Reinforced concrete is responsible for 75 % world wide CO₂ emissions derived from the construction sector. For this reason it is necessary to introduce ways to reduce the environmental impact of concrete when substitution by more environmentally friendly building systems is not possible or available.
1. To use recycled aggregate (ceramic, construction waste or from excavation) when it’s possible (floor slabs, concrete filling, etc.). It is essential to control the particle size and the presence of sulfates derived from gypsum which prevents structural use.
2. To study the environmental impact of all elements involved in concrete construction (release agents, shuttering panels, bar supports, etc.).
3. To control coatings to ensure a life cycle as long as possible. In fact this is one of the main environmental problems of concrete in the log term, since it’s usually supposed a maximum life about 25-30 years because of the steel bars rust.