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Naturally Occurring Cyclopentadienes and Cyclopentadienyl Anions

Abstract

The history of cyclopentdienyl complexes (or cyclopentadienyl salts) has been spanning already for more then 70 years and they have been always considered as typical representatives of truly manmade molecules. Although compounds possessing the cyclopentadiene scaffold have been isolated and characterized, those possessing the cyclopentadienyl anion have been avoiding discovery for a long period of time. Nonetheless, since the isolation of juglorubin in 1993, the family of naturally occurring compounds possessing the cyclopentadienyl anion is steadily growing. This review aims to give an overview of the current state of the art in this area.

article Article; Book Chapter

date_range 2024

language English

link Link of the paper

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Hajicek Josef

Necas David

Kotora Martin

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Cyclopentadiene

Cyclopentadienyl anion

Natural compounds

Synthesis

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Effect of corrosion on flexural strength of reinforced concrete beams with polypropylene fibers

Abstract

An experimental study was performed to investigate the effects of polypropylene fibers on uncorroded and corroded reinforced concrete beams. Three different volume fractions of polypropylene fibers having 0, 0.5, and 1.5%, were tested at four corrosion levels of 0% and approximately 5, 7, and 9%. A full scale of an accelerated corrosion pool was used for the accelerated corrosion process. Reinforced concrete beams were used for an under monotonic bending test. The contribution of the actual corrosion levels of transverse and longitudinal reinforcement bars to the total corrosion levels were obtained from reinforcement bars fully extracted from concrete. Flexural strength, bond-slip, and moment-curvature relationships were examined for uncorroded and corroded reinforced concrete beams. A new model was developed to predict the flexural strength of corroded reinforced concrete beams. The proposed model for predicting the residual flexural strength of corroded beams was compared with test data published in previous studies. Furthermore, a novel model is presented for improved predictions between the actual and theoretically estimated corrosion mass losses, based on Faraday’s law, with the aid of fully extracted reinforcement bars. The model used to predict the flexural strength of corroded reinforced concrete beams with large sizes demonstrated good agreement with current and previously published literature data. In the case of corroded beams comprising differing amounts of polypropylene fibers, the performance of the corroded beams was limited by a fiber volume fraction of 1.5% at low corrosion levels.

article Article

date_range 2018

language English

link Link of the paper

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