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Fiber Reinforced Cementitious Matrix (FRCM) as Strengthening Systems of Existing...
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Fiber Reinforced Cementitious Matrix (FRCM) as Strengthening Systems of Existing Masonry and Concrete Structures

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

Deadline for manuscript submissions: closed (30 June 2016) | Viewed by 29536

Special Issue Editor

Dr. Luciano Ombres

E-Mail Website
Guest Editor
Department of Civil Engineering, University of Calabria, 87036 Cosenza, Italy
Interests: linear and non linear behavior of concrete structures; design of steel structures; composite structures; rehabilitation of concrete and masonry structures with composite materials (polymeric and cementitious fiber reinforced materials)
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The use of fiber-reinforced cementitious matrix (FRCM) as strengthening systems in infrastructure applications has increased significantly. FRCM systems consists of fibers in the form of fabric meshes, embedded into a cement-based matrix; alternative names, such as Textile Reinforced Mortar (TRM), Fiber Reinforced Concrete (FRC), Mineral Based Composites (MBC), Steel Reinforced Grout (SRG), and Textile Reinforced Concrete (TRC), which refer to different types of matrix or application, are also proposed. The aim of this Special Issue of Fibers is to communicate to the scientific and engineering communities the progress made in the research and development of FRCM for the structural rehabilitation of existing concrete and masonry constructions. Original and innovative research, both theoretical and experimental, examining the use of new fiber materials or new cement-based matrix, the effectiveness of FRCM as flexural and shear strengthening systems of reinforced concrete beams, the structural performances of FRCM confined concrete columns, the effectiveness of FRCM as strengthening system of masonry structures, the use of FRCM to improve seismic performance of infrastructures, the structural response of FRCM strengthened structures under severe environmental conditions, and the specific field applications with relevant challenges, are all invited. Papers addressing the procedures (experimental, analytical and numerical) to evaluate both the mechanical properties of FRCM systems and the state of stresses and strains at the interface between the FRCM system and the substrate (concrete or masonry) are particularly welcome. I look forward to submissions from many researchers, and I hope that this Special Issue will bring useful information to both the scientific and engineering communities on the effectiveness of the FRCM as a strengthening system in the rehabilitation of existing concrete and masonry constructions.

Dr. Luciano Ombres
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

  • fiber reinforced cementitious matrix (FRCM)
  • mechanical properties
  • concrete structures
  • masonry structures

Published Papers (4 papers)

