<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>Calcium-alumina-silicate-hydrate (C-A-S-H) is the main hydration product formed in Portland composite cement pastes. C-A-S-H is a key phase with regard to the strength and durability of concrete. Proper characterization of C-A-S-H is difficult due to intermixing with other phases, thus limiting the applicability of point scan analyses using scanning electron microscopy (SEM). Recent advances have enabled the use of hypermaps from energy dispersive spectroscopy (EDS) to investigate hydrate phases with better statistics. This study investigated how increased curing temperature and the inclusion of pozzolanic SCMs change the composition of the C-A-S-H, using the edxia plugin and SEM-EDS hypermaps. Composite cement pastes were cured at 20, 38, and 60°C for 180 days before analysis. We discuss the interpretation of the data from hypermaps in comparison to the traditional point scan approach.</p>
</abstract>

Calcium-alumina-silicate-hydrate (C-A-S-H) is the main hydration product formed in Portland composite cement pastes. C-A-S-H is a key phase with regard to the strength and durability of concrete. Proper characterization of C-A-S-H is difficult due to intermixing with other phases, thus limiting the applicability of point scan analyses using scanning electron microscopy (SEM). Recent advances have enabled the use of hypermaps from energy dispersive spectroscopy (EDS) to investigate hydrate phases with better statistics. This study investigated how increased curing temperature and the inclusion of pozzolanic SCMs change the composition of the C-A-S-H, using the edxia plugin and SEM-EDS hypermaps. Composite cement pastes were cured at 20, 38, and 60°C for 180 days before analysis. We discuss the interpretation of the data from hypermaps in comparison to the traditional point scan approach.

Determining the Influence of Curing Temperature and SCMs on C-A-S-H Composition Using SEM-EDS Hypermaps

Nordic Concrete Research

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Calcium-alumina-silicate-hydrate (C-A-S-H) is the main hydration product formed in Portland composite cement pastes. C-A-S-H is a key phase with regard to the...

Determining the Influence of Curing Temperature and SCMs on C-A-S-H Composition Using SEM-EDS Hypermaps

Published Online: Jul 05, 2024

Page range: 125 - 146

Received: Apr 02, 2024

Accepted: Jun 24, 2024

DOI: https://doi.org/10.2478/ncr-2024-0006

Keywords
SEM-EDS, characterization, C-S-H, SCM, fly ash, volcanic pozzolana

© 2024 Petter Hemstad et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Determining the Influence of Curing Temperature and SCMs on C-A-S-H Composition Using SEM-EDS Hypermaps

Published Online: Jul 05, 2024

Page range: 125 - 146

Received: Apr 02, 2024

Accepted: Jun 24, 2024

DOI: https://doi.org/10.2478/ncr-2024-0006

KeywordsSEM-EDS, characterization, C-S-H, SCM, fly ash, volcanic pozzolana

© 2024 Petter Hemstad et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
SEM-EDS, characterization, C-S-H, SCM, fly ash, volcanic pozzolana