کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1456584 | 989211 | 2012 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Patterns of gravity induced aggregate migration during casting of fluid concretes Patterns of gravity induced aggregate migration during casting of fluid concretes](/preview/png/1456584.png)
In this paper, aggregate migration patterns during fluid concrete castings are studied through experiments, dimensionless approach and numerical modeling. The experimental results obtained on two beams show that gravity induced migration is primarily affecting the coarsest aggregates resulting in a decrease of coarse aggregates volume fraction with the horizontal distance from the pouring point and in a puzzling vertical multi-layer structure. The origin of this multi layer structure is discussed and analyzed with the help of numerical simulations of free surface flow. Our results suggest that it finds its origin in the non Newtonian nature of fresh concrete and that increasing casting rate shall decrease the magnitude of gravity induced particle migration.
Journal: Cement and Concrete Research - Volume 42, Issue 12, December 2012, Pages 1571–1578