Flexural stress enhancement of concrete by incorporation of algal cellulose nanofibers

Cengiz, A. Kemal; Kaya, Murat; Bayramgil, Nursel Pekel

doi:10.1016/j.conbuildmat.2017.05.104

Cited by 41 publications

(12 citation statements)

References 15 publications

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“…The kind of NC is a key factor, as proven by studies carried out by Vazquez et al [87], Hoyos et al [90], Cengiz et al [75], and Alshaghel et al [88]. They used commercial MCC, which has a lower aspect ratio (from 0.04 to 5) and a higher tendency to aggregate in clusters than those of CNF (the aspect ratio can reach values over 100), as showed by SEM images obtained by Alshaghel et al [88], Cengiz et al [75], and Tanpichai [109]. The low aspect ratio of MCC and its aggregate-forming clusters decrease its ability to bond cracks, reducing its reinforcing effect.…”

Section: Nanocelluloses In the Cement And Fiber-cement Industrymentioning

confidence: 99%

“…The low aspect ratio of MCC and its aggregate-forming clusters decrease its ability to bond cracks, reducing its reinforcing effect. In fact, Cengiz et al [75] compared the reinforcing effect of commercial NC from Sigma Aldrich, SEM images of which indicate that it could be actually an MCC, with that of CNF produced from waste algae. While the commercial product notably decreased the flexural strength of the cement mortar, the CNF increased it by up to 170%.…”

Section: Nanocelluloses In the Cement And Fiber-cement Industrymentioning

confidence: 99%

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Nanocelluloses: Natural-Based Materials for Fiber-Reinforced Cement Composites. A Critical Review

et al. 2019

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Nanocelluloses (NCs) are bio-based nano-structurated products that open up new solutions for natural material sciences. Although a high number of papers have described their production, properties, and potential applications in multiple industrial sectors, no review to date has focused on their possible use in cementitious composites, which is the aim of this review. It describes how they could be applied in the manufacturing process as a raw material or an additive. NCs improve mechanical properties (internal bonding strength, modulus of elasticity (MOE), and modulus of rupture (MOR)), alter the rheology of the cement paste, and affect the physical properties of cements/cementitious composites. Additionally, the interactions between NCs and the other components of the fiber cement matrix are analyzed. The final result depends on many factors, such as the NC type, the dosage addition mode, the dispersion, the matrix type, and the curing process. However, all of these factors have not been studied in full so far. This review has also identified a number of unexplored areas of great potential for future research in relation to NC applications for fiber-reinforced cement composites, which will include their use as a surface treatment agent, an anionic flocculant, or an additive for wastewater treatment. Although NCs remain expensive, the market perspective is very promising.

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Section: Nanocelluloses In the Cement And Fiber-cement Industrymentioning

confidence: 99%

Section: Nanocelluloses In the Cement And Fiber-cement Industrymentioning

confidence: 99%

Nanocelluloses: Natural-Based Materials for Fiber-Reinforced Cement Composites. A Critical Review

et al. 2019

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“…Similar results were observed in TGA thermograms (Figure 4) in which all the samples underwent a small decomposition at around 150°C as a result of evaporation of bound water. All samples exhibited the cellulose decomposition process between 290°C and 360°C, which was ascribed to the removal of hemicellulose and lignin during the chemical pretreatment process (Cengiz, Kaya, and Bayramgil 2017). It was also observed that the thermal stability of ATRH, RHCE, MTCE, USCE, TOCNF was in the order TOCNF< MTCE< ATRH< USCE< RHCE with RHCE being the most stable.…”

Section: Thermal Analysismentioning

confidence: 88%

“…The TGA and DSC thermogram of rice husk samples subjected to different treatment methods are shown in Figures 4 and 5. From the DSC thermograms obtained (Figure 5), the samples had very distinct endothermic peaks at the selected working range (Cengiz, Kaya, and Bayramgil 2017) change occurs at 70-100°C due to evaporation of water and the second endothermic reaction which shows the degradation of hemicellulose structure, which is usually observed between 180°C and 300°C (Poletto 2016). Of all the samples analyzed, only alkali-treated rice husks had a small peak at this region, which is an indication of the presence of residual hemicellulose.…”

Section: Thermal Analysismentioning

confidence: 98%

“…The degradation reaction of cellulose starts at 300°C and continues to 400°C with a maximum mass loss occurring at 351, 339 and 305°C for alkali-treated rice husks (ATRH), rice husks cellulose (RHCE), mechanically treated (MTCE) and ultrasonicated cellulose (USCE) respectively (Poletto 2016;Poletto, Ornaghi, and Zattera 2014). Generally, cellulose derived from natural fibers has high thermal stabilities due to αcellulose of lignocellulosic structures (Cengiz, Kaya, and Bayramgil 2017). Similar results were observed in TGA thermograms (Figure 4) in which all the samples underwent a small decomposition at around 150°C as a result of evaporation of bound water.…”

