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Publication Number: FHWA-HRT-06-121
Date: November 2006

Long-Term Pavement Performance (LTPP) Data Analysis Support: National Pooled Fund Study Tpf-5(013)

Appendix F. Specification and Pavement Design Summaries

Appendix F provides overviews of specifications and standard pavement designs for principal and rural interstate highways. The information was obtained from surveying the participating PFS as well as reviewing literature available on each SHA Web site.

Table 77. AC wearing course specification summary.
Pooled Fund StateHMAC ReferenceAC GradeMix DesignCompactionMix Voids (%)VFA (%)Min VMA (%)Max Agg. Size
AK HMA, Type II, Class BPG 58 - 28M50 blow3 to 565 to 781219 mm
(0.75 inch)
ID Plant Mix PavementPGSuperpave NANANANANA
IL SP HMA Surface CoursePG 58/64 - 22Superpave/M75 blow 3.5 to 4.568 to 7814/1519mm
(0.75 inch)
MI Gap Graded SPPG 70-22PSuperpaveNANANANANA
NY 12.5-mm Superpave HMAPG 64-28 PG 70-22SuperpaveNA3 to 565 to 801412.5 mm
(0.5 inch)
NC S-12.5CPG 70 - 22SuperpaveNA3 to 565 to 751419 mm
(0.75 inch)
OH Item 880 (7-yr warranty)PG 64-22 PG 7022MSuperpave/M75/50/35blow3.5NA1419 mm
(0.75 inch)
PA Superpave HMA Wearing CrPG 64-22 PG 58-22Superpave/M75/50 blow3 to 5NA1512.5 mm
(0.5 inch)
 
Table 78. AC wearing course specification summary (continued).
Pooled Fund StateHMAC Reference% Pass Number 4% Pass Number 200Fracture (%)La WearDegSS Loss (%)Antistrip (%)Field Compaction (%)
AK HMA, Type II, Class B33 to 703 to 780 min54 max30 min9 maxNANA
ID Plant Mix PavementNA2 to 109030 MaxNA12 maxNANA
IL SP HMA Surface Course24 to 652 to 6NA40 maxNA15 max<75 TSR92 to 96
MI Gap Graded SPNANANANANANANANA
NY 12.5-mm Superpave HMANA2 to 1075 to 8535 MaxNA18 max<80 TSR92 to 97
(88 to 98 w/penalty)
NC S-12.5CNA4 to 895/9055 MaxNA15 max<85 TSR
(no F/T)
92 days average
(89 w/penalty)
OH Item 880 (7-yr warranty)38 to 502 to 675/7040 MaxNA15 max<70/80 TSR93 to 97
(90 to 98 w/penalty)
PA Superpave HMA Wearing Cr40 to 80/M3 to 685/8040 maxNANANA92 to 97
(89 to 99 w/penalty)
 
Table 79. AC base course specification summary.
Pooled Fund StateHMAC ReferenceAC GradeMix DesignCompactionVoids (%)VFA (%)Min VMA (%)Max Agg. Size
AK HMA, Type II, Class BPG 58 - 28M50 blow3 to 565 to 781219 mm
(0.75 inch)
ID Plant Mix Leveling CoursePGSuperpaveNANANANANA
IL SP HMA Binder CoursePG 58/64 - 22Superpave/M75 blow3.5 to 4.568 to 7814/1519 mm
(0.75 inch)
MI 4E50PG 64 - 28SuperpaveNANANANANA
NY Binder and Base CoursePG 64-28 PG 70-22SuperpaveNA3 to 565 to 801419 mm
(0.75 inch)
NC B-25.0CPG 64 - 22SuperpaveNA3.0 to 5.065 to 751238 mm
(1.5 inches)
OH Item 880 (7-yr warranty)PG 64-22 PG 64-28Superpave/M75/50/35blow4 to 3.5NA14/1619 mm
(0.75 inch)
PA Superpave HMA Base CrPG 64-22 PG 58-22Superpave/M50 blow3 to 5NA1512.5 mm
(0.5 inch)
 
