Mechanical and dynamic properties of coconut fibre reinforced concrete

Ali, Majid; Liu, Anthony; Sou, Hou Chi; Chouw, Nawawi

doi:10.1016/j.conbuildmat.2011.12.068

Cited by 365 publications

(187 citation statements)

References 25 publications

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“…While their compressive strength reduces by 5 % when the sepiolite fibers are used at 0.5 %, as shown in Figure 5, their strength remains the same as the reference series, when they are at 1 % and 3 % at 28 d. The probable reason for this behavior includes poor zones occurring due to poor homogeneity of the concrete, a high water ratio or an excessive amount of fibers. Similar results were observed on natural coconut-fiber-reinforced concrete by M. Ali et al 34 . The mechanical properties such as the static modulus of elasticity, compressive strength, compressive toughness, splitting tensile strength, modulus of rupture, total toughness index and density were investigated by the authors.…”

Section: Compressive Strengthsupporting

confidence: 79%

The use of natural sepiolite fiber in concrete

Koltka¹,

Uygunoğlu²,

Sabah³

et al. 2017

Mater. Tehnol.

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To determine the effect of sepiolitic fibers on the characteristics of fresh and hardened concrete, i.e., slumping, density, air content, ultrasonic pulse velocity, freeze-thaw, compressive strength, bending and splitting, tensile strength tests were conducted by the addition of de-fibered sepiolite to the cement in ratios of 0.5 %, 1 %, 2 % and 3 % of mass fractions. The fibers support higher slumping for fresh concrete and increased workability. Samples with 1 % and 3 % addition have similar compressive strength values to the reference series after 28 d. The bending strength of the 2 % added sample is closer to the bending strength of the 28-days reference concretes; however, it is reduced for 0.5 %, 1 % and 3 %. For all the reinforcement ratios the splitting strength increased. The highest impact strength performed for a 3 % reinforcement sample increased by 29 % and scanning electron microscopy (SEM) investigations reveal that the white sepiolite fibers are dispersed homogenously in the concrete, and therefore it, reinforce especially at the interface of the aggregate cement paste by increasing durability. Keywords: sepiolite fiber, mechanical activation, fiber reinforced concrete.Za dolo~itev vpliva sepiolitnih vlaken na zna~ilnosti sve`ega in strjenega betona so bili izvedeni; razlivanje pri padcu, gostota, vsebnost zraka, hitrost ultrazvo~nega impulza, zmrznjenje in odtajanje, tla~na trdnost, upogibanje in cepilno natezna trdnost z dodatkom razvlaknjenega sepiolita betonu v masnih dele`ih 0,5 %, 1 %, 2 % in 3 %. Vlakna pospe{ujejo razlivanje sve`ega betona in izbolj{ajo njegovo oblikovalnost. Vzorca z dodatkom 1 % in 3 % sta pokazala podobno tla~no trdnost kot referen~na serija po 28 d. Upogibna trdnost pri vzorcu z 2 % dodatka je zelo blizu upogibni trdnosti referen~nega betona po 28 d; vendar je manj{a pri dodatkih 0,5 %, 1 % in 3 %. Pri vseh dodatkih pa je cepilna trdnost narasla. Najvi{ja udarna`ilavost izvedena pri vzorcu s 3 % dodatkom je narasla za 29 % in preiskava z vrsti~nim elektronskim mikroskopom (SEM) je odkrila, da so bela sepiolitna vlakna homogeno razpr{ena v betonu, zato oja~ajo stik agregata s cementno pasto in pove~ajo trajnost betona. Klju~ne besede: sepiolitna vlakna, mehanska aktivacija, z vlaknom oja~an beton

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Section: Compressive Strengthsupporting

confidence: 79%

The use of natural sepiolite fiber in concrete

Koltka¹,

Uygunoğlu²,

Sabah³

et al. 2017

Mater. Tehnol.

