LAND TYPE AND APPROPRIATE FOUNDATION

LAND TYPE AND APPROPRIATE FOUNDATION

When a parcel of land is acquired the texture of the land determines the kind of foundation that is suitable.

If you are building on a water logged plot, your foundation is likely to be raft foundation which shoots out of the ground instead of the strip foundation where the contractor digs into the earth. However, a dry land needs no raft foundation as sand filling would be appropriate.

In addition, to ensure that the site is well drained the raft should be well above the road level (this is mostly due to drainage purpose and easy flow) meaning the compound has to be filled with sand. This leads to the appropriate types of material that can be used to fill the site namely; the laterite earth filling and sand filling.

LATERITE EARTH FILLING

Laterite is a soil and rock type rich in iron and aluminium, and is commonly considered to have formed in hot and wet tropical areas. Nearly all laterites are of rusty-red coloration, because of high iron oxide content. They develop by intensive and long-lasting weathering of the underlying parent rock.

This reddish sand is usually transported from the Shagamu axis.

Laterite

House built with laterite

SAND FILLING

The composition of sand varies, depending on the local rock sources and conditions, but the most common constituent of sand in inland continental settings and non-tropical coastal settings is silica (silicon dioxide, or SiO₂), usually in the form of quartz. The second most common type of sand is calcium carbonate, for example aragonite, which has mostly been created, over the past half billion years, by various forms of life, like coral and shellfish. 

Sand filling as the name implies is the filling of land to ensure better and sound foundation for onward erection of structures for individual of corporate use.

Sharp sand is mostly pumped from the lagoon bed.

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