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    A comparative evaluation of indirect methods to estimate the compressive strength of rocks
    (SPRINGER WIEN, 2005) Fener, M; Kahraman, S; Bilgil, A; Gunaydin, O
    [Abstract Not Available]
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    A numerical approach to determine viscosity-dependent segregation in fresh concrete
    (ELSEVIER SCIENCE INC, 2005) Bilgil, A; Ozturk, B; Bilgil, H
    In this study, the mechanism of segregation during the filling of fresh concrete into formwork is numerically investigated. A mathematical model, which considers fresh concrete as a non-Newtonian fluid, is developed. The aggregates are considered as Lagrangian particles whose trajectories determine segregation. Aggregate segregation is partially affected due to concrete viscosity. The study presented here will show the relationship between viscosity and segregation during fill of fresh concrete in formwork. The relationship in between aggregate segregation and viscosity during the fill of fresh concrete for both MC concrete mixture and MCS concrete mixture is investigated. MCS concrete mixture includes superplasticizers for the same composition of MC. Cylindrical formwork (30 cm by 150 cm) is employed. It is found that MC concrete mixture has an aggregate segregation level of 50%, while it reduces to a level of 20% for MCS concrete mixture. The use of superplasticizer reduces aggregate segregation. (C) 2004 Elsevier Inc. All rights reserved.
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    Correlation and distribution of shear stress for turbulent flow in a smooth rectangular open channel
    (INT ASSN HYDRAULIC RESEARCH, 2005) Bilgil, A
    Calculation of shear stresses in open channel flow is very important in civil engineering applications such as structural design, determination of velocity distribution and sediment transport. It is argued in literature that the velocity distribution equations for pipe flow may be used in open-channel flow analysis. However, due to irregular boundary sheer stress, this claim seems to be unreasonable and the irregularities should be taken into consideration. In this study, wall shear stresses for turbulent flow in rectangular open channel are investigated. Using mean velocity measurements and assuming validity of the logarithmic velocity distribution perpendicular to wetted perimeter, dimensionless shear stresses in the unified velocity distribution are determined. A semi-theoretical method is applied for the solutions of non-linear equations. A shear stress distribution equation is proposed to calculate irregular boundary shear stresses on the wall and bed in smooth rectangular channels.