Pavement Memo.pdf

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Form FHWA-201 (Rev. 11-67)

U.S. DEPARTMENT OF TRANSPORTATION

FEDERAL HIGHWAY ADMINISTRATION

Use this form in lieu of transmittal slips within Dept. of Trans. When message comment is to be retained as file material. Do not prepare carbons. Not to be used in lieu of Form FHWA-121 for informal correspondence. MINUTE-MEMO

SUBJECT: Pavement Recommendations for NP-ANTI 300(2), 307(1), etc

TO MESSAGE/COMMENT FROM/DATE

R.

Kotadia Project Manager

And:

S. Nawaz Highway Design Manager

To support developing PS&E for the project, we’re submitting our findings and pavement recommendations for project NP-ANTI 300(2), 307(1), etc. The project is located in Antietam National Battlefield in Washington County, Maryland. The project includes pavement resurfacing of thirty-two (32) roads and parking areas; reconstruction of the Burnside Bridge Accessible Pathway to meet the Americans with Disabilities Act (ADA) standards; and widening of the Burnside Bridge Accessible Pathway parking. A Project Location Map is included in Appendix A.

Eastern Federal Lands Highway Division (EFLHD), Road Inventory Program (RIP) team collected data for Cycle 6 (C6) for these sites in 2018. A field view was performed by EFLHD Pavement Engineers in May 2019 to determine the existing pavement condition.

Pavement cores were obtained from selected locations in September 2020 to determine the existing pavement type and thickness.

BACKGROUND

The roads and parking areas included in this project are asphalt concrete pavement (ACP) structures totaling approximately 14.3 lane miles. Based on the C6 RIP data (2018), these roadways/parking areas have Pavement Condition Ratings (PCR) ranging from 87 to 100 indicating good to excellent pavement conditions. Based on the field view performed in May 2019, the pavements were confirmed to be in good to excellent conditions exhibiting localized low severity transverse and longitudinal cracking, minor edge cracking and minor surface defects including polished aggregates and raveling. Potholes were observed in the parking lots. A summary of RIP data for C6 for these roadways/parking areas is included in Appendix B.

D. R. Miller Farmstead Parking (NPS Route 0916) has a PCR of 53 indicating poor pavement conditions. Based on the field view performed in May 2019, the pavement was confirmed to be in poor conditions exhibiting high severity transverse cracking, high severity fatigue cracking, deteriorated potholes and raveling. The existing asphalt concrete pavement (ACP) section at the pavement coring location consisted of 3.5-inch ACP showing some deterioration.

The Burnside Bridge Accessible Pathway is currently a gravel surface pathway. Based on the observations during the coring operation, the structure consists of plastic pavers with solid plastic circular cells (1-inch deep) filled with crushed stones and placed over a geofabric and approximately 7-inch coarse gravel base.

The Burnside Bridge Accessible Pathway is accessible through a parking area off of Old Burnside Bridge Road. The existing pavement section at the pavement coring location consisted of 5.25-inch ACP.

The Pavement Coring Log is included in Appendix C.

PRELIMINARY PAVEMENT RECOMMENDATIONS

Based on the pavement conditions observed during the field view and the pavement cores, we recommend the following pavement rehabilitation strategies. The recommendations

M. Guercio Pavement Engineer

Through:

M.

Elias Pavement Team Leader

07/20/2022

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Use this form in lieu of transmittal slips within Dept. of Trans. When message comment included here reference the FP-14, “Standard Specifications for Construction of Roads and Bridges on Federal Highway Projects”.

Most of the roadways within this project are eligible for resurfacing using a 1.5-inch ACP overlay with the minimum requirements presented in Table 1.

Table 1. Pavement Resurfacing

Layer Minimum Thickness

(in)

Comments

AC Surface Course 1.5

Gyratory Asphalt Concrete Pavement (GACP), 3/8” Nominal Maximum Size Aggregate (NMSA), <0.3 x 106 ESAL, Type IV roughness, as per Section 401

Tack Coat --- AC Tack Coat as per Section 412

We also recommend performing Crack Cleaning and Sealing for cracks ½-inch and wider at least a week prior to placing the resurfacing treatment. Crack sealing should be performed in accordance with Section 414.

It is recommended to have as much time as possible, typically 6 to 12 months or one season per industry practice, between the crack sealing operation and a hot surface treatment application. That time will allow for the crack sealant to set into the cracks and cure under vehicular traffic. This will also prevent too much sealant under the surface treatment resulting in better performance.

If this project will receive surface treatments soon after the crack sealing application, it is recommended to use a recessed configuration, as per the standard details provided in previous projects, by applying the sealant so that it sets below the surface. This reduces the risk of the sealant melting and potentially bubbling back through the subsequent hot surface treatment applications.

