Limestone calcined clay cement LC3
Limestone calcined clay cement - also referred to as LC3 - is a form of cement that is being developed through a manufacturing process that is reduces CO2 emissions.
The production of LC3 requires limestone (15%) and low grade calcined clays (30%) to form a type of supplementary cementitious material or SCM. LC3 also requires gypsum (5%) and clinker (50%). While there is still clinker in LC3, the amount is significantly less than in Portland cement (up to 95%).
Clinker is not considered environmentally friendly, since it is produced at high temperatures. Producing SCM for LC3 requires less energy and so contributes to the CO2 reduction properties of LC3.
The development of LC3 began in 2004 with the exploration of calcined clays as a sustainable SCM replacement for clinker. Additional research has taken place with the support of various funding agencies to develop technical viability.
In 2020, additional funding was granted by the Swiss Agency for Development and Cooperation (SDC). With this support, experimental production of LC3 has begun in different parts of the world. Plans are underway to expand the scale of the project globally.
[edit] Related articles on Designing Buildings Wiki
- Clinker in construction.
- Concrete.
- Limestone for building.
- Portland cement.
- Urban mining to reinvent concrete.
[edit] External resources
Featured articles and news
Homes England creates largest housing-led site in the North
Successful, 34 hectare land acquisition with the residential allocation now completed.
Scottish apprenticeship training proposals
General support although better accountability and transparency is sought.
The history of building regulations
A story of belated action in response to crisis.
Moisture, fire safety and emerging trends in living walls
How wet is your wall?
Current policy explained and newly published consultation by the UK and Welsh Governments.
British architecture 1919–39. Book review.
Conservation of listed prefabs in Moseley.
Energy industry calls for urgent reform.
Heritage staff wellbeing at work survey.
A five minute introduction.
50th Golden anniversary ECA Edmundson apprentice award
Showcasing the very best electrotechnical and engineering services for half a century.
Welsh government consults on HRBs and reg changes
Seeking feedback on a new regulatory regime and a broad range of issues.
CIOB Client Guide (2nd edition) March 2025
Free download covering statutory dutyholder roles under the Building Safety Act and much more.
Minister quizzed, as responsibility transfers to MHCLG and BSR publishes new building control guidance.
UK environmental regulations reform 2025
Amid wider new approaches to ensure regulators and regulation support growth.
BSRIA Statutory Compliance Inspection Checklist
BG80/2025 now significantly updated to include requirements related to important changes in legislation.