Durability and Sustainability Evaluation of Cementless Mortar with Stainless Steel Slag

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This study examines the mechanical performance, cost-effectiveness, and environmental impact of steam-cured cementless mortar incorporating stainless steel slag (STS slag) with ground granulated blast furnace slag (GGBFS) and natural gypsum. As the STS replacement ratio increased, flowability decreased by about 15%, while air content remained within acceptable limits. The STS10 mixture retained over 90% of the control’s compressive strength. Life cycle cost (LCC) analysis showed overall cost reductions of 3.6, 7.1%, and cost–benefit (CBA) evaluation yielded positive net present values and internal rates of return exceeding standard discount rates, confirming economic feasibility. Life Cycle Assessment (LCA) indicated continuous decreases in life-cycle CO₂ emissions with higher STS contents, with additional reductions of 4.4% and 8.8% in the construction phase for STS10 and STS20, respectively. Overall, incorporating 10% STS slag under steam curing offers an optimal balance of mechanical performance, economic efficiency, and environmental sustainability.

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151-157

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May 2026

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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