Synthesis and mechanical properties of new fibre-reinforced composites of inorganic polymers with natural wool fibres

Alzeer, Mohammad I.M.; MacKenzie, Kenneth J.D.

doi:10.1007/s10853-012-6644-3

Cited by 94 publications

(50 citation statements)

References 35 publications

(44 reference statements)

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“…The use of natural fibers such as bamboo, cornhusk, wool, cotton, or flax in geopolymer matrix has been mentioned [16,17,18] and shown with promising results in the recent critical review on fiber-reinforced geopolymers [19,20]. Another study also demonstrates the surface modification of such fiber which improves its alkali resistance and results to an improved flexural strength of a reinforced metakaolin-based geopolymer as compared to that of pristine geopolymer [21]. In contrast, one recent exploratory study [22] reported no significant differences in the flexural strength between that of pristine fly ash based-geopolymer and that of geopolymer reinforced with the untreated coconut coir, cotton, or sisal fibers.…”

Section: Introductionmentioning

confidence: 99%

Chemical Treatment of Waste Abaca for Natural Fiber-Reinforced Geopolymer Composite

2017

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The use of natural fibers in reinforced composites to produce eco-friendly materials is gaining more attention due to their attractive features such as low cost, low density and good mechanical properties, among others. This work thus investigates the potential of waste abaca (Manila hemp) fiber as reinforcing agent in an inorganic aluminosilicate material known as geopolymer. In this study, the waste fibers were subjected to different chemical treatments to modify the surface characteristics and to improve the adhesion with the fly ash-based geopolymer matrix. Definitive screening design of experiment was used to investigate the effect of successive chemical treatment of the fiber on its tensile strength considering the following factors: (1) NaOH pretreatment; (2) soaking time in aluminum salt solution; and (3) final pH of the slurry. The results show that the abaca fiber without alkali pretreatment, soaked for 12 h in Al2(SO4)3 solution and adjusted to pH 6 exhibited the highest tensile strength among the treated fibers. Test results confirmed that the chemical treatment removes the lignin, pectin and hemicellulose, as well as makes the surface rougher with the deposition of aluminum compounds. This improves the interfacial bonding between geopolymer matrix and the abaca fiber, while the geopolymer protects the treated fiber from thermal degradation.

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Section: Introductionmentioning

confidence: 99%

Chemical Treatment of Waste Abaca for Natural Fiber-Reinforced Geopolymer Composite

2017

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“…Sodium-based geopolymer reinforced with corn husk fiber bundles resulted in 14 MPa four-point flexure strength 9 . Sodium-based geopolymer reinforced with 5 wt.% wool fiber bundles yielded 8-9 MPa three-point flexure strength 10 . Sodium-based geopolymer reinforced with 30 wt.% untreated jute weave resulted in 20.5 MPa four-point flexure strength 11 .…”

Section: Introductionmentioning

confidence: 99%

Mixed Alkali Regional Metakaolin‐Based Geopolymer

SáRibeiro

Sankar

et al. 2017

Ceramic Engineering and Science Proceedings

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In pursuit of sustainable construction, regional natural materials can be used as a base for geopolymer processing. For higher strength achievement, this study uses mixed potassium-sodium geopolymer. Geopolymer was synthesized using metakaolin produced from kaolinite extracted from Amazonian soil, and microscopically compared to a commercial, highly reactive, metakaolin-based geopolymer. Amazonian kaolin was converted into metakaolin by calcination up to 700 °C. X-ray diffraction (XRD) analysis showed the resulting amorphous metakaolin to be 76% pure, with 24% crystalline quartz impurity. Four-point flexural and compressive strength testings of the geopolymer were carried out according to ASTM standards. Scanning electron microscopy was used to investigate the microstructure and the Si/Al ratio. In addition, XRD was used to confirm the formation of geopolymer.

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“…Sodium‐based geopolymer reinforced with corn husk fiber bundles resulted in 14.1 MPa four‐point flexure strength . Sodium‐based geopolymer reinforced with 5 wt% wool fiber bundles yielded 8.1–9.1 MPa three‐point flexure strength . Sodium‐based geopolymer reinforced with 30 wt% untreated jute weave resulted in 20.5 MPa four‐point flexure strength .…”

Section: Introductionmentioning

confidence: 99%

Potassium‐Based Geopolymer Composites Reinforced with Chopped Bamboo Fibers

Sankar

Ribeiro

et al. 2016

J. Am. Ceram. Soc.

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Bamboo is a fast-growing, readily available natural material with tensile specific strength equivalent to that of steel (250-625 MPa/g/cm 3 ). In the pursuit of sustainable construction materials, a composite was made with potassium polysialate siloxo geopolymer as the matrix and randomly oriented chopped bamboo fibers (Guadua angustifolia) from the Amazon region as the reinforcement. Four-point flexural strength testing of the geopolymer composite reinforced with bamboo fibers was carried out according to ASTM standard C78/C78M-10 e1. Potassiumbased metakaolin geopolymer reinforced with 5 wt% (8 vol%) untreated bamboo fibers yielded 7.5 MPa four-point flexural strength. Scanning electron microscopy and optical microscopy were used to investigate the microstructure. In addition, X-ray diffraction was used to confirm the formation of geopolymer. the relationships between composition, processing, microstructure, and the properties of metakaolin-based geopolymers (MKGPs) and found that the best compressive strength is obtained when the Si:Al molar ratio is 2:1 in geopolymers. When compared to ordinary portland cement (OPC), geopolymers have faster setting time and lower density. The mechanical properties of geopolymers are superior to portland cement in general, but are influenced by the contents of the liquid phase in the mixture, the curing temperature, and the final porosity of the body. 5 The energy required to produce geopolymer is considerably lower than that required for OPC. The extent of reduction in energy depends upon the raw materials used to make the geopolymer. 7 They are processed as a liquid enabling them to be cast into any shape and cured at ambient or slightly elevated temperatures. However, like ceramics, pure geopolymers are brittle and are weak in tension. Their failure is catastrophic with very little warning signal. On the other hand, they can

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Synthesis and mechanical properties of new fibre-reinforced composites of inorganic polymers with natural wool fibres

Cited by 94 publications

References 35 publications

Chemical Treatment of Waste Abaca for Natural Fiber-Reinforced Geopolymer Composite

Chemical Treatment of Waste Abaca for Natural Fiber-Reinforced Geopolymer Composite

Mixed Alkali Regional Metakaolin‐Based Geopolymer

Potassium‐Based Geopolymer Composites Reinforced with Chopped Bamboo Fibers

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