Table 80. AC base course specification summary (continued).
Pooled Fund StateHMAC Reference% Pass Number 4% Pass Number 200Fracture (%)La WearDegSS Loss (%)AntistripField Compaction (%)
AK HMA, Type II, Class B33 to 703 to 780 min54 max30 min9 maxNANA
ID Plant Mix Leveling CourseNA2 to 109030 MaxNA12 maxNANA
IL SP HMA Binder Course24 to 652 to 6NA40 maxNA15 max75% TSR92 to 96
MI 4E50NA4 to 89550 MaxNANANA92 to 96
NY Binder and Base CourseNA2 to 875 to 8535 MaxNA18 max<80% TSR92 to 97
(88 to 98 w/penalty
NC B-25.0CNA3 to 795/9055 maxNA15 max<85% TSR
(no F/T)
92 days average
(-3 w/penalty)
OH Item 880 (7-yr warranty)38 to 502 to 675/7040 MaxNA15 max<70/80 TSR93 to 97
(90 to 98 w/penalty)
PA Superpave HMA Base Cr40 to 80/M3 to 685/8040 maxNANANA92 to 97
(89 to 99 w/penalty)
 
Table 81. Asphalt-treated permeable base course specification summary.
Pooled Fund StateHMAC ReferenceAC GradeMax Agg. Size% Pass Number 4% Pass Number 200
AK NANANANANA
ID NANANANANA
IL NANANANANA
MI NANANANANA
NY ATPB Type1/2PG 64-28 PG 70-2238 mm
(1.5 inches)
3 TO 152 TO 4
NC NANANANANA
OH NANANANANA
PA NANANANANA
 
Table 82. Unbound base course specification summary.
Pooled Fund StateReferenceMax Agg. Size% Pass number 4% Pass number 200FractureLa WearDegSS Loss
AK Grading D - 125 mm (1inch)35 to 650 to 670%50 max45 min9 max
ID Rock Cap75 mm (3 inches)0 to 5(0 to 5)Quarry40NANA
IL NANANANANANANANA
MI 21AA25 mm (1 inch)35 to 504 to 895%50 maxNANA
NY See Sub-baseNANANANANANANA
NC Aggregate Base Course38 mm (1.5 inches)35 to 554 to 10none55 MaxNA15 max
OH Aggregate Base50 mm (2 inches)30 to 600 to 15NA40 MaxNA15 Max
PA 2A50 mm (2 inches)24 to 500 to 10NA45 MaxNA10 Max
 
Table 83. Subbase course specification summary.
Pooled Fund StateReferenceMax Agg. Size mm (inches)% Pass Number 4% Pass Number200La WearDegLLPISE
AK Grading B50 (2)20 to 550 to 65040256NA
ID Granular Subbase100(4)30 to 750 to 1540NANANA30
IL CAM / BAMNANANANANANANANA
MI Class II SandNANANANANANANANA
NY SubbaseNANANANANANANANA
NC NANANANANANANANANA
OH NANANANANANANANANA
PA NANANANANANANANANA
 
Table 84. Select subgrade specification summary.
Pooled Fund StateReferenceMax Agg. Size mm (inches)% Pass 1"% Pass #4% Pass #200PI
AK SM Type ANANA20 to 55%0 to 66
ID NANANANANANA
IL NANANANANANA
MI Granular Material Type II75 (3)60 to 100NA0 to 7NA
NY NANANANANANA
NC Lime stabilizedNANANANANA
OH NANANANANANA
PA NANANANANANA
 
