Prelude

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Decreasing natural resources of sand and gravel and increasing problems with waste management support the recycling of the accumulating waste materials. If the vision of a sustainable material flow is to be realized, the amount of recycled waste has to be increased. The building industry in particular is a major consumer of materials and at the same time a major producer of waste and CO2 emissions by production of Portland cement which represents 5 to 8% of CO2 emissions worldwide. CO2STO2019 « CO2 storage in concrete » focuses on the ability of concrete to store CO2 during its life cycle. Concrete undergoes natural carbonation during service life of structures. At the end of its service life, accelerated carbonation of recycled concrete as aggregates for new concretes can take place, to improve the properties of recycled concrete aggregates (RCA) and reduce the environmental impact of concrete.

This workshop is focused on the study of accelerated carbonation of recycled aggregates in laboratory and under realistic industrial conditions. Presentations of experimental studies and modelling are expected. Economic and environmental analyses are also necessary to implement a database of the manufacture of concretes based on carbonated recycled concrete aggregates. Impact of natural carbonation on existing structures will complete the topics of the workshop.

In conclusion, the workshop CO2STO2019, which will take place in Marne la Vallée, France, on 24-26 June 2019, will bring together experts in the field of carbonation of concrete and recycling of construction and demolition waste (CDW) from around the world. This workshop is supported by french national project FastCarb. 

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