Fracture and fatigue of natural fiber-reinforced cementitious composites

Savastano, Holmer; Santos, S.F.; Radonjic, Mileva; Soboyejo, W. O.

doi:10.1016/j.cemconcomp.2009.02.006

Cited by 192 publications

(105 citation statements)

References 29 publications

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“…It is well known that this lack of durability is mainly caused, on the one hand, by the calcium hydroxide (portlandite) of the matrix, which degrades the fibers, and, on the other, by changes in environmental moisture, which induce dimensional changes in the vegetable fibers and hence loss of physical contact with the matrix [25][26][27]. To overcome the problem of the calcium hydroxide component, several strategies have been used, such as pozzolanic additions to precipitate the portlandite as calcium silicate hydrate [28][29][30][31][32][33][34][35] or carbonation treatments with CO2 to precipitate the portlandite as calcium carbonate [36]. Concerning the pozzolanic additions, Cyr et al [37] stated that the reactivity of the pozzolan depends on the alkalinity of the matrix and on the fineness of the particles of the mixtures.…”

Section: Introductionmentioning

confidence: 99%

Natural fiber nonwoven reinforced cement composites as sustainable materials for building envelopes

Claramunt

Fernández-Carrasco

Ventura

et al. 2016

Construction and Building Materials

110

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This experimental research analyzes the mechanical performance and durability of façade pieces based on Portland cement matrix and flax nonwovens as reinforcement. Two types of pozzolanic additions (silica fume and metakaolin) combined with nonwovens subjected to different treatments to decrease their water absorption are analyzed as potential materials for fiber-cement sheets for building envelopes with high strength and durability. For this purpose, on the one hand, the mechanical performance and chemical composition of various ternary compositions were studied. On the other hand, various treatments were performed on the nonwovens and the nonwoven-matrix adherence was also analyzed. Finally, composites were prepared from some selected treated nonwovens and matrix mixtures, and their mechanical properties and durability were evaluated under four-point bending tests after 28 days of curing in a humidity chamber and after accelerated aging. The composites developed with the treated nonwovens presented very high performance combined with enough durability to be potential candidates for the development of sustainable materials for building envelopes. Highlights-Mechanical performance and durability of OPC/flax nonwovens composites for façade pieces is explored -The effect of two pozzolanic additions combined with nonwoven treatment is evaluated -Significant improvements in the durability using treated nonwovens 3

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Section: Introductionmentioning

confidence: 99%

Natural fiber nonwoven reinforced cement composites as sustainable materials for building envelopes

Claramunt

Fernández-Carrasco

Ventura

et al. 2016

Construction and Building Materials

110

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“…African women in the diaspora, such as Sossina M. Haile (see Figure 4) of Northwestern University, 24 have also played a significant role in the training of the next generation of materials scientists and engineers. Working in collaboration with materials scientists and engineers from the National Renewable Energy Laboratory (Peter Green) and Columbia University (Simon Billinge), Haile has established the Joint US-Africa Materials Institute (JUAMI), which has organized teaching workshops in Eastern Africa.…”

Section: Women In Materials Science and Engineeringmentioning

confidence: 99%

“…Her work on the recycling of agro-waste into building materials has provided the Caribbean island of Guadeloupe with an example of how sugarcane bagasse fibers can be processed into sustainable building materials. 23,24 Such work can add significant value to agro-waste in ways that could have an impact on the economy of Guadeloupe. It can also serve as an example of how Caribbean countries can use research to drive their economic development.…”

Section: Women In Materials Science and Engineeringmentioning

confidence: 99%

“…In sub-Saharan African countries such as Ethiopia, Nigeria, Tanzania, Uganda, Namibia, mechanisms that were observed during fatigue and fracture experiments on natural fiber-reinforced cementitious composites. 24 Santos is now one of the few Afro-Brazilians employed as an engineering professor in the Department of Materials and Technology at São Paulo State University (UNESP). He is a great example of how international exposure can facilitate the development of minority faculty in the Americas.…”

Section: Nsf-sponsored Programs and Amrsmentioning

confidence: 99%

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Strengthening diversity and cooperation through international collaborations: A focus on Africa, South America, and the Caribbean

Soboyejo

Madsen

2018

MRS Bull.

