C-S-H with different Ca/Si ratios, formed from the hydration and pozzolanic reactions of blended cement paste, are the major calcium-bearing phases which react with CO2 during the carbonation. Therefore, it’s important to study the carbonation rate of different C-S-H phases. In this paper, the C-S-H phases (Ca/Si ratio: 0.66 to 2.0) were synthesized and used for the accelerated carbonation test with the CO2 concentration of 3%±0.2. Synthesized C-S-H phases with different Ca/Si ratio were identified by 29Si nuclear magnetic resonance (NMR). Carbonation rate and products of different C-S-H phases were studied by NMR and Fouriertransform infrared spectroscopy (FTIR). The results show that C-S-H phases with different Ca/Si ratio (lower than 1.40) was synthesized. C-S-H with lower Ca/Si ratio is decomposed faster than that with a higher Ca/Si ratio. After three days’ accelerated carbonation, the C-S-H phases with different Ca/Si ratio were all fully decomposed to CaCO3 and silica gel.
Original languageEnglish
Title of host publication4th International Conference on Service Life Design for Infrastructures
Subtitle of host publication(SLD4) 27-30 August 2018 – Delft, Netherlands
EditorsGuang Ye, Yong Yuan, Claudia Romero Rodriguez, Hongzhi Zhang, Branko Šavija
PublisherRilem
Pages167-170
ISBN (Electronic)978-2-35158-213-8
Publication statusPublished - 2018
Event4th International Conference on Service
Life Design for Infrastructures
- Delft, Netherlands
Duration: 27 Aug 201830 Aug 2018
Conference number: 4

Publication series

NameRilem proceedings
PublisherRilem
NumberPRO 125

Conference

Conference4th International Conference on Service
Life Design for Infrastructures
Abbreviated titleSLD4
CountryNetherlands
CityDelft
Period27/08/1830/08/18

    Research areas

  • C-S-H, Ca/Si ratio, carbonation rate

ID: 46710917