Compound walls are nowadays preferred to be of unplastered concrete blockwork. The construction is cheap and no maintenance is needed. There are many variations in the construction of these walls. The convenient method is to install under-reamed or cast-in-situ piles at stipulated intervals (of 3–4 m) with grade beam on top of the piles and the blockwork built on top of the grade beams.
Vertical reinforcements are provided in the hollow blocks at regular intervals from the piles. This provision strengthens the wall along its length giving lateral resistance to wing loads or earth pressure. The top of these walls are finished with a coping cast in a channel-shaped block on top (Varghese, 2012).
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