STENT uses Very Large Wood from our forests, to create long-span wood-concrete slabs on parking lots or existing roads, which can receive intensive revegetation, in order to create soft-mode walks, accommodate public transport, and photovoltaic modules, in order to participate in the fight against global warming by capturing and storing atmospheric CO2 in construction for more than a century.
The TGB logs are positioned “head to tail” to compensate for their taper. The wood must be dried to 30% by natural drying before installation. Drying must be able to continue up to 20% once the logs have been processed by natural ventilation.
Notches are machined into each log to create a “button” to absorb the shearing forces. Continuous reinforced concrete stiffeners in these cutouts ensure the rigidity of the panels for transport and avoid the “piano effect”. Shrinkage due to drying occurs log by log because of the dovetail which imposes its position in space. The treatment of the supports at the ends takes into account this withdrawal at altitude if it is detrimental to the structure.
The evolution of STENT compared to previous work on collaborative wood-concrete slabs is the elimination of metal connectors, in order to simplify implementation and limit embodied energy.
Collaborative wood concrete slab using logs from 60cm to 1m in diameter, combined with a concrete compression slab of at least 15cm, for spans of 8 to 16m, receiving overloads of 250 to 1000 daN/m2 for an arrow of 1/400th, allowing a intensive revegetation of 30 to 50cm of soil and the installation of photovoltaic panels at a rate of 25kg/m²
Gray energy consumption: 300 kWh/m² (50% savings compared to a concrete slab of equivalent span)
Carbon storage: 300kg/m² (instead of emitting 300kg/m² with a concrete slab of equivalent range)