LABORATORY INVESTIGATION OF WASTE FOUNDRY SAND FOR USE IN EMBANMKEMENT AND SUB-BASE LAYERS OF PAVEMENT

Abstract

T h i s p a pe r h i g hl i g h t s t h e b e n e f i c i a l u s e s o f W a s t e Fo u n d r y Sa n d ( W FS ) i n
p a v e m e n t l ay e r s . T h e t a r g e t w a s o n l y t he e m b a n km e n t a n d t h e s u b - b a s e l a y e r s o f t he
p a v e m e n t . . Annually, approximately 100 million tons of foundry sand are used by metal-casting industries for
production of various metal casting/bearing, making India the third largest. In addition India produces 5 lakh tons of
WFS annually. The disposal of Waste Foundry Sand is a major concern as a result it can be beneficially used as a
partial supplement to fine aggregates in pavement layers. The chemical and physical properties proved it be safe for
pavement use and also the mechanical results of cement stabilized foundry sand showed that its use improved the
compaction and compressive strength of soil, upto 50% replacement of fine aggregates in GSB layer with waste foundry
sand gave much improved results of CBR than with 0% replacement. Foundry sand was also found to be falling in the
category of well graded sandy soil.