ABSTRACT
Abstract In th e v a r i o u s c o u n t r i e s i n Europ e t h e r e ar e l a r g e number s of t e s t method s f o r assess in g th e d u r a b i l i t y o f a conc re t e w i t h r e spec t t o i t s f r eeze - tha w r e s i s t a n c e . I n o rde r t o i n v e s t i g a t e th e s u i t a b i l i t y an d r e p r o d u c i b i l i t y o f d i f f e r e n t n a t i o n a l t e s t method s th e CE N w o r k i ng grou p T C 51/W G 12/TG 4 "Freeze-thaw Res i s tance " decide d t o c a r r y ou t a Europea n Round Robi n t e s t . Thre e o f th e mor e f r e q u e n t l y use d method s - th e Scandinav ia n s la b method , th e Germa n cub e metho d an d the CDF-tes t - wer e s e l e c t e d f o r th e Roun d Robi n t e s t . Wi t h a l l t h r e e o f th e method s use d i t wa s p o s s i b l e t o d i f f e r e n - t i a t e betwee n a conc re t e w i t h h ig h f r e e z e - t h a w r e s i s t a n c e w i t h d e - i c i n g s a l t an d a conc re t e w i t h inadequat e r e s i s t a n - ce. Whi l e t e s t i n g w i t h o u t d e - i c i n g s a l t i t wa s somewha t b e t - t e r t o d i f f e r e n t i a t e betwee n th e conc re t e s w i t h th e cub e an d CDF method s tha n w i t h th e s la b method . A l l t h r e e method s have t o b e mad e mor e p r e c i s e i n o rde r t o reduc e th e compara - t i v e v a r i a t i o n s .
