Title: Chloride Diffusion in Geopolymers Containing Phase Change Materials

Author(s): Bouha EL MOUSTAPHA, Stéphanie BONNET, Abdelhafid KHELIDJ

Publication: Symposium Paper

Volume: 362

Issue:

Appears on pages(s): 763-773

Keywords: chloride diffusion, durability, geopolymer, microencapsulated phase change materials, mechanical strength

DOI: 10.14359/51742007

Date: 6/17/2024

Abstract:
The aim of this research is to examine the steady-state chloride migration properties of blast-furnace slag-based geopolymer mortars (GPMs) and Portland cement-based mortars (CMs). Three grades of microencapsulated phase change materials (MPCM) were used: 0%, 5%, and 10%. In addition, three rates of metakaolin (MK), namely 0%, 10%, and 20% were added to study their influence on geopolymer performance. The results show that the addition of MK increased the compressive strength of GPM-MPCM by around 10 MPa (1450 psi). On the other hand, the addition of MK also reduced chloride migration due to physical bonding on CASH and NASH gels. These effects are due to the high reactivity of MK, which favored good dissolution of silica and aluminum in MK, which participated well with calcium in GBFS to create the NASH and CASH gels. These gels improved geopolymer performance. Finally, all GPMs-MPCM showed improved mechanical performance and durability compared with CM.