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Download Concrete. Properties and Manufacture by T. N. W. Akroyd (Auth.) PDF

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By T. N. W. Akroyd (Auth.)

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120 \A 0 16>0 180 20 Ib/ft3 Variation of thermal conductivity with density. Thermal Conductivity T h e r m a l c o n d u c t i v i t y is a m e a s u r e of t h e r a t e of h e a t transfer. I t is i m p o r t a n t i n t h r e e s i t u a t i o n s : w h e n considering t h e dissipa­ tion of h e a t from a massive c o n c r e t e s t r u c t u r e , w h e n c o n s i d e r i n g t h e h e a t - r e t a i n i n g p r o p e r t i e s of c o n c r e t e walls, a n d also in t h e alHed p r o b l e m of m o i s t u r e c o n d e n s a t i o n or sweating.

H y d r a t i o n of t h e c e m e n t p r o d u c e s a gel w h i c h t e n d s to fill t h e w a t e r voids a n d to decrease t h e p e r m e a b i l i t y , a l t h o u g h t h e voids a r e n e v e r c o m p l e t e l y e l i m i n a t e d . I n c o m p l e t e c u r i n g or allowing t h e c o n c r e t e to d r y o u t d u r i n g h y d r a t i o n increases t h e porosity, so t h a t c o m p l e t e a n d t h o r o u g h c u r i n g is necessary to ensure low p e r m e a b i l i t y . Factors Affecting Permeability.

13). N o w c o n c r e t e dries o u t i n d e p t h only b y a b o u t 3 in. i n 1 m o n t h (2 ft i n 10 years) w h e n exposed to d r y air, so t h a t it THE PROPERTIES OF 29 CONCRETE Depth below surface of mass concrete 6 8 10 12 14 16 18 20 22 8 10 12 14 16 18 20 22 24 24 Number of months exposure of slabs exposed on both faces in relative humidity of 5 0 % Fig. 13. 26 26 28 30 32 28 30 32 ( B a s e d on Carlson) Rates of drying of concrete. is doubtful w h e t h e r t h e i n t e r i o r of a c o n c r e t e mass ever dries o u t in t h e life of t h e concrete, for u n d e r c o n s t a n t d r y i n g con­ ditions t h e m o i s t u r e g r a d i e n t t h r o u g h t h e concrete, w h i c h w a s steep a t t h e start of t h e d r y i n g process, finally b e c o m e s v e r y flat a n d a m o i s t u r e e q u i l i b r i u m w i t h t h e s u r r o u n d i n g a t m o s p h e r e is a t t a i n e d .

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