Evaluating the dual role of sea water and metakaolin in the performance, efflorescence mitigation, and phase composition of sodium silicate-activated marble powder

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment Pub Date : 2024-12-26 DOI:10.1016/j.dibe.2024.100596

Amira A. Shereiqi , Khalifa Al-Jabri , Mohammed S. Meddah , Kazi Md Abu Sohel , Alaa A. Saleh , Hamdy A. Abdel-Gawwad

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引用次数: 0

Abstract

Marble waste (MW) poses a significant environmental challenge due to its large quantities and difficulty in disposal. This study explored the full utilization of MW powder in creating binder. Combining MW with sodium silicate (Na₂SiO₃) results in the formation of calcium silicate hydrate (C-S-H) and pirssonite. The resulting binder demonstrated a compressive strength of 15–25 MPa after 28 days of air curing. Using metakaolin provides the system with dissolved aluminosilicate, which mitigates efflorescence through a neutralization process and enhances the compressive strength of the resulting hardened binder. Seawater also proved effective in reducing efflorescence by decreasing the solubility of pirssonite. Moreover, mixing seawater with Na₂SiO₃ induced the formation of nanoprecipitates, which positively affects the mechanical performance of the resultant binder. For sustainable building practices, using seawater as a mixing water for unreinforced building products is recommended. This conserves freshwater, making it available for other critical applications.

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来源期刊

Developments in the Built Environment Multiple-

CiteScore

7.40

自引率

1.20%

发文量

审稿时长

22 days

期刊介绍： Developments in the Built Environment (DIBE) is a recently established peer-reviewed gold open access journal, ensuring that all accepted articles are permanently and freely accessible. Focused on civil engineering and the built environment, DIBE publishes original papers and short communications. Encompassing topics such as construction materials and building sustainability, the journal adopts a holistic approach with the aim of benefiting the community.