Section: Thermal Analysismentioning

confidence: 99%

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Isolation of Cellulose Nanofibers from Oryza sativa Residues via TEMPO Mediated Oxidation

Madivoli

Kareru

Gachanja

et al. 2020

Journal of Natural Fibers

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Cellulose nanocrystals (CNCs) or cellulose nanofibers (CNFs) with different morphologies, chemical, mechanical and physical properties can be obtained when microcrystalline cellulose is subjected to enzymatic, chemical or mechanical treatment. With the aim of utilizing cellulose nanofibrils (CNFs) from Oryza sativa, we isolated microcrystalline cellulose using the Kraft process, followed by successive fiber fibrillation using mechanical grinding, then (2,2,6,6-Tetrame thylpiperidin-1-yl)oxyl (TEMPO) mediated oxidation. Analysis of pulp fibers obtained after each treatment step revealed that fiber properties such as length, crystallinity and crystal size changed when the pulp was subjected to mechanical grinding, ultrasonication and TEMPO mediated oxidation. The degree of crystallinity of the fibers increased while crystal size and fiber length decreased after each treatment. TEMPO mediated oxidation led to a decrease in fiber length and an increase in degree of crystallinity of the fibers as compared to mechanical treatment and ultrasonication. It further introduced carboxyl functional groups (COOH) on the surface of the fibrils, which implies that the nanofibers obtained in this study could be further functionalized. Hence, TEMPO mediated oxidation offers the possibility of further chemical functionalization of cellulose nanofibers isolated from agricultural residues. 摘要微晶纤维素经酶、化学或机械处理后，可以获得具有不同形貌、化学性质、机械性质和物理性质的纤维素纳米晶体(CNCs)或纤维素纳米纤维 (CNFs). 为了利用来自水稻的纤维素纳米纤维(CNFs)，我们用牛皮纸法分离微晶纤维素，然后用机械研磨法连续纤维纤颤，然后(2,2,6,6-四甲基哌啶-1-基)氧化(TEMPO)介导氧化. 对每个处理步骤后得到的纸浆纤维进行分析，发现当纸浆经过机械研磨、超声波处理和TEMPO介导氧化处理后，纤维的长度、结晶度和晶体大小等特性发生了变化. 各处理后纤维结晶度均有所提高，晶粒尺寸和纤维长度均有所减小. 与机械处理和超声处理相比，TEMPO介导的氧化导致纤维长度缩短，纤维结晶度增加. 进一步在纤维表面引入羧基官能团(COOH)，说明本研究得到的纳米纤维可以进一步功能化. 因此，TEMPO介导氧化为进一步实现从农业残留物中分离的纤维素纳米纤维的化学功能化提供了可能.

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Experimental investigation and prediction on the effects of glass and bamboo fibers as key mixture parameters in reinforced concretes using support vector regression

Mathew

Muthukannan

Ramaswamy³

2021

Structural Concrete

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Nowadays, reinforcement of fiber is necessary for concrete to enhance its quality with mechanical characteristics. The main objective of this work is to determine the mechanical properties of bamboo and glass fiber reinforced concrete. In concrete, E‐glass and bamboo fibers are mixed with three different proportions such as 25:75, 50:50, and 75:25. Cubical‐, beam‐, and cylindrical‐shaped concrete structures are developed for mechanical testing. After the curing period, the cubical structures are utilized for compressive strength testing, the cylindrical specimen for split tensile testing, and the beam‐shaped specimen for flexural strength testing. From the outcomes, 1% fiber substance (glass and bamboo fiber proportions of 75:25) provides better split tensile strength 4.13 N/mm2, compressive strength 42.08 N/mm2, and flexural strength 7.7 N/mm2. The comparative analysis of the proposed concrete composition with the conventional concrete mixture is also carried out. The experimental results are validated using support vector regression, and such predicted outcomes are closer to the experimented values. Furthermore, the ETABS platform is utilized for validating the proposed hybrid fiber reinforced concrete (HFRC) with single reinforcement‐like glass particles. In which, the testing properties like bending moment, shear force, and axial force are favorable for the HFRC.

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Flexural stress enhancement of concrete by incorporation of algal cellulose nanofibers

Cited by 41 publications

References 15 publications

Nanocelluloses: Natural-Based Materials for Fiber-Reinforced Cement Composites. A Critical Review

Nanocelluloses: Natural-Based Materials for Fiber-Reinforced Cement Composites. A Critical Review

Isolation of Cellulose Nanofibers from Oryza sativa Residues via TEMPO Mediated Oxidation

Experimental investigation and prediction on the effects of glass and bamboo fibers as key mixture parameters in reinforced concretes using support vector regression

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