R&T Web site portal, which provides access to or information about the Agency’s R&T program, projects, partnerships, publications, and results.
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