The Federal Highway Administration's (FHWA) form Fhwa 1641 is a document that assesses the environmental impacts of transportation projects. The form is used to ensure that potential environmental impacts are identified and considered during the project development process. In order to complete the form, various studies must be conducted, including an Environmental Assessment (EA) and a Transportation NEPA Impact Statement (TNI). The FHWA has recently released updated guidance for completing the form, which includes new information on climate change and greenhouse gas emissions. The guidance also provides clarification on how to properly account for indirect and cumulative effects.
| Question | Answer |
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| Form Name | Form Fhwa 1641 |
| Form Length | 5 pages |
| Fillable? | No |
| Fillable fields | 0 |
| Avg. time to fill out | 1 min 15 sec |
| Other names | 1641_v14 superpave bituminous concrete mix form |
U.S. Department of Transportation
Federal Highway Administration
Federal Lands Highway
WORKSHEET FOR SUPERPAVE ASPHALT CONCRETE MIX DESIGN
AASHTO R 35
Project: |
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Contractor: |
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Nominal Maximum Aggregate Size, : |
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Asphalt supplier: |
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Grade of asphalt: |
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Sources for: |
Aggregates: |
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Mineral filler: |
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Testing laboratory name: |
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Phone: |
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Testing performed by: |
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Testing reported by: |
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English |
Metric |
SUMMARY OF THE PROPOSED |
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1.Number of gyrations (Nint,/ Ndes,/ Nmax)
2.Percent binder by mass of total mix (Pb)1
3.Percent binder by mass of aggregate
4.Air voids (Va) at Ndes
5.Voids in mineral aggregate (VMA) at Ndes
6.Voids filled with asphalt (VFA) at Ndes
7.Maximum unit mass (Gmm)
8.Effective specific gravity of aggregate (Gse)
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10.Specific gravity of binder (Gb)
11.Recommended plant mixing temperature, (Attach Temperature Viscosity Curve)
12.Percent compaction at Nmax
13.Hveem stabilometer value (If specified)
14.Moisture Susceptibility:
a.Dry strength,
b.Wet strength,
c.Index of Retained Strength, %
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GRADATION TARGET VALUES AND |
SPECIFIC GRAVITY AND ABSORPTION |
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ALLOWABLE DEVIATIONS |
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Job Mix |
Allowable |
Fine |
Coarse |
Combined |
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Sieve Sizes |
Formula |
Deviation3 |
Aggregate |
Aggregate |
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Aggregate |
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Target Value2 |
% |
(AASHTO T 84) |
(AASHTO T 85) |
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Bulk SG (Gsb )
Bulk SSD SG
Apparent SG (Gsb)
Absorption |
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1Establish asphalt cement content (percent by mass of mix) to the nearest 0.01 percent.
2 Establish target values to the nearest 0.1 percent as a part of the job mix formula. 3 Allowable deviations plus or minus from established target values.
Form FHWA 1641 (Rev |
Page 1 of 5 |
WORKSHEET FOR A SUPERPAVE MIX DESIGN (Continued)
Material |
Stockpile Description |
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Blend Ratio |
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Stockpile |
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A |
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% |
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B |
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% |
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C |
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% |
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D |
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% |
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E |
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% |
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TOTAL |
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% |
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Stockpile Gradation |
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Sieve
Size
Stockpile
A
%
Stockpile
B
%
Stockpile
C
%
Stockpile
D
%
Stockpile
E
%
Blended
Stockpile
Gradation
Job Mix
Formula
Target Values
Specification
Limits
Aggregate Properties
Property |
Result |
Specification |
LA Abrasion, % - Grading
AASHTO T 96
Sodium Sulfate Soundness, %
AASHTO T 104
Durability index (Coarse)
AASHTO T 210
Durability index (Fine)
AASHTO T 210
Fractured Faces, % -
ASTM D 5821
Property |
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Result |
Specification |
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Fine aggregate angularity, |
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AASHTO T 304 - method A |
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Flat and elongated particles, |
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ASTM D 4791 - 1: |
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ratio |
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Sand Equivalent |
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AASHTO T 176, Alt method #2, reference method
Other:
Other:
Form FHWA 1641 (Rev |
Page 2 of 5 |
WORKSHEET FOR A SUPERPAVE MIX DESIGN (Continued)
TRIAL NUMBER |
1 |
AVG |
2 |
AVG |
3 |
AVG |
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% Asphalt by mass of total mix (Pb) |
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Specimen height, |
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Effective Binder Content (Pbe) |
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Bulk specific gravity at Ndes (Gmb) |
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% compaction at Nint |
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% Air voids at Ndes (VA) |
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Max. unit mass Gmm |
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Voids in mineral aggregate (VMA) at Ndes |
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Voids filled with asphalt (VFA) at Ndes |
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Hveem Stabilometer value |
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TRIAL NUMBER |
4 |
AVG |
5 |
AVG |
6 |
AVG |
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% Asphalt by mass of total mix (Pb) |
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Specimen height, |
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Effective Binder Content (Pbe) |
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Bulk specific gravity at Ndes (Gmb) |
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% compaction at Nint |
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% Air voids at Ndes (VA) |
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Max. unit mass Gmm |
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Voids in mineral aggregate (VMA) at Ndes |
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Voids filled with asphalt (VFA) at Ndes |
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Hveem Stabilometer value |
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Test Results for Each of the Individual Moisture Susceptibility Test Specimens |
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Percent asphalt binder: |
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AASHTO T 283 |
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Specimen Dia: |
6 inch |
4 inch |
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Antistrip, type, amount: |
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Freeze cycle: |
Yes |
No |
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Sample I.D. |
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Average |
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Height |
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Dry |
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Wet |
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Bulk Specific |
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Dry |
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Gravity |
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Wet |
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Air |
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Dry |
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Voids |
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Wet |
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Dry |
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Strength |
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Wet |
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Retained Strength, % |
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Form FHWA 1641 |
Page 3 of 5 |
WORKSHEET FOR A SUPERPAVE MIX DESIGN (Continued)
Design Curves for Proposed Job Mix Formula (JMF)
AIR VOIDS (Va) |
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UNIT MASS |
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% Air voids (Va )
% Asphalt binder (Pb)
% Asphalt binder (Pb)
VFA |
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VMA |
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Voids filled with asphalt |
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Voids in mineral aggregate |
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% Asphalt binder (Pb) |
% Asphalt binder (Pb) |
Form FHWA 1641 (Rev |
Page 4 of 5 |
U.S. Department of Transportation
Federal Highway Administration
Federal Lands Highway
RECLAIMED ASPHALT PAVEMENT (RAP) DATA SHEET
Location: |
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Sampled by: |
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Tested by: |
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Date: _____________________ |
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RAP 1 |
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RAP 2 |
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% of RAP in Mixture |
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Dry |
T 308 |
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Dry |
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T 308 |
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Sieve Size |
Burned |
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Gradation |
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Gradation |
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Burned |
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Gradation |
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Gradation |
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AC by % mix, Pb
Specific Gravity |
Specific Gravity |
Gmm
Gse
Gse = (100 – Pb)/(10/Gmm – Pb/Gb)
Gsb
Gsb = Gse/(((Pba*Gse)/(100*Gb)) + 1)
Pba = (assumed)
Gb = (assumed)
Remarks:
Form FHWA 1641 (Rev |
Page 5 of 5 |