By T. N. W. Akroyd (Auth.)
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Additional info for Concrete. Properties and Manufacture
Concr. , V o l . 1 3 , N o . 3 9 , C. & C. Α . , N o v . 1 9 6 1 . CARLSON, R . W . D r y i n g shrinkage of large concrete m e m b e r s . J. Amer. Concr. , 3 3 , 1 9 3 7 . EVANS, R . H . T h e p l a s t i c t h e o r i e s for t h e u l t i m a t e s t r e n g t h o f r e i n f o r c e d c o n c r e t e b e a m s . J. Instn. Civ. , HARPER, F . C . a n d BONNELL, D . G . R . concrete. JONES, R . Vol. 2 1 , Dec. 1943. 1 9 5 1 . T h e thermal expansion of N a t . Bldg. S t u d s . T e c h . P a p e r N o .
Vi^ville) Effect of cement and relative humidity on creep strain. p r o b a b l y n o t as i m p o r t a n t as c h e m i c a l composition. R a p i d h a r d e n i n g P o r t l a n d c e m e n t concrete m a y h a v e a r a t e a n d t o t a l creep twice t h a t of o r d i n a r y P o r t l a n d c e m e n t c o n c r e t e . L o w h e a t c e m e n t also creeps m o r e t h a n o r d i n a r y P o r t l a n d , a n d t h e creep is g r e a t e r for coarse c e m e n t (which is t h e reverse of t h e case for o r d i n a r y P o r t l a n d c e m e n t ) .
A p a r t from those d u e to s t r u c t u r a l m o v e m e n t , cracks a r e d u e to d r y i n g s h r i n k a g e . T h e p e r m e a b i l i t y decreases b u t t h e s h r i n k a g e increases as t h e richness of t h e c o n c r e t e increases. T o r e d u c e s h r i n k a g e , c o n c r e t e s h o u l d b e m a d e m o r e l e a n , a n d this increases t h e p e r m e a b i l i t y . T h e o p t i m u m r a t i o of a g g r e g a t e to c e m e n t for m i n i m u m c r a c k i n g w i t h m i n i m u m richness a p p e a r s to b e 6 : 1 , b u t this, of course, d e p e n d s u p o n t h e t y p e of a g g r e g a t e used.