Details:

Creators:
Sargand, Shad ; Khoury, Issam ; Jordan, Ben ; Scheer, Matthew ; Cichocki, Paul
Sargand, Shad ; Khoury, Issam ; Jordan, Ben ; Scheer, Matthew ; Cichocki, Paul Less -
Corporate Creators:
Ohio Research Institute for Transportation and the Environment
Corporate Contributors:
United States. Federal Highway Administration
Subject/TRT Terms:
[+]
Accelerated Tests Optimization Pavement Distress Pavement Performance Perpetual Pavements Service Life Strain (Mechanics) Thickness Traffic Loads
Publication/ Report Number:
FHWA/OH-2015/17
Resource Type:
Tech Report
Geographical Coverage:
Ohio
Corporate Publisher:
Ohio. Dept. of Transportation. Office of Statewide Planning and Research
Abstract:
This report documents the performance of perpetual pavement structures constructed by the Ohio Department of Transportation.

Three perpetual pavement test sections on U.S. Route 23 in Delaware, Ohio (DEL-23) were constructed with AC thicknesses 11 in (28 cm),

13 in (33 cm), 15 in (38 cm) and instrumented to detect strains in Fatigue Resistant Layer (FRL) and base layers, deflections, temperatures,

and subgrade pressures. Strains at bottom of FRL during Controlled Vehicle Load (CVL) testing in summer indicated the 13 in (33 cm)

section on stabilized subgrade and 15 in (38 cm) section on compacted subgrade met perpetual criteria, while 11 in (28 cm) section on

stabilized subgrade did not. Computer simulation of DEL-23 sections with PerRoad confirmed these findings, but also indicated the 11 in

(28 cm) section would meet perpetual pavement criteria.

Test pavements were built in the Accelerated Pavement Load Facility (APLF) and instrumented similarly to DEL-23. The sections

were thinner, but included Highly Modified Asphalt (HiMA) with Kraton polymer binder in sections of depth 8 in (20 cm), 9 in (23 cm), 10

in (25 cm), and 11 in (28 cm), the last using conventional asphalt in the base as a control with HiMA in upper layers. There was no FRL.

The 10 in (25 cm) and 11 in (28 cm) sections met perpetual criteria even when heated through to 100F (37.8C). After enduring 10,000

passes of 9000 lb (40 kN) load at 5 mph (8 km/h), the surface rutting was measured with a profilometer and was considerably below even

the ODOT threshold for “low rutting” (0.125 in or 0.32 cm). An extrapolation of the curve fit suggested the HiMA surface would remain

under the low rutting threshold much longer than conventional or WMA surfaces. Note these sections were built under ideal conditions, so

field experience may differ.

Fatigue endurance limit was computed using parameters measured in the laboratory asphalt mixture performance tester from samples

collected from DEL-23 and APLF. Endurance limits computed following the NCHRP Project 9-44A method and MEPDG guide (E0=E*)

provided a good fit with field results.

Ten high-performing existing AC pavements from a previous forensic study (Sargand and Edwards, 2010) were further evaluated as

potential perpetual pavements. Follow-up field investigations at each site included distress surveys, falling weight deflectometer (FWD)

measurements, dynamic cone penetrometer (DCP) data, and Portable Seismic Property Analyzer (PSPA) measurements. Strains at the

bottom of the asphalt were back calculated from FWD deflections using the elastic modulus program Evercalc. AC cores were collected

and tested for indirect tensile strength and resilient modulus. The pavements were modeled using finite element software Abaqus, which

confirmed the Evercalc strain computations. Of the ten pavements, seven appeared to meet conservative perpetual pavement strain criteria,

one could be upgraded to meet perpetual pavement criteria by adding an additional asphalt layer, and two clearly did not meet perpetual

pavement standards. A brief report on the status of previous perpetual pavement designs built in Stark County (STA-77) and Wayne

County (WAY-30) is given.


Format:
PDF
Funding:
State Job No. 465970
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:b940280393036b82a2f6f2940607672f14aaff72593e9df202f08552c2ea25dd
Download URL:
https://rosap.ntl.bts.gov/view/dot/29355/dot_29355_DS1.pdf
File Type:

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