Introduction

I n formulating the aim, i t became obvious that a subd i v i s i o n i n t o at l e a s t two d i s t i n c t groups of b u i l d i n g m a t e r i a l s would be necessary i n order to ensure an optimum use of b u i l d i n g rubble. Concrete rubble r e s u l t i n g from the breaking up of roads and other c i v i l engineering concrete c o n s t r u c t i o n works contains few other b u i l d i n g m a t e r i a l s than concrete. But rubble from b u i l d i n g s t r u c t u r e s contains g e n e r a l l y many other types of m a t e r i a l s such as masonry. The p r o p e r t i e s of concrete rubble and mixed masonry rubble are so d i f f e r e n t t h a t they need to be t r e a t e d s e p a r a t e l y . For t h i s reason i t has been necessary to present separate r e p o r t s on aggregates based on r e c y c l e d concrete rubble and on r e c y c l e d masonry rubble. Part One of t h i s volume contains the report on aggregates based on r e c y c l e d concrete rubble. The present report on crushed masonry and r e c y c l e d concrete made with crushed masonry as aggregate draws l a r g e l y on knowledge acquired on the use of rubble from b u i l d i n g s destroyed i n the Second World War. More recent r e s e a r c h (4, 42, 40, 50) published i n the Netherlands has contributed s u b s t a n t i a l l y to the extending and updating of t h i s p art of the r e p o r t . The r e a d e r i s f r e q u e n t l y r e f e r r e d to l i t e r a t u r e r e f e r e n c e (4) which summarizes the r e s u l t s of a major study of mixed demolition rubble which was made i n the Netherlands. A b r i e f summary of the p r o p e r t i e s of the raw m a t e r i a l s used i n t h i s study and the r e s u l t s obtained on corresponding concretes are presented i n Appendix A.