STUDYING THE TOUGHNESS, STIFFNESS AND DUCTILITY INDEX OF CONCRETE SLAB RESTED ON WINKLER FOUNDATION REINFORCED WITH DIFFERENT SYNTHETIC TYPES OF FIBER MESHES

Mohammed Ali  Basheer; Sofyan Y.  Ahmed

doi:10.30572/2018/KJE/160424

Authors

Mohammed Ali Basheer MSc student/University of Mosul, college of engineering, Civil Dept
Sofyan Y. Ahmed Assi. Prof. PhD. /University of Mosul / college of engineering - Civil Dept

DOI:

https://doi.org/10.30572/2018/KJE/160424

Keywords:

Ductility, Toughness and Stiffness

Abstract

Concrete slabs of (800×800)mm and a thickness of )100(mm resting on Winkler support, for subgrade reaction of (0.028)N/mm³, and strengthened with different types of synthetic fiber meshes, that are fiberglass, polypropylene, carbon, geogrid, and waste rubber, are used to study the characteristics of toughness, stiffness and ductility index of these slabs incorporated with these meshes. The addition of these fibers increases the rigidity of slabs resting on the ground, to reduce the damage as minimum as possible, which keeps pace with the current development of using these materials. The experimental results show that the toughness and stiffness have been significantly improved in all the specimens strengthened with these meshes, especially for the specimens for carbon fiber mesh, where the increase was 187.0% and 33.7% respectively. The lowest increase percent in toughness of 12.9% in the case of strengthening by waste rubber, and the lowest increase percent in stiffness of 8.1% in the case of strengthening by polypropylene mesh While the specimen reinforced with geogrid showed a weakness in the ductility index (2.0), compared to the highest value for the models reinforced with carbon fibers of (3.3)

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