Consider the Marshall method of mix design for bituminous mix. With the increase in bitumen content, which of the following statements is/are TRUE?

the Stability decreases initially and then increases
the Flow increases monotonically
the air voids (VA) increases initially and then decreases
the voids filled with bitumen (VFB) increases monotonically

Correct answer: the voids filled with bitumen (VFB) increases monotonically

Solution

As bitumen content increases, the amount of voids filled with bitumen (VFB) also increases consistently, leading to better binding and stability of the mix. This relationship is direct and does not exhibit fluctuations, making it a reliable trend in mix design.

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