Nanofibrillated cellulose and cellulosic pulp for reinforcement of the extruded cement based materials

Correia, Viviane da Costa; Santos, S.F.; Teixeira, Ronaldo Soares; Savastano, Holmer

doi:10.1016/j.conbuildmat.2017.11.066

Cited by 69 publications

(38 citation statements)

References 43 publications

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“…The results achieved by Urrea-Ceferino et al [36] show that accelerated carbonation curing reduces matrix alkalinity and mitigates the cellulose degradation in cementitious composites. Table 1 presents the results of the study developed by Correia et al [82]. The authors studied the effect of hybrid reinforcement (bamboo nanofibrillated cellulose + bamboo pulp) in the performance of carbonated cement composites produced by the extrusion process in comparison to carbonated composites reinforced with only bamboo pulp, at 28 days and after 200 cycles of immersion and drying.…”

Section: Accelerated Carbonation Curing For Cement-4 Based Compositesmentioning

confidence: 99%

“…The results indicate that the nanofibers present a higher contribution to delay the onset of crack propagation and its potential to act as stress transfer bridges in the nanocracking, mainly after 200 cycles of immersion and drying. The results of flexural stress (MOR) and energy of fracture shows that after accelerated aging the nanofibrillated cellulose preserved partially its ability to form bonds, once the fibers have remained undamaged [82]. Thus, the potential of the use of nanofibrillated cellulose as a reinforcing element of cementitious materials to increase the mechanical performance of these materials was assessed.…”

Section: Accelerated Carbonation Curing For Cement-4 Based Compositesmentioning

confidence: 99%

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Utilization of vegetable fibers for production of reinforced cementitious materials

Correia¹,

Santos²,

Savastano

et al. 2018

RILEM Tech Lett

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Vegetable fibers produced from agroindustrial resources in the macro, micro and nanometric scales have been used as reinforcement in cementitious materials. The cellulosic pulp, besides being used as the reinforcing element, is also the processing fiber that is responsible for the filtration system in the Hatcheck method. On the other hand, the nanofibrillated cellulose has the advantage of having good mechanical performance and high specific surface, which contributes to improve the adhesion between fiber and matrix. In the hybrid reinforcement, with micro and nanofibers, the cellulose performs bonding elements with the matrix and acts as stress transfer bridges in the micro and nano-cracking network with the corresponding strengthening and toughening of the cementitious composite. Some strategies are studied to mitigate the degradation of the vegetable fibers used in cost-effective and non-conventional fiber cement, as well as to reach a sustainable fiber cement production. As a practical example, the accelerated carbonation curing at early age is a developing technology to increase the durability of composite materials: it decreases porosity, promotes a higher density in the interface generating a good fiber–matrix adhesion and a better mechanical behavior. Thus, the vegetable fibers are potentially applicable to produce high mechanical performance and sustainable cementitious materials for use in the Civil Construction.

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Section: Accelerated Carbonation Curing For Cement-4 Based Compositesmentioning

confidence: 99%

Section: Accelerated Carbonation Curing For Cement-4 Based Compositesmentioning

confidence: 99%

Utilization of vegetable fibers for production of reinforced cementitious materials

Correia¹,

Santos²,

Savastano

et al. 2018

RILEM Tech Lett

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“…NFCs contain crystalline and amorphous regions and they have diameters in the range of 5-60 nm and lengths of several hundred nanometers (Klemm et al 2011;Klemm et al 2018). NFCs have high specific surface area, which increase the interaction of the fibers with the matrix promoting the higher mechanical strength of the reinforced composites (Correia et al 2018a;Correia et al 2016;Ardanuy et al 2012a;Ardanuy et al 2012b). According to Correia et al (2018b) NFC contribute to the increase of the physical and chemical adhesion, friction and mechanical anchorage with the matrix with respect pulps, induced by its high specific surface area.…”

Section: Introductionmentioning

confidence: 99%

“…Eucalyptus and pinus pulp are traditionally used in the producing of commercial fibercement products by the Hatschek process, but some studies have shown that bamboo pulp and NFCs also have potential to be used as reinforcement for these cement-based materials (Correia et al 2018a ;Li et al 2017;Xie et al 2015;Correia et al 2014;Rodrigues et al 2010;Rodrigues et al 2006;Coutts and Ni 1995).…”

