Cement

 
 

Cement is a complex material with many uses. For example, as a hydraulic binder it can act as very sophisticated glue. Lafarge researchers are working to develop cements suited to diverse customer needs while reducing the impact of these products on the environment.

 

Cement

Formidable strength

After hardening, cement maintains its strength and stability, even underwater. Cement is usually used in a powder form. It is mixed with water and aggregates (sand and gravel) to make concrete.

 

 

 
 
 
 
 
 
 

 

 

Mortar

Mortar is a mixture of cement, sand (an inert  component which provides body) and water, which may be complemented with additives, supplements and colored pigments. Unlike concrete, mortar does not include aggregates. It may be prepared on site or delivered from a mixing plant. Mortars are used for bonding (to join cut or molded elements), for cladding (waterproofing and dressing of walls and coverings, finishing of floors), and for a number of other purposes including jointing, rendering, insulating, sealing and plugging.

 

 

 

Research orientations

Cement R&D works to develop cements with differentiating qualities and characteristics and high added value for customers.

This strategy responds to 3 industrial imperatives:

  • improving the consistency and qualities of cement, for example the setting time and strength during the first hours following the pour,
  • increasing the use of cement additives (slag, fly ash, pozzolan) in the context of an industrial-environmental approach to save nonrenewable resources and limit CO2 emissions,
  • identifying and implementing different approaches to reducing CO2, particularly during industrial processes.

 

CO2 and cement

Why does cement production emit CO2?

Cement production naturally results in CO2 emissions:

  • 60% of emissions are due to the physical-chemical transformation of raw materials at high temperatures (decarbonation of limestone),
  • 40% are caused during the heating of the cement furnace to 1,500°C.