1 Streets are crowned to 2 Select 3 alternative materials t

1. Streets are crowned to _______.

2. Select 3 alternative materials that can be utilized in asphalt concrete mixtures.

Solution

1. Answer is D) Promote drainage

We all know that to drain off the rain water from the surface of the road (in the transverse direction), the middle portion of the road is slightly raised with respect to the edges. This is also called as camber or cant or crown.

2. Answer - Three alternative materials that can be utilized in asphalt concrete mixtures are

E)Asphalt shingles - It is composed of 35% asphalt. It can be used in the granular base stabilization for layers patching materials for repairing pot holes, also in the design of hot mix asphalt etc. underlaying the pavement surface.

A)Crumb rubber - A crumb rubber which has been ground in to very small particles can be used as a asphalt modifier.

C)Glass - Glass materials are brittle and rich in silicon, so the key technical indexes of glass asphalt concrete are strength and resistance against damage. Fractional fine aggregate can be substituted with crushed glass material in asphalt concrete mixes.