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Internal relative humidity distribution in high-performance cement paste due to moisture diffusion and self-desiccation
AbstractThis investigation was carried out to study internal relative humidity (IRH) distribution of cement paste made with different water/cement ratios (w/c) and mineral admixtures in isothermal drying conditions. IRH changes in cement paste resulting from self-desiccation and moisture diffusion, respectively, at different ages were studied. The change laws of IRH in cement paste resulting from combining moisture diffusion with self-desiccation were discussed. The results indicate that IRH reduction of cement paste with w/c higher than 0.4 is mainly affected by moisture diffusion. However, IRH reduction of cement paste with w/c no higher than 0.4 is controlled by both moisture diffusion and self-desiccation. With the decrease of w/c, IRH reduction of cement paste resulting from self-desiccation increases, and IRH reduction resulting from moisture diffusion decreases at a given age. IRH decrement of cement paste incorporated with silica fume and ground blast-furnace slag is higher than that of control paste. w/c and the distance to the exposed surface play a significant role in IRH change resulting from moisture diffusion in isothermal drying condition. Change laws of IRH in cement paste with silica fume due to moisture diffusion considering self-desiccation are different from those in cement paste without silica fume.
Internal relative humidity distribution in high-performance cement paste due to moisture diffusion and self-desiccation
AbstractThis investigation was carried out to study internal relative humidity (IRH) distribution of cement paste made with different water/cement ratios (w/c) and mineral admixtures in isothermal drying conditions. IRH changes in cement paste resulting from self-desiccation and moisture diffusion, respectively, at different ages were studied. The change laws of IRH in cement paste resulting from combining moisture diffusion with self-desiccation were discussed. The results indicate that IRH reduction of cement paste with w/c higher than 0.4 is mainly affected by moisture diffusion. However, IRH reduction of cement paste with w/c no higher than 0.4 is controlled by both moisture diffusion and self-desiccation. With the decrease of w/c, IRH reduction of cement paste resulting from self-desiccation increases, and IRH reduction resulting from moisture diffusion decreases at a given age. IRH decrement of cement paste incorporated with silica fume and ground blast-furnace slag is higher than that of control paste. w/c and the distance to the exposed surface play a significant role in IRH change resulting from moisture diffusion in isothermal drying condition. Change laws of IRH in cement paste with silica fume due to moisture diffusion considering self-desiccation are different from those in cement paste without silica fume.
Internal relative humidity distribution in high-performance cement paste due to moisture diffusion and self-desiccation
Jiang, Zhengwu (author) / Sun, Zhenping (author) / Wang, Peiming (author)
Cement and Concrete Research ; 36 ; 320-325
2005-07-17
6 pages
Article (Journal)
Electronic Resource
English
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