Investigation of dispersion methodologies of microcrystalline and nano-fibrillated cellulose on cement pastes

Souza, Letícia Oliveira de; Cordazzo, Matheus; Souza, Lourdes Maria Silva de; Tonoli, Gustavo Henrique Denzin; Silva, Flávio de Andrade; Mechtcherine, Viktor

doi:10.1016/j.cemconcomp.2021.104351

Cited by 22 publications

(7 citation statements)

References 46 publications

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“…The results are presented in Table 1, the spread diameters both before and after the strokes. In general, the inclusion of any percentage of NFC led to a significant loss of workability for all three w/c, as previously pointed [19]. The reduction of the diameter was more perceptible before the strokes, with the decrease reaching 65% of the reference value for the 40-N50 specimen.…”

Section: Fresh Propertiessupporting

confidence: 75%

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Effect of nanofibrillated cellulose on shrinkage of cement pastes

de Souza,

de Andrade Silva

et al. 2024

Mater Struct

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This study investigates the effect of nanofibrillated cellulose (NFC) on the total and autogenous shrinkage deformation of cement pastes. Three different water-to-cement ratios (w/c) were used, namely 0.30, 0.35, and 0.40, along with NFC inclusion percentages of 0.000%, 0.025%, and 0.050%. The effects of NFC were evaluated through total and autogenous shrinkage measurements. Total shrinkage evolution was measured using 24-hour-old prisms, while autogenous shrinkage deformation was monitored using sealed prisms and corrugated tubes, and their results were compared. The corrugated tube method provided early-age deformation measurements, while the sealed prism method allowed for direct comparison with free-drying shrinkage specimens. Flow table and bleeding water tests were conducted to support the understanding of the impact of NFC on the cementitious system. The NFC reduced the expansion by up to 85%. Regarding total shrinkage deformation, there was a 36% decrease at the end of 28 days for specimens with a w/c of 0.30 and NFC inclusion of 0.050%. However, this outcome varied for different combinations of w/c and nanocellulose inclusion percentage. The presence of NFC modified the fresh state properties of cement pastes, significantly reducing bleeding water and decreasing the expansion. These findings highlight the potential of NFC as a material for controlling shrinkage deformation, depending on the dosage, and emphasize the importance of considering different measurement methods for accurate assessment.

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Section: Fresh Propertiessupporting

confidence: 75%

“…The NFC was in a gel form, containing 2.0% of nanofibers. The NFC used in this work has been previously characterized and more information can be found elsewhere [19].…”

Section: Composition and Preparing Of Cement Pastesmentioning

confidence: 99%

Effect of nanofibrillated cellulose on shrinkage of cement pastes

de Souza,

de Andrade Silva

et al. 2024

Mater Struct

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“…This technique is suitable for dispersing cellulose into cement paste. 183 Stirring is a general and simple technique to disperse the functional filler in liquid as well as in the matrix. The common stirring equipments are magnetic and electric stirrers.…”

Section: Process and Methods Of Dispersion Technologymentioning

confidence: 99%

“…While the ultrasonication technique completely disperses the functional filler, it could damage the structure of the filler due to its aggressive treatment and the undefined period of ultrasonication. This technique is suitable for dispersing cellulose into cement paste 183 . Stirring is a general and simple technique to disperse the functional filler in liquid as well as in the matrix.…”

Section: Process and Methods Of Dispersion Technologymentioning

confidence: 99%

Smart cement‐sensor composite: The evolution of nanomaterial in developing sensor for structural integrity

Kanagasundaram

Elavenil

2023

Structural Concrete

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The integration of self‐sensing ability and different functional properties of nanomaterials into construction materials leads to smart and multifunctional cementitious sensor composites. Significant evolution of the Structural Health Monitoring (SHM) has helped to elevate the life span and mitigate damages of the structure. Developing smart cementitious sensor composite with electrical properties as a parent element and embedding it in the structural components have proved to be advantageous in terms of evaluating the damages, monitoring the periodic health and life assessment of the structures. In this review, the copious development processes and various methods of designing smart‐sensing cementitious composites have been scrutinized. This work recapitulates the principle of self‐sensing technique, typical functional fillers, trends of percolation threshold, dispersing material, dispersion technology, and also describes the required sensing ability of the sensors using the conduction theory. Subsequently application of smart cement‐sensors in structural components for SHM is discussed. In addition, this review article provides comprehensive information on the effects of nano materials and their dispersion in the development for smart and multifaceted cementitious sensor composites with enhanced sensitivity parameters and economic benefits that are suitable for future prospects.

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“…Microcrystalline cellulose has a higher surface area compared to cement and cellulose fiber. The high specific surface of cellulose microparticles promotes a strong interface with cement hydration products [23], [34]. Fine particles tend to become dense packing, desirable in obtaining cementious systems.…”

Section: Specific Surface Of the Materials Usedmentioning

confidence: 99%

Effect of combined fiber-microcrystalline cellulose reinforcement on the rheology and hydration kinetics of cementitious composites

Bilcati,

Costa,

Tamura

2024

Rev. IBRACON Estrut. Mater.

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The influence of the combined addition of cellulose fibers (FC) and microcrystalline celluloses (MCC) on the fresh properties and hydration kinetics of cementitious composites was investigated. For this purpose, sixteen different formulations of FC-MCC celluloses in the cement matrix were analyzed, in which various cellulose fibers were 0.5%, 1.0%, and 1.5% and microcrystalline cellulose in 0.4%, 0.6% and 0.8% about the cement mass. The cementitious composites with the addition of FC-MCC celluloses were characterized in terms of rheological behavior, which was determined through the Squeeze flow method, fluidity through the mini-slump test, and hydration kinetics determined through the temporal evolution of the temperature of the mixtures. The initial hydration tests showed that the maximum addition of MCC (0.8%) used in this work reduced the maximum temperature of the cementitious composites, as well as the combination of FCs with MCC 0.8. Cellulose fibers took a longer time to reach the maximum temperature. The combined contents of FC 1.0-MCC 0.4 and FC 0.5-MCC 0.6 promoted an increase in the maximum temperature, which could indicate a dispersive effect of the cellulose particles with the cementitious system. The results of the compression flow showed that the studied samples presented a flow with very low loads and extended for a large part of the curve. Te increase in the amount of cellulose fiber alters the main phenomena related to flow: with a high cellulose content (FC 1.5%) there is an increase in friction between the particles, leading to the conclusion that the amount of cellulose fibers in the cementitious system influences on the rheological behavior and the occurrence of phase separation.

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Investigation of dispersion methodologies of microcrystalline and nano-fibrillated cellulose on cement pastes

Cited by 22 publications

References 46 publications

Effect of nanofibrillated cellulose on shrinkage of cement pastes

Effect of nanofibrillated cellulose on shrinkage of cement pastes

Smart cement‐sensor composite: The evolution of nanomaterial in developing sensor for structural integrity

Effect of combined fiber-microcrystalline cellulose reinforcement on the rheology and hydration kinetics of cementitious composites

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