A NEW CARBON DIOXIDE SEQUESTRATION METHOD THROUGH HIGH TEMPERATURE CARBONATION OF CEMENT-BASED MATERIALS

Author(s): D. WANG, T.NOGUCHI, T.NOZAKI, Y. HIGO
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: 195-203
Total Pages: 09
Language : English

Abstract: Increase of carbon dioxide concentration and waste concrete generation give rise to great
public attentions. As for the carbon dioxide emission, cement industry takes up about 6% global
generation. In this study, a new carbon dioxide sequestration method of high temperature
carbonation by using waste of cement-based materials was proposed based on the
experimental results under the condition of carbon dioxide emitted in cement plants. Usually,
the temperature of waste carbon dioxide in a cement factory varies over a wide temperature
range. In the experiments, carbonation behaviour of cement-based materials was evaluated in
a broader temperature range from 20°C to 700°C, and other influencing factors like sample
size and w/c ratio were investigated respectively. Test results indicated that there exist two
carbonation mechanisms at different temperature ranges: from 20°C to 390°C (before 400°C),
the carbonation mechanism is almost same as that under normal temperature in which liquid
water is necessary for carbonate ions dissolution larger w/c ratio and smaller size of samples
correspond to faster carbon dioxide absorption speed; while in higher temperature range of
400°C through 700°C, the dehydration substance of portlandite is the main contribution to
calcium carbonate, and sample size and w/c ratio have minor effect on carbonation speed.
Furthermore, acceleration method was explored by adding liquid water into the samples during
carbonation process, which was proved to enhance carbon dioxide absorption rate.

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