GATE CE 2022: Transportation Engineering & Surveying Quiz #7

The bitumen is mixed with a volatile diluent to

The properties bitumen should possess to be used as a highway material are

(i) High temperature susceptibility

(ii) Good adhesive properties

(iii) High softening point

(iv) Sufficient flexibility

Statement 1: Higher the ductility of bituminous binder, more will be physical interlocking of aggregate – bitumen mixes.

Statement 2: The binder lacking ductility would crack and permit water to enter into the pavement.

If the percent volume of voids and percent volume of bitumen in a bituminous mix are 4.5 and 11.25 respectively, the percent volume filled with bitumen will be

The theoretical and mass density of a bituminous mix are 2.445 and 2.385 respectively. If the percentage of bitumen in the mix is 10.32% calculate the percentage voids in mineral aggregate.

In Marshall method of mix design the coarse aggregate, fine aggregate, filler and bitumen having specific gravity 2.65, 2.72, 2.68 and 1.10 are mixed in the relative proportion (% by weight) of 58, 32, 4.5 and 5.5 respectively. If the mass of mix in air and water are 1075 and 618 g respectively, calculate the percentage air voids in the mix.