TAKING INTO ACCOUNT THE CO2 STORAGE CAPACITY OF A BUILDING THROUGHOUT ITS ENTIRE LIFE CYCLE: CASE STUDY ON AZIYADE STUDENT RESIDENCE IN LA ROCHELLE

Author(s): P-Y. Mahieux, Ph. Turcry, A. Seigneurin, A. Chatel, M. Taugamoa, J. Michaud
Paper category: Proceedings
Book title: CO2STO2019 - International Workshop CO2 Storage in Concrete
Editor(s): Assia Djerbi, Othman Omikrine-Metalssi, Teddy Fen-Chong
ISBN:
e-ISBN: 978-2-35158-232-9
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 17-26
Total Pages: 10
Language : English

Abstract: In the context of the future energy regulation of 2020, the French building sector is preparing
to produce positive-energy and low-carbon buildings taking into account the life cycle analysis
of materials (from buildings design to their demolition). With this new approach, everything
suggests that the reinforced concrete structures will be negatively impacted since the
greenhouse gas emissions are between 300 and 400 kg in eq. CO2/m3 of concrete (from the
manufacture of cement to the implementation of concrete on construction site). If multiple
levers are envisaged to reduce the environmental impact as, for example, the use of cements
with low clinker content or the reduction of the volume of structural elements by promoting the
use of high performance concrete, there is another lever on which it is also possible to reduce
their environmental footprint: the storage of CO2 by natural carbonation of concrete throughout
the service life of the structure. If carbonation remains a pathology for reinforced concrete
structures, on the other hand, it allows the storage of a certain amount of atmospheric CO2.
The latter has to be assessed from case studies. The building presented in this case study is
a university residence, named AZIYADE, totally prefabricated in a factory. The vertical and
horizontal bearing elements were dry assembled all together on the construction site. The
outside claddings and inside coatings are made of rough, stamped or polished concrete. These
are the two features of this building which is in service since 2016. Atmospheric carbonation
of this building was modelled using an engineer-model code, namely the fib Model Code 2010,
and with the calculation guide proposed on the European Standard NF EN 16757 in view of
calculating the CO2 uptake by natural carbonation. The CO2 uptake was assessed from the
predicted carbonation depths of the different building elements. For 50 years of service life,
this building should be able to store almost 30 tons eq. CO2, which represents 12 % of CO2
emissions due to the decarbonation of limestone issued for its construction.

Online publication : 2019
Publication type : full_text
Public price (Euros) : 0.00