Geopolymer-bamboo composite – A novel sustainable construction material

Ribeiro, Ruy A. Sá; Ribeiro, Marilene G. Sá; Sankar, Kaushik; Kriven, Waltraud M.

doi:10.1016/j.conbuildmat.2016.07.037

Cited by 117 publications

(57 citation statements)

References 20 publications

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“…It improves the durability of the resultant binder by reacting with calcium hydroxide to form hydrated calcium aluminates and silicon aluminates. Amazonian MK GP composites have been recently tested and confirmed as a potential green construction material [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Amazonian Metakaolin Reactivity for Geopolymer Synthesis

Ribeiro

Kutyla

et al. 2019

Advances in Materials Science and Engineering

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To determine the viability of using a local resource for geopolymer synthesis, geopolymers were synthesized using metakaolin made from clay mined in the Amazonian region of Brazil. Samples were made with mixed potassium-sodium and pure sodium metakaolin-based geopolymer. Samples were also made using commercial metakaolin (CMK) from BASF, Inc. as a comparison to the Amazonian metakaolin (AMK). Scanning electron microscopy was used to investigate the microstructure of the materials. X-ray diffraction was able to confirm the formation of geopolymer. The mechanical properties of AMK material were nearly equivalent to those based on CMK. Neither CMK nor AMK reacted completely, although samples made with CMK showed less unreacted material. By increasing the mixing intensity and duration, the amount of residual unreacted material was substantially reduced, and mechanical properties were improved.

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Section: Introductionmentioning

confidence: 99%

Amazonian Metakaolin Reactivity for Geopolymer Synthesis

Ribeiro

Kutyla

et al. 2019

Advances in Materials Science and Engineering

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“…The attractive advantages of geopolymers are their use of inexpensive byproducts, like slag, Class F fly ash, various clays, and agricultural wastes which are abundantly available throughout the world . However, it must be noted that in slag‐fly ash binders, stoichiometric geopolymers coexist with other poorly crystalline phases like calcium silicate hydrate (C–S–H) and calcium aluminum silicate hydrate (C–A–S–H) .…”

Section: Introductionmentioning

confidence: 99%

“…5 The attractive advantages of geopolymers are their use of inexpensive byproducts, like slag, Class F fly ash, various clays, and agricultural wastes which are abundantly available throughout the world. [6][7][8][9] However, it must be noted that in slag-fly ash binders, stoichiometric geopolymers coexist with other poorly crystalline phases like calcium silicate hydrate (C-S-H) and calcium aluminum silicate hydrate (C-A-S-H). 10,11 Stoichiometric geopolymers provide excellent fire resistance, ambient temperature production, excellent strength (compressive and flexural), and a lower carbon footprint into the atmosphere during manufacturing as compared to ordinary Portland cement (OPC).…”

Section: Introductionmentioning

confidence: 99%

“…10,11 Stoichiometric geopolymers provide excellent fire resistance, ambient temperature production, excellent strength (compressive and flexural), and a lower carbon footprint into the atmosphere during manufacturing as compared to ordinary Portland cement (OPC). 12 Furthermore, geopolymers are increasingly being considered as matrices for reinforced composites, 8,[13][14][15][16] a variety of refractory applications, corrosion-resistant coatings, and as precursors to ceramic formation. 17 Fly ash is a by-product of coal-burning power plants.…”

Section: Introductionmentioning

confidence: 99%

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Sodium silicate activated slag‐fly ash binders: Part I – Processing, microstructure, and mechanical properties

et al. 2018

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Alkali silicate activated slag and class F fly ash‐based binders are ambient curing, structural materials that are feasible replacements for ordinary Portland cement (OPC). They exhibit advantageous mechanical properties and less environmental impact than OPC. In this work, five sodium silicate activated slag‐fly ash binder mixtures were developed and their compressive and flexural strengths were studied as a function of curing temperature and time. It was found that the strongest mixture sets at ambient temperature and had a Weibull average flexural strength of 5.7 ± 1.5 MPa and Weibull average compressive strength of 60 ± 8 MPa at 28 days. While increasing the slag/fly ash ratio accelerated the strength development, the cure time was decreased due to the formation of calcium silicate hydrate (C–S–H), calcium aluminum silicate hydrate (C–A–S–H), and (Ca,Na) based geopolymer. The density, microstructure, and phase evolution of ambient‐cured, heat‐cured, and heat‐treated binders were studied using pycnometry, scanning electron microscopy, energy dispersive X‐ray spectroscopy (SEM‐EDS), and X‐ray diffraction (XRD). Heat‐cured binders were more dense than ambient‐cured binder. No new crystalline phases evolved through 28 days in ambient‐ or heat‐cured binders.

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“…Accordingly, fiber-reinforced geopolymer composite could potentially provide better mechanical and thermal properties over a wide temperature range as compared to Portland cement or organic polymer-based matrix. 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].…”

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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Geopolymer-bamboo composite – A novel sustainable construction material

Cited by 117 publications

References 20 publications

Amazonian Metakaolin Reactivity for Geopolymer Synthesis

Amazonian Metakaolin Reactivity for Geopolymer Synthesis

Sodium silicate activated slag‐fly ash binders: Part I – Processing, microstructure, and mechanical properties

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

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