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Africa is the second largest continent in terms of size and population.1,2 With approximately 1.256 billion people (about 15% of the world’s population) and a land area of 30.3 million square kilometers (including adjacent islands), it occupies about 20.4% of the earth’s total land area.1 A significant fraction of the people in the Caribbean* and South America are of African descent, and there are many historical and cultural links among the people of these regions.3 South America has 422.5 million people, and the Caribbean has about 39.12 million people;1 hence, the total population of all three areas represents about 20% of the world’s population.1,2 Similarities in climate also mean that common approaches can be explored for establishing sustainable building materials, and the range of development indices offer unique opportunities for collaborations in research and education that can facilitate human development.4

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“…Endurance limit requires a large number of tests to determine the fatigue limit below which the material is not sensitive to fatigue phenomenon. In practice, the determination of the endurance limit for cementitious materials is difficult to achieve due to the random nature of the fatigue rupture in areas with limited endurance (17). The only reliable methods for assessing the endurance limit rely on statistical methods (18).…”

Section: Introductionmentioning

confidence: 99%

Static and cyclic performance of cementitious composites reinforced with glass-fibres

Arabi¹

2018

Mater. construcc.

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This paper concerns an experimental study of the influence of short glass-fibres randomly oriented of a reinforced cement-based composite on the mechanical behaviour. The matrix material parameters used are: cement/sand ratio and water/cement ratio fixed at 0.5; the glass-fibre content (0%, 0.5%, 1.0%, 1.5%, 2% and 2.5%) and fibre lengths (3, 6 and 12 mm). Composites mechanical characterisation under static behaviour at flexural and compression tests, shows that the reinforcement effect is beneficial only in flexural case. A synergy (matrix-reinforcement) was observed when fibre length of 12 mm is used with application rate of 2% in flexural. The fatigue behaviour determined by Wöhler plots (stress-number of cycles to rupture), derived from experimental results; showed a large results dispersion which is attributed to many causes initiating this damage. The cyclic tests illustrate brittle character of these materials; even with low-amplitude cycles of loading no adaptation of these materials can be reported. RESUMEN:Rendimiento estático y cíclico de compuestos cementantes reforzados con fibras de vidrio. Este trabajo aborda el estudio experimental de la influencia de fibras de vidrio cortas orientadas al azar sobre el comportamiento mecánico de un composite reforzado de base cemento. Los parámetros de la matriz utilizados son: relación cemento/arena y relación agua/cemento fijada en 0,5; el contenido de fibra de vidrio (0%, 0,5%, 1,0%, 1,5%, 2% y 2,5%) y longitudes de fibra (3, 6 y 12 mm). Los resultados mecánicos de estos compuestos bajo comportamiento estático (flexión y compresión), muestran que el efecto de refuerzo es beneficioso unicamente a flexión. Se observó una sinergia (refuerzo de la matriz) cuando se usó la fibra de 12 mm con una tasa de aplicación del 2% en flexión. El comportamiento a fatiga determinado por las curvas de Wöhler (número de ciclos hasta la rotura), derivado de los resultados experimentales; mostró una gran dispersión de resultados que se atribuye a las muchas causas que pueden iniciar este daño. Las pruebas cíclicas ilustran el carácter quebradizo de estos materiales; y no se pude indicar que exista adaptación de estos materiales, incluso con ciclos de carga de baja amplitud.

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Fracture and fatigue of natural fiber-reinforced cementitious composites

Cited by 192 publications

References 29 publications

Natural fiber nonwoven reinforced cement composites as sustainable materials for building envelopes

Natural fiber nonwoven reinforced cement composites as sustainable materials for building envelopes

Strengthening diversity and cooperation through international collaborations: A focus on Africa, South America, and the Caribbean

Static and cyclic performance of cementitious composites reinforced with glass-fibres

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