Characterization and Influence of Nanofiber Flours of Wood Modified on Fresh State Properties of Cement Based Mortars

Abstract

Nanofibrillated wood fiber was used as fillers in the partial cement matrix replacing the cement to a content of up to 2% by weight of cement. The nanofibrillated effect of wood fibers on porosity, thermal properties and compressive strength was studied. The results obtained showed an improvement in compressive strength of more than 40% with 1% by weight of wood fiber nanofibrillate. The addition of nanofibrillated wood fiber shows a good pore reduction, and the