Category: 2023

POSTER 23-21: USE OF GROUND PENETRATING RADAR TO DETECT CEMENT CONTENT IN CEMENT-STABILIZED SUBGRADE

USE OF GROUND PENETRATING RADAR TO DETECT CEMENT CONTENT IN CEMENT-STABILIZED SUBGRADE

PI: S. Sonny Kim

Co-PI(s): Bjorn Birgisson

Institution(s): University of Georgia

Abstract

Cement stabilization has been successfully used to improve poor-quality subgrade soils by increasing the soil support to remedy these soils useful for pavement construction. Cement stabilization has the potential to reduce initial construction costs through improved subgrade stability in the pavement structure. Cement stabilization also provides greater long-term stability of the pavement structure and lower pavement life-cycle costs through reduced pavement maintenance. Unfortunately, flexible pavements over cement-stabilized subgrade are experiencing reflective cracking originating from the shrinkage cracks on top of cement-stabilized subgrade due to poor construction. In this study, ground-penetrating radar (GPR) was used to capture the inconsistent layer thickness of cement-stabilized subgrade and its cement content. The results show that GPR is capable of capturing different dielectric constants along with different percent cement contents in subgrade soils.

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POSTER 23-20: INVESTIGATION OF HEAVIER-THAN-EXPECTED VEHICLE WEIGHTS AT NON-INTERSTATE WIM SITE IN GEORGIA

INVESTIGATION OF HEAVIER-THAN-EXPECTED VEHICLE WEIGHTS AT NON-INTERSTATE WIM SITE IN GEORGIA

PI: Sung-Hee Sonny Kim

Co-PI(s): Mi Geum Chorzepa

Institution(s): University of Georgia

Abstract

With increased container capacity at the Port of Savannah, it is critically important to build reliable transportation infrastructure and provide superior road connections to interstates. The main goals of this project are to conduct field investigations of pavement and bridge structures in the vicinity of the Savannah Port area, including routes connecting the Garden city and Ocean terminals with interstates, evaluate their reliability using the latest Weigh-In-Motion (WIM) data, and identify maintenance needs and future design requirements that may be affected by traffic changes, including vehicle counts, classification, and weight changes derived as a result of the Savannah Port Deepening project and terminal expansions. Additionally, safety and potential distress evaluation and monitoring of pavement and bridge structures is a crucial task for responsible transportation agencies. The Federal Government allows up to 100,000 lbs for containerized freight trucks traveling to and from ports with certain restrictions. The Georgia General Assembly has allowed increases to single and tandem axle weights as well as overall gross vehicle weights on trucks operating off of the interstate. These increases are more than 25% of the federally allowed weights. The impact of these heavier vehicles and the repeated load cycles on Georgia?s bridges and roads need to be investigated.

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