Abstract—This study compares the mix properties such as Marshall Stability, flow and indirect tensile strength obtained on 100 mm and 150 mm diameter specimens. Both Marshall and Modified Marshall method of mix design were used to compact the specimens of these two sizes. The maximum aggregate size used here is 37.5 mm. In the present study, the adopted aggregate gradation is as per MoRT and H (IV revision) specification. The binder used is Crumb Rubber Modified bitumen (CRMB-55). The mix design is conducted as per Marshall Method of mix design for 100 mm diameter specimen and MS-2 guidelines are used for 150 mm diameter specimen (Modified Marshall Method). It was observed that the Modified Marshall Method satisfies the mix properties such as Marshall Stability, flow and indirect tensile strength and can be used for testing the large stone aggregate mixes. Indirect tensile tests were conducted on the Marshall and Modified Marshall specimens of Crumb Rubber Dense Graded Bituminous Macadam Grading-1 mixes varying stress levels at 10%, 15%, 20%, 25% and 30% respectively. Laboratory studies on the behavior of Marshall and Modified Marshall specimens were carried out in terms of optimum bitumen content, Indirect Tensile Strength.
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