GeoFLEX-PAS: Advanced Design for Flexible Pavements Considering Environmental and Geotechnical Effects

GeoFLEX-PAS is an advanced engineering software application that automates the design and analysis of flexible pavements, with explicit consideration of environmental effects on pavement performance. It delivers a robust, multi-faceted methodology by integrating the established AASHTO 1993 empirical guide with modern Mechanistic-Empirical (M-E) principles.

Key Environmental Factors Addressed

• Temperature-induced modulus variation – based on asphalt mix design and thermal conditions within asphalt layers

• Environmental effects on subgrade – including moisture and seasonal fluctuations

• Subsurface drainage – moisture infiltration and drainage impacts on unbound materials

• Long-term aging and oxidation of asphalt binders

• Climate-adjusted material properties – for seasonal performance modeling

The software is continuously refined using the latest research, state DOT recommendations, and agency best practices—including climate-specific design inputs. This enables engineers to develop optimized, reliable, and cost-effective asphalt pavement designs that reflect real-world environmental conditions while remaining aligned with current industry standards.

Comprehensive Pavement Engineering Support

We are pleased to announce that the latest version of GeoFLEX-PAS offers full pavement-related support for:

Geotechnical Analysis

• Subgrade characterization

• Soil classification analysis for subgrade (AASHTO & USCS methods)

• Modulus determination

• Subsurface drainage evaluation

• Stabilization methods for subgrade and base

• Soil stabilization

• Frost action mitigation in subgrade, subbase, and base layers

• Material suitability analysis

• Base and subbase mix designs

• PG binder selection

• And much more

Asphalt Mix Designs

• Asphalt mix design approaches

• Mix selection for asphalt layers

• Marshall Method

• SuperPave (volumetric and gyratory compaction)

• PBMD (Performance-Based Mix Design)