Senior Material Specialist, Tunnel Practice

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. Minimum Requirements: BS + 6 years of relevant experience or demonstrated equivalency of experience and/or education. Preferred qualifications: 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. At AECOM, we are committed to maintaining a secure and trustworthy recruitment process and take any fraudulent hiring activity seriously. To support this commitment, all newly hired employees are required to attend an in-person Day 1 onboarding at an AECOM office location as a condition of employment. About AECOM AECOM is proud to offer comprehensive benefits to meet the diverse needs of our employees. Depending on your employment status, AECOM benefits may include medical, dental, vision, life, AD&D, disability benefits, paid time off, leaves of absences, voluntary benefits, perks, flexible work options, well-being resources, employee assistance program, business travel insurance, service recognition awards, retirement savings plan, and employee stock purchase plan. AECOM is the global infrastructure leader, committed to delivering a better world. As a trusted professional services firm powered by deep technical abilities, we solve our clients’ complex challenges in water, environment, energy, transportation and buildings. Our teams partner with public- and private-sector clients to create innovative, sustainable and resilient solutions throughout the project lifecycle – from advisory, planning, design and engineering to program and construction management. AECOM is a Fortune 500 firm that had revenue of $16.1 billion in fiscal year 2025. Learn more at . What makes AECOM a great place to work You will be part of a global team that champions your growth and career ambitions. Work on groundbreaking projects - both in your local community and on a global scale - that are transforming our industry and shaping the future. With cutting-edge technology and a network of experts, you’ll have the resources to make a real impact. Our award-winning training and development programs are designed to expand your technical expertise and leadership skills, helping you build the career you’ve always envisioned. Here, you’ll find a welcoming workplace built on respect, collaboration and community - where you have the freedom to grow in a world of opportunity. As an Equal Opportunity Employer, we believe in your potential and are here to help you achieve it. All your information will be kept confidential according to EEO guidelines. Artificial intelligence will be used to support the screening, assessment, and selection of applicants for this role. Final hiring decisions are made by the hiring team. Work with Us. Change the World. At AECOM, we're delivering a better world. Whether improving your commute, keeping the lights on, providing access to clean water, or transforming skylines, our work helps people and communities thrive. We are the world's trusted infrastructure consulting firm, partnering with clients to solve the world’s most complex challenges and build legacies for future generations. There has never been a better time to be at AECOM. With accelerating infrastructure investment worldwide, our services are in great demand. We invite you to bring your bold ideas and big dreams and become part of a global team of over 50,000 planners, designers, engineers, scientists, digital innovators, program and construction managers and other professionals delivering projects that create a positive and tangible impact around the world. We're one global team driven by our common purpose to deliver a better world. Join us.