Experimental assessment of shear behavior of crumb rubber intermixed steel slag used as railway subballast

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4. Experimental assessment of shear behavior of crumb rubber intermixed steel slag used as railway subballast

Steel slag and crumb rubber are two waste products obtained from steel industries and waste tyre, respectively. The current study investigated the shear behavior of steel slag and granite subballast particles mixed with crumb rubber under direct shear condition. In addition, Los Angeles abrasion, single particle crushing strength, water absorption, specific gravity, and impact value tests were conducted on steel slag and granite subballast particles. Test results revealed that steel slag exhibited higher abrasion resistance, crushing strength, specific gravity, water absorption, and impact resistance compared to granite. Further, direct shear test results revealed that irrespective of the proportion of crumb rubber, steel slag exhibited higher value of peak friction angle and peak dilation angle compared to granite subballast. For instance, the value of and in case of steel slag was found to be 49.21° and 10.95° whereas in case of granite the value of and was found to be 44.36° and 8.56° respectively (proportion of crumb rubber = 10%; Normal stress = 30 kPa; S_r = 3 mm/min). Results further revealed that with the increase in the proportion of crumb rubber the value of and both in case of steel slag and granite decreases. Based on the results, an optimal content of 9% crumb rubber is recommended to blend in steel slag. This allows the composite matrix to demonstrate friction angle similar to granite while simultaneously mitigating the dilation angle lower than granite.

4th Asia-Pacific Conference on Physical Modelling in Geotechnics (ACPMG2024)

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