Durability of flax-basalt hybrid composites for marine applications

Research output: Contribution to conferenceOther

Abstract

The aim of the present work is to evaluate the influence of external layers of mat basalt on thedurability behaviour and performances of flax/epoxy laminates. To this scope, long-term aging testswere performed to evaluate the durability of the two different laminates in critical environmentalconditions.In particular, Flax composites were constituted by ten layers of bidirectional flax fabric whereashybrid laminates (i.e. Flax-Basalt) were produced by replacing four external layers of bidirectionalflax with four layers of basalt mat. Both laminates had a total average thickness equal to 3 mm.The samples were exposed to critical environmental conditions following the ASTM B 117standard. The salt fog had a chemical composition of 5% NaCl solution (pH between 6.5 and 7.2). Inthe climatic chamber, the samples were aged continuously with a temperature of 35°C.Every 2 weeks some samples were mechanically tested until a whole period of 2 months. Theremoved samples, wished and dried, were preserved in a sealed plastic storage bag with silica geldesiccant to ensure no further corrosion evolution during storage. Three point bending tests, dynamicmechanical tests (DMTA) and Charpy impact tests were performed according to ASTM D 790, ASTMD 4065 and ISO 179 standards, respectively.Moreover, five samples of both laminates were removed periodically, dried with a lint free cloth,and weighed with the aim to evaluate the water absorption.The experimental results showed that aging resistance of Flax composites can be improved byusing basalt layers as outer laminae thus evidencing that hybridization with basalt fibres is a practicalapproach for enhancing mechanical properties and durability of natural fibre composites.
Original languageEnglish
Number of pages9
Publication statusPublished - 2015

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Ceramics and Composites

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