Compaction Moulds Soil Compaction Many civil engineering projects

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Compaction Moulds

Compaction Moulds

Soil Compaction • Many civil engineering projects use soils as fill material, with soil

Soil Compaction • Many civil engineering projects use soils as fill material, with soil normally being compacted to a dense state to ensure that it has the optimum properties. • Compaction on site is generally achieved by mechanical means such as rolling, ramming or vibrating. • Soil used as fill: v To refill an excavation or void v To provide made-up ground to support a structure v As a sub-base for a road, railway or airfield runway v As a structure; e. g. an earth dam

Applications of Compaction Improvement by compaction Ø Higher stability Ø Lower compressibilty Ø Lower

Applications of Compaction Improvement by compaction Ø Higher stability Ø Lower compressibilty Ø Lower permeability Ø Lower frost susceptibility Effect on mass of fill Ø Greater stability Ø Less settlement Ø Less deformation Ø Less water absorption Ø Less risk of frost heave Freezing

Theory of Compaction is the process of densification of soil by reducing air voids.

Theory of Compaction is the process of densification of soil by reducing air voids. The degree of compaction of a given soil is measured in terms of its dry density. The dry density is maximum at the optimum water content. A curve is drawn between the water content and the dry density to obtain the maximum dry density and the optimum water content. Dry density = M/V 1+w

Compaction curve Compaction Curve

Compaction curve Compaction Curve

Compaction Mould Collar Mould Base plate Rammer

Compaction Mould Collar Mould Base plate Rammer

Manual compacting Automatic compactors

Manual compacting Automatic compactors

Procedure Repeat 5 times Add H 2 O Fill with sand to 1/5 level

Procedure Repeat 5 times Add H 2 O Fill with sand to 1/5 level H 2 O Compact by dropping rammer 25 times, & measure level Dry soil in oven to determine moisture content