دانلود رایگان مقاله لاتین بتن آرمه نساجی جوت از سایت الزویر
عنوان فارسی مقاله:
اثر شتاب پیری بر روی رابط کاربری بتن آرمه نساجی جوت
عنوان انگلیسی مقاله:
The effect of accelerated aging on the interface of jute textile reinforced concrete
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Natural fibers have been widely studied as a means of reinforcement in cementitious matrices [1e4]. In an alkaline environment fiber degradation occurs, and much has been discussed about how to improve the durability of composites with natural fibers [3e16]. As a result, modifications to the matrices, such as the partial replacement of Portland cement by pozzolanic material, have been tried in order to obtain a matrix with a low calcium hydroxide content [3,4,17,18]. The degradation of natural fiber reinforced composites can also be attributed to the damage occurring to the fiber-matrix interface due to changes in the fibers' volumes within the matrix [7,18e20]. In addition to modifications in the matrix, fiber treatments are often performed in order to remove extractives and wax on the fiber surface, to improve the volumetric stability of the fiber and to enhance the fiber-matrix stress transfer [21e27]. Scheffler et al. [24] observed improvements in the mechanical performance of composites reinforced with glass fibers impregnated with styrene butadiene by increasing the resistance to the alkaline environment in the matrix. Mader et al. € [25] reported a strengthening of the fiber-matrix bond in composites with glass and carbon fibers impregnated with styrene butadiene. Ferreira et al. [26,27] reported that the hornification treatment promotes an enhancement in the fiber-matrix bond due to the modifications in the fiber structure. This improvement is related to the treated fibers' lower water absorption capacity, demonstrated using absorption testing and microstructural analysis. The authors also investigated the influence of controlled alkaline treatment (calcium hydroxide solution) in the fiber-matrix bonding. The results showed that this treatment improved the bond strength once waxes, fats and other amorphous constituents of the fiber were partially removed, increasing the fiber crystallinity and superficial roughness. * Corresponding author. In the case of textile-reinforced concrete, the bond behavior iscompletely different from other materials used as reinforcement since the cross section of the fabric is not homogeneous. Fabrics are composed of yarns, which are in turn composed of filaments. The external filaments of a yarn have direct contact with the matrix; in other words, only a part of the fabric is anchored in the matrix. The internal filaments are not affected by the hydration products of the cement. Thus, there is only friction between the filaments. When the reinforcement is subjected to treatment with polymer, a complete anchoring of all filaments takes place, making the bond between the filaments stronger than the adhesion of the fiber with the matrix [28]. Mumenya et al. [29] investigated the fiber-matrix interface of textile-reinforced concrete using a polypropylene hybrid fiber. The investigation was performed using pullout tests after accelerated aging conditions consisting of 100 cycles of wetting and drying. The results showed no major changes in respect of toughness. There was a small reduction in the peak load values after the wetting and drying cycles due to the following mechanisms: during the wetting cycle there was an increase in the hydration reactions, resulting in a strengthening of the fiber-matrix bond, while the drying cycle induced the formation of microcracks, resulting in a reduction of the peak load value.
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کلمات کلیدی:
Scholarly articles for interface of jute textile reinforced concrete Transition zone studies of vegetable fibre-cement paste … - Savastano - Cited by 121 … in flexure using natural jute fibre textile reinforced … - Sen - Cited by 26 Novel woven sisal fabric reinforced natural rubber … - Jacob - Cited by 32 Search Results The effect of accelerated aging on the interface of jute textile ... www.sciencedirect.com/science/article/pii/S0958946516305066 by MEA Fidelis - 2016 - Cited by 1 - Related articles In this work the degradation mechanisms of concrete reinforced with natural jute textile are discussed. Double-sided pullout tests were performed on specimens reinforced with polymer-coated and uncoated jute fabrics. ... For ordinary Portland cement matrix the maximum fiber pullout ... [PDF]the mechanics of natural jute textile reinforced concrete - Webdefy demo.webdefy.com/rilem-new/wp.../10/d0ae67164c5d05e0365b92dbe7e09237.pdf Textile reinforced concrete (TRC) with fibers of glass, carbon, basalt, ... This research program aims to investigate the fiber-matrix interface through pullout tests. the mechanics of natural jute textile reinforced concrete - RILEM www.rilem.org/gene/main.php?base=500218&id_publication=441&id... ... on Ferrocement and 3rd ICTRC - International Conference on Textile Reinforced Concrete ... polymer was carried out in order to improve the fiber-matrix interface. ... The newly developed composites reinforced with 3 and 5 layers of jute ... [PDF]Tensile and Flexural Properties of Cement Composites Reinforced ... www.mdpi.com/1996-1944/10/2/215/pdf by J Claramunt - 2017 Feb 22, 2017 - In the composites reinforced with textile structures, apart from the ..... of accelerated aging on the interface of jute textile reinforced concrete.
