GATE 2016 CE (CE1) – Question 31
During a forensic investigation of pavement failure, an engineer reconstructed the graphs P, Q, R and S, using partial and damaged old reports. Theoretically plausible correct graphs according to the 'Marshall mixture design output' are
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Correct answer: (B) P, Q, S
Explanation
Marshall stability typically rises to a peak and then decreases as binder content increases, while flow generally increases. Air voids decrease as binder fills the available space, whereas voids filled with bitumen increase rather than decrease. Hence P,Q and S are correct and R is incorrect: **B**.