Accelerated carbonation of recycled concrete aggregates: the FastCarb project

Author(s): Jean Michel Torrenti
Paper category: Proceedings
Book title: Proceedings of the International Conference on Sustainable Materials Systems and Structures (SMSS2019) Durability, Monitoring and Repair of Structures
Editor(s): Ana Baričević, Marija Jelčić Rukavina, Domagoj Damjanović, Maurizio Guadagnini
ISBN: 978-2-35158-217-6
e-ISBN: 978-2-35158-218-3
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 405-412
Total Pages: 813
Language: English

Abstract: The FastCarb project is the result of the conjunction of two facts. On one hand, the production of cement is an important source of CO2 in the world (5-7% of the total emissions). Around two thirds of these emissions are due to de-carbonation of limestone during the Portland cement manufacturing process. On the other hand, a large quantity of recycled concrete coming from the deconstruction is available while natural resources have to be preserved. Even if recycled concrete aggregates (RCA) can already be used in concrete by adjusting mix designs, their larger porosity has an impact on the performances. However recycled aggregates incorporate portlandite and hydrated silicates that can be carbonated in a faster way. The aim of the FastCarb project is to store CO2 in RCA, improving the quality of these aggregates by the clogging of the porosity and finally decreasing the CO2 impact of concrete in structures. It has two main objectives: to optimize in laboratory conditions of the accelerated carbonation process which can be transposed at industrial scale at a suitable cost and to show that the process could be used in industrial conditions.

Online publication :2019
Publication type : full_text
Public price (Euros) : 00