Asbestos-free technology with new high toughness polypropylene (PP) fibers in air-cured Hatschek process

Ikai, Sigeo; Reichert, J.; Rodrigues, António V.; Zampieri, V.A.

doi:10.1016/j.conbuildmat.2009.06.019

Cited by 61 publications

(50 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Fiber-cement materials have been widely used in the civil engineering worldwide due to their versatility for manufacturing construction elements, such as flat boards for walls, sidings, corrugated sheets, and tubes, present in most of houses in developing regions as well as in agricultural and industrial buildings [1][2][3]. The major disadvantage in the use of cellulose fibers as alternative reinforcing in cementbased composites is their mineralization in the high alkalinity of the Portland cement matrix, which also led to degradation of their constituents.…”

Section: Introductionmentioning

confidence: 99%

Rationalizing the impact of aging on fiber–matrix interface and stability of cement-based composites submitted to carbonation at early ages

et al. 2016

View full text Add to dashboard Cite

The objective of this work is to show the effect of carbonation at early stages on fiber-cement composites and impact on hydration, chemical and dimension stability. Carbonation increased the content of CaCO 3 polymorphs and consumed Ca(OH) 2 and other hydrated calcium phases. Micrographs and energydispersive spectrometry showed the CaCO 3 formed is precipitated in the pore structure of the matrix, decreasing diffusion of Si, S, and Al during hydration. Therefore, a refining process of pore sizes is produced, and fiber-matrix interface in carbonated composites was improved, leading to volume stabilization of the composite, as indicated by lower drying shrinkage and lower porosity.

show abstract

Section: Introductionmentioning

confidence: 99%

Rationalizing the impact of aging on fiber–matrix interface and stability of cement-based composites submitted to carbonation at early ages

et al. 2016

View full text Add to dashboard Cite

show abstract

“…FCCs are widely used as corrugated or flat roofing materials, as cladding panels, and in water containers and have a large number of applications in building and agriculture (Boras and Gatenholm 1999;Ikai et al 2010). The main reason for incorporating fibers with low modulus of elasticity (MOE) into the cement matrix is to improve the toughness, the tensile strength, and the cracking deformation of the composite (Savastano et al 2006;Won et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Isocyanate-treated cellulose pulp and its effect on the alkali resistance and performance of fiber cement composites

et al. 2013

View full text Add to dashboard Cite

The impact of grafted surface of cellulose fibers on the mechanical and physical properties of fiber-cement composites (FCC) has been investigated. The grafting was performed with n-octadecyl isocyanate [i.e., with an aliphatic isocyanate (AI)], with the intention to protect the cellulose fiber from alkali degradation in the cement matrix. The chemical changes, observed by contact angle measurements and X-ray photoelectron spectroscopy, showed a higher hydrophobic character of AI-treated fibers. The strength of FCC was tested during 28 days of curing treatment. The extracted AI-treated fibers contributed to higher specific energy and final specific deflection after accelerated aging cycles in comparison with the reference composites reinforced with untreated fibers. The higher values of limit of proportionality and modulus of elasticity for composites with AI-treated fibers are an evidence of the densification of the fiber-matrix transition zone. The modulus of rupture values were higher for composites with AI-treated and Soxhlet-extracted fibers after 200 soak and dry aging cycles. In comparison with the reference, AI-treated fibers decreased the water absorption and the apparent porosity of the FCC. The modification of fibers could be a new strategy to improve the performance and stability of cement products reinforced with natural fibers.

show abstract

“…A maioria dos produtos de fibrocimento vendidos no mundo são produzidos pelo processo Hatschek, que possui um alto custo de investimento para a implementação da linha de produção (IKAI et al, 2010). Por isso, estudos recentes têm indicado o processo de extrusão como alternativa econômica para produzir elementos construtivos com características mecânicas e físicas similares, ou até mesmo superiores, aos oriundos por outros processos (ZHOU et al, 2012;TEIXEIRA et al, 2012;LUZ et al, 2015;SILVA et al, 2016).…”