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Research

3077 KiB  
Article
3D FE Analysis of RC Beams Externally Strengthened with SRG/SRP Systems
by Francesco Bencardino and Antonio Condello
Fibers 2016, 4(2), 19; https://doi.org/10.3390/fib4020019 - 26 May 2016
Cited by 8 | Viewed by 7189
Abstract
The purpose of this study is to evaluate, through a nonlinear Finite Element (FE) analysis, the structural behavior of Reinforced Concrete (RC) beams externally strengthened by using Steel Reinforced Grout (SRG) and Steel Reinforced Polymer (SRP) systems. The parameters taken into account were [...] Read more.
The purpose of this study is to evaluate, through a nonlinear Finite Element (FE) analysis, the structural behavior of Reinforced Concrete (RC) beams externally strengthened by using Steel Reinforced Grout (SRG) and Steel Reinforced Polymer (SRP) systems. The parameters taken into account were the external strengthening configuration, with or without U-wrap end anchorages, as well as the strengthening materials. The numerical simulations were carried out by using a three-dimensional (3D) FE model. The linear and nonlinear behavior of all materials was modeled by appropriate constitutive laws and the connection between concrete substrate and external reinforcing layer was simulated by means of cohesive surfaces with appropriate bond-slip laws. In order to overcome convergence difficulties, to simulate the quasi-static response of the strengthened RC beams, a dynamic approach was adopted. The numerical results in terms of load-displacement curves, failure modes, and load and strain values at critical stages were validated against some experimental data. As a result, the proposed 3D FE model can be used to predict the structural behavior up to ultimate stage of similar strengthened beams without carrying out experimental tests. Full article
(This article belongs to the Special Issue Fiber Reinforced Cementitious Matrix (FRCM) as Strengthening Systems of Existing Masonry and Concrete Structures)
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2395 KiB  
Article
Strengthening of Masonry Columns with BFRCM or with Steel Wires: An Experimental Study
by Marinella Fossetti and Giovanni Minafò
Fibers 2016, 4(2), 15; https://doi.org/10.3390/fib4020015 - 10 May 2016
Cited by 43 | Viewed by 7259
Abstract
Nowadays, innovative materials are more frequently adopted for strengthening historical constructions and masonry structures. The target of these techniques is to improve the structural efficiency with retrofitting methods while having a reduced aesthetical impact. In particular, the use of basalt fiber together with [...] Read more.
Nowadays, innovative materials are more frequently adopted for strengthening historical constructions and masonry structures. The target of these techniques is to improve the structural efficiency with retrofitting methods while having a reduced aesthetical impact. In particular, the use of basalt fiber together with a cementitious matrix emerges as a new technique. This kind of fiber is obtained by basalt rock without other components, and consequently it could be considered a natural material, compatible with masonry. Another innovative technique for strengthening masonry columns consists of applying steel wires in the correspondence of mortar joints. Both techniques have been recently proposed and some aspects of their structural performances are still open. This paper presents the results of an experimental study on the compressive behavior of clay brick masonry columns reinforced either with Basalt Fiber–Reinforced Cementitious Matrix (BFRCM) or with steel wire collaring. Uniaxial compressive tests were performed on eight retrofitted columns and four control specimens until failure. Two masonry grades were considered by varying the mix used for the mortar. Results are presented and discussed in terms of axial stress-strain curves, failure modes and crack patterns of tested specimens. Comparisons with unreinforced columns show the capability of these techniques in increasing ductility with limited strength enhancements. Full article
(This article belongs to the Special Issue Fiber Reinforced Cementitious Matrix (FRCM) as Strengthening Systems of Existing Masonry and Concrete Structures)
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2224 KiB  
Article
Changes in Properties of Cement and Lime Mortars When Incorporating Fibers from End-of-Life Tires
by Lluís Gil, Ernest Bernat-Masó and Francisco Javier Cañavate
Fibers 2016, 4(1), 7; https://doi.org/10.3390/fib4010007 - 05 Feb 2016
Cited by 18 | Viewed by 7005
Abstract
This paper studies the addition of fibers from end-of-life tires to commercial mortar mixtures. Two different types of mortar, one lime-plastic and other cement-fluid, are mixed with different percentage of fibers ranging from 0% to 1%. The changes in bulk density, consistency, compressive [...] Read more.
This paper studies the addition of fibers from end-of-life tires to commercial mortar mixtures. Two different types of mortar, one lime-plastic and other cement-fluid, are mixed with different percentage of fibers ranging from 0% to 1%. The changes in bulk density, consistency, compressive and flexural strength, dynamic Young modulus and water absorption are studied. According to the results, consistency is the property that shows more relevant changes for an addition of 0.25% fibers. Consistency is related to workability and affects the water absorption and the Young modulus values. On the contrary, bulk density and mechanical properties did not change with the addition of fibers. The results prove that this fiber, considered a waste from recycling of end-of-life tires, can be used in commercial mixtures without losing strength. On the other hand, mortar workability limits the amount of fibers that can be included in the mixture and this parameter determines the performance of the mortar. Full article
(This article belongs to the Special Issue Fiber Reinforced Cementitious Matrix (FRCM) as Strengthening Systems of Existing Masonry and Concrete Structures)
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1038 KiB  
Article
Experimental Analysis of Repaired Masonry Elements with Flax-FRCM and PBO-FRCM Composites Subjected to Axial Bending Loads
by Oscar A. Cevallos, Renato Olivito and Rosamaria Codispoti
Fibers 2015, 3(4), 491-503; https://doi.org/10.3390/fib3040491 - 06 Nov 2015
Cited by 17 | Viewed by 6825
Abstract
In the construction industry, the use of natural fabrics as a reinforcement for cement-based composites has shown great potential. The use of these sustainable composites to provide strengthening or repair old masonry structures that exhibit structural problems mainly due to a poor tensile [...] Read more.
In the construction industry, the use of natural fabrics as a reinforcement for cement-based composites has shown great potential. The use of these sustainable composites to provide strengthening or repair old masonry structures that exhibit structural problems mainly due to a poor tensile strength of the mortar/brick joints is revealed to be a promising area of research. One of the most significant load conditions affecting the mechanical response of masonry structures occurs when axial bending loads are applied on the resistant cross-section. In this study, three different types of masonry elements were built using clay bricks and a lime-based mortar. After 28 days, the samples were subjected to concentric and eccentric compressive loads. In order to produce significant bending effects, the compressive loads were applied with large eccentricity, and a sudden failure characterized the behavior of the unreinforced masonry (URM) elements. The tested masonry specimens were repaired using fabric-reinforced cementitious matrix (FRCM) composites produced using bi-directional flax and polyparaphenylene benzobisoxazole (PBO) fabrics. The mechanical behavior of the URM and repaired samples was compared in terms of load-displacement and moment-curvature responses. Furthermore, the results achieved using flax-FRCM composites were compared with those of using PBO-FRCM composites. Full article
(This article belongs to the Special Issue Fiber Reinforced Cementitious Matrix (FRCM) as Strengthening Systems of Existing Masonry and Concrete Structures)
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