Question

If aggregate size of 50-40 mm is to be tested for determining the proportion of elongated aggregates, the slot length of the gauge should be

• A. 45 mm
• B. 53 mm
• C. 81 mm
• D. 90 mm

Answer 1

The correct option is C 81 mm

Slot length of guage
$=1.8\times \left(Meansizeofaggregate\right)$

$=1.8\times \frac{50+40}{2}=81mm$