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“…Investigations of natural fibres such as sisal, coconut, bamboo, jute, banana, coir and hemp fibres have revealed desirable effects on  the mechanical and physical properties of brittle organic and inorganic matrices [18][19][20][21][22][23][24][25][26][27]. For example, the mechanical and thermal properties of geopolymer resin have been significantly improved as a result of natural wool fibre reinforcement [28,29].…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of cotton fabric reinforced geopolymer composites at 200–1000 °C

et al. 2014

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Abstract:Geopolymer composites containing woven cotton fabric (0-8.3 wt%) were fabricated using the hand lay-up technique, and were exposed to elevated temperatures of 200 ℃, 400 ℃, 600 ℃, 800 ℃ and 1000 ℃. With an increase in temperature, the geopolymer composites exhibited a reduction in compressive strength, flexural strength and fracture toughness. When heated above 600 ℃, the composites exhibited a significant reduction in mechanical properties. They also exhibited brittle behavior due to severe degradation of cotton fibres and the creation of additional porosity in the composites. Microstructural images verified the existence of voids and small channels in the composites due to fibre degradation.

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“…Ali et al (2012) estudou propriedades dinâmicas e estáticas de concretos com teores de adição de fibra que variaram de 1 a 5% (em relação a massa do cimento) e os comprimentos foram: 2,5 5,0 e 7,5 centímetros. De acordo com os resultados obtidos, o comprimento de 5,0 cm com o teor de 5% obteve os melhores resultados em sua pesquisa.…”

Section: A Fibra De Coco Em Matrizes Cimentíciasunclassified

Aplicação De Fibra De Coco Em Matrizes Cimentícias

Silva

Marques

Fornari

2013

REGET

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RESUMOTendo em vista a grande variedade de fibras naturais com potencial para reforço de compósitos usados na produção de argamassas e concretos para construção civil, torna-se imprescindível o conhecimento das potencialidades desses materiais mediante sua caracterização para melhor aplicá-los. As fibras naturais existem em abundância e têm seu uso motivado por serem renováveis, biodegradáveis, pela sua disponibilidade a baixo custo, muitas vezes como resíduos, possibilitando a produção de compósitos também viáveis economicamente. O presente trabalho apresenta uma breve revisão sobre as atuais pesquisas que vêm sendo desenvolvidas em termos de reaproveitamento da fibra do coco na construção civil, mais especificamente em concretos e argamassas. Palavras-chave: Fibra de coco. Construção civil. Impactos ambientais. ABSTRACTIn view of the wide variety of natural fibers with potential for reinforcing composite materials used in the production of mortars and concretes for civil construction, it becomes essential to the knowledge of the potential of these materials through its characterization to best apply them. Natural fibers exist in abundance and have the use caused by being biodegradable, renewable, for its availability at low cost, often as waste, enabling the production of composites also economically viable. This paper presents a brief review about current searches that are being developed in terms of reuse of coconut fiber in construction, more specifically in concretes and mortars. Key words: Coconut fiber. Building constructions. Environmental impacts. INTRODUÇÃOAs matrizes cimentícias são compostas de aglomerantes minerais, podendo conter agregados, que dão origem a pastas, argamassas ou concretos. As matrizes mais utilizadas são aquelas à base de cimento Portland e, em menor escala, a cal e o gesso.A adição de fibras nas matrizes pode melhorar as suas propriedades mecânicas, como a resistência à tração, à flexão e ao impacto. Além disso, altera seu comportamento após fissuração diminuindo os efeitos de uma ruptura brusca da matriz cimentícia (AGOPYAN & SAVASTANO JUNIOR, 2007).Esse fato, associado à necessidade atual de descobrir novas fontes de energia e combustíveis renováveis, exige que o aproveitamento da matéria-prima cultivada seja mais

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Mechanical and dynamic properties of coconut fibre reinforced concrete

Cited by 365 publications

References 25 publications

The use of natural sepiolite fiber in concrete

The use of natural sepiolite fiber in concrete

Mechanical properties of cotton fabric reinforced geopolymer composites at 200–1000 °C

Aplicação De Fibra De Coco Em Matrizes Cimentícias

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