Section: Introductionunclassified

Micro/Nanofibrilas Celulósicas De Eucalyptus Em Fibrocimentos Extrudados

Fonseca

Silva

et al. 2016

CERNE

View full text Add to dashboard Cite

MICRO/NANOFIBRILAS CELULÓSICAS DE EUCALYPTUS EM FIBROCIMENTOS EXTRUDADOSRESUMO: Uma forma alternativa para produção de fibrocimento é a extrusão, que permite entre muitas vantagens a produção de compósitos cimentícios com geometrias diferenciadas e requer baixo investimento inicial para produção industrial. Nesse contexto,o objetivo desse trabalho foi obter micro/nanofibrilas celulósicas de Eucalyptus e avaliar o efeito da adição de diferentes conteúdos dessas micro/nanofibrilas nas propriedades físico-mecânicas de fibrocimentos envelhecidos naturalmente e em ambiente climatizado. Micro/nanofibrilas celulósicas produzidas em desfibrilador mecânico foram caracterizadas quanto a sua morfologia. Compósitos extrudados produzidos com 0,5% e 1,0% (em massa) de micro/nanofibrilas foram comparados com compósitos sem micro/nanofibrilas. Compósitos produzidos a partir das três formulações foram submetidos aoenvelhecimento natural e em ambiente controlado para posterior caracterização por flexão estática, vibração flexural e propriedades físicas. Não houve diferença significativa no módulo de ruptura (MOE), limite de proporcionalidade (LOP), e deformação específica total entre os compósitos com reforço de 0,5 e 1,0% de micro/nanofibrilas e aqueles sem reforço. O módulo elástico estático (MOE) aumentou, e a energia específica diminuiu com 1,0% de micro/nanofibrilas. O módulo de elasticidade dinâmico (E) dos compósitos aumentou com o incremento do conteúdo de micro/nanofibrilas (1,0%) e do tempo de exposição ao envelhecimento natural e controlado. O presente estudo indica que as propriedades físicas (absorção de água -AA, porosidade aparente -PA e densidade aparente -DA) e mecânicas de fibrocimentos são sensíveis à formulação e que esse comportamento varia em função do tempo (135 dias). Essas informações devem ser consideradas úteis para o desenvolvimento de novos materiais reforçados com micro/nanofibrilas de celulose. EUCALYPTUS CELLULOSE MICRO/NANOFIBRILS IN EXTRUDED FIBER-CEMENT COMPOSITESABSTRACT: Extrusion is an alternative process for fiber-cement production and allows many advantages such as different geometries for the extruded products and the low initial investment for industrial production. In this context the aim of this study was to produce cellulose micro/nanofibrils from Eucalyptus pulp and evaluate the properties of cementitious composites made with different contents of cellulose micro/nanofibrils. Cellulose micro/ nanofibrils were produced using a mechanical defibrillator, and characterized for their morphology. Extruded composites were produced with 0.5 to 1.0% (by mass) of micro/ nanofibrils and compared to unreinforced composites. Composites reinforced with 1.0% of micro/nanofibrils presented higher water absorption and apparent porosity than their counter parts. No significant differences were observed for modulus of rupture (MOR), limit of proportionality (LOP) and final specific deformation, between the composites reinforced with 0.5% and 1.0% of micro/nanofibrils and those with no reinforcement. The...

show abstract

Asbestos-free technology with new high toughness polypropylene (PP) fibers in air-cured Hatschek process

Cited by 61 publications

References 3 publications

Rationalizing the impact of aging on fiber–matrix interface and stability of cement-based composites submitted to carbonation at early ages

Rationalizing the impact of aging on fiber–matrix interface and stability of cement-based composites submitted to carbonation at early ages

Isocyanate-treated cellulose pulp and its effect on the alkali resistance and performance of fiber cement composites

Micro/Nanofibrilas Celulósicas De Eucalyptus Em Fibrocimentos Extrudados

Contact Info

Product

Resources

About