Section: Introductionmentioning

confidence: 99%

Assessment of chemical and mechanical behavior of bamboo pulp and nanofibrillated cellulose exposed to alkaline environments

2019

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This study was performed to study the effects of the cement paste composition (calcium aluminate cement-CAC-and a geopolymer in comparison to Portland cement-OPC-) on bamboo pulp and nanofibrillated cellulose (NFC). The changes in the composition and chemical structure of the fibers were analyzed by X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR). The changes in the mechanical strength were evaluated through tensile tests on the fibers after immersion on the cement pastes, in the form of sheets. The XPS results showed that the immersion of the pulp and NFC in the different pastes (CAC, geopolymer and OPC) modified the chemical surface of these fibers: it was found removal of lignin and extractives and some degradation of hemicellulose and cellulose. The FTIR analysis indicated modifications in the hydrogen bonds energy. The tensile strength of pulp sheets decreased in 70% and 34% after immersion in OPC and geopolymer, respectively. The tensile strength of the NFC sheets decreased 36%, 68% and 54% after immersion in OPC, CAC and geopolymer, respectively. Thus, the response of the bamboo pulp and NFC immersed in different cement pastes was different due the inherent characteristics of such fibers, and not only the Portland cement should be considered as harmful to lignocellulosic fibers. Although CAC and geopolymer are free of calcium hydroxide, the high alkalinity of these pastes also accelerated the degradation process of lignocellulosic fibers.

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“…However, under accelerated aging by carbonation, the composites with or without nanofibers do not reduce the mechanical performance due to the lower alkalinity provided by the accelerated carbonation. Therefore, the nanofibrillated cellulose appears to be a promising material to be used as nano-reinforcement of the extruded hybrid cement-based composites [25]. Moreover, PVA and macro-synthetic fibers offer a good performance in terms of bonding strength with the cement matrix thanks to its hydrophilicity [26,27], which compensates for the potential of cracking occurring in the matrix.…”

Section: Introductionmentioning

confidence: 99%

Early Age Carbonation of Fiber-Cement Composites under Real Processing Conditions: A Parametric Investigation

et al. 2018

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This paper presents the outcome of a comprehensive experimental program undertaken to study the performance of cellulose pulp and synthetic PVA (polyvinyl alcohol) based fiber-cement composite under both carbonated and non-carbonated curing conditions at early age. The composites were produced at different rolling pressures (2.5 to 9.0 bar) and subjected to various curing conditions in which the effects of CO 2 pressure (1 to 3 bar) and curing time (3 to 9 h) were studied. The mechanical properties (modulus of elasticity (MOE), modulus of rupture (MOR), and toughness), as well as the physical properties (porosity, bulk density, and water absorption), were measured for all samples. Scanning electron microscopy (SEM) was used to investigate the effect of carbonation on porosity change and adhesion of fiber-matrix. A parametric investigation of the effects of the carbonation curing period, CO 2 pressure, and rolling pressure on the improvement of the physical and mechanical properties during carbonation curing was performed. Results showed that fiber-cement composites cured with an elevated CO 2 pressure of 3 bar, rolling pressure of 3 bar, and 5 h of curing time provided optimal curing conditions resulting in the most desirable mechanical and physical properties. However, toughness was greatly reduced with the increase of the CO 2 pressure, curing time, and rolling pressure. Additionally, the carbonation curing improved the bonding between the fiber and the cement matrix because of the precipitation of calcite particularly in the pores of the interfacial transition zone (ITZ) between the cement matrix and the fibers.

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Nanofibrillated cellulose and cellulosic pulp for reinforcement of the extruded cement based materials

Cited by 69 publications

References 43 publications

Utilization of vegetable fibers for production of reinforced cementitious materials

Utilization of vegetable fibers for production of reinforced cementitious materials

Assessment of chemical and mechanical behavior of bamboo pulp and nanofibrillated cellulose exposed to alkaline environments

Early Age Carbonation of Fiber-Cement Composites under Real Processing Conditions: A Parametric Investigation

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