Report2_Pavement.pdf

Page 1 of 2 Pages

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

Page 1 of 2 M:\PROJECTS\natr\3o19_p24\Techserv\Pavement\Correspondence\NP-NATR 3O19, 3P24 Pavement Memo.doc

SUBJECT: Pavement Recommendations for NP-NATR 3O19, 3P24

TO MESSAGE/COMMENT FROM/DATE

R.

Satasiya

PS&E

Project Manager

And:

C.

Burnell Highway Design Manager

To support developing 30% PS&E for the project, we’re submitting our findings and pavement recommendations for the project NP-NATR 3O19, 3P24. The project site is located along the Natchez Trace Parkway in Madison County, MS. The project consists of preservation for 8.31 miles of the Mainline Parkway from RIP Milepost 111.29 to

102.98 (Mainline Mile Marker 110.1 to 101.7). The project includes adjacent ramps and parking. Please note that upon completion of further analyses, the pavement recommendations are subject to change.

PROJECT ROUTES

• Mainline Parkway (NPS Route 0001C)

• U.S. 51 Access Road (NPS Route 131)

• Craft Center Parking (NPS Route 927)

• Old Canton / Airport Access Road A (NPS Route 132A)

• SR 123 Airport Access Road B (NPS Route 0132B)

• Brashears Access Road and Parking (NPS Route 191 & 928),

• Reservoir Overlook / Lakeview Access Road and Parking (NPS Routes 192 & 929)

• Boyd Mounds Access Road and Parking (NPS Routes 193 & 930)

• West Florida Boundary Access Road and Parking (Routes 194 & 931)

The first 7 miles of the project section from RIP MP 111.29 to 104.3 is in mostly good condition with primarily low severity and some moderate severity longitudinal cracking and block cracking. There is a 100ft area of settlement located near MP 110. The last 1.3 miles of the project from RIP MP 104.3 to 102.98 shows an increased level of distress.

There is moderate longitudinal and transverse (block) cracking with some high severity longitudinal and fatigue cracking in spots. From RIP MP 103.3 to 103.05 there is an existing wedge and level.

Access roads and parking areas range from fair to poor condition. Some access roads have sections of high severity longitudinal and fatigue cracking along with rutting and distortion. These distresses are indicative of subsurface structural issues. The long term repair in these locations would require reconstruction, however this is likely cost prohibitive and beyond the scope of this project. Therefore, a wedge and level course is being recommended in lieu of spot repairs for these pavement sections. Performing a wedge and level would serve as a temporary improvement, however expectations of a wedge and level should include the understanding that this will not address the underlying subgrade issues resulting in the distresses. Therefore it should be expected that distresses may reflect back through at these spot locations.

We are recommending an asphalt concrete (AC) overlay according to the minimum requirements laid out below in Table 1. Taper milling will be required in parking areas and ramps within 6 feet of curbs and gutters in order to maintain reveal and ensure proper drainage. In addition, approximately 1200 tons of Wedge and Level should be included as required and approved by the CO. There is an area near RIP MP 105.1 of about 220ft that was identified during scoping as requiring widening because it is being used as a

A.

Maloche Pavement Engineer

Through:

S. O’Brien Pavement Team Leader

11/07/2017

Page 2 of 2 Pages

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

Page 2 of 2 M:\PROJECTS\natr\3o19_p24\Techserv\Pavement\Correspondence\NP-NATR 3O19, 3P24 Pavement Memo.doc

TO MESSAGE/COMMENT FROM/DATE

turnaround, which has led to edge drop-off. Areas in need of widening should be saw cut and constructed according to the minimum requirements laid out in Table 2.

Table 1. Mainline Parkway Pavement Recommendations

Layer Minimum Thickness

(in)

Comments

AC Surface Course 1 3/8

Asphalt Concrete Pavement, Gyratory Method (GACP), 0.3 to < 3 x 106

Equivalent Single Axle Loads (ESAL), 3/8” Nominal Maximum Size Aggregate

(NMSA), Type IA smoothness

Asphalt Tack Coat --- AC Tack Coat as per section 412 of the

FP-14 Specifications

Wedge and Level Course (as needed) Varies

GACP, 0.3 to < 3 x 106 ESAL’s, 3/8”

NMSA

Table 2. Widening Recommendation

Layer Minimum Thickness

(in)

Comments

AC Surface Course 1 3/8 GACP, 0.3 to < 3 x 106 ESAL’s, 3/8”

NMSA, Type IA smoothness

Asphalt Tack Coat --- AC Tack Coat as per Section 412 of the

FP-14 Specifications

AC Base Course 3 ACP Type 2, 0.3 to < 3 x 106 ESAL’s, ¾” NMSA as per Section 403 of FP-14

Asphalt Tack Coat --- AC Tack Coat as per Section 412 of the

FP-14 Specifications

AC Base Course 3 ACP Type 2, 0.3 to < 3 x 106 ESAL’s, ¾” NMSA as per Section 403 of FP-14

Aggregate Base Course 6

Base Aggregate, Grading C or D, as per Subsection 703.05(b) of the FP-14

Specifications

Geotextile --- Separation and Stabilization Geotextile, Class 2, Type E, as per Section 714 of FP- 14 Specifications cc: Highway Design (I. Imam), TS Reading w/ attachments

NATR 3O19, 3P24

Mainline Photos:

Photo 1: Route 0001C Beginning at RIP MP 111.29

Photo 2: Route 0001C at RIP MP 110.3 shows low to moderate longitudinal cracking

Photo 3: Route 0001C at RIP MP 109.8 Shows good condition

Photo 4: Route 0001C at RIP MP 108 shows mostly low severity cracking

Photo 5: Route 0001C at RIP MP 105.1 shows area park has requested widening to avoid edge drop‐off caused by motorists

Photo 6: Route 0001C at RIP MP 103.1 shows high severity longitudinal cracking

Photos of Adjacent Routes:

Photo 7: Parking 0927 shows Low to Moderate Cracking in some spots

Photo 8: Route 0131 shows Low to Moderate block cracking

Photo 9: Route 0132A swell/upheaval area Photo 10: Route 0132B shows high severity block cracking / fatigue

Photo 11: Route 0191 Low severity block cracking throughout. Photo shows isolated area of distortion from tree roots.

Photo 12: Route 0192 Shows low to moderate block cracking

Photo 13: Route 0929 Shows low severity cracking. Milling is required around curb to meet curb reveal.

Photo 14: Route 0193 shows swell/upheaval

Photo 15: Route 0193 shows swell/upheaval

Photo 16: Route 0930 shows low severity cracking

Photo 17: Route 0194 shows longitudinal cracking and distortion

Photo 18: Route 0931 Shows low severity cracking