Le Onze - Eco-responsible jobsite

Le Onze - Eco-responsible jobsite

Chartres, France -

Jobsite description

"Le Onze" residence in Chartres (France) is a 12 housing units, built both in accordance with an environmental new label approach (Positive energy building label with a low carbon footprint), and in favor of circular economy, with the objective to maintain balanced construction costs.
This eco-responsible project was supervised by the local Concrete Industry Federation and the Center for Studies and Research of the Concrete Industry.

Le Onze
Le Onze

Project description & CHRYSO expertise

The main stake of this project was the use of local materials in order to develop a circular economy approach. CHRYSO provided new admixture solutions, fostering the use of local sands and recycled aggregates in the production of concrete, in connection with the eco-responsible approach of this jobsite.

The structural concrete consisted of 30% of Recycled Concrete Aggregates from old building elements in the city of Chartres (both coming from ready-mixed concrete or precast concrete, such as walls, concrete blocks and stairs).


  • CHRYSO®Quad 563
  • CHRYSO®Quad 800
  • CHRYSO®Optima 372
  • CHRYSO®Omega 137 EMx
Le Onze

Project technical challenges

The concrete slab, composed of 100% Recycled Concrete Aggregates, required the development of a specific mix-design. A total of 80 tons of Recycled Concrete Aggregates were reused through this jobsite.

For the precast elements (walls and stairs), the challenge was to use local clay sands (0/4) with high absorption rate, in addition to 8% recycled aggregates (4/10). The concrete produced had a liquid consistency during 45 minutes, while maintening high strength performance superior to 15 MPa.

CHRYSO provided 100% of the admixtures on this construction site. Thanks to CHRYSO®Quad and Enviromix® technologies, a reduction of 360 tonnes of C02 was achieved on the construction site, decreasing the carbon footprint of 20%. "Le Onze" residence also obtained the E2C1 label (Positive energy building label with a low carbon footprint).

New Nantes railway station photo gallery

Project participants

Precast industrial: Spurgin Léonhart
Prefabrication Ready-mix supplier:
Gallaud SAS
Real Estate Developer:
Pierres & Territoires Eure-et-Loir
Project manager / architect:
Yannick Mouton
Engineering Studies Office (E+ C- label):
AET Loriot

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