In a significant breakthrough for sustainable construction practices, researchers have unveiled a novel method for utilizing marble waste powder as a binder in building materials. This innovative approach not only addresses the environmental challenges posed by marble waste but also enhances the mechanical performance of construction materials. The study, led by Amira A. Shereiqi from the Civil and Architectural Engineering Department at Sultan Qaboos University, demonstrates how the combination of sodium silicate and marble waste can yield impressive compressive strengths, ranging from 15 to 25 MPa after just 28 days of air curing.
Shereiqi’s research delves into the dual role of seawater and metakaolin in this process, revealing that metakaolin contributes dissolved aluminosilicate, which plays a crucial role in mitigating efflorescence—a common issue in construction that can lead to unsightly and damaging salt deposits on surfaces. “By incorporating metakaolin, we not only enhance the strength of the binder but also tackle the efflorescence problem effectively,” Shereiqi stated, highlighting the dual benefits of this approach.
The use of seawater in the mixing process further amplifies these advantages. The study found that seawater reduces the solubility of pirssonite, a compound formed during the reaction, thereby minimizing efflorescence. Moreover, when mixed with sodium silicate, seawater facilitates the formation of nanoprecipitates that bolster the mechanical performance of the binder. This is particularly relevant for the construction sector, where the demand for sustainable and high-performance materials is ever-increasing.
Shereiqi advocates for the adoption of seawater in the production of unreinforced building products, suggesting that this practice could conserve freshwater resources for other critical uses. “Utilizing seawater not only addresses environmental concerns but also presents a practical solution for the construction industry, which is often water-intensive,” she noted. This perspective could lead to a paradigm shift in how the industry approaches material sourcing and resource management.
The implications of this research extend beyond environmental benefits; they present significant commercial opportunities for the construction sector. As companies increasingly seek sustainable solutions, the ability to produce high-strength materials from waste could position them ahead of regulatory pressures and market demands for greener practices.
The findings are published in the journal ‘Developments in the Built Environment’, which translates to “Avances en el Entorno Construido”. As the construction industry grapples with sustainability challenges, Shereiqi’s work could pave the way for innovative practices that not only reduce waste but also enhance the durability and performance of building materials. For more information on this research and its implications, you can visit Sultan Qaboos University.
