Proceedings pro133 : International Workshop CO2 Storage in Concrete - CO2STO2019

Title: CO2STO2019 - International Workshop CO2 Storage in Concrete Edited by: Assia Djerbi, Othman Omikrine-Metalssi, Teddy Fen-Chong e-ISBN: 978-2-35158-232-9 ISBN: Pages: 279 Publication date: 2019

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 in order to improve the properties of recycled concrete aggregates (RCA) and reduce the environmental impact of concrete.

This workshop focused on the impact of natural carbonation on existing structures and life cycle analysis, on the study of natural and accelerated carbonation of recycled aggregates under laboratory or realistic industrial conditions. Experimental studies and modelling on fast carbonation of cementitious materials were presented.

IFSTTAR and the FastCarb french national project, in partnership with the Association Universitaire de Génie Civil, the École française du béton, the International Federation for Structural Concrete, and RILEM, organized the CO2STO2019 workshop in Marne la vallée France on 24 and 25 June 2019. This brought together experts in the field of carbonation of concrete and the recycling of construction and demolition waste (CDW) from around the world. This workshop dealt with the normative aspect and the feedback of several countries, research at the laboratory scale and development at the industrial scale.

We hope that the scientific contents of the workshop will open new perspectives and new opportunities for further research activities in the field of CO2 storage by concrete and building materials, as part of the urgent and crucial fight against green-house gas emissions, given that even a global warming of 1.5°C (the most optimistic forecast) will cause dramatic changes, as reminded us by Prof. Valérie Masson-Delmotte (member of the IPCC) at her opening conference.

Contents

KEYNOTE LECTURES

THEME A: NATURAL CO2 UPTAKE IN CONCRETE STRUCTURES, LIFE CYCLE ANALYSIS (LCA)

THEME B: NATURAL AND FAST CARBONATION OF RCA

THEME C: FAST CARBONATION OF CEMENTITIOUS MATERIALS