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Engineering Cementitious Composites (ECC) represents a significant advancement in concrete technology, addressing the issues and limitations of conventional concrete and environmental challenges related to sedimentation in rivers like the Yellow River in China. This study investigates the integration of Yellow River Sand (YRS) into ECC mix designs for sustainable development. YRS replacement rates (0%, 25%, 50%, 75%, and 100%) with quartz sand are systematically analyzed through flexural, compressive, uniaxial tensile, and four-point bending tests. In addition, SEM and MIP tests are conducted to investigate the micro-mechanical properties. The results reveal that the optimal mechanical performance with 100% YRS substitution improved the compressive and flexural strength of 26.4 MPa and 11.5 MPa, respectively. These values are 6.20% lower than the 0% substitution rate. Notably, a replacement …