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    Investigation of the Effect of Reinforcement Type on the Flexural Performance of Slab Tracks
    (Asce-Amer Soc Civil Engineers, 2023) Durgun, Yavuz; Gullu, Ahmet; Calim, Furkan; Ozden, Bayezid; Ozcan, Ali; Olcer, Beyazit; Senol, Erkan
    This paper presents the results of a comprehensive experimental study on the flexural performance of ballastless discrete precast slab tracks with two alternative reinforcement types. These are the precast slab tracks produced using ordinary reinforcement [nonpost-tensioned (NPT)] and the precast slab tracks produced using post-tensioned (PT) reinforcement. The study aims to compare the flexural performances of NPT- and PT-type slab tracks using three-point bending tests, even though they continuously sit on the ground with different rigidities in real-life applications. The tests performed on four full-scale slab tracks in the longitudinal and transversal directions resulted in the first cracking and the ultimate loads were greater in PT specimens. Also, the maximum crack widths and residual displacements of PT specimens were smaller. Although the aforementioned performance parameters of NPT-type slab tracks are relatively behind those of PT-type slab tracks, their overall response is still acceptable, with the advantages of easier production and lower cost.
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    Rapid and Easily Applicable Procedure for Full-Scale Laboratory Tests of Ballastless Slab Tracks
    (Asce-Amer Soc Civil Engineers, 2021) Gullu, Ahmet; Ozden, Bayezid; Olcer, Beyazit; Ozcan, Ali Ihsan; Binbir, Ergun; Durgun, Yavuz; Saruhan, Hakan
    Increasing demand for high speed railway lines necessitates reducing construction and maintenance costs. Accordingly, RC slab tracks are preferred due to their advantages such as being almost maintenance free and supplying uniform support conditions. However, new testing procedures are required for the performance evaluation of the slab tracks to identify possible failure modes which may not be observed in numerical analyses. Although there are some procedures in the literature, there still is no consensus on loading intensity, shape, frequency, or number of cycles. A testing procedure that greatly decreases experimental costs was adopted for the design approval tests of precast RC slab tracks. The procedure was evaluated experimentally through full-scale laboratory tests of intact and intentionally damaged specimens. The study demonstrated that the proposed testing procedure reduces experimental costs and identifies the mechanical properties of slab tracks.