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Copyright of Tecnura is the property of Tecnura and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Arracacha (Arracacia xanthorrhiza Bancroft) native starch (NS) was oxidized (OS) or acetylated (AS) to produce biodegradable films, changing the concentration of glycerol in order to determine the effect of modifying the starch type and concentration of the plasticizer on the mechanical properties of the films. It was observed that the type of modification of starch and the amount of plasticizer used in the formulae to obtain the films have significant effect (p<0.01) in tensile strength (TS), percent elongation at break (%E) and elasticity modulus (EM). When using AS for the production of films, a greater value in the average TS was reached and this is greater when using lowest amount of plasticizer. While using NS, higher average %E was achieved and this is greater when using higher amount of plasticizer. Among the two factors that affect the mechanical properties of the films obtained, there was not interaction. [ABSTRACT FROM AUTHOR]

Copyright of Tecnura is the property of Tecnura and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Ciencia e Ingenieria Neogranadina is the property of Ciencia e Ingenieria Neogranadina and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Científica Guillermo de Ockham is the property of Revista Cientifica Guillermo de Ockham, Universidad de San Buenaventura and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The influence of two corrosive environments on a short term and the fiber dosage on the compressive mechanical properties of RC-65/35-BN steel fiber reinforced concrete, SFRC, is assessed in this study. The experimental program comprised the test of 54 cylindrical-type SFRC specimens having steel fibers characterized by a length/diameter ratio of 65 and fiber dosages of 30 and 60 kg/m3. Regarding the exposure environments, 18 cylinders were subjected to the action of a watery environment, 18 cylinders were subjected to an environment of 3.5 % NaCl solution (chloride ion) and 18 cylinders were kept in unaltered conditions, during 60 days. A reduction of 2 % in the compressive strength, a decrease of 6 % in the modulus of elasticity, and an increase of 13 % in the Poisson's ratio of the SFRC was observed for this phase of corrosion initiation. These results demonstrated that, on a short time, the corrosive environments do not affect significantly the mechanical properties under compressive stresses of the SFRC used in this study. [ABSTRACT FROM AUTHOR]