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Sunday 23 December 2012

Earth roads are constructed as detailed below :-
Material required :- The materials required for the construction of an ordinary earth road are natural soil, originally availableat site, a suitable stabilizer, if required. The ideal composition of soil which is recommended for construction earth roads.


Method of construction of an ordinary earth road :- The construction work of an ordinary earth road is completed in the following steps ;-
1. Preparing the subgrade :- The subgrade is prepared and the surface is brought to the required camber and gradient.
2. Rolling an watering :- The surface is rolle properly and well wetted with water.
3. Spreading the soil :- after watering, a layer of graded soil, about 10 cm thick is evenly spread.
4. Rolling :- the layer of soil is rolled at optimum moisture moisture content ( OMC ) with a suitable roller and finally finished with a light roller.
The type of roller for compaction is decided based on soil type, desired amount of compaction and availability of equipment. Atleast 95 per cent of dry density of its light compaction is considered desirable.
Note :- Sometimes, a second layer (about 10 cm thick ) is also spread and rolled properly to act as wearing course.
5. Checking :-The camber of the finished surface is checked an corrected, if necessary.
6. Curing :- The rolled surface is watered for four or five days for curing. No traffic should be allowed to pass over the road surface during this period.
7. Opening to traffic :- After curing, the traffic is allowed to pass but the surface is sprinkled over with water for a period of 10 to 1 days.
Method of construction of a stabilized earth road :- construction work of a stabilized earth road is completed  in steps as described in case of ordinary earth road. for constructing  a stabilized earth road, the subgrade is prepared to the required camber and gradient. Then the base course is prepared by any suitable method of soil stabilized soil ( about 10 cm thick ) is spread over the base course and rolled properly. The surface is then cured and opened to traffic.

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