TY - JOUR
T1 - Microstructure, water permeability and micromechanical properties of alkali activated slag subjected to accelerated leaching
AU - Nguyen, Thi Nhan
AU - Phung, Quoc Tri
AU - Jacques, Diederik
AU - Neji, Mejdi
AU - Dauzeres, Alexandre
AU - Elsen, Jan
AU - Pontikes, Yiannis
N1 - Score=10
Funding Information:
This work received funding (in part) from the Belgian Energy Transition Fund (ASOF project), IRSN (France), and the European Union's Horizon 2020 Research and Innovation Programme for Nuclear Fission and Radiation Protection Research (Call NFRP-2019-2020) under grant agreement No. 945098 (PREDIS).
Funding Information:
This work received funding (in part) from the Belgian Energy Transition Fund (ASOF project), IRSN (France), and the European Union’s Horizon 2020 Research and Innovation Programme for Nuclear Fission and Radiation Protection Research (Call NFRP-2019-2020) under grant agreement No. 945098 (PREDIS).
Publisher Copyright:
© 2024 The Author(s)
PY - 2024/2/1
Y1 - 2024/2/1
N2 - This study investigated the leaching resistance of alkali activated slag mortars (AAS) under immersion in a 6 M NH4NO3 solution for a duration of up to 28 days, taking into consideration the effect of water-to-binder (w/b) ratio. SEM-EDS analysis revealed decalcification, desodiumization, and dealumination in AASs during leaching, leading to changes in the microstructure and micro-mechanical properties of the materials. A combination of N2-adsorption and MIP analysis demonstrated that there was a coarsening of the structure and an increase in porosity along the depth of degradation in the leached AAS. The predominant pore framework in the leached materials was found to be capillary pores. Furthermore, the elastic modulus and micro-hardness of AAS decreased after 28 days of leaching, as evidenced by micro-indentation. The water permeability of AASs exhibited an exponential rise with the increase in porosity, both before and after leaching, as a consequence of the changes in microstructure. Notably, the w/b ratio significantly influenced the leaching rate, microstructure, and water permeability of the AAS.
AB - This study investigated the leaching resistance of alkali activated slag mortars (AAS) under immersion in a 6 M NH4NO3 solution for a duration of up to 28 days, taking into consideration the effect of water-to-binder (w/b) ratio. SEM-EDS analysis revealed decalcification, desodiumization, and dealumination in AASs during leaching, leading to changes in the microstructure and micro-mechanical properties of the materials. A combination of N2-adsorption and MIP analysis demonstrated that there was a coarsening of the structure and an increase in porosity along the depth of degradation in the leached AAS. The predominant pore framework in the leached materials was found to be capillary pores. Furthermore, the elastic modulus and micro-hardness of AAS decreased after 28 days of leaching, as evidenced by micro-indentation. The water permeability of AASs exhibited an exponential rise with the increase in porosity, both before and after leaching, as a consequence of the changes in microstructure. Notably, the w/b ratio significantly influenced the leaching rate, microstructure, and water permeability of the AAS.
KW - Alkali activated slag
KW - Leaching resistance
KW - Microstructure
KW - Permeability
KW - Micromechanical property
UR - https://ecm.sckcen.be/OTCS/llisapi.dll/open/82474493
UR - http://www.scopus.com/inward/record.url?scp=85184997784&partnerID=8YFLogxK
U2 - 10.1016/j.matdes.2024.112706
DO - 10.1016/j.matdes.2024.112706
M3 - Article
SN - 0261-3069
VL - 238
JO - Materials and Design
JF - Materials and Design
M1 - 112706
ER -