Lead Road Pavement Materials Engineer

This role offers an opportunity to contribute to the development of resilient, climate-adaptive, and cost-efficient road infrastructure. The position involves advanced pavement engineering, material optimization, and collaboration with multidisciplinary teams within a leading international organization.

This position operates within a dynamic infrastructure project environment, leading the engineering design and evaluation of pavement materials for road and highway projects across the Horn of Africa. The role is critical for ensuring durable, cost-effective, and climate-resilient pavement structures, with a strong focus on material performance, testing, and compliance with standards.

Reporting to the Senior Project Manager-Infrastructure, the Pavement Engineer will lead the investigation, design, and specification of pavement systems, including subgrade, subbase, base, and surfacing layers, ensuring that designs are technically sound, cost-effective, and compliant with UNOPS and international standards.

The contractor will be engaged on a retainer basis and will be required to provide services as and when needed.

1. Pavement Investigation, Site Assessment, and Material Evaluation

• Assess project sites

• Lead geotechnical and pavement-related site investigations, including field surveys and interpretation of laboratory test results.

• Assess subgrade conditions, including strength (CBR, modulus), moisture content, and variability.

• Evaluate material sources (quarries, borrow pits) for suitability, quality, and availability.

• Review existing pavement conditions (for rehabilitation projects) and identify failure mechanisms.

• Define key design input parameters based on traffic, soil, and environmental conditions.

2.Road Cross-Section/Pavement Design

• Lead the design of full pavement cross-sections, including subgrade, subbase, base, and surfacing layers.

• Determine layer thicknesses and structural composition based on:

  • Traffic loading (ESALs, axle loads)

  • Subgrade strength and material properties

  • Design life and performance requirements

  • Environmental and climatic conditions

• Develop pavement design calculations, models, and assumptions.

• Prepare pavement cross-section drawings and typical details.

Apply recognized design standards and methodologies (ERA, AASHTO, mechanistic-empirical approaches, and national standards).
3. Pavement Material Selection, Mix Design, and Specifications

• Select suitable materials for each pavement layer considering:

  • Climate conditions (temperature, rainfall, UV exposure)

  • Traffic loading and durability requirements

  • Local material availability and constructability
    
    

• Develop detailed technical specifications for:

  • Subgrade improvement and stabilization

  • subbase and base materials

  • Asphalt and concrete materials
    
    

• Define material requirements including grading, strength, durability, and moisture resistance.

• Lead and review asphalt and concrete mix designs, ensuring compliance with performance requirements.

• Optimize material combinations for durability, cost-effectiveness, and environmental suitability.

• Ensure compliance with international (ASTM, AASHTO, BS) and national standards.

4. Traffic, Climate, and Pavement Performance Analysis

• Analyze traffic data to determine design traffic (ESALs), axle loads, and growth projections.

• Incorporate climate and environmental conditions into pavement design, including:

  • Design pavement structures to resist: Rutting, Fatigue cracking, Thermal cracking, Moisture-related damage

  • Ensure integration of drainage considerations into pavement design to enhance performance and durability.

5. Construction Support, Quality Assurance, and Control (QA/QC)

• Review and approve material submittals, laboratory test results, and mix designs.

• Provide technical support during pavement construction activities, including:

  • Subgrade preparation

  • Placement and compaction of subbase and base layers

  • Asphalt paving and finishing

• Conduct site inspections and ensure compliance with approved designs and specifications.

• Monitor quality control processes and testing requirements.

• Support resolution of technical and material-related issues during construction.

• Contribute to QA/QC documentation and preparation of as-built records.

6. Design Documentation and Reporting

• Prepare and review:

  • Pavement design reports

  • Material specifications

  • Mix design reports

  • Technical drawings and details

  • Bill of Quantities (BoQ)

• Ensure clear documentation of assumptions, methodologies, and design inputs.

• Respond to technical comments and revise design outputs accordingly.

• Maintain proper records and archiving of all design and material data.

7. Coordination and Stakeholder Engagement

• Coordinate with multidisciplinary design teams.

• Ensure integration of pavement design with overall road infrastructure (alignment, drainage, structures).

• Liaise with contractors, consultants, and material suppliers.

• Support procurement processes through technical inputs, evaluations, and clarifications.

8. Knowledge Management and Capacity Building

• Contribute to development and updating of pavement design guidelines and material specifications.

• Share technical knowledge, best practices, and lessons learned.

• Provide technical guidance and mentoring to junior engineers and technical staff.

• Maintain up-to-date knowledge of pavement engineering technologies and standards.