Normally excavated earth from the same area shall be used for filling. It should be free from vegetation, boulders greater than 75 mm in any direction, clods exceeding 8 cm and deleterious materials.
The optimum moisture content at which clayee soil can be compacted for maximum density is experimentally found out at the laboratory. The soil suitable for use as fill material is laid in layers. Water is added, if required, to have the optimum moisture content. Rolling as specified is carried out Gith proper rolling equipment and giving the minimum number of passes. Sample is taken out from the fill and tested to have the required density.
Sand Filling
Sand shall be clean and free from dust, organic and foreign matter and of proper grading. It shall be done in a manner specified in 7.3.3 except that consolidation shall be done by flooding with water. The surface of the consolidated sand filling shall be dressed to the required slope.
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