Table 85. Overview of rural interstate flexible pavement design.
LayerAKIDILMINYNCOHPA
MainlineShoulderMainlineShoulderMainlineShoulderMainlineShoulderMainlineShoulderMainlineShoulderMainlineShoulderMainlineShoulderMainline
HMA Surface CourseNo pavements at 30 M-ESAL6 in.6 in.2.0 in.SP2 in.SP1.5 in.1.5 in.2 in.2 in.4 in. S12.5C4 in. S12.5C4 in. S12.5C3.0 in.
It 880
3.0 in.
It 880
1.5 in.
SP 9.5
0.75 in.
HMA Binder CourseNANA18.25 in. SP6 in. SP2 in.2 in.2 in.2 in.3 in. I19.0C3 in. I19.0CNA8.5 It
880
8.5 It
880
2 in.
SP 19
NA
HMA Base Course1.8 in.1.8 in.NANA3.75 in.3.75 in.3 in.3 in.9 in. B25.0C5.5 in. B25.0CNANANA13 in.
SP 25
NA
ATPBNANANANANANA4 in.4 in.NANANANANANANA
Total HMA7.8 in.7.8 in.20.25 in.8 in.7.25 in.7.25 in.11 in.11 in.16.0 in.12.5 in.4.0 in.11.5 in.11.5 in.16.5 in.4.75 in.
UT Base Course12 in. Rock Cap12 in. Rock CapNA12.25 in. to C6 in. 21AA6 in. 21AANANA10 in. ABC10 in.ABCVariable6.0 in.
It 304
6.0 in.
It 304
NANA
UT Subbase Course12 in.12 in.NANA18 in. sand18 in. sand12 in.12 in.NANANANANA10 in. 
Total UTBC24 in.24 in.NANA24 in.24 in.12 in.12 in.10 in.10 in.Variable6 in.6 in.100
Lime Treated SubgradeNANA12 in.NANANANANANA8 in.NANANANANA
Other Subgrade TreatmentSeparation GeotextileNANANANANANANANANANA 36 in. (note) 36 in. (note)NANA
Total Roadway Depth31.8 in.31.8 in.32.25 in.32.25 in.31.25 in.31.25 in.23 in.23 in.26.0 in.30.5 in.Variable54.5 in.54.5 in.26.5 in.4.75 in.
UnderdrainsyesNAyes4 in.yes6 in.Yes or Daylight ATPBNANANANAyesNAyesNA
Note:Grading specifications require replacement of A-4b silt within 0.9 m (3 ft) of SG.
Measurements in inches (in.) (1 inch = 25.4 mm)
 
Table 86. Overview of rural interstate rigid pavement design.
LayerAKIDILMINYNCOHPA
MainlineShoulderMainlineShoulderMainlineShoulderMainlineShoulderMainlineShoulderMainlineShoulderMainlineShoulderMainline Shoulder
PCCP DepthNo Pavements at 30 M ESAL12 in.NA10.5 in.6 in.11.5 in.9 in.10 in.10 in.111111.5 in.11.5 in.13 in.NA
Treated Base Course2 in. ATPLC2 in. ATPLC4 in.NANANA4 in. ATPB4 in. ATPB3 in. B25.0BNANANA4 in. ATPB4 in. ATPB
UT Base Course12 in.
Rock Cap
12 in. Rock CapNA8.5 in.6 in. 4GMod8.5 in. 4GModNANA1.5 in. S9.5B4.5 in. ABC6 in.6 in.NANA
UT Subbase CourseNANANANA10 in.
IIA Sand
10 in.
IIA Sand
12 in.12 in.NANANANA4 in.4 in.
Total BC14 in.14 in.4 in.8.5 in.16 in.18.5 in.16 in.16 in.4.5 in.4.5 in.6 in.6 in.8 in.8 in.
Lime Treated SubgradeNANA12 in.12 in.NANANANA8 in.8 in.NANANANA
Other Subgrade TreatmentNANANANAGeotech fab.4G/sandNANANANANA36 in. (note)36 in. (note)NANA
Total Roadway Depth26 in.26 in.26.5 in.26.5 in.27.5 in.27.5 in.26 in.26 in.23.5 in.23.5 in.53.5 in.53.5 in.21 in.21 in.
UnderdrainsyesNAyes4 in.yes6 in.yesNANANAyesNAyesNA
Other Subgrade Treatment Separation Geotextile NANANANANANANANANANANANANA
Note:Grading specifications require replacement of A-4b silt within 0.9 m (3 ft) of SG.
Measurements in inches (in.) (1 inch = 25.4 mm)
 
