Effect of Sulfate Carrier Addition on the Microstructure of Calcined Clay Blended Cements.

ABSTRACT: This publication builds on a previous paper proving the importance of sulfate carrier addition (sca) on the early compressive strength of calcined clay blended cements, especially when using a 1:1-dominated clay. This paper now aims to identify the background of these preceding findings at the microstructural level. For this purpose, a Portland cement is replaced by a calcined kaolinitic, smectitic and illitic clay to different levels at various sca. The microstructural investigations focus on hydrate phases, porosity and scanning electron microscopy of hardened pastes at 2 and 28 days. The microstructural properties of 2:1-dominated clay blends can be improved by the sca, but the benefit is small compared to 1:1-dominated clay blends. On the other hand, their portlandite content does not

SUBMITTER: Panzer M 

PROVIDER: S-EPMC12608995 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature