WHRP G23-02 — Frost Susceptibility Field Testing FWD Deflection & GPR Subsurface Profiling Campaign — Multi-Year Instrumentation Across Wisconsin

Test Sites

756

Photos

FWD Stations

GPR Profiles

Interactive Test Site Map 16 Sites

Instrumentation sites across Wisconsin. Click markers for details. Blue = 2024 campaign, orange = 2026 planned.

2024 Campaign (8 sites) 2026 Planned (8 counties)

Field Campaign Sites 2 Campaigns

8 sites tested in July 2024, 8 additional counties planned for spring 2026 thaw monitoring.

FWD Deflection Analysis — Station 7 16 Test Points

Falling Weight Deflectometer data — deflection basin, subgrade modulus, and structural index calculations at ~9,000 lbf load level.

Maximum Surface Deflection (D0)

Back-Calculated Subgrade Modulus

Surface Curvature Index (SCI)

Temperature Profile During Testing

Deflection Basin — Sensor response at 0″ to 72″ offsets

Basin Area — Structural capacity indicator

Subgrade Modulus — Foundation stiffness

Max Deflection — Peak response profile

SCI — Upper layer condition

Temperature — Air vs pavement surface

GPR Radar Profiles Subsurface

Ground Penetrating Radar scans revealing pavement layer interfaces, voids, and subsurface anomalies.

Profile 413 — Raw radar scan RAW

Profile 414 — Raw radar scan RAW

Profile 414 (Processed) — Enhanced with pavement layer identification PROCESSED

Field Photo Gallery 20 Photos

Selected photographs from the July 2024 instrumentation campaign — sensor installation, pavement coring, trenching, and data logger deployment.

Research Timeline 2023–2027

2023

Project Initiation

WHRP G23-02 launched to study frost susceptibility of Wisconsin pavements. Literature review, site selection, and methodology development.

July 2024

First Field Campaign

FWD deflection testing, GPR subsurface profiling, and sensor instrumentation at 8 sites: Manotowish, Woodruff, Fifield, Chetek, Arcadia, Pittsville, Theresa, and Tipler. 756 field photos documented.

2024 – 2025

Data Analysis & Platform Development

FWD structural index calculations, GPR layer identification, resilient modulus modeling. Development of WiSWR real-time monitoring and SWR decision platform.

Spring 2026 (Planned)

Second Field Campaign

Expanded FWD/GPR testing in 8 counties: Barron, Dodge, Florence, Iron, Oneida, Price, Trempealeau, and Wood. Spring thaw monitoring with real-time RWIS data correlation.

2026 – 2027

Final Analysis & Reporting

Multi-year data integration, frost susceptibility guidelines development, and final WHRP report publication.