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International audienceThe objective of this study is to demonstrate and to study the sustainability and the qualities of the earthen construction in real conditions. A demonstrative building was designed and built with unfired clay bricks, were industrially produced by the factory “Briqueteries du Nord” (BdN). This industrial plant is located in the north of France. This project aims to create conditions for the development of earthen construction techniques in the north of France. Moreover, it aims to prove the benefits of this material on the sanitary quality of the building.This article is composed of three parts. Firstly, the identification of raw materials was performed in order to study the mains properties of these building materials. The second part of this work presented an experimental study conducted to investigate the dynamic thermal performance of unfired clay bricks.To complete the tests already carried out in laboratory, an experimental investigation was carried out in situ on a demonstrative building. The hygrothermal performance of building is monitored for two consecutive years. The first analysis of the obtained data proved clearly that the earthen wall reduces the fluctuations of the outside temperature

In this study, the potential for reuse of waste brick (WB) by alkaline activation in a new geopolymer brick was examined. The effect of the incorporation of ground granulate blast furnace slag (GGBFS), the molarity of sodium hydroxide (NaOH) and the silicate to sodium hydroxide ratio (Na 2 SiO 3 /NaOH) on the mechanical properties of the final product was investigated. The manufacturing of geopolymer bricks was carried out by mixing WBs, GGBFS, sand with a solution of hydroxide and sodium silicate. The samples were prepared according to different formulations. The optimal compressive strength obtained is 89.91 MPa, for a GGBFS/WB ratio of 80/20, an 8 M molarity of NaOH and a silicate/hydroxide ratio of 2/1. This study shows an effective feasibility for the recovery and recycling of industrial waste into a valuable product for the construction sector. This recycling method can bring environmental and economic benefits by using it as an alternative material to fired brick in construction. Given the results obtained, it will be interesting to study the environmental and economic impact as well as the durability properties of these geopolymer bricks. Graphical abstractKeywords Geopolymer · Recovery of waste bricks · GGBFS · Reuse · Alkaline activation · Compressive strength