The Marshall test for bituminous mix design determines the optimum bitumen content by finding the content that gives:
Choose the correct answer
Maximum VMA (voids in mineral aggregate)
Maximum stability, while satisfying flow, air voids, and VFB criteria
Maximum density only
Minimum cost
Correct Answer
B. Maximum stability, while satisfying flow, air voids, and VFB criteria
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Marshall test evaluates stability (resistance to deformation) and flow at 60 deg C. Optimum bitumen content (OBC) is the average of bitumen contents giving max stability, max unit weight, and median air voids (4%). VFB should be 75-85%.
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