Abstract:Objective : The objective of this study is to investigate the impact of gold tailings content on the sulfate resistance of cement mortar, aiming to enhance mortar performance and utilize solid waste resources more effectively. Methods : 1. In this study, gold tailings were utilized as a partial replacement for fine sand at 30% and 60%, resulting in the preparation of cement mortar specimens. A sulfate solution was employed to simulate an environment prone to sulfate attack. The compressive strength, flexural strength, erosion-induced compressive strength reduction, ultrasonic damage characteristics, and stress-strain behavior of the cement mortar were evaluated. Results : After substituting 30% of fine sand with gold tailings, the compactness of cement mortar was significantly enhanced, leading to a more than 20% increase in compressive strength compared to the unreplaced samples. Simultaneously, the incorporation of gold tailings effectively impeded the ingress of external sulfate ions. Following sulfate attack, the mortar exhibited an initial strength gain followed by a subsequent decline. The degree of damage in mortar after 28 days of substitution decreased by approximately 20% when compared to that observed in unreplaced samples. Conclusion: Appropriate replacement of fine sand with gold tailings enhances both the compactness and durability of cement mortar. Significance : A significant body of research has demonstrated the potential utilization of gold tailings in concrete products; however, further investigation is required to enhance its resistance against sulfate attack. This study aims to offer valuable insights into the elimination of gold tailings and the enhancement of cement mortar's resistance to sulfate attack.