Enhancing the Mechanical Properties of Alkali-Activated Mortar with Graphene Quantum Dots

Abstract

Graphene quantum dots (GQDs) are nanoscale carbon particles with exceptional properties, making them highly suitable for a wide range of applications. In this study, GQDs were incorporated into alkali-activated mortar (AAM) to enhance their workability and mechanical performance. The GQDs were added at dosages of 0.3%, 0.6%, 0.9%, and 1.2% by weight of fly ash. The study investigates the impact of GQDs on key properties of AAM, including compressive strength, flexural strength, porosity, environmental impact, and eco-strength efficiency. The results showed that the addition of 0.3% GQDs significantly improved mechanical strength, with a 39.1% increase in compressive strength compared to the control mixture without GQDs. Flexural strength and porosity were also evaluated and are discussed in detail. Environmental impact analysis revealed that higher GQD content led to a reduction in carbon emissions. Additionally, the eco-strength efficiency assessment demonstrated that the mix containing 0.3% GQDs achieved the highest eco-strength efficiency among all tested mixes. This finding underscores the potential of GQD-enhanced AAM for practical, sustainable applications.