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Fibers
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Mechanics of Fiber Reinforced Cementitious Composites
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Mechanics of Fiber Reinforced Cementitious Composites

A special issue of Fibers (ISSN 2079-6439).

Deadline for manuscript submissions: closed (31 October 2022) | Viewed by 21456

Special Issue Editor

Dr. Heiko Herrmann

E-Mail Website
Guest Editor
Department of Cybernetics, Tallinn University of Technology, 19086 Tallinn, Estonia
Interests: complex materials; composites; mechanics of materials; numerical simulations

Special Issue Information

Dear Colleagues,

The Special Issue invites contributions presenting recent developments and state-of-the-art comparison in the area of mechanics of fiber-reinforced cementitious composites, including thermomechanics.

Fiber-reinforced composites have been known for millennia, starting from the straw-reinforced clay that was used for building houses and furnaces. Concrete has also been used for millennia, with its use being introduced widely by the Romans. Despite this, the mechanical properties of fiber-reinforced cementitious composites are still a subject of research which has seen increasing intensity in recent years.

On one hand, fiber-reinforced cementitious composites offer known advantages over more conventional materials, e.g., reduction of shrinkage cracking, increased load-bearing capacity, strain-hardening, and durability under extreme temperatures in fire safety and refractory applications. On the other hand, the dependency of mechanical properties on the spatial and orientational distribution of the fibers poses challenges, both for theoretical calculation as well as for practical manufacturing.

I look forward to your valuable contribution to the Special Issue, which will present new results in this challenging topic.

Dr. Heiko Herrmann
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Fibers is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Cementitious composites
  • Mechanics of materials
  • Fibers reinforcement
  • Guidelines
  • Experimental analysis
  • Computational methods
  • Thermomechanics

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Published Papers (6 papers)

