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Concrete Technologist

United Kingdom, London 50000.00 - 60000.00 GBP / Year · Job Posted January 13, 2026
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Job Description

At Cocoon, we’re developing low-carbon construction materials for the builders of tomorrow. Steel and cement account for nearly 15% of global CO₂ emissions, and decarbonising these industries requires completely new approaches to mix design, testing, and implementation. We’re now building our in-house concrete capability so we can qualify SCMs, validate performance against industry standards, and support deployment of our technology at pilot and demo-scale. To do this, we’re establishing a fully equipped concrete laboratory in London — and we’re looking for a Concrete Technologist to help make it happen. This role is hands-on, varied, and central to Cocoon’s ability to qualify SCMs, validate performance, and scale towards real-world deployment.

Job Responsibility

  • Develop concrete mix formulations across the experimental matrix (SCM replacement, admixtures, w/b ratios) to ASTM C1709 and BSI Flex 350
  • Plan batching schedules, specimen numbers, test timelines, and weekly execution plans
  • Optimise mix proportions and troubleshoot workability, flash setting, segregation, and strength issues
  • Operate the mixer and conduct fresh property tests (slump, density, air content, bleeding)
  • Record batch data (temperature, timings, slump, w/b) and maintain full QA/traceability
  • Cast cubes and cylinders
  • manage curing tanks, curing regimes, and specimen conditioning
  • Perform compressive and flexural strength testing at 7, 28, and long-term ages
  • Prepare and run durability tests (RCPT, bulk resistivity, water absorption, sorptivity, permeability, drying shrinkage, sulfate resistance, carbonation depth)
  • Write SOPs for all concrete lab processes and commission existing equipment
  • Identify, procure, and install the missing equipment required for the testing regime
  • Conduct baselining exercises for cement and industry incumbents
  • Maintain calibration, servicing, and safe operation of all equipment
  • Manage consumables (PPE, mould oil, aggregates, cement) and keep the lab organised and compliant
  • Ensure all risk assessments are in place and adhered to
  • Maintain digital logs, record raw data, and align outputs with current data storage methods
  • Process and analyse test results
  • prepare technical reports and summaries, and present data for internal reviews, meetings, and partner updates
  • Advise on SCM qualification routes and recommend workflow improvements
  • Train team members in SOPs, mixing, fresh testing, and equipment use
  • Coordinate outsourcing for tests not done in-house and manage samples, logistics, and external data integration
  • Support small-scale field trials and demonstration pours, including onsite testing

Requirements

  • Hands-on experience in concrete testing, materials laboratories, or construction materials research
  • Confident working to ASTM, BS EN, and other standards
  • Enjoy practical, repetitive experimental work and take pride in process discipline
  • Communicate clearly and maintain rigorous documentation
  • Thrive in a fast-moving environment with changing priorities
  • Proactive, organised, and comfortable owning a lab space

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