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Influence of an Impregnation Treatment on the Morphology and Mechanical Behaviour of Flax Yarns Embedded in Hydraulic Lime Mortar

Department of Civil Engineering, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, SA, Italy
Civil Engineering Department, COPPE, Univerdisade Federal do Rio de Janeiro, Rio de Janeiro 21941-972, RJ, Brazil
Author to whom correspondence should be addressed.
Fibers 2019, 7(4), 30;
Received: 25 February 2019 / Revised: 27 March 2019 / Accepted: 1 April 2019 / Published: 4 April 2019
PDF [6485 KB, uploaded 21 April 2019]


The increasing attention toward environmental aspects has led, also in the sector of construction materials, to the need for developing more eco-friendly solutions. Among several options, the employment of low energy raw materials appears as an efficient solution intended to enhance the sustainability of building structures. One of the applications moving in this direction is the use of plant fibers as a reinforcement in cement-based composites, hence named as natural textile reinforced mortar (NTRM) composites. Although representing a promising technique, there are still several open issues concerning the variability of plant fibers properties, the durability, and the mechanical compatibility with the mortar. This study aims at investigating the influence of an impregnation process on the thread’s morphology and on the mechanical response. Therefore, the geometry of dry and impregnated flax threads is identified by using scanning electron microscope (SEM) images analysis, and their mechanical response in tension is assessed. In addition, the fibers-to-mortar bond behavior is investigated by means of pull-out tests. The proposed results show that the impregnation procedure employed, although not improving the fibers-to matrix bond, leads to a standardisation of the threads morphology and reduces the thread’s deformability in tension, and paves the way for further investigations on a larger scale. View Full-Text
Keywords: plant fibers; flax fibers; natural composites; pull-out test plant fibers; flax fibers; natural composites; pull-out test

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Ferrara, G.; Pepe, M.; Martinelli, E.; Dias Tolêdo Filho, R. Influence of an Impregnation Treatment on the Morphology and Mechanical Behaviour of Flax Yarns Embedded in Hydraulic Lime Mortar. Fibers 2019, 7, 30.

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