ABSTRACT

T h e re su lts sh o w th a t as th e am o u n t o f b la s t m a te ria l in c reases, com p ressiv e s tre n g th o f th e sam ple d ecreases. In v estig a tio n in to th e se resu lts rev ea l th ree m ain fa c to rs th a t affec t th e s tren g th an d /o r se t tim e: 1 ) p a rtic le size (fíness o f m o d u lu s o f sp e n t A B M ran g ed fro m 2 .3 4 to 1 .27 w h e re a s fo r sand it is 2 .8 7 ) 2 ) n ew p a in t (p re se n t in sam ple 11-A 1-97 th u s in c reas in g V O C ’s) 3) h igh pain t c o n te n t (m o re rep lacem en t m o re p a in t m o re m eta l p re se n t p e r u n it w eigh t).