HMA_Mix_Design_Submittal.docx
DOCX document 44 KB Posted
- Solicitation number
- ITB-TR0-6544
- Issued by
- King County, Spokane City, Washington
About this file
This is an HMA Mix Design Submittal form for the City of Seattle, Washington, used to document hot-mix asphalt (HMA) design specifications for roadway construction projects. The form requires contractors to submit comprehensive technical data including project identification, asphalt binder information from primary and secondary suppliers, aggregate structure details with gradation specifications, and aggregate test results such as specific gravity, sand equivalency, and coarse aggregate fracture properties. Contractors must provide HMA volumetric mix design data developed in accordance with WSDOT Standard Operating Procedure (SOP) 732, including air void (Va), voids in mineral aggregate (VMA), voids filled with asphalt (VFA), and bulk specific gravity (Gmb) values measured at multiple gyration levels (Nini, Ndes, and Nmax). The submittal requires documentation of design ESALs, gyration levels, mixing and compaction temperature ranges, and anti-strip type information. The form includes tables for reporting stockpile gradations to the nearest tenth of a percent and combined gradations to the nearest whole percent, with a 0.45 power chart required to show the combined gradation with control points.
The HMA Mix Design Proposal section requires contractors to identify the design that achieves or approaches a 4.0% Va target (7% for ATB mixes) and must meet specification requirements including 96.0% Gmm at Ndes for standard mixes, 98.0% maximum Gmm at Nmax, a dust-to-asphalt ratio between 0.6 and 1.6, and a maximum of 20% RAP in the final mix. The contractor certifies compliance with WSDOT SOP 732 and acknowledges that the City of Seattle SPU Materials Laboratory will provide a response within 25 working days after receiving a complete mix design submittal. This form is integral to the City's roadway construction materials bidding process, which includes asphalt materials procurement under Scope 1 of the broader roadway construction materials, debris disposal, and hauling services contract opportunity.
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Text version
HMA Mix Design Submittal
Contract Information
| PW Number: |
| Project Name: |
| Date: |
| Project Manager: |
| Supervising Resident Engineer: |
| General Contractor: |
| HMA Paving Contractor: |
| Contractors Mix ID: | ||
| HMA Class: | ||
| |_| 3/8 Inch | |_| 3/4 Inch | |_| ATB |
| |_| 1/2 Inch | |_| 1 Inch | |_| Other (describe) |
| Design ESALs (millions): | ||
| Gyration Levels: | ||
| Nini = | Ndes = | Nmax = |
Asphalt Binder Information
| Primary Asphalt Binder Supplier: |
| Asphalt Binder Specific Gravity (Gb): |
| Asphalt Binder Grade: |
| Max. Binder Temp.: |
| Mixing Temp. Range: |
| Compaction Temp. Range: |
| Anti-strip Type: |
| Secondary Asphalt Binder Supplier: |
| Asphalt Binder Specific Gravity (Gb): |
| Asphalt Binder Grade: |
| Max. Binder Temp.: |
| Mixing Temp Range: |
| Compaction Temp. Range: |
| Anti-strip Type: |
Note: Attach asphalt binder Temperature – Viscosity curves to submittal forms.
Aggregate Structure
In the table below, provide the “Material” identification (3/4”-0, RAP, etc.), “Source” (J-199, E-320, etc.), “Ratio” (45%, 20%, etc.), and the percent passing each sieve for each stockpile used in the mix design as well as the combined gradation and the specification requirements for the class of HMA used. Report all stockpile gradations to the nearest tenth of a percent. Report the combined gradation to the nearest whole percent except the U.S. No. 200, which must be reported to the nearest tenth of a percent. Attach a 0.45 power chart showing the combined gradation with control points for the class of mix submitted.
