Lafarge and Bouygues Constructuion unveil a new generation of concretes

Lafarge and Bouygues Constructuion unveil a new generation of concretes
Published: 20 October 2009

Once again, Lafarge is innovating in concrete and has announced the launching of a new range of insulating ready-mix concretes: ThermediaTM. The Group has brought its scientific expertise and associated its know-how with that of Bouygues Construction to develop and test this first new product in France: Thermedia 0.6 B. This concrete, intended for building envelope applications, represents an initial response to the demand for improved energy efficiency in buildings. Indeed, it introduces a new performance feature to concrete in construction systems conforming with the guidelines of the French Grenelle Environment Forum. 

Thermedia 0.6 B is the product of four years of research in Lafarge’s laboratories and, thanks to the partnership with Bouygues Construction, it has been possible to quickly deploy Thermedia 0.6 B in several social housing sites where the behavior of the material in the structure was observed and analysed and its efficiency ensured. 

Thermedia 0.6 B is made for the French market and meets an environmental and financial requirement. This concrete actively improves construction systems that integrate interior thermal insulation (ITI) by contributing to heat loss reductions through the building’s envelope. This now affects 90 per cent of apartment blocks built in France.  

Thermedia 0.6 B is a genuine scientific and technological feat. It is the only structural ready-mix concrete today capable of combining strength and lightness, mechanical performances and thermal properties. Thermedia 0.6 B’s specific mix design, patented by Lafarge, divides its thermal conductivity by three compared to a standard concrete; this significantly limits heat losses in buildings.  

Therefore, in cases of interior thermal insulation, this new concrete reduces the impact between building facades and intermediate floor by 35 per cent in terms of thermal bridges. These results are the fruit of Lafarge’s research laboratory that has worked on a novel concrete mix design resulting in a product 40 per cent less dense than a standard concrete.  

Thermedia 0.6 B is produced at a batching plant and then cast on-site; it requires no changes of building methods. Its fluidity and very good workability make it a material that is easy to use in traditional construction methods. Its intrinsic properties (mechanical, durability and shrinkage, as well as its fire behavior, acoustics and seismic strength) have already been tested and certified conforming with the NF EN 206-1 standard.