Tensile and Bond Characterization of Natural Fibers Embeeded in Inorganic Matrices

Ghiassi, Bahman; Razavizadeh, Arezoo; Oliveira, Daniel V.; Marques, Vera Lúcia Sousa; Lourénço, Paulo B.

doi:10.1007/978-94-017-7515-1_23

Cited by 3 publications

(3 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the fabrication of TRM composites, natural fibers are commonly embedded in cement- or lime-based mortars. Many studies [ 13 , 14 , 15 , 22 , 48 , 49 , 50 ] have considered the use of premixed commercial mortars that may contain, in addition to the primary binder and aggregate, different additives (e.g., pozzolanas, geopolymers) and admixtures (e.g., workability aids, synthetic resins). Mortars with fine granulometry (max.…”

Section: Synthesis and Performance Of Natural Trm Compositesmentioning

confidence: 99%

Design of Strain-Hardening Natural TRM Composites: Current Challenges and Future Research Paths

2023

View full text Add to dashboard Cite

This paper discusses the challenges in using natural fibers for the development of textile-reinforced mortar (TRM) composites with pseudo-strain-hardening and multiple cracking behavior. The particular characteristics of natural vegetal fibers are analyzed with reference to data from the literature. It is concluded that the efficient use of these fibers as composite reinforcement requires the development of treatment or impregnation protocols for overcoming durability issues, eliminating crimping effects in tensile response and imparting dimensional stability. Relevant experimental research on the synthesis and performance of natural TRMs is reviewed, showing that the fabrication of such systems is, at present, largely based on empirical rather than engineering design. In order to set a framework regarding the properties that the constituents of natural TRM must meet, a comparative analysis is performed against inorganic matrix composites comprising synthetic, mineral and metallic reinforcement. This highlights the need for selecting matrix materials compatible with natural fibers in terms of stiffness and strength. Furthermore, a rational methodology for the theoretical design of natural TRM composites is proposed. First-order analysis tools based on rule-of-mixtures and fracture mechanics concepts are considered. Based on the findings of this study, paths for future research are discussed.

show abstract

Section: Synthesis and Performance Of Natural Trm Compositesmentioning

confidence: 99%

Design of Strain-Hardening Natural TRM Composites: Current Challenges and Future Research Paths

2023

View full text Add to dashboard Cite

show abstract

“…This may be attributed to various reasons such as environment degradation, design inadequacies, poor construction practices, lack of regular maintenance, revision of codes of practice, increase in loads and seismic conditions [1][2][3]. The scientific community has turned its interest towards the use of composite materials of natural origin, such as flax, jute, hemp, basalt fibers focusing on issues related to recyclable, renewable and environmentally sustainable materials to replace the most common and used carbon fibers, glass, etc., used for structural reinforcement [4][5][6]. Together with the unquestionable advantages of the latter, there are also problems related to the environmental impact produced during their processing as well as the energy required for their elimination at the end of their life cycle.…”

Section: Introductionmentioning

confidence: 99%

Natural Fiber Composites for Structural Strengthening of Constructions

Olivito

Codispoti

2022

KEM

View full text Add to dashboard Cite

Negli ultimi anni vengono studiate le fibre naturali di origine vegetale come lino, juta, canapa, basalto oltre a quelle derivate dal bambù o dall'ananas, per le loro molteplici proprietà. Tra i principali vantaggi che hanno, ricordiamo: la grande disponibilità in natura; sono rinnovabili, hanno una bassa densità e un costo contenuto, nonché proprietà meccaniche che li rendono interessanti per la realizzazione di materiali compositi fibrorinforzati. Sono utilizzati da tempo in vari settori dell'ingegneria: dall'automotive e aerospaziale all'ingegneria civile per la realizzazione di pannelli, pareti ecc. Attualmente l'attenzione è stata focalizzata sulla possibilità di utilizzarli come materiali di rinforzo su strutture in muratura. Il continuo e crescente interesse per la conservazione dei beni storici richiede sistemi di rinforzo di facile utilizzo e affidabili con relative metodologie di calcolo che permettano di valutare la capacità delle strutture murarie esistenti e rinforzate. Tuttavia, i modelli analitici applicabili alle strutture in muratura armata non sono stati sviluppati allo stesso livello di quelli per altri materiali da costruzione moderni. In particolare, esiste un divario tra i risultati sperimentali di elementi murari armati con sistemi innovativi ei risultati ottenuti da modelli analitici. Tutto ciò ha ostacolato un'analisi completa dell'approccio sperimentale che può fornire un prezioso contributo a metodi di progettazione eccessivamente conservativi per soluzioni di rinforzo innovative. Nel presente lavoro, al fine di validarne l'efficacia vengono mostrati i risultati di un'ampia campagna sperimentale per la caratterizzazione meccanica di compositi con fibre naturali e la loro applicazione ad elementi strutturali in muratura, in diverse condizioni di carico applicato e geometrie murarie. Parole chiave: Fibre naturali – Compositi – FRCM - Massoneria

show abstract

“…The current literature underlines the important role of the debonding phenomenon in the behavior of fiber reinforced strengthening systems externally applied to structural supports in the form of strips and sheets ( [1]- [12]). Experimental investigations, mainly consisting in shear lap bond tests, are generally used for understanding the main features of this phenomenon, together with the role of different factors such as the type of the strengthening system, the characteristics of the masonry material composing the substrate, the modalities of application of the strengthening system, etc.…”

Section: Introductionmentioning

confidence: 99%

Bond behaviour of FRP strengthening applied on curved masonry substrates: numerical study

Grande

Formisano

Ghiassi

et al. 2020

IJMRI

Self Cite

View full text Add to dashboard Cite

The recent experimental and numerical studies concerning the local bond behavior of Fiber Reinforced Polymer (FRP) systems externally applied on curved masonry elements clearly underline the role of the geometric curvature on the performance of FRPs. In particular, the interaction between shear stresses and tension or compression normal stresses both arising at the FRP/masonry interface influences the bond strength and, consequently, the debonding behavior of FRPs. Then, the development of reliable numerical models able to predict the bond behavior of FRPs applied on curved masonry structures necessarily requires to consider this important feature which, on the contrary, is generally neglected in the case of flat substrates.Aim of the present paper is to numerically investigate the bond behavior of FRP strengthening systems externally applied on curved masonry specimens. In particular, considering the simple spring-model approach proposed by the authors in previous research, a new constitutive law derived from the work of Thorenfeld et al. ( 1987) is here proposed by also considering the coupled behavior between shear and normal forces at the reinforcement/masonry interface. Numerical analyses are developed with reference to case studies deduced from the literature and consisting of shear-lap bond tests of curved masonry specimens characterized by different values of the geometric curvature and different strengthening configurations. The obtained results show the ability of the proposed modeling approach in capturing some effects, such as the beneficial friction effect when compression normal stresses develop at the interface level.

show abstract

Tensile and Bond Characterization of Natural Fibers Embeeded in Inorganic Matrices

Cited by 3 publications

References 7 publications

Design of Strain-Hardening Natural TRM Composites: Current Challenges and Future Research Paths

Design of Strain-Hardening Natural TRM Composites: Current Challenges and Future Research Paths

Natural Fiber Composites for Structural Strengthening of Constructions

Bond behaviour of FRP strengthening applied on curved masonry substrates: numerical study

Contact Info

Product

Resources

About