Numerical and experimental adiabatic hydration curve determination
R. Springenschmid
Abstract
R. Springenschmid
Abstract
A b s t r a c t A d i a b a t i c h y d r a t i o n c u r v e s o f c o n c r e t e m i x e s a r e u s e d a s i n - p u t f o r c o m p u t e r p r o g r a m s u t i l i z e d f o r t h e c a l c u l a t i o n o f t h e t e m p e r a t u r e d i s t r i b u t i o n i n h a r d e n i n g c o n c r e t e . A t p r e - s e n t n o s t a n d a r d i s e d t e s t e q u i p m e n t h a s b e e n s p e c i f i e d w i t h w h i c h a d i a b a t i c c u r v e s s h o u l d b e d e t e r m i n e d . A c o m p a r i s o n o f t e s t r e s u l t s o b t a i n e d w i t h d i f f e r e n t a d i a b a t i c c a l o r i m e t e r s h a s r e v e a l e d a s u b s t a n t i a l s c a t t e r a n d h a s e v i d e n c e d t h e n e e d f o r a t h o r o u g h a n a l y s i s o f t h e c a u s e o f t h i s s c a t t e r . R e s u l t s o f s u c h a n a n a l y s i s a r e p r e s e n t e d i n t h i s p a p e r . P r o b l e m s e n c o u n t e r e d i n a d i a b a t i c t e s t i n g a r e d e a l t w i t h . A c o m p u t e r - b a s e d n u m e r i c a l m o d e l i s p r e s e n t e d , w i t h w h i c h h y - d r a t i o n c u r v e s c a n b e c a l c u l a t e d a s a f u n c t i o n o f t h e c l i n - k e r c o m p o s i t i o n o f t h e c e m e n t a n d t h e m i x c o m p o s i t i o n o f t h e c o n c r e t e . Keywords: Adiabatic Calorimetry, Heat of Hydration, Modelling of Heat of Hydration, Numerical Simulation.
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A b s t r a c t A d i a b a t i c h y d r a t i o n c u r v e s o f c o n c r e t e m i x e s a r e u s e d a s i n - p u t f o r c o m p u t e r p r o g r a m s u t i l i z e d f o r t h e c a l c u l a t i o n o f t h e t e m p e r a t u r e d i s t r i b u t i o n i n h a r d e n i n g c o n c r e t e . A t p r e - s e n t n o s t a n d a r d i s e d t e s t e q u i p m e n t h a s b e e n s p e c i f i e d w i t h w h i c h a d i a b a t i c c u r v e s s h o u l d b e d e t e r m i n e d . A c o m p a r i s o n o f t e s t r e s u l t s o b t a i n e d w i t h d i f f e r e n t a d i a b a t i c c a l o r i m e t e r s h a s r e v e a l e d a s u b s t a n t i a l s c a t t e r a n d h a s e v i d e n c e d t h e n e e d f o r a t h o r o u g h a n a l y s i s o f t h e c a u s e o f t h i s s c a t t e r . R e s u l t s o f s u c h a n a n a l y s i s a r e p r e s e n t e d i n t h i s p a p e r . P r o b l e m s e n c o u n t e r e d i n a d i a b a t i c t e s t i n g a r e d e a l t w i t h . A c o m p u t e r - b a s e d n u m e r i c a l m o d e l i s p r e s e n t e d , w i t h w h i c h h y - d r a t i o n c u r v e s c a n b e c a l c u l a t e d a s a f u n c t i o n o f t h e c l i n - k e r c o m p o s i t i o n o f t h e c e m e n t a n d t h e m i x c o m p o s i t i o n o f t h e c o n c r e t e . Keywords: Adiabatic Calorimetry, Heat of Hydration, Modelling of Heat of Hydration, Numerical Simulation.
Key concepts: Adiabatic process, Materials science, Thermodynamics, Physics