Impact of Cement Hydration on Durability of Cellulosic Fiber‐Reinforced Cementitious Composites in the Presence of Metakaolin

Impact of Cement Hydration on Durability of Cellulosic Fiber‐Reinforced Cementitious Composites... IntroductionFiber reinforcements have been widely used to improve the toughness, tensile properties, and cracking resistance of cement based materials. In light of current social concerns for sustainability, cellulosic fibers, which are renewable, biodegradable, environmentally friendly, and energy efficient, have been increasingly studied in recent years. Additionally, their widely availability, excellent mechanical properties, low density, good reinforcing effect, and low cost enable them to be used as potential alternatives to synthetic fibers in sustainable construction materials. The application of cellulosic fiber‐reinforced cement composites in roof sheet, beams, laminate, and interlocking blocks for column and walls. However, in the alkali environment of the Portland cement matrix, cellulosic fibers can be easily “corroded” and this always leads to a shortened service life of composites. The degradation of cellulosic fibers was firstly studied by Gram, who proposed a deleterious effect of Ca2+ elements on fibre degradation. Toledo Filho, and Sundararajan, reported the degradation behavior of different cellulosic fibers in alkaline medium (calcium and sodium hydroxide solutions). In addition to the loss of fiber flexibility and strength, crystallization of calcium hydroxide (CH), which is also a primary cement hydration product, in the fibers lumen, walls and voids was proposed by Toledo Filho et al.Cement http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Engineering Materials Wiley

Impact of Cement Hydration on Durability of Cellulosic Fiber‐Reinforced Cementitious Composites in the Presence of Metakaolin

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Publisher
Wiley Subscription Services, Inc., A Wiley Company
Copyright
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN
1438-1656
eISSN
1527-2648
D.O.I.
10.1002/adem.201700642
Publisher site
See Article on Publisher Site

Abstract

IntroductionFiber reinforcements have been widely used to improve the toughness, tensile properties, and cracking resistance of cement based materials. In light of current social concerns for sustainability, cellulosic fibers, which are renewable, biodegradable, environmentally friendly, and energy efficient, have been increasingly studied in recent years. Additionally, their widely availability, excellent mechanical properties, low density, good reinforcing effect, and low cost enable them to be used as potential alternatives to synthetic fibers in sustainable construction materials. The application of cellulosic fiber‐reinforced cement composites in roof sheet, beams, laminate, and interlocking blocks for column and walls. However, in the alkali environment of the Portland cement matrix, cellulosic fibers can be easily “corroded” and this always leads to a shortened service life of composites. The degradation of cellulosic fibers was firstly studied by Gram, who proposed a deleterious effect of Ca2+ elements on fibre degradation. Toledo Filho, and Sundararajan, reported the degradation behavior of different cellulosic fibers in alkaline medium (calcium and sodium hydroxide solutions). In addition to the loss of fiber flexibility and strength, crystallization of calcium hydroxide (CH), which is also a primary cement hydration product, in the fibers lumen, walls and voids was proposed by Toledo Filho et al.Cement

Journal

Advanced Engineering MaterialsWiley

Published: Jan 1, 2018

Keywords: ; ; ; ;

References

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