A review of properties of bio-fibrous concrete exposed to elevated temperatures

Aluko, Oluwatobi Gbenga; Yatim, Jamaludin Mohamad; Kadir, Mariyana Aida Ab.; Yahya, Khairulzan

doi:10.1016/j.conbuildmat.2020.119671

Cited by 36 publications

(19 citation statements)

References 101 publications

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“…After heating the kaolinitic soil to 750 • C for 5 h in a furnace (Nabertherm, United States) to obtain the respective amorphous kaolin (metakaolin), alkali activator (NaOH and Na 2 SiO 3 ) solutions were added to dissolve and geopolymerize the aluminosilicates. A sodium hydroxide (NaOH) solution, 6 mol/L (M), was prepared using pure sodium hydroxide pellets (Merck, Germany) and deionized water, while the Na 2 SiO 3 solution was composed of 27 wt% SiO 2 , and 8 wt% Na 2 O (Pan et al, 1999;Mohanty et al, 2000;Aluko et al, 2020).…”

Section: Materials and Chemicalsmentioning

confidence: 99%

“…The constituents of jute fibers are hemicellulose, lignin and cellulose (Aluko et al, 2020), in proportions, 20-26 wt% hemicellulose, 12-15 wt% lignin, and 58-63 wt% cellulose (Pan et al, 1999). The density of jute fibers varies from 1.30 to 1.45 g/cm 3 (Mohanty et al, 2000).…”

Section: Analysis Of Microstructurementioning

confidence: 99%

“…Metakaolin, as an amorphous aluminosilicate, dissolves in the alkaline solution and is transformed into a stable and strong tectosilicate (geopolymer matrix) (Silva et al, 2020a). The resulting geopolymer matrix acts as a binder (Aluko et al, 2020;Marczak et al, 2020) in which an amorphous matrix (point B) coexists with a partially unreacted precursor (metakaolin) (point A). More detailed analysis of the reactions between the alkali activating solution and the precursors can be found in our previous research (Alshaaer et al, 2017).…”

Section: Analysis Of Microstructurementioning

confidence: 99%

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Synthesis, Characterization, and Recyclability of a Functional Jute-Based Geopolymer Composite

Alshaaer

2021

Front. Built Environ.

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This study describes the properties of geopolymer composites reinforced with bidirectional jute fibers. Their flexural strength is 12 MPa, four times higher than the strength of non-reinforced reference geopolymers. The bidirectional jute-reinforced geopolymer composite (JGC) is characterized by ductility and high elongation as well as strain hardening with a modulus of 66 MPa. It is found that the introduction of bidirectional jute fibers in the geopolymer matrix increases the adsorption capacity of Cr ions from 2.7 to 6.4 mg/g (pH = 5). The JGC can be recycled by grinding the material, and then using both the geopolymer material and the jute micro-fibers as filler and reinforcement for a new geopolymer matrix. The micro-fiber jute-reinforced composite obtained showed noteworthy mechanical properties, with strength three times higher than that of the reference material, when 2.5 wt% filler was added. Moreover, the ductility of the composite can be substantially enhanced by increasing (up to 10 wt%) the proportion of recycled jute-based geopolymer filler. These composites are therefore proposed as candidate materials for applications in the context of a circular economy.

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Section: Materials and Chemicalsmentioning

confidence: 99%

Section: Analysis Of Microstructurementioning

confidence: 99%

Section: Analysis Of Microstructurementioning

confidence: 99%

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Synthesis, Characterization, and Recyclability of a Functional Jute-Based Geopolymer Composite

Alshaaer

2021

Front. Built Environ.

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“…Although concrete, as an inert material, performs better at high temperatures and has a higher capacity to endure fire than other materials due to its low thermal conductivity and non-combustibility, the damaging impacts of fire on the mechanical properties and durability of concrete remain a concern to many researchers [1,4]. Some of the types of fire damage to concrete include explosive spalling, strength loss, and cracking [5].…”

Section: Introductionmentioning

confidence: 99%

“…The mechanism of polypropylene fibers when exposed to high temperatures is the most efficient amongst those of synthetic fibers because they melt at 170 • C and create a porous structure, which reduces the build-up of pore pressure inside the heated concrete structure [9]. They perform better than steel fibers in preventing spalling, although they negatively affect the concrete's other mechanical properties, since they reduce the remaining compressive strength, modulus of elasticity, and tensile strength of the fired concrete [4,10]. Conclusions on the use of PP fibers and their influence on the fire resistance of concrete or mortar are conflicting.…”

Section: Introductionmentioning

confidence: 99%

Post-Fire Mechanical Properties of Concrete Reinforced with Spanish Broom Fibers

Juradin

Vranješ²,

Jozić

et al. 2021

J. Compos. Sci.

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In this study, we conducted an initial investigation of the post-fire mechanical properties of concrete reinforced with Spanish broom fibers. The mechanical properties were determined at room temperature, and the post-fire mechanical properties were determined at elevated temperature, so that the fire resistance of the concrete could be determined. Five mixtures were considered: three with differently treated Spanish broom fibers, a polypropylene fiber mixture, and a reference concrete mixture. The concrete and reinforced concrete samples were first dried to 100 °C, then heated to 400 °C, and left to cool to room temperature. The samples were tested immediately and 96 h after cooling. The compressive strength, weight loss, ultrasonic pulse velocity, and dynamic modulus of elasticity were determined and compared. The cross-sectional images of the concrete samples captured through an optical microscope were observed and analyzed. The changes in fiber structure were monitored by TG/DTG analysis. The results of the study indicate that even the reference concrete mixture did not have satisfactory residual properties. The reinforced concretes did not improve the residual properties of the reference concrete, but reduced the spalling and explosive failure performance under a compressive load. The concrete reinforced with Spanish broom fibers showed improved residual properties compared with concrete reinforced with polypropylene fibers.

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Challenges and prospects in energetic application of Pithecellobium dulce (Roxb.) Benth as a bioenergy tree

Aleman‐Ramirez,

Okoye,

Torres‐Arellano

et al. 2024

Biofuels Bioprod Bioref

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A report on the Pithecellobium dulce tree is provided in this review. The main characteristics of the tree, its chemical composition, traditional applications and future application in the bioenergy area are addressed. Pithecellobium dulce is a leguminous tree characterized by being fast growing, nitrogen fixing and largely available. In addition, it is distinguished by growing in different types of soils from acid to alkaline and with little water. This review could serve as a scientific basis to promote and carry out new research work focused on individual and comprehensive use for various bioenergetic processes, from the different parts that make up the P. dulce tree such as its leaves, pods, branches, flowers, fruit and seeds. Among the bioenergetic processes that could be developed are the production of bioethanol, biodiesel, biogas, heterogeneous catalysts, biochar, activated carbon and nanoparticles, among other applications.

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A review of properties of bio-fibrous concrete exposed to elevated temperatures

Cited by 36 publications

References 101 publications

Synthesis, Characterization, and Recyclability of a Functional Jute-Based Geopolymer Composite

Synthesis, Characterization, and Recyclability of a Functional Jute-Based Geopolymer Composite

Post-Fire Mechanical Properties of Concrete Reinforced with Spanish Broom Fibers

Challenges and prospects in energetic application of Pithecellobium dulce (Roxb.) Benth as a bioenergy tree

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