Importance of Earthwork
Earthwork is one of the major works involved in road construction. This process includes excavation, material removal, filling, compaction, and construction. Moisture content is controlled, and compaction is done according to standard design procedures. Normally, rock explosion at the road bed is not encouraged. While filling a depression to reach the road level, the original bed is flattened after the removal of the topsoil. The fill layer is distributed and compacted to the designed specifications. This procedure is repeated until the compaction desired is reached. The fill material should not contain organic elements, and possess a low index of plasticity. Fill material can include gravel and decomposed rocks of a particular size, but should not consist of huge clay lumps. Sand clay can be used. The area is considered to be adequately compacted when the roller movement does not create a noticeable deformation. The road surface finish is reliant on the economic aspects, and the estimated usage.
Bulldozers are some of the most important items of equipment used in road construction. Since a bulldozer is expensive, economic usage factors should be considered when using one. Bulldozers are extremely useful for road construction where it is possible to throw the waste excavated material on the road sides. Bulldozers may only be used if the slopes at the sides are not excessively steep. However, work on steep slopes can be accomplished by a bulldozer by using special techniques and expertise.
Construction of roads in challenging conditions is no more a difficult tasks because the binding agents and admixtures make it possible for the roads to last long and carry the heavy loads without cracking under tough environmental conditions. Use of recyclable materials for the construction of roads has added balance to the enviroment too.