Goodine, Lloyd2023-06-072023-06-071990https://unbscholar.lib.unb.ca/handle/1882/35102The m i c r o s t r u c t u r e of f o u r types o f manufactured aggregates were s t u d i e d using a scanning e l e c t r o n microscope and the r e s u l t s of t h i s work were used t o p r o v i d e an i n s i g ht i n t o the d i m e n s i o n a l s t a b i l i t y of prisms made o f these aggregates. The commercial names o f t h e f o u r types of aggregates are S o l i t e , A a r d e l i t e , Poraver and L y t a g . The dimensional s t a b i l i t y as determined from d r y i n g shrinkage t e s t s (ASTM C157, C331) v a r i e d w i d e l y between t h e f o u r types o f aggregate. The one w i t h the g r e a t e s t shrinkage was A a r d e l i t e and t h e one w i t h the l e a s t was S o l i t e . The r e l a t i o n s h i p of t h e s h r i n k a g e t o t h e p o r o s i t y of t h e aggregate i s i m p o r t a n t . The p o r o s i t y ranges from t h e l i g h t e r expanded glass ( w i t h i n t e r c o n n e c t e d pores) i n t h e case of Poraver t o expanded shale produced by t h e r o t a r y k i l n method t h a t has e s s e n t i a l l y n o n i n t e r c o n n e c t e d pores i n t h e case of S o l i t e . I t i s t h e n a t u r e o f how p o r o s i t y i s a c h i e v e d r a t h er than t h e degree o f p o r o s i t y t h a t i s i m p o r t a n t i n terms of dimensional s t a b i l i t y.electronicen-CAhttp://purl.org/coar/access_right/c_16ecsenior reportBremner, T.W., BremnerEngineering