20-09-2016, 12:03 PM
1455340009-road2.pdf (Size: 133.41 KB / Downloads: 45)
A bituminous road is damaged fast in high rainfall areas due
to poor drainage conditions, while a gravel road becomes
dusty, causing safety and health problems due to a cloud of
dust raised by motorised traffic, which is increasing by leaps
and bounds. Problems of dust and wet weather damage to
roads can be easily overcome by constructing a thin flexible
concrete road using innovative technology at a cost lower
than that of a bituminous pavement for equal traffic. The
surfacing layer of concrete can be as thin as 50mm for a low
volume of traffic, to about 100mm for about 50 commercial
vehicles per day. The paper describes construction of a road
in the village Rakhalgaria, close to IIT Kharagpur, using the
new technology.
The existing road had a formation width of 3.50m and the
road crust consisted of murrum/laterite boulder of 100mm
average thickness. The CBR of the subgrade was found to be
5 and the region has an average annual rainfall of 1500 mm.
The daily traffic consisted of about 30 iron-rimmed bullock
carts, 3 to 5 trucks carrying building material, 20 three
wheelers, 30 motorcycles and 100 bicycles per day. The
village has a primary school and fairs are held twice a year
with plenty of commercial activities.
Formation width was widened to 5.5m and a carriageway
width of 3.75m was adopted. A camber of 3.0% over the
subbase was provided by compacting murrum over the
existing murrum surface. An edge restraint of brick on end
edge was provided on either side of the compacted