Mechanical Performance of Glass-Based Geopolymer Matrix Composites Reinforced with Cellulose Fibers

Taveri, Gianmarco; Bernardo, Enrico; Dlouhý, Ivo

doi:10.3390/ma11122395

Cited by 10 publications

(6 citation statements)

References 46 publications

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“…For instance, the research reported by Alomayri et al [27] showed the flexural strength improves slightly when the cotton fiber content is lower than 2.1%, and continuously decreases when the content is greater than this value. Chen et al [28][29][30] also reported that the highest flexural strength was obtained by adding 2% natural fibers into geopolymer matrix.…”

Section: Flexural Strengthmentioning

confidence: 97%

Synthesis and Characterization of a Novel Bamboo Shaving Geopolymer Composite

Zhang¹,

Li²,

Zhang³

2022

Journal of Renewable Materials

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Geopolymers are inorganic aluminosilicate materials, which have been a great research interest as a material for sustainable development. However, they possess relatively low toughness properties similar to brittle solids. The limitation may be altered by fiber reinforcement to improve their strength and toughness. This research describes the synthesis of bamboo shaving (BS) reinforced geopolymer composites and the characterization of their mechanical properties. The effect of BS content (0-2 wt. %) on the physical and mechanical properties and microstructure of metakaolin based geopolymer paste were investigated. The workability, setting time, bulk density, apparent porosity, thermal conductivity, compressive strength, flexural strength, scanning electron microscopy (SEM), and X-ray diffraction (XRD) of geopolymer paste were determined. The results showed that the workability, setting time, density, and thermal conductivity decreased with the increasing of BS content. The BS content was proportional to the apparent porosity and a good linear relation was found between apparent porosity and BS content. The highest mechanical properties were achieved at an optimum BS content of 1.0 wt. %. The results of microstructural analysis revealed that BS act as inforcing phase in matrix, reducing cracks and making a dense geopolymer, which leads to favorable adhesion of the composites and produces a geopolymer composite with better mechanical properties than that of pure geopolymer. However, when the BS content exceeded 1.0 wt. %, interfacial bonding between BS and geopolymer matrix became less. XRD analysis showed that BS has little effect on the mineral composition of metakaolin-based geopolymer and no new phase is formed.

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Section: Flexural Strengthmentioning

confidence: 97%

Synthesis and Characterization of a Novel Bamboo Shaving Geopolymer Composite

Zhang¹,

Li²,

Zhang³

2022

Journal of Renewable Materials

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“…The use of borax in a geopolymer mixture, aside from extending the setting time, was also shown to increase the compressive strength marginally (Nazari et al 2014;Nicholson et al 2005). The addition of borax containing boron element was shown to produce a good quality geopolymer (Taveri et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Fresh and Hardened Properties of High Calcium Fly Ash-Based Geopolymer Matrix with High Dosage of Borax

Antoni

Purwantoro

Suyanto

et al. 2019

Iran J Sci Technol Trans Civ Eng

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Your article is protected by copyright and all rights are held exclusively by Shiraz University. This e-offprint is for personal use only and shall not be self-archived in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version for posting on your own website. You may further deposit the accepted manuscript version in any repository, provided it is only made publicly available 12 months after official publication or later and provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be accompanied by the following text: "The final publication is available at link.springer.com". AbstractGeopolymer is synthesized by mixing material rich in alumina and silica, such as fly ash, with a highly alkaline solution to form a hardened matrix. However, when using high calcium fly ash as a precursor, a flash set frequently occurs, i.e., the mixture hardens very rapidly before casting can be completed. The use of borax as an additive has been reported due to its potential to prolong the setting time. In this study, the use of a significantly higher dosage of borax is explored. The results show that the addition of borax up to 20% of fly ash, by mass, into the alkaline solution prolongs the setting time by up to 90 min. Conversely, the addition of higher amounts of borax tends to decrease the compressive strength of the geopolymer, whereas adding a small amount of calcium oxide into the mixture increases the strength marginally, especially when the borax content is small. However, the amount of calcium oxide should be limited because at higher content, the effectiveness of borax to prolong the setting time is reduced.

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“…In earlier studies, the addition of cotton fibres led to a reduction in compressive strength instead of an improvement, and it was attributed to a greater balling together of the fibres, as a result leaving voids in the matrix [49], which was not observed in our foams. Fifth, when cotton fibres are in excess, they can absorb too much water [50], and thus deny the geopolymers around the fibres sufficient water for geopolymerisation, and in turn, decrease the bonding strength between the fibre and the matrix. Therefore, one can conclude that the ratio of cellulose fibres and geopolymer paste was optimal in the GC foams.…”

Section: Resultsmentioning

confidence: 99%

Optimal Design of pH-neutral Geopolymer Foams for Their Use in Ecological Plant Cultivation Systems

et al. 2019

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We have calculated that with the world population projected to increase from 7.5 billion in 2017 to 9.8 in 2050, the next generation (within 33 years) will produce 12,000–13,000 Mt of plastic, and that the yearly consumption will reach 37–40 kilos of plastic per person worldwide. One of the branches of the plastics industry is the production of plastics for agriculture e.g., seed trays and pots. In this paper, novel metakaolin-based geopolymer composites reinforced with cellulosic fibres are presented as an alternative to plastic pots. Materials can be dedicated to agricultural applications, provided they have neutral properties, however, geopolymer paste and its final products have high pH. Therefore, a two-step protocol of neutralisation of the geopolymer foam pots was optimised and implemented. The strength of the geopolymer samples was lower when foams were neutralised. The reinforcement of geopolymers with cellulose clearly prevented the reduction of mechanical properties after neutralisation, which was correlated with the lower volume of pores in the foam and with the cellulose chemical properties. Both, neutralisation and reinforcement with cellulose can also eliminate an efflorescence. Significantly increased plant growth was found in geopolymer pots in comparison to plastic pots. The cellulose in geopolymers resulted in better adsorption and slower desorption of minerals during fertilisation. This effect could also be associated with a lower number of large pores in the presence of cellulose fibres in pots, and thus more stable pore filling and better protection of internal surface interactions.

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Mechanical Performance of Glass-Based Geopolymer Matrix Composites Reinforced with Cellulose Fibers

Cited by 10 publications

References 46 publications

Synthesis and Characterization of a Novel Bamboo Shaving Geopolymer Composite

Synthesis and Characterization of a Novel Bamboo Shaving Geopolymer Composite

Fresh and Hardened Properties of High Calcium Fly Ash-Based Geopolymer Matrix with High Dosage of Borax

Optimal Design of pH-neutral Geopolymer Foams for Their Use in Ecological Plant Cultivation Systems

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