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Research

16 pages, 10623 KiB  
Article
CFD Comparison of the Influence of Casting of Samples on the Fiber Orientation Distribution
by Oksana Goidyk, Mark Heinštein and Heiko Herrmann
Fibers 2023, 11(1), 6; https://doi.org/10.3390/fib11010006 - 10 Jan 2023
Viewed by 1790
Abstract
The main goal of this research is to show that even a small deviation from the prescribed casting method EN 14651 causes a difference in fiber orientation distribution in sample beams. A further goal is to investigate the difference in the fiber orientation [...] Read more.
The main goal of this research is to show that even a small deviation from the prescribed casting method EN 14651 causes a difference in fiber orientation distribution in sample beams. A further goal is to investigate the difference in the fiber orientation between bottom and side layers, which would carry the tensile load in the in-situ situation (bottom layer) compared to testing according to EN 14651 (side layer). Nowadays, the development of the proper numerical simulations that aim to visualize the casting process of the fresh concrete flow is a promising challenge in the construction industry. To be able to predict the orientation and spatial distribution of the short fibers using numerical tools may significantly simplify the investigations of the fibered composite materials. This paper compares simulations of different casting methods of the fiber concrete mixture with various flowabilities. The casting of the testing specimen was simulated in different ways: the filling of the formwork according to EN 14651, from the center only and from one edge of the formwork using computational fluid dynamics. The influence of different casting methods in combination with four specific sets of the rheological parameters on the final fiber orientation distribution is discussed. The presented outcomes of the simulations demonstrate that even a minor change in the casting procedure can significantly alter the final characteristics of the material. Full article
(This article belongs to the Special Issue Mechanics of Fiber Reinforced Cementitious Composites)
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18 pages, 5208 KiB  
Article
Influence of Roller Configuration on the Fiber–Matrix Distribution and Mechanical Properties of Continuously Produced, Mineral-Impregnated Carbon Fibers (MCFs)
by Marco Liebscher, Jitong Zhao, Gregor Wilms, Albert Michel, Kai Wilhelm and Viktor Mechtcherine
Fibers 2022, 10(5), 42; https://doi.org/10.3390/fib10050042 - 7 May 2022
Cited by 21 | Viewed by 3731
Abstract
The article at hand is envisaged to enumerate significant technological parameters for the successful impregnation of carbon fiber rovings having 50,000 (50 K) filaments, each within a fine-grained, cementitious suspension. Parameters such as the number of rollers as well as the influence of [...] Read more.
The article at hand is envisaged to enumerate significant technological parameters for the successful impregnation of carbon fiber rovings having 50,000 (50 K) filaments, each within a fine-grained, cementitious suspension. Parameters such as the number of rollers as well as the influence of roller deflection and rotation have been investigated and discussed with regard to the quality of the related impregnation and mechanical properties resulting therefrom. Morphological analysis disclosed distinct differences in the fiber matrix distribution, which are particularly reflected in the flexural performance of the mineral-impregnated carbon fibers (MCFs) produced. Moreover, with the best fiber matrix distribution, uniaxial tensile tests on MCFs demonstrated superior tensile strengths, moduli of elasticity, and elongations at rupture. Full article
(This article belongs to the Special Issue Mechanics of Fiber Reinforced Cementitious Composites)
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11 pages, 6611 KiB  
Article
Concrete Reinforced by Hybrid Mix of Short Fibers under Bending
by Vitalijs Lusis, Krishna Kiran Annamaneni and Andrejs Krasnikovs
Fibers 2022, 10(2), 11; https://doi.org/10.3390/fib10020011 - 25 Jan 2022
Cited by 14 | Viewed by 4475
Abstract
In the present study, the mechanical behavior of Fiber-Reinforced Concrete (FRC) beams was studied under bending until rupture. Each beam was reinforced with a hybrid mix of short fibers randomly distributed in its volume. Concrete beams with three different fiber combinations were investigated, [...] Read more.
In the present study, the mechanical behavior of Fiber-Reinforced Concrete (FRC) beams was studied under bending until rupture. Each beam was reinforced with a hybrid mix of short fibers randomly distributed in its volume. Concrete beams with three different fiber combinations were investigated, namely, beams reinforced with (1) a homogeneously distributed mix of short polypropylene fibers (PP) and steel fibers, (2) PP fibers and Alkali Resistant Glass (ARG) fibers, and (3) PP and composite fibers (CF). The amount of short PP fibers was the same in all FRCs. The investigation focused on the fracture mechanisms and the load-bearing capacity of FRC beams with the developing macro cracks. In total, 12 FRC composite prismatic specimens were casted and tested in four-point bending experiments (4PBT). The current load value versus the Crack Mouth Opening Displacement (CMOD) for all FRCs was analyzed. The crack opening relationship and the influence of fibers on the fracture energy and flexural tensile strength were determined. Rupture surfaces of all samples were investigated using an optical microscope. Full article
(This article belongs to the Special Issue Mechanics of Fiber Reinforced Cementitious Composites)
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24 pages, 10895 KiB  
Article
Experimental Investigation and Modelling of the Layered Concrete with Different Concentration of Short Fibers in the Layers
by Vitalijs Lusis, Olga Kononova, Arturs Macanovskis, Rimvydas Stonys, Inga Lasenko and Andrejs Krasnikovs
Fibers 2021, 9(12), 76; https://doi.org/10.3390/fib9120076 - 26 Nov 2021
Cited by 25 | Viewed by 3565
Abstract
The use of steel fiber reinforced concrete (SFRC) in structures with high physical-mechanical characteristics allows engineers to reduce the weight and costs of the structures, to simplify the technology of their production, to reduce or completely eliminate the manual labor needed for reinforcement, [...] Read more.
