What is Regen?

Regen GGBS (ground granulated blast-furnace slag) is a readily available, reliable cement substitute, manufactured from a by-product of the iron-making industry. Using one tonne of Regen in concrete reduces the embodied CO2 by around 900kg, compared to using one tonne of Portland Cement, and also increases its durability. Regen is more sustainable than other cement substitutes such as Fly Ash.

In the UK, GGBS is usually supplied as a separate component for concrete and is added at the concrete mixer. It can replace 70 per cent or more of the Portland cement. In British Standards GGBS is referred to as an ‘addition’ and counts fully towards the cement content in concrete. Regen conforms to BS EN 15167-1 “Ground Granulated Blast furnace Slag for use in concrete, mortar and grout” and is available throughout the UK, accompanied by a full technical and logistical support package. Read more


Regen is ideal for use in projects where sustainability and durability are essential requirements. Example applications include:

  • Soil stabilisation
  • Mortar
  • Precast concrete
  • Paving and street furniture
  • Specialist projects


Regen is a highly sustainable cement substitute. From its low emissions production process to its use in long-life structures, concrete made using Regen provides many sustainability benefits.


  • Low embodied CO2
  • Produces low CO2 concrete
  • No mineral extraction
  • Reduced landfill
  • Meets your criteria for sustainable construction


    • Produces more durable concrete

    • Concrete made with Regen will last longer in aggressive environments


    • Lighter-coloured concrete – near-white
    • Aesthetically pleasing
    • Safer in dark areas


    • Available nationwide


    • Full package of technical support available


    • Using Regen is a cost-effective method of making more sustainable and durable concrete


    Regen provides a superior, lighter-coloured finish than concrete made using Portland cement-only mixes.

    In particular, Regen enables:

    • A lighter-coloured concrete
    • Greater reflectivity, providing better visibility and therefore safety in dark environments
    • Reduced efflorescence

    Because of the near-white colour, Regen can be used as a replacement for White cement, with only a minimal difference in whiteness. However, for architectural applications where brightness is a critical factor, it is still recommended to use White cement wherever practical.

    Logistics and support


    Regen can be ordered by calling the Heidelberg Materials Cement Order Hotline on

    Our experienced team will be able to provide all the information you require for taking delivery of Regen. Alternatively, please specify Regen to your preferred concrete producer.

    NBS Plus

    Regen is also listed on the NBS Plus system, where you can easily download the technical product information into your project specification.

    CPD presentations

    Heidelberg Materials Cement is able to provide your practice with a full Continual Professional Development (CPD) presentation on the specification and use of Regen, as well as other cement substitutes in sustainable construction. To request more information or to book a CPD presentation, please make use of the

    Mix designs

    To help you design and specify the best mix, we have a team of Technical Development Managers who have experience in working on major projects. Please contact our Customer Services Team on

    * The service charge element for calls to this number is 5 pence per minute plus your phone company's access ​charge, which vary dependent on your provider

    Enabling sustainable construction with Regen GGBS

    Enabling sustainable construction with Regen GGBS

    Two people with skateboards in a concrete skate park, one is doing a jump, sea in the background


    Through ground-breaking innovation, we’re pioneering carbon capture and storage – and transforming our industry. By introducing the world’s first carbon captured net-zero cement, we’re giving forward-thinking construction partners the opportunity to build a better tomorrow.

    Learn more

    We offer a variety of webinars covering sustainability and innovative products. They are all free to join and last one hour, so sign-up for any that are of interest.



    Using Regen as a cement substitute in concrete increases its durability and resistance to deleterious reactions.

    Read more


    Regen is a highly sustainable cement substitute. From its low-emissions production process to its use in long-life structures, concrete made using Regen provides many sustainability benefits.

    Learn more

    Reference - 20 Fenchurch Street

    This building was designed to achieve a BREEAM ‘excellent’ environment performance rating. The use of EcoPlus concrete played a big part in helping achieve this through the correct selection of its constituent parts.

    Read the case study

    Reference - Second Severn Crossing

    Hanson supplied 60,000m3 of Regen GGBS for this cable stayed bridge that proivides a crossing point for the M4 motoway over the Severn Estuary.

    Read the case study