Compaction Test Procedure
Compaction - Soil compaction may be defined as the process of increasing the density of a soil by (1 ) expelling air from the pores, (2) decreasing thickness of water films thereby increasing cohesion, and (3) increasing mechanical bond, or interlocking, of soil particles. This is accomplished by vibratory rolling, static rolling, static loading, and tamping.
Compaction Test Procedure -The general procedure is to specify the size, weight, height of drop and number of blows to be delivered by a tamper to a confined sample, and then to measure the resulting density both wet and dry. The process is repeated, varying the water content, until the highest density is recorded for the method. The moisture content of the wet sample corresponding to the highest density of the dry sample is the optimum. Some special variations in method may exist but the most common prescribed is the AASHO Modified.Coral - The solid secretion of coral polyps, composed almost wholly of calcium carbonate, which forms reefs and tree-like and globular masses.
Conglomerate - An aggregate of rounded and waterworn pebbles and bowlders cemented together into a coherent rock. Deposited by streams or waves, generally with some sorting and stratification. Compare Breccia.
Conglomerate is a hardened, generally cemented gravel, and like sand, silt and clay, has been formed by the breaking down of older rocks and by later redisposition.
Commonly it is found intercepted with layers of sandstone. It also occurs at the base of many Pennsylvanian formations.
Conglomerate and gravel are used in making concrete, in surfacing roads and as railroad ballast.