عنوان مقاله [English]
The use of roller compacted concrete (R.C.C) without conventional cover in important hydraulic structures is investigated through laboratory observation of abrasion phenomena sujected to high velocity flow and floating particles. The main parameters affecting abrasion and erosion resistance of R.C.C. studied in the present study include: "Mixed Hydraulic Mean Radius" (which collectively represents several different parameters such as shape, type of surface, fine and coarse aggregate ratio, mixture irregularity, and energy of compaction), water cement ratio, and age of R.C.C. samples. It should be noted that most references in this filed concentrate on conventional concrete abrasion with often soft surfaces. In the present study, however, research findings on abrasion-erosion resistance of R.C.C. and their applications in new investigations will be investigated using a new test device called "Evaluation of Concrete Resistance" designed by H. Bayat. The device works with several phase flows. Single and multivariate analyses of the results, graphs, and empirical relations are used to determine abrasion and erosion resistance in terms of the above parameters. It is expected that in future only one parameter, namely, the Mixture Hydraulic Mean Radius", will suffice for evaluating R.C.C. abrasion resistance.