Table 87. Overview of principal flexible pavement design.
LayerAKIDILMINYNCOHPA
MainlineShoulderMainlineShoulderMainlineShoulderMainlineShoulderMainlineShoulderMainlineMainline AltShoulderMainlineShoulderMainlineShoulder
HMA Surface Course2 in.2 in.4.8 in.4.8'2 in.
SP SC
2 in.
SP SC
1.5 in.1.5 in.2 in.2 in.3 in. S12.5C3 in. S12.5C3 in. S12.5C3 in.3 in.3.5 in.0.75
HMA Binder Course3 in.3 in.1.8 in.1.8 in.12 in.
SP BC
6 in
SP BC
2.0 in.2.0 in.2 in.2 in.3 in. I19.0C4 in. I19.0CNANANA5 in.4 in.
HMA Base CourseNANANANANANA3.0 in.3.0 in.2 in.2 in.4.5 in. B25.0CNANA5 in.5 in.9 in.NA
ATPBNANANANANANANANA4 in.4 in.NANANANANANANA
Total HMA5 in.5 in.6.6 in.6.6 in.14 in.8 in.6.5 in.6.5 in.10 in.10 in.10.57 in.3.0 in.8 in.8 in.17.5 in.4.75 in.
UT Base Course7 in.7 in.12 in. RC12 in. RCNA6 in.6 in. 4Gmod6 in. 4GmodNANA10 in. ABC10 in. ACBVariable6 in.6 in.  
UT Subbase Course12 in.12 in.NANANANA18 in. IIA Sand18 in. IIA Sand12 in.12 in.NANANANANANANA
Total UBC19 in.19 in.12'12'06 in.24 in.24 in.12 in.12 in.10 in.10 in.Variable6 in.6 in.00
Lime Treated SubgradeNANANANA12 in.12 in.NANANANANA8 in.NANANANANA
Other Subgrade Treatment36 in. Select36 in. SelectNANANANANANANANANANANA36 in. (note)36 in. (note)NANA
Total Roadway Depth60 in.60 in.18.6 in.18.6 in.26 in.26 in.30.5 in.30.5 in.22 in.22 in.20.5 in.25 in.Variable50 in.50 in.17.5 in.4.75 in.
UnderdrainNANAnoNAnoNAyes 6 in. u-drain yes or daylight ATPBNANANANAyesNAif required byNA
Note:Grading specifications require replacement of A-4b silt within 0.9 m (3 ft) of SG.
Measurements in inches (in.) (1 inch = 25.4 mm)
 
Table 88. Overview of principal rigid pavement design.
LayerAKIDILMINYNCOHPA
MainlineShoulderMainlineShoulderMainlineShoulderMainlineShoulderMainlineShoulderMainlineShoulderMainlineShoulderMainlineShoulder
PCCP DepthNo PCC Pavement10.510.59.75 in.2 in.
SP SC
8.54 in. HMA9 in.9 in.8 in.8 in.8 in.8 in.8 in.8 in.
T Base Course2 in. ATPLC2 in. ATPLC4 in. CAM/ BAM6 in.
SP BC
NANA4 in. ATPB4 in. ATPB3 in. B25.0B/ 1.5 in. S9.5B3 in. B25.0B/ 1.5 in. S9.5BNANANANA
UT Base Course12 in. Rock Cap12 in. Rock CapNA5.75 Type C6 in. 4Gmod6 in. 4GmodNANANANA6 in.6 in.4 in. OGS4 in. OGS
UT Subbase CourseNANANANA10 in.10 in.12 in.12 in.NANANANA4 in.4 in.
Total BC14 in.14 in.4 in.5.75 in.16 in.16 in.16 in.16 in.4.5 in.4.5 in.6 in.6 in.8 in.8 in.
Lime Treated SubgradeNANA12 in.12 in.NANANANA8 in.8 in.NANANANA
Other Subgrade TreatmentNANANANAGeotech fab. 4G/sandNANANANANA36 in. (note)36 in. (note)NANA
Total Roadway Depth24.5 in.24.5 in.25.75 in.25.75 in.26.5 in.20 in.26 in.26 in.20.5 in.20.5 in.50 in.50 in.16 in.16 in.
UnderdrainsnoNAnoNAyes6 in.yesyesNANAyesyesif required byNA
Note:Grading specifications require replacement of A-4b silt within 0.9 m (3 ft) of SG.
Measurements in inches (in.) (1 inch = 25.4 mm)

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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). 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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