GATE 2025 CE (CE1) – Question 65
During determination of the bulk specific gravity of compacted bituminous specimen, the mass in air of the specimen is 1260 g and volume is 525 cm$^3$. The density of water is 1.0 g/cm$^3$. The theoretical maximum specific gravity of mix is 2.510.
The percentage air voids in the compacted specimen is ____________________ (*rounded off to 2 decimal places*).
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Correct answer: 4.36 to 4.40
Explanation
The bulk specific gravity is $G_{mb} = \frac{1260/525}{1.0} = 2.400$. The air voids are $V_a = \frac{G_{mm} - G_{mb}}{G_{mm}} \times 100 = \frac{2.510 - 2.400}{2.510} \times 100 = 4.38\ \%$.