Utilization of Eggshell Powder in Cement Mortars: Enhancing Mechanical and Thermal Properties for Sustainable Construction

作者：Emre Tavlı, Reha Artan · 发表于：The Open Construction & Building Technology Journal · 年份：2026 · DOI：10.2174/0118748368445575251210172203

Given the critical role of cement in the construction industry and its significant impact on global climate change, there is an urgent need to develop alternatives to the traditional clinker-based cement. In this study, the Eggshell Powder (ESP), used as a partial cement replacement in mortar, with an emphasis on its thermal behavior, passive indoor temperature regulation, and synergistic interactions with multiple supplementary cementitious materials, namely, Fly Ash (FA), Silica Fume (SF), and Blast Furnace Slag (BFS), was investigated. The effects of ESP on shear strength were also investigated, as they have not been extensively documented. Distinctively, this research implemented a large-scale screening of 60 mix designs (360 specimens) to maximize cement reduction while maintaining, or even improving, mechanical performance relative to the control. Mortars with ESP at 0, 10, 15, and 20 wt.% were tested for flow (EN 1015-3) and flexural and compressive strengths at 7 and 28 days (EN 196-1). Shear strength at 28 days was measured using the Z-push-off method. Blended (ternary and quaternary) mixes replaced 30 wt.% of cement through combinations of ESP, FA, SF, and BFS. Thermal behavior was monitored using chambers (7 × 15 × 15 cm; wall thickness = 4 cm) made with 0, 15, 30, and 50 wt.% ESP over 30 days, with temperature readings taken at 09:00, 12:00, 15:00, 19:00, and 00:00 via type-K thermocouples. Results were summarized as average values. Workability...