Antonovič, V.; Sikarskas, D.; Boris, R.; Kudžma, A.; Malaiškienė, J.; Stonys, R. A Study on the Microstructure and Mechanical Properties of Portland Cement Incorporating Aluminosilicate Waste. Materials2024, 17, 354.
Antonovič, V.; Sikarskas, D.; Boris, R.; Kudžma, A.; Malaiškienė, J.; Stonys, R. A Study on the Microstructure and Mechanical Properties of Portland Cement Incorporating Aluminosilicate Waste. Materials 2024, 17, 354.
Antonovič, V.; Sikarskas, D.; Boris, R.; Kudžma, A.; Malaiškienė, J.; Stonys, R. A Study on the Microstructure and Mechanical Properties of Portland Cement Incorporating Aluminosilicate Waste. Materials2024, 17, 354.
Antonovič, V.; Sikarskas, D.; Boris, R.; Kudžma, A.; Malaiškienė, J.; Stonys, R. A Study on the Microstructure and Mechanical Properties of Portland Cement Incorporating Aluminosilicate Waste. Materials 2024, 17, 354.
Abstract
The influence of aluminosilicate pozzolanic waste, specifically spent fluid catalytic cracking catalyst (FCCW) and metakaolin waste (MK) from expanded glass industry, on the properties of hardened Portland cement paste were analysed. The study involved replacing part of cement with FCCW and MK and observing their impact on hydration, microstructure, density and compressive strength of hardened cement paste. Various analysis methods were employed, including X-ray diffraction (XRD), thermogravimetric analysis (TG), and scanning electron microscopy (SEM), to understand the changes in the structure of hardened cement paste during hydration. The findings revealed that FCCW tends to accelerate cement hydration process due to its high surface area and pozzolanic activity. Notably, the formation of portlandite crystals was observed on FCCW particle surfaces in a specific direction. These crystals appeared smaller and developed in different directions in compositions containing a composite binder with mixture of FCCW and MK in a ratio 1:1. This could be influenced by pozzolanic reactions activated by fine particles of MK and the formation of calcium silicate hydrates (CSH) and calcium alumino silicate hydrates (CASH) in the presence of portlandite. XRD and TG results indicated that the specimens containing a composite binder exhibited the least amount of portlandite. The compressive strength of these specimens increased compared to control specimens, although the amount of cement was 9% lower.
Chemistry and Materials Science, Materials Science and Technology
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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