Question

The percent voids in mineral aggregate (VMA) and percent air voids $V_v$ in a compacted cylindrical bituminous mix specimen are 15 and 4.5 respectively. The percent voids filled with bitumen (VFB) for this specimen is :

• A. 54
• B. 30
• C. 24
• D. 70

Answer 1

The correct option is D 70


$VMA=\frac{V_v}{V}=15\%$
Percentage air void
$=\frac{V_v-V_b}{V}=4.5\%$
Let,
$V=100\text{units}$
$\Rightarrow V_v=15\text{units}$
$\Rightarrow (V_v-V_b)=4.5\text{units}$
Then,
$V_b=10.5\text{units}$
$VFB=\frac{V_b}{V_v}=\frac{10.5}{15}\times 100=70\%$