Material
| Combined Gradation |
| Specification Requirements |
Source
Ratio
1-1/2” Square
1” Square
3/4” Square
1/2" Square
3/8” Square
U.S. No. 4
U.S. No. 8
U.S. No. 16
U.S. No. 30
U.S. No. 50
U.S. No. 100
U.S. No. 200
Aggregate Test Data
In the tables below provide all of the aggregate specific gravity and aggregate quality property test data determined for each stockpile and the selected design aggregate structure (Combined Gradation) as required. The specification requirements only apply to the design aggregate structure (Combined Gradation).
Aggregate Specific Gravity, Sand Equivalency, and Uncompacted Void Content of Fine Aggregate
Material
| Combined Gradation |
| Specification Requirements |
Source
Ratio
Gsb Coarse
Gsb Fine
Gsb Blend
Sand Equiv.
45 min.
Uncompacted Void Content
45% Min.
Coarse Aggregate Fracture (not applicable to ATB)
| Sieve Sizes | |
| |_| 1 Sided Fracture | |_| 2 Sided Fracture |
| Combined Gradation | |
| %Fractured Faces | |
| Specification Requirements |
1” Square
90% Min.
3/4” Square
90% Min.
1/2" Square
90% Min.
3/8” Square
90% Min.
U.S. No. 4
90% Min.
Flat and Elongated Particles (not applicable to ATB)
| Sieve Sizes |
| Ratio is 5:1. |
| % Flat and Elongated |
| Specification Requirements |
1” Square
10% Max.
3/4” Square
10% Max.
1/2" Square
10% Max.
3/8” Square
10% Max.
U.S. No. 4
10% Max.
Binder Content of RAP (%):
Remarks:
HMA Mix Design Data
In the Table below, provide the HMA volumetric mix design data determined by performing WSDOT SOP 732. The Va, VMA, VFA, and Gmb values must be determined from replicate mixtures compactd to the appropriate N design gyration level in accordance to Section 8.2 of SOP 732, back calculated values from replicate mixtures compacted to Nmax are not acceptable.
| HMA Properties |
| Primary Asphalt Binder |
| Secondary Asphalt Binder |
| -0.5% Pb Design |
| Pb Design |
| +0.5% Pb Design |
| -0.5% Pb Design |
| Pb Design |
| +0.5% Pb Design |
Pb
% Gmm @ Nini
% Gmm @ Ndes (Va)
%VMA @ Ndes
%VFA @ Ndes
Dust / Asphalt Ratio
Pbe
Gmm
Gmb
Gse
Height @ Nini
Height @ Ndes
HMA Mix Design Proposal(s)
In the Table below, provide the HMA volumetric mix design data that comes closest to, or intersects 4.0% Va (7% for ATB), from the testing performed via WSDOT SOP 732. This may be the same as the Pb design data from the table above. Also provide the % Gmm data developed from the replicate mixture compacted to the appropriate Nmax gyration level.
| HMA Properties |
| Primary Asphalt Binder Proposal |
| Secondary Asphalt Binder Proposal |
| Specification Requirements |
Pb
% Gmm @ Nini
% Gmm @ Ndes (Va)
96.0 (93 for ATB)
%VMA @ Ndes
%VFA @ Ndes
% Va @ Ndes
Dust / Asphalt Ratio
0.6 – 1.6
Pbe
Gmm
Gmb
Gse
% Gmm @ Nmax
98.0 Max (ATB excluded)
% RAP in Final Mix
20 Max.
I certify this HMA job-mix formula (JMF) has been developed in accordance to WSDOT Standard Operating Procedure (SOP) 732 “Volumetric Design for Hot-Mix Asphalt (HMA)”. The HMA JMF has been verified in accordance to section 10 of SOP 732 which consists of preparing replicate mixtures containing the selected design aggregate structure at each of the following binder contents: (1) the estimated design binder content, Pb (design); (2) 0.5 percent below Pb (design); 0.5 percent above Pb (design). I am aware, in accordance to City of Seattle Standard Specification 5-04.3(6)C1, that a response will be provided within 25 Working Days after a complete mix design submittal has been received at the SPU Materials Laboratory in Seattle.
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