Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Combined Potential of Quarry Waste Fines and Eggshells for the Hydrothermal Synthesis of Tobermorite at Varying Cement Content

Shem Quiawan Saldia
* ORCID logo ,
Hernando P. Bacosa
,
Maria Cristina Vegafria
,
Joshua B. Zoleta
ORCID logo ,
Naoki Hiroyoshi
,
Christian Dagunsa Calleno
,
Wilyneth Sindico Cantong
,
Ephraim Ibarra
,
Maricar Aguilos
ORCID logo ,
Ruben F Amparado
ORCID logo
Version 1 : Received: 29 November 2023 / Approved: 30 November 2023 / Online: 30 November 2023 (04:19:46 CET)

A peer-reviewed article of this Preprint also exists.

Saldia, S.; Bacosa, H.; Vegafria, M.C.; Zoleta, J.; Hiroyoshi, N.; Empig, E.; Calleno, C.; Cantong, W.; Ibarra, E.; Aguilos, M.; Amparado, R., Jr. Combined Potential of Quarry Waste Fines and Eggshells for the Hydrothermal Synthesis of Tobermorite at Varying Cement Content. Sustainability 2024, 16, 2401. Saldia, S.; Bacosa, H.; Vegafria, M.C.; Zoleta, J.; Hiroyoshi, N.; Empig, E.; Calleno, C.; Cantong, W.; Ibarra, E.; Aguilos, M.; Amparado, R., Jr. Combined Potential of Quarry Waste Fines and Eggshells for the Hydrothermal Synthesis of Tobermorite at Varying Cement Content. Sustainability 2024, 16, 2401.

Abstract

Quarry waste fines and eggshells are unavoidable wastes which relentlessly contribute to environmental load and pollution. Although a number of studies have suggested various methods for recycling, these wastes remain underutilized due to some technical constraints. In addition, no study has yet been explored on the possibility of combining quarry waste fines (QWF) and eggshell powder (ESP) for tobermorite synthesis. Tobermorite is the main component which primarily provides strength to the autoclaved aerated concrete products. For this purpose, this study seeks to evaluate the potential of QWF- ESP mix at 10%, 15% and 20% amounts of cement, respectively. The XRF, XRD, and TGA–DTA techniques were used to characterize the waste materials while physical and mechanical property tests and XRD analysis were performed on the autoclaved samples. It was found that QWF contains 53.77% SiO2, while ESP contains 97.8% CaO which are key components for tobermorite synthesis. This study also revealed that the mixture with only 10% cement has the highest compressive strength among the QWF-ESP samples. Furthermore, the formation of tobermorite in the samples was confirmed through XRD analysis. Hence, the hydrothermal curing of QWF –ESP can be further developed to produce functional tobermorite – bearing materials.

Keywords

eggshells; hydrothermal synthesis; quarry waste fines; tobermorite

Subject

Environmental and Earth Sciences, Sustainable Science and Technology

Copyright: 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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