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A model to simulate the contribution of fibre reinforcement for the punching re...

In this paper analytical formulations are developed for the prediction of the punching resistance of flat slabs 17 of steel fibre reinforced concrete (SFRC) flexurally reinforced with steel bars. By performing statistical 18 analysis with a database that collects experimental results on the characterization of the post-cracking 19 behaviour of SFRC, equations are determined for the evaluation of the residual fl...

A model for the prediction of the punching resistance of steel fibre reinforced...

With the aim of contributing for the development of design guidelines capable of predicting with high accuracy the punching resistance of steel fibre reinforced concrete (SFRC) flat slabs, a proposal is presented in the present paper and its predictive performance is assessed by using a database that collects the experimental results from 154 punching tests. The theoretical fundaments of this proposal are based...

DNA damage in fish (Anguilla anguilla) exposed to a glyphosate-based herbicide ...

The predictive performance of design models for the punching resistance of SFRC...

In the recent years steel fibre reinforced concrete (SFRC), in a volume percentage between 0.75 and 1.25, is being proposed to build slabs supported on piles and slabs supported on columns, where the unique conventional reinforcement is composed of some steel bars in the alignments of the columns/piles, designated as anti-progressive collapse bars. Punching resistance, however, can be a concern in this str...

Avaliação do cálculo da resistência ao punçoamento centrado de lajes fungiforme...

Desde 1979 que as fibras de aço vêm sendo estudadas como uma alternativa de reforço às estruturas de betão armado. No que diz respeito ao sistema estrutural de lajes fungiformes, os avanços conseguidos no campo da ciência dos materiais e das técnicas de construção já permitem a construção de estruturas onde as lajes são reforçadas praticamente apenas por fibras de aço. Para que este novo sistema construtivo...

Ambientes protegidos e substratos com doses de composto orgânico comercial e so...

O Cerrado brasileiro possui inúmeras espécies frutíferas com potencial econômico para exploração em cultivo comercial. Neste contexto, desenvolveu-se um experimento com mudas de jatobá-do-cerrado na Universidade Estadual de Mato Grosso do Sul, em Aquidauana - MS, de 29-outubro-2009 a 25-fevereiro-2010, em estufa agrícola coberta com filme de polietileno de 150 μm, difusor de luz, possuindo tela termorrefle...

Antioxidant capacity and larvicidal activity of essential oil and extracts from...

The leaves and thin branches of Lippia grandis Schauer, Verbenaceae, are used for flavoring of food in the Brazilian Amazon, as substitute for oregano. In this study the constituents of the essential oil were identified and the antioxidant capacity and larvicidal activity of the oil and methanol extract and its sub-fractions were evaluated. A sensory evaluation was determined in view of absence of toxicity. The...

Spiked pepper: selection of clones toward cropping on the edaphoclimatic condit...

Spiked pepper presents a high yield of essential oil with useful biological properties for human health and agriculture. In order to evaluate the morphoagronomic variability and, afterwards, to select genotypes for plant breeding and cultivation, thirteen clones were propagated. Thus, spiked pepper cuttings were rooted under greenhouse, transferred to a nursery and, afterwards, planted at the experimental area....

Collecting and evaluation of germplasm of spiked pepper from Brazilian Amazon

Spiked pepper (Piper aduncum L.) is an aromatic plant species with high essential oil production. It is a species that occurs abundantly in the Brazilian Amazon. Its essential oil has exploitable biological properties in the human health and agriculture. Aiming to study its germplasm toward future use in genetic breeding programs, collecting was carried out (inflorescences, cuttings, leaves and thin branches) i...

Active Pt-PbOx/C anodes to promote the formic acid oxidation in presence of sul...

The performance of Pt-PbOx-based catalysts to promote the formic acid oxidation is described here. All materials were synthesized by a modified sol-gel method. Voltammetric studies showed that the Pt-PbOx/C anode starts the oxidation process at extremely low potentials. Quasi-stationary polarization experiments and current vs. time measurements confirmed this affirmation.