CONSTRUCTION PLANNING OF ROLLER COMPACTED CONCRETE DAM WITH SPECIAL REFERENCE TO JAMRANI PROJECT, U.P.

Abstract

Concrete dams, a remarkable contribution towards Water Resources Development still remain labour intensive and dis-continuous. The embankment dams, on the contrary have become more efficient due to the use of large and more effective plant and a better understanding of the materials being incorporated in them. Further, with the increasing size of dams as well as decreasing availability of ideal sites, there is a considerable reduction in construction' of concrete dams. The major aim to reduce the cost of concrete dam inspired the use of earth moving equipment for transporting, placing, spreading and compacting the concrete. This has been possible by roller compacted concrete. The technique introduced for the first time during construction of Alpa Gera dam in Italy in the year 1964 consists of placement of low cement no slump concrete in thin layers and compacting by vibratory rollers in a continuous series of operations without the interruption and discontinuty of conventional shuttered transverse joints. The roller compacted concrete can be placed as hearting or central core between up-stream and downstream facings provided either by conventional form work, slip formed method or precast block concrete. The method has proved to be economical in some cases even upto an extent of 50% over the conventional method depending upon the size of the dam.