<![CDATA[The increase in infrastructure development in Indonesia has directly impacted the high demand for concrete. The increased use of concrete has the potential to cause negative effects on the environment. To support sustainable infrastructure development, innovative concrete has been developed by utilizing stone dust as a partial substitute for fine aggregate. This study aims to determine the optimum content of stone dust as a partial substitute for fine aggregate on the tensile strength and modulus of rupture of concrete. The research method used is the experimental method. The concrete mix design uses variations of stone ash at 0%; 5%; 10%; 15%; and 20% of the weight of the fine aggregate. The test specimens for the split tensile strength test are cylindrical with a diameter of 15 cm and a height of 30 cm, while the test specimens for the modulus of rupture test are beam-shaped with a width of 10 cm, height of 10 cm, and length of 40 cm, and all specimens are tested at 28 days old. Hardened concrete testing for split tensile strength uses a Compression Testing Machine, and modulus of rupture testing uses a Universal Testing Machine. The results of the split tensile strength test were 2,45 MPa; 2,57 MPa; 2,64 MPa; 2,78 MPa; and 2,71 MPa, with R² = 0,923. The results of the modulus of rupture test were 4,00 MPa; 4,32 MPa; 4,62 MPa; 5,10 MPa; and 4,85 MPa, with R² = 0,909. The split tensile strength and modulus of rupture reached their optimum values at stone ash contents of 17,83% and 19,31%, respectively. ]]>
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