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The Influence of Pet Fibers on the Properties of Fresh and Hardened Concrete N Shamskia There is a worldwide interest in using fibers of different types in concrete mixtures. In this regard, as the use of PET fibers has gradually increased during the last decade, this study aims to investigate the effects of PET fibers on the mechanical properties of hardened concrete and the workability of fresh concrete. To this end, different contents of PET fibers (PC= %0, %0.5, %1 and %1.5) are added to a concrete mixture and the workability of fresh concrete samples are measured by the slump tests. Furthermore, the load-displacement behavior of the concrete samples is investigated in flexural and compression samples. Results of this study reveal that PET fibers can noticeably change the energy absorption of concrete samples, especially in flexural specimens. منبع دانلود JSEG191348691400.pdf

Investigating the Distribution and Orientation of Steel Fiber Reinforced Concrete Original Article, B34 Zandi Y. Journal. Civil Eng. Urban. 2(5): 191-195. 2012. ABSTRACT:The distribution functions of fiber location variables were investigated that can be used to produce an analytic model to predict the mechanical properties of SFRC. Considering the effect of surrounding boundaries and distribution function, theoretical expressions were derived for the number of fibers per unit cross sectional area in SFRC. A comparison between empirical results and the theory were done to confirm the analytical results. Fibers are usually used in concrete to control cracking due to both plastic shrinkage and drying shrinkage. The amount of fibers added to a concrete mix is expressed as a percentage of the total volume of the composite (concrete and fibers), termed volume fraction (Vf). Vf typically ranges from 0.1 to 3%. Fibers with a non-circular cross section use an equivalent diameter for the calculation of aspect ratio. Keywords:steel fiber reinforced concrete; steel fibers; vibration, distribution function. منبع: [Hidden Content] دانلود: [Hidden Content],%20B%2034%20191-195.pdf JCEU, B 34 191-195.pdf