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Concrete Mix Design

CONCRETE MIX DESIGN​

PACT designs concrete mixes that perform on site, not just on paper. Using the BRE mix design method (BR 331), our concrete technologists design, batch and test trial mixes in our UKAS-accredited laboratory, then refine them until they meet your strength, workability, durability and carbon targets.

Our mix design expertise includes:

  • Conventional Concrete Mixes – structural, pavement quality and general-purpose concrete to BS EN 206 / BS 8500
  • Site Specific Mixes – tailored to local aggregates, batching method (including volumetric) and site conditions
  • Compliance Checks of your existing mix designs and optimisation

Innovation & Sustainability

Construction is evolving, and so are the materials that support it. At PACT we continually develop new mixes and adopt innovative techniques, digital reporting and sustainable practices that improve performance while reducing environmental impact.

Our focus on innovation drives:

  • New mixes for a sustainable future with a reduced carbon footprint
  • Rapid set concrete for short closures of essential services
  • Embodied carbon comparison of mix options, including GGBS and blended cements
  • More efficient trials and testing turnaround
  • Enhanced durability assessments for long-term resilience
  • Sustainable recommendations based on proven material behaviour
Our Sustainability

FROM SPECIFICATION TO APPROVED MIX

  1. Brief – Specification, exposure class, strength and workability targets, materials and batching method.
  2. Design – Initial mix proportions calculated to BR 331, with embodied carbon estimate if required.
  3. Trial – Laboratory trial mixes batched and tested for fresh and hardened properties.
  4. Refine – Adjustments to meet every target, with strength-development curves for the final mix.
  5. Submit – A full mix design report for engineer or client approval, with optional site trial support.

Why PACT

  • Technologist-led – Designed by professionals.
  • Lab-proven – Every mix testing is performed by our UKAS-accredited laboratory.
  • Specialist mixes – Rapid set, high early strength and geopolymer experience few labs offer.
  • Site-ready – Mixes designed for real batching plants, volumetric trucks and airside possessions.
Our Sustainability

Safety & Compliance

Working across live construction sites — from highways and industrial units to airside environments — demands strict adherence to safety regulations, operational procedures and controlled access protocols. PACT’s teams are fully trained and experienced in carrying out trials and testing safely in every setting, with minimal disruption and full regulatory compliance.

Every mix we design is tested under UKAS-accredited, documented procedures, giving engineers, clients and approving bodies confidence that the mix will meet its specification on site.

Safety & Compliance