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  Mehmet Akif Yilmaz, Mehmet Zubeyir Guney, Nuray Uzun, Hasan Emre Kivanc, Ebubekir Sonmez, Muhammed Enes Aydin
  Challenge Journal of Perioperative Medicine (2026) 4(1) 21-31
  Background: Postoperative acute kidney injury is a frequent complication after cardiac surgery performed with cardiopulmonary bypass and is closely associated with increased mortality. This study aimed to evaluate the predictive value of preoperative renal fun...
• Influence of casting delay on concrete compressive strength
  Md. Aminul Islam, Md. Mahabub Rahman, Md. Jakiul Alam Chy
  Challenge Journal of Concrete Research Letters (2026) 17(2) 82-93
  This research aims to evaluate the effect of evaporation and casting delay (delaying in pouring concrete after mixing, up to 120 minutes) on the concrete compressive strength (CCS) after 7, 14, and 28 days. To examine this, Portland Composite Cement (PCC) and ...
• Influence of the distance between vertical cylinders positioned in a row on the wind load on them
  Lyubomir A. Zdravkov
  Challenge Journal of Structural Mechanics (2024) 10(3) 101-108
  The silos and vertical cylindrical tanks of small volumes are often built in batteries, at short distances between them. As a result of their close location, the wind load on them increases. In the European standard EN 1991-1-4:2005+A1:2010 exists a methodolog...
• Calcium aluminate cement based high early strength engineered cementitious composites with recycled artificial flaws
  Ahmed Latif Kadhim, Süleyman Bahadır Keskin
  Challenge Journal of Concrete Research Letters (2024) 15(4) 120-133
  Engineered Cementitious Composites (ECC) is an ideal repair material due to its high durability and ductility. However, providing ECC with high early strength is challenging since strength and ductility, which are key to crack-free repair, are also interdepend...
• Wind loads on girder bridges
  Lyubomir A. Zdravkov
  Challenge Journal of Structural Mechanics (2022) 8(1) 9-16
  Bridges are facilities that are in exploitation outdoor. Often the wind is the leading horizontal force in the transverse direction. Therefore the bridges have received the due attention in the standards for wind loading. Unfortunately, in all available standa...