Preprint Article Version 1 This version is not peer-reviewed

The Influences of Moisture on the Mechanical, Morphological and Thermogravimetric Properties of Mineral Wool Made from Basalt Glass Fibers

Version 1 : Received: 18 May 2020 / Approved: 19 May 2020 / Online: 19 May 2020 (03:38:04 CEST)

A peer-reviewed article of this Preprint also exists.

Ivanič, A.; Kravanja, G.; Kidess, W.; Rudolf, R.; Lubej, S. The Influences of Moisture on the Mechanical, Morphological and Thermogravimetric Properties of Mineral Wool Made from Basalt Glass Fibers. Materials 2020, 13, 2392. Ivanič, A.; Kravanja, G.; Kidess, W.; Rudolf, R.; Lubej, S. The Influences of Moisture on the Mechanical, Morphological and Thermogravimetric Properties of Mineral Wool Made from Basalt Glass Fibers. Materials 2020, 13, 2392.

Journal reference: Materials 2020, 13, 2392
DOI: 10.3390/ma13102392

Abstract

Mineral wool made from basalt fibers is frequently used as an insulating material in construction systems. In this study, both unused mineral wool, and wool obtained from the softened roofing area, were comprehensively analyzed in a laboratory using different characterization techniques. Firstly, the amount of initial water content and compressive strength at 10% deformation were determined. Secondly, microstructure and surface chemical composition were analysed by Scanning electron microscopy (SEM) equipped with energy dispersive x-ray spectroscopy (EDX). To study heterogeneities near the fiber surface and to examine cross-sectional composition, a Scanning transmission electron microscope (STEM) was used. Finally, to verify possible reasons for resin degradation, Thermogravimetry analysis and differential scanning colometry (TGA-DSC) were simultaneously carried out. The results show that natural aging under high humidity and thermal fluctuations greatly affects the surface morphology and chemical composition of fibrous composite. Phenol-formaldehyde and other hydrophobic compounds that protect fibers against moisture and give compressive resistance were found to be degraded.

Subject Areas

mineral wool; basalt fibers; moisture effect; compressive strength; degradation; SEM-EDX; STEM; thermal stability; roofing

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