ABSTRACT
The Marshall mix design procedure has been e x t e n s i v e l y accepted i n t e r n a t i o n a l l y . The f a l l a c y of t h i s and other design procedures i s t h e i r dependency upon the proper s e l e c t i o n and blending of aggregates f o r the mix. This s e l e c t i o n i s often dependent upon l o c a l experience and the use of gradation s p e c i f i c a t i o n s t h a t have evolved r a t h e r than being based upon a d e f i n i t i v e t e s t i n g procedure. Con sequently, the Marshall method only provides a means of s e l e c t i n g the design asphalt content. Reliance on Marshall s t a b i l i t y c r i t e r i a t o prevent pavement r u t t i n g has been shown to be u n r e l i a b l e . S i m i l a r l y , Hveem stabilometer values do not always i n d i c a t e the r e s i s t a n c e of the mixture to p l a s t i c deformation.
