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.
![](https://www.chryso.com/wp-content/uploads/2022/08/Le-Onze-Chartres-CHRYSO-Quad-5-1024x693.jpg)
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).
![](https://www.chryso.com/wp-content/uploads/2022/08/Le-Onze-Chartres-CHRYSO-Quad-1-1024x683.jpg)
PRODUCTS USED
- CHRYSO®Quad 563
- CHRYSO®Quad 800
- CHRYSO®Optima 372
- CHRYSO®Omega 137 EMx
- CHRYSO®Tard CHR
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).
![](https://www.chryso.com/wp-content/uploads/2022/08/Le-Onze-Chartres-CHRYSO-Quad-3-1024x683.jpg)
LE ONZE – ECO-RESPONSIBLE 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