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Porous and Hygroscopic Materials with Fiber Reinforced Polymers

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Physics and Theory".

Deadline for manuscript submissions: closed (31 October 2020) | Viewed by 5860

Special Issue Editors


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Guest Editor
1. Department of Organic and Wood-Based Construction Materials, Technische Universität Braunschweig, 38102 Braunschweig, Germany
2. Fraunhofer Wilhelm-Klauditz-Institut WKI, 38108 Braunschweig, Germany
Interests: wood science; organic materials; timber; seismic engineering; FRP-reinforced wood, in-situ assessment

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Guest Editor
1. Division of Organic and Wooden Based Materials, Institute of Building Materials, Concrete Construction and Fire Safety, Technische Universität Braunschweig, 38102 Braunschweig, Germany
2. Fraunhofer Institute for Wood Research Wilhelm-Klauditz-Institut WKI, 38108 Braunschweig, Germany
Interests: FRP; fibre reinforced concrete; wood science; bio-composites; hybrid structures; durability of materials; dynamics of structures; recycling and reuse of construction and demolition; agricultural and forestry, and plastic wastes; thermal and fire performance of materials
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Special Issue Information

Fiber-reinforced polymers (FRP) make their way in various fields from aerospace to mechanical and civil engineering applications.  Hybrid systems and materials where original material is reinforced or enhanced with FRP are increasingly used in civil engineering, where wood (a lignocellulosic, organic material) and concrete (inorganic material with cement containing various silicates, aluminates, and oxides) are substrates being reinforced.  Both materials are hygroscopic and porous and this makes the bond (may or may not be via adhesion) extremely challenging.  In addition, biodegradability of wood, concrete alkalinity, heterogeneity, and properties variability are additional variables that must be considered.

As with any combination of various materials, where strain compatibility is required, the properties of the interface under various loading conditions are critical for overall performance of the system.  These include but are not limited to: creep and mechano-sorptive creep, chemical degradation of the interface, effects of temperature, water-vapor pressure, load history and combination of thereof.  These fundamental mechanisms (often described as degradation) are, to the large extent, unknown or only partially explained.

This Special Issue of journal attempts to address the state-of-the-art in research in the area of hybrid systems with special focus on fundamental properties of fiber-reinforced plastic – porous, hygroscopic material interface such as wood-FRP or concrete-FRP, their performance and durability under effects of loads and interaction with the environment.


Prof. Dr. Bohumil Kasal
Prof. Li-Bo Yan
Guest Editors

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Keywords

  • hygroscopic porous materials
  • interface
  • adhesion
  • fiber reinforced polymer
  • concrete
  • wood
  • lignocellulosic material
  • hybrid systems
  • effects of time
  • temperature
  • load history and environment

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Published Papers (2 papers)

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Research

18 pages, 3281 KiB  
Article
Non-Fickian Moisture Transport in Vegetable-Fiber-Reinforced Polymer Composites Using a Langmuir-Type Model
by Rafaela Q. C. Melo, Marcus V. Lia Fook and Antonio G. B. de Lima
Polymers 2020, 12(11), 2503; https://doi.org/10.3390/polym12112503 - 27 Oct 2020
Cited by 10 | Viewed by 2302
Abstract
The purpose of this article was to theoretically study the non-Fickian moisture absorption process in vegetable-fiber-reinforced polymer composites using a Langmuir-type model. Here, the focus was on evaluating the effect of the water layer thickness that surrounds the composite during the water migration [...] Read more.
The purpose of this article was to theoretically study the non-Fickian moisture absorption process in vegetable-fiber-reinforced polymer composites using a Langmuir-type model. Here, the focus was on evaluating the effect of the water layer thickness that surrounds the composite during the water migration process. The solutions of the governing equations were obtained using the finite volume method, considering constant thermophysical properties and non-deformable material. The results for the local and average moisture content and concentration, gradient values, and the transient rates of the free and bound (water) molecules in the process were presented and analyzed. It was observed that the water layer thickness strongly influenced the water absorption kinetics, the moisture content gradient values, and the equilibrium moisture content inside the material. It is envisaged that this new approach will contribute to better interpretation of experimental data and a better understanding of the physical phenomenon of water absorption, which directly affects the properties of composite materials. Full article
(This article belongs to the Special Issue Porous and Hygroscopic Materials with Fiber Reinforced Polymers)
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17 pages, 3970 KiB  
Article
FRP Confinement of Stone Samples after Real Fire Exposure
by Luis Estevan, F. Javier Baeza, Francisco B. Varona and Salvador Ivorra
Polymers 2020, 12(10), 2367; https://doi.org/10.3390/polym12102367 - 15 Oct 2020
Cited by 6 | Viewed by 2395
Abstract
The mechanical properties of stone materials can be severely affected by exposure to high temperatures. The effect of fire on stone buildings could cause irreversible damage and make it necessary to retrofit the affected elements. Particularly, the strengthening of columns by confinement with [...] Read more.
The mechanical properties of stone materials can be severely affected by exposure to high temperatures. The effect of fire on stone buildings could cause irreversible damage and make it necessary to retrofit the affected elements. Particularly, the strengthening of columns by confinement with composites has been widely improved during the last decades. Today, fiber reinforced polymer (FRP) confinement represents a very interesting alternative to traditional steel solutions. This work studied the behavior of cylindrical stone specimens subjected to real fire action and confined by means of CFRP or GFRP jackets, with the aim of assessing the effectiveness of these reinforcement systems applied to a material that has previously been seriously damaged by high temperature exposure. In general, the strengthened samples showed notable increases in strength and ductility. The response seemed to depend basically on the FRP properties and not on the degree of damage that the stone core may have suffered. Finally, the results obtained experimentally were compared with the confinement models proposed by the available design guides, in order to evaluate the accuracy that these models can offer under the different situations addressed in this research. Full article
(This article belongs to the Special Issue Porous and Hygroscopic Materials with Fiber Reinforced Polymers)
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