Objectives
In response to the demographic growth in the Seine-et-Marne region, the Ile-de-France Region appointed COSA - Colboc Sachet Architecture to design the extension and renovation of the Henri-Becquerel secondary school in Nangis. Built in 1991, this building could initially accommodate up to 500 pupils. This restructuring project will enable the school to increase its capacity from 700 to 1,200 pupils. The new building will house the new half-board, 1,600 m² of additional teaching space and 990 m² of school life and administration space.
CRAterre was commissioned by the Ile de France Region to help integrate raw earth into this extension project. The load-bearing timber-framed building will feature 600m² of interior masonry made of extruded bricks produced from quarry soil (De Wulf brickworks) and 1,300m² of exterior masonry made of compressed and stabilised raw earth bricks produced from excavation spoil (BC Materials).
Within this framework, a Type-B Experimental Technical Assessment (ATEx) has been validated with the CSTB concerning the use of Extruded Earth Bricks as interior facing and Stabilised Compressed Earth Bricks as exterior façade facing. The main challenges addressed concerned the justification of the behaviour of earthen materials (produced from excavated soils and stabilised with 3% cement) when exposed to weather conditions, as well as the compatibility of masonry deformations with the load-bearing timber structure.
The ATEx also covers the use of recycled burnt bricks in certain areas of the façade more exposed to weather conditions.
Partners
COSA (architect)
COFIBAT
BC Materials
Wulf Brickworks
Financing
Ile-de-France region
IDF Construction Durable
Resource
https://www.cosa-paris.com/portfolio/lycee-general-et-technologique-henri-becquerel-nangis-77/
