Senior Material Specialist, Tunnel Practice

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AECOM is seeking a Senior Material and Durability Specialist to join our Tunnel Practice in Mississauga, Canada. This candidate will lead durability design and materials engineering for civil infrastructure from design through construction and commissioning. This is a new position.

Responsibilities

Develop and validate durability criteria, service-life models, and exposure classifications, select materials and protective systems (concrete/shotcrete mix designs, SCMs, steel protection, grout, waterproofing, sealants, coatings) aligned with CSA (e.g., A23.1/A23.2, S6) and relevant ACI/ASTM/EN standards, and review submittals, supplier qualifications, mix trials, and mock‑ups.; Plan and interpret laboratory and field testing (e.g., RCPT/bulk resistivity, chloride diffusion, carbonation, ASR mitigation, sulphate resistance, freeze–thaw, petrography, pull‑off adhesion, permeability/leakage, rebar corrosion/half‑cell) and translate results into clear recommendations, acceptance decisions, and corrective actions.; Provide construction-phase support by responding to RFIs and site clarifications, troubleshooting material nonconformances, optimizing curing and placement practices, and verifying conformity through ITPs, batch plant oversight, production monitoring, and as‑built traceability.; Contribute to risk and change management by documenting durability assumptions, tracking deviations, advising on lifecycle/maintenance implications, and preparing concise technical reports for clients and contractors.

Requirements

BS + 6 years of relevant experience or demonstrated equivalency of experience and/or education.

Nice to have

Master’s degree in civil engineering with minimum 6 years of demonstrated experience across Canada and overseas to lead durability design and materials engineering for civil infrastructure from design through construction and commissioning highly preferred.; Strong communication, coordination, and digital documentation skills are essential, along with fluency in Canadian codes and international practices gained on overseas assignments.; Experience bridging design intent to site execution, coaching field teams, and working flexibly in plant, lab, and active construction environments is highly valued.