What is the function of a sand layer underlying paving slab/interlocking blocks?

Question added by Mohamed Galal Hussein Ahmed Mohamed , Technical Mnager , Fast Building Contracting Co.
Date Posted: 2015/02/24

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by Mohammed Abul Mansur , General Manager , Sanmar Properties Limited

As an improved sub-grade layer and sand cushioning to relieve stress to the sub -grade layer.

by kevil Vavaiya , Civil Engineer , ASCO Consulting Engineers

mainly two function of sand layer underlying paving slab/interlocking block:

1) Provide level/flat surface for the paving slab/interlocking block

2) protect sub base layer against bad outside weather conditon

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