Open-end Geotechnical Services: Pennsylvania Turnpike Commission

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Overview: GeoStructures has served numerous open-end geotechnical service contracts for the Pennsylvania Turnpike Commission. Three notable services involve finite element method (FEM) analysis, lime stabilization, and air void analysis of hardened concrete.

In one contract, GeoStructures utilizes finite element method (FEM) analysis to model distressed pavement joints between concrete slabs, and to investigate the effects of mesh reinforcement on rehabilitation. Specifically studied are the contribution factors of pavement joint deterioration due to loss of support, aggregate interlock and dowel bars, as well as the effectiveness of steel mesh reinforcement in retarding reflective cracking through an asphalt overlay.

In another contract, GeoStructures implements a pilot program to evaluate all aspects of lime and cement stabilization construction, such as hydration, mixing, mellowing, stabilization depth and uniformity, and compaction including roller specifications. Forensic studies compare the effects of frost heave for stabilized and non-stabilized soils.

In a third contract, GeoStructures performs air void analysis in accordance with PennDOT PTM 623, “Method of Test for Air Content of Hardened Concrete” and ASTM C457, “Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete” (modified point count method). Calculated parameters include total air void content, specific surface, spacing factor, void frequency, paste-air ratio, and the relative percentages of cement paste, aggregate, and air voids.

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Percolation and Permeability In-Situ Testing 

Drilling Services and Subsurface Investigations

Foundation Investigation and Design

Highway and Bridge Geotechniques

Support of Excavation and Underpinning

Soil-Structure Interaction Analysis and Modeling

Soil Dynamics & Site-Specific Response Spectra

Vibration Monitoring and Analyses

Forensic Evaluations

Slope and Retaining Wall Evaluation and Design

Lime and Cement Stabilization

Mine Subsidence Analysis and Remediation

Sinkhole Evaluation and Remediation

Soil Improvement Techniques

Dam Analysis and Rehabilitation

Environmental Services

Landfills, Ponds, and Lagoons

Pavement Design and Rehabilitation

Construction Inspection and Materials Testing

Geotechnical Laboratory Testing

Concrete and Cement Testing

Petrographic Analysis

Instrumentation and Special Testing

Asphalt Testing

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3-D Dynamic Finite Element Analysis



Institutional & Educational


Industrial, Pharmaceutical, & Gene Therapy

Landfill Expansion Design


Research & Forensics


Water & Wastewater

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