<![CDATA[In this era, the automotive industry has developed along with the increase in tire production which has resulted in an increase in tire rubber waste which is difficult to decompose naturally. Therefore, processing and utilization of tire rubber waste is needed. To overcome environmental pollution due to used tire waste, one way is to make fine aggregate substitute material in concrete to reduce costs and overcome environmental pollution. This research was carried out at the Civil Engineering Laboratory of the Sriwijaya State Polytechnic. By analyzing whether tire rubber waste can be used as a substitute for fine aggregate with percentages of 5%, 10% and 15% can increase the flexural strength of concrete, this is the aim of this study. This testing was carried out at the ages of 7 days, 14 days and 28 days, with test objects in the form of blocks measuring 60 cm × 15 cm × 15 cm. The test results for normal concrete aged 28 days were 3.17 MPa, concrete mixed with rubber tire waste aged 28 days the percentage was 5% which was 3.48 MPa, the percentage of 10% was 4.13 MPa and the percentage of 15% was 2.88 MPa. From the results of flexural strength data, percentage]]>
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