CONSTRUCTION AND DEMOLITION WASTE INCORPORATION EFFECT OF CO2 UPTAKE DUE TO MORTAR CARBONATION

Author(s): E. Possan, L. Mazurana, I. O. Antonio, E. Rigo, W. A Thomaz
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: 146-155
Total Pages: 10
Language : English

Abstract: The construction industry is one of the biggest contributors to CO2 emission, waste generation
and large part of the raw-material consumption, which generates several negative impacts on
the environment. However, using construction waste as recycled aggregate and carbon
storage in cement matrix (concrete and mortars) can contribute to minimize such problems. In
this sense, the present work aims to evaluate the CO2 uptake due to mortars carbonation,
produced with different rates of construction and demolition waste (CDW). Three different
mortars were produced with replacement of 0, 50 and 100% natural sand by CDW recycled
sand. The CO2 uptake was conducted by thermal analysis for samples exposed to CO2 action
in a laboratory environment for 96 days. Results showed that the incorporation of CDW
recycled aggregate contributes to the CO2 uptake. Mortars with 100% recycled sand can
capture up to 57% more CO2 than those without waste. This process can present an important
contribution by reducing the construction environmental impacts, since cement products are
constantly absorbing CO2 during the construction phase, building service life and in the post-
demolition period.

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