ABSTRACT
The r e s u l t s which are presented i n TableA6a show that the concrete compressive strengths are reduced due to the inc r e a s e d w/c r a t i o s compared with ordinary concrete made with n a t u r a l sand. For concretes i n c l u d i n g sand-lime b r i c k rubble sand, the reduction i n compressive s t r e n g t h i s the lowest. Reduction of the amount of f i n e s had l i t t l e e f f e c t on compressive s t r e n g t h of the con c r e t e s . The e f f e c t of b r i c k rubble sands on concrete shrinkage i s shown i n F i g . 36 and 37. As could be expected, the shrinkage of mixes made with b r i c k rubble sands i s l a r g e r than shrinkage of concrete made with n a t u r a l sand. For concrete containing b r i c k and sand-lime b r i c k sand, the shrinkage i s reduced c o n s i d e r a b l y by reducing the proportion of f i n e s .
