ABSTRACT
The end product of a s i n g l e p l a n t f o r the preparation of rubble to be used i n b u i l d i n g c o n s t r u c t i o n may w e l l show considerable v a r i a t i o n s i n composition. T h i s was r e v e a l e d by the r e s u l t s of more recent i n v e s t i g a t i o n s (see Tables 3 and 4) made on e i g h t d i f f e r e n t i n s t a l l a t i o n s i n the Netherlands ( 4 ) . Although these r e s u l t s r e f e r to prepared rubble, they give i n d i c a t i o n s about the composition of the untreated o r i g i n a l rubble. Table 3 g i v e s the r e s u l t of v i s u a l examination showing d i f f e r e n c e s observed during one day's production run and Table 4 shows the range of v a r i a - t i o n f o r ten days taken a t random between 1980 and 1982. I t may be seen t h a t some p l a n t s show a preference for c e r t a i n types of b u i l d i n g m a t e r i a l s . I t appears a l s o that i n p l a n t s 1 to 5 there are c o n s i d e r a b l e amounts of a s p h a l t concrete rubble and on average about 20% by weight of mortar. Sand-lime b r i c k occurs only i n small amounts.