For D.R. Miller Farmstead Parking, the NPS prefers patching the distressed areas (within 200 ft from the intersecting roadway) and overlaying the existing ACP (Table 2). The remaining section of roadway will be converted into a gravel road (Table 3).

Table 2. D. R. Miller Farmstead Parking (NPS Route 0916) – ACP Patching and Overlay

Thickness

GACP, 3/8-inch NMSA, < 0.3 x 106 ESAL, Type IV roughness as per Section 401 Tack Coat --- AC Tack Coat as per Section 412 ACP Patch

Type 2 2.0 GACP, 3/8-inch NMSA, <0.3 x 106 ESAL as per Section 401

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Use this form in lieu of transmittal slips within Dept. of Trans. When message comment

Table 3. D. R. Miller Farmstead Parking (NPS Route 0916) – Gravel Road

Thickness

Aggregate Surface 6.0 Aggregate Surface Course, as per Section 301 Existing

Aggregate Base --- Aggregate Base Reconditioning as per Section 303

The Burnside Bridge Accessible Pathway parking will be widened as part of this project.

Table 4 summarizes the minimum requirements for the ACP widening.

Table 4. Burnside Bridge Accessible Pathway Parking Widening

Thickness

GACP, 3/8-inch NMSA, < 0.3 x 106 ESAL, Type IV roughness as per Section 401 Tack Coat --- AC Tack Coat as per Section 412

AC Base Course 4.0 GACP, 3/4-inch NMSA, < 0.3 x 106 ESAL, as per Section 401

Aggregate Base Course 6.0 Aggregate Base, Grading C or D, as per Section 301

Geotextile --- Separation and Stabilization Geotextile Class 2 – Type E, as per Section 207

The Burnside Bridge Accessible Pathway is a 10-ft wide trail that will be reconstructed as part of this project. The existing plastic pavers and gravel base will be removed. The new structure will consist of an exposed aggregate concrete surface on an ACP base. Table 5 summarizes the minimum requirements the reconstructed pathway.

Table 5. Burnside Bridge Accessible Pathway

Thickness

Exposed Aggregate

Concrete Surface 6.0

Minor Concrete Pavement, Exposed Aggregate Finish, as per Section 501

AC Base Course 2.0 GACP, 3/8-inch NMSA, < 0.3 x 106 ESAL as per Section 401

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Use this form in lieu of transmittal slips within Dept. of Trans. When message comment

We recommend limiting joint spacing (slab length) to 15 ft. to minimize cracking potential. Dowel bars are not required due to the low-volume traffic expected on the trail which consists mostly of pickup trucks and occasionally tree removal trucks. Longitudinal and transverse reinforcement should consist of #4 bars placed at 12-inch and 36-inch spacing, respectively.

APPENDICES

Appendix A: Project Location Map Appendix B: RIP Road Condition Summary Report for Cycle 6 Appendix C: Pavement Coring Log cc: Construction Branch, TS Reading w/ attachments

APPENDIX A

Project Location Map

ANTI 300(1), 307(1), etc. APPENDIX A Location Map

ANTI 300(1), 307(1), etc. APPENDIX A Location Map

APPENDIX B

RIP Road Condition Summary Report for Cycle 6

APPENDIX C

Pavement Coring Log

APPENDIX A Project: NP ANTI 300(2) 307(1)

Report Date: 10/05/2020

Notes:

1. Photographed cores show top of core on left-hand side, unless otherwise noted.

Core No. Core Photograph / Side View Location Key

PV20-01

9/29/20

Core Description Location / GPS 3.5” Asphalt Concrete Specimen shows deterioration below 2.0”.

Gray coarse crushed stone base (3”).

Location: D.R. Miller Farmstead Parking

GPS: 39.484035°; -77.749283°

Core No.

Core Photograph / Side View Location Key

PV20-03

9/29/20

Core Description Location / GPS 5.25” Asphalt Concrete Specimen intact Gray coarse crushed stone base (3”).

Location: Burnside Bridge Accessible Pathway Parking

GPS: 39.451516°; -77.733071°

APPENDIX A Project: NP ANTI 300(2) 307(1)

Report Date: 10/05/2020

Notes:

1. Photographed cores show top of core on left-hand side, unless otherwise noted.

Core No. Core Photograph / Side View Location Key

PV20-02

9/29/20

Core Description Location / GPS 2” (width) by 1” (depth) Cellular Confinement System (CCS) – Plan View CCS filled with crushed stones and placed over geofabric and approximately 7” coarse gravel base.

Location: Pedestrian Trail

GPS: 39.451228°, -77.732806°

Core No.

Core Photograph / Side View Location Key

PV20-02

9/29/20

Core Description Location / GPS 2” (width) by 1” (depth) Cellular Confinement System (CCS) – Side View Location: Pedestrian Trail

GPS: 39.451228°, -77.732806°