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Comparison of the Performance of Macro-Polymeric Fibers and Steel Fibers in Controlling Drying Shrinkage Cracks of Concrete

Alireza. Bagheri, Armin. Jamali, Morteza. Gorgani-Firoozjah, and Hamed. Zanganeh
K. N. Toosi University of Technology/Civil Engineering Department, Tehran, Iran
Abstract—When concrete element is exposed to the environment, it undergoes volumetric contraction due to the drying shrinkage, which when restrained can lead to cracking. Crack width is controlled by the ability of fibers in transmission of stress across the crack opening. In this study the effect of Macro polymeric fibers in controlling drying shrinkage cracking of concrete was investigated and compared with that of steel fibers. The results of restrained ring tests show that at low and medium rate of utilization (0.25 and 0.5%) the effect of macro synthetic fibers are similar to steel fibers. However, at a higher dosage of 1%, steel fibers clearly outperform the polymeric fibers. The shape of macro polymeric fibers (multi-strand or single-strand) was not found to significantly affect their performance. 

Index Terms—concrete, drying shrinkage, macro polymeric fiber, steel fiber, restrained ring

Cite: Alireza Bagheri, Armin. Jamali Morteza. Gorgani-Firoozjah, and Hamed Zanganeh, "Comparison of the Performance of Macro-Polymeric Fibers and Steel Fibers in Controlling Drying Shrinkage Cracks of Concrete," International Journal of Structural and Civil Engineering Research, Vol. 7, No. 4, pp. 302-308, November 2018. doi: 10.18178/ijscer.7.4.302-308
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