أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
As an improved sub-grade layer and sand cushioning to relieve stress to the sub -grade layer.
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
