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.

With a worldwide production of 1.4 billion tonnes a year, the manufacture of CEM I Portland cement is regarded as a high-emissions industry. The use of cement replacements provides opportunities for significant reductions in energy use and CO2 emissions.

The most effective alternative to Portland cement is Hanson Regen, which typically replaces 50 per cent of the Portland cement in a concrete mix. Greater proportions of up to 95 per cent can be used, with advantages in special applications.

There are environmental benefits to be gained from the use of Regen as a cement substitute in both the production process and throughout the life of the structure. In its production process, Regen:

  • Generates very low CO2 emissions, as it is a by-product of iron-making
  • Produces very low emissions of the harmful gasses SO2 and NOx
  • Requires virtually no quarrying or mineral extraction

The increased durability of concrete manufactured using Regen further reduces a project’s environmental impact by:

  • Reducing the amount of repair and maintenance required
  • Extending the service-life of concrete structures

A comparison of the environmental impacts of Regen and Portland cement is given in the table below.

Comparison of environmental benefits of Regen and Portland cement (PC)
Environmental issue Measured as Impact
One tonne of GGBS1 One tonne of PC
Climate change CO2 equivalent 0.07 tonnes 0.95 tonnes
Energy use Primary energy2 1,300 MJ 5,000 MJ
Mineral extraction Weight quarried 0 1.5 tonnes
Waste disposal Weight to tip 1 tonne saved3 0.02 tonnes
1. No account has been taken of the impacts of iron-making because the slag is created regardless of whether or not it can be used.
2. Includes energy involved in the generation and distribution of electricity.
3. The use of slag for the manufacture of GGBS saves it from potential disposal.
Source: Higgins D D, Sustainable concrete: How can additions contribute? Institute of Concrete Technology Annual Technical Symposium, 2006
Enabling sustainable construction with Regen GGBS

Enabling sustainable construction with Regen GGBS


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.


Hanson Cement contact details:

Sales and customer service:

Place an order:

Logistics and support


Regen can be ordered by calling the Hanson Cement Order Hotline on 0330 123 4520

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 

Hanson 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 online enquiry form

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 0330 123 4525 *

* 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.