کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1456918 | 989232 | 2011 | 12 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Impact of time-dependant thermal expansion coefficient on the early-age volume changes in cement pastes Impact of time-dependant thermal expansion coefficient on the early-age volume changes in cement pastes](/preview/png/1456918.png)
Volume changes and time-dependent thermal expansion coefficient were determined at early stages and the measured total strain was separated into thermal strain and autogenous strain. Cement paste specimens were subjected to temperature histories that imitated hydration-induced temperature rise of the mass concrete. It was shown that the thermal expansion coefficient increased significantly with the development of hydration and became more conspicuous when the ground granulated blast furnace slag was added. The time-dependant increase of thermal expansion coefficient, due to self-desiccation, could result in considerable shrinkage strain at the end of the temperature history. The impact of the time-dependant increase of thermal expansion coefficient might be taken into account as one of the necessary factors in the crack control design from now and cannot even be neglected within the range of the water to binder ratio of this study, because the shrinkage originated in that effect sometimes exceed the autogenous shrinkage.
Journal: Cement and Concrete Research - Volume 41, Issue 4, April 2011, Pages 380–391