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A first at Bouygues Bâtiment Grand Ouest

The first concretes based on H-UKR N cement from Hoffman Green Cement Technologies were poured in January on the Ilot Adam site in the new République district in Île de Nantes and will be completed in March. The trial involves approximately 42 m3 of walls and floors in the 39-unit building and represents a saving of 4 tonnes of CO2 compared to traditional cement. When the formwork was removed, the teams discovered a green/blue concrete which, following a few days of oxidation, became creamy white. The trials are continuing on the two office buildings with the installation of prefabricated ‘Detctor’ straight flight staircases also containing H-UKR N cement. These prefabricated staircases will also save 10 tonnes of CO2. In total, thanks to the walls, floors and staircases made from H-UKR N, the equivalent of 14 round trips by plane from Paris to New York for one person will be saved!


Following on from Ilot Adam, the trial has been continued with the pouring of a floor and a wall on the site of the Physical Medicine and Rehabilitation Centre (Centre de Médecine Physique et de Réadaptation - CMPR) at Saint-Jacques Hospital, before wider use next September on Les Noisetiers inclusive housing in Angers.

A closer look at H-UKR
H-UKR is a cement with 0% clinker, manufactured cold using industrial by-products and activators from the chemical industry. This cement, with its absence of clinker, has a carbon footprint which is three times smaller than that of traditional cement.

Decarbonising our business by acting now on our projects

These various trials are in line with the Group's decarbonisation strategy. This is illustrated at Bouygues Bâtiment Grand Ouest by a number of initiatives, including reducing the carbon footprint of our concrete. 
In 2022, the widespread use of the Scanbéton tool on Bouygues Bâtiment Grand Ouest sites enabled us to define our starting point. By reporting on the actual quantities of concrete formulas used, we can now automate the true carbon weight calculation of our sites.
For example, from January to the end of December 2022, ScanBéton calculated an average quantity of 204.12 KgCO2/m3 of concrete poured. To achieve our carbon reduction target (30% reduction), we must rapidly reach 170 kg of CO2 /m3 on our construction sites and then go beyond this threshold. 

The way forward is clear and we are committed to it! Watch this space!

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