The use of steel fiber reinforced concrete (SFRC) in structures with high physical-mechanical characteristics allows engineers to reduce the weight and costs of the structures, to simplify the technology of their production, to reduce or completely eliminate the manual labor needed for reinforcement, at the same time increasing reliability and durability. Commonly accepted technology is exploiting randomly distributed in the concrete volume fibers with random each fiber orientation. In structural members subjected to bending, major loads are bearing fibers located close to outer member surfaces. The majority of fibers are slightly loaded. The aim of the present research is to create an SFRC construction with non-homogeneously distributed fibers. We prepared layered SFRC prismatic specimens. Each layer had different amount of short fibers. Specimens were tested by four point bending till the rupture. Material fracture process was modelled based on the single fiber pull-out test results. Modelling results were compared with the experimental curves for beams. Predictions generated by the model were validated by 4PBT of 100 × 100 × 400 mm prisms. Investigation had shown higher load-bearing capacity of layered concrete plates comparing with plate having homogeneously distributed the same amount of fibers. This mechanism is strongly dependent on fiber concentration. A high amount of fibers is leading to new failure mechanisms—pull-out of FRC blocks and decrease of load-bearing capacity. Fracture surface analysis was realized for broken prisms with the goal to analyze fracture process and to improve accuracy of the elaborated model. The general conclusion with regard to modelling results is that the agreement with experimental data is good, numeric modelling results successfully align with the experimental data. Modelling has indicated the existence of additional failure processes besides simple fiber pull-out, which could be expected when fiber concentration exceeds the critical value. Full article
(This article belongs to the Special Issue Mechanics of Fiber Reinforced Cementitious Composites)
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15 pages, 2050 KiB  
Article
Closed-Form Solution Procedure for Simulating Debonding in FRP Strips Glued to a Generic Substrate Material
by Enzo Martinelli
Fibers 2021, 9(4), 22; https://doi.org/10.3390/fib9040022 - 1 Apr 2021
Cited by 11 | Viewed by 3278
Abstract
The present paper proposes a useful closed-form solution for a wide class of mechanical problems, among which one of the most relevant and debated is the deboning process of Fiber-Reinforced Polymer (FRP) strips glued to generic materials and possibly intended as a mode-II [...] Read more.
The present paper proposes a useful closed-form solution for a wide class of mechanical problems, among which one of the most relevant and debated is the deboning process of Fiber-Reinforced Polymer (FRP) strips glued to generic materials and possibly intended as a mode-II fracture process. Specifically, after outlining well-known equations, a novel piecewise analytical formulation based on a cascading solution process is proposed with the aim of keeping the mathematical expressions of the relevant mechanical quantities as simple as possible. Although other analytical solutions and numerical procedures are already available in the literature, the present one is capable of handling the softening or snap-back response deriving from the full-range simulation of the depending process with no need for complex numerical techniques. This is obtained by considering the slip at the free end of the strip as the main displacement control parameter. After some comparisons between the proposed closed-form solution and experimental results available in the literature, some mechanical considerations are highlighted by elaborating on the results of a parametric study considering the variation of the main geometric and mechanical quantities. The numerical code implemented as part of the present study is available to readers in Open Access. Full article
(This article belongs to the Special Issue Mechanics of Fiber Reinforced Cementitious Composites)
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13 pages, 1959 KiB  
Article
Meso-Scale Formulation of a Cracked-Hinge Model for Hybrid Fiber-Reinforced Cement Composites
by Enzo Martinelli, Marco Pepe and Fernando Fraternali
Fibers 2020, 8(9), 56; https://doi.org/10.3390/fib8090056 - 1 Sep 2020
Cited by 12 | Viewed by 3538
Abstract
This study presents a non-linear cracked-hinge model for the post-cracking response of fiber-reinforced cementitious composites loaded in bending. The proposed displacement-based model follows a meso-mechanical approach, which makes it possible to consider explicitly the random distribution and orientation of the reinforcing fibers. Moreover, [...] Read more.
This study presents a non-linear cracked-hinge model for the post-cracking response of fiber-reinforced cementitious composites loaded in bending. The proposed displacement-based model follows a meso-mechanical approach, which makes it possible to consider explicitly the random distribution and orientation of the reinforcing fibers. Moreover, the model allows for considering two different fiber typologies whereas the cement matrix is modelled as a homogeneous material. The proposed mechanical model combines a fracture-based, stress-crack opening relationship for the cementitious matrix with generalized laws aimed to capture the crack-bridging effect played by the reinforcing fibers. These laws are derived by considering both the fiber-to-matrix bond mechanism and fiber anchoring action possibly due to hooked ends. The paper includes a numerical implementation of the proposed theory, which is validated against experimental results dealing with fiber-reinforced cement composites reinforced with different short fibers. The excellent theory vs. experiment matching demonstrates the high technical potential of the presented model, obtained at a reasonable computational cost. Full article
(This article belongs to the Special Issue Mechanics of Fiber Reinforced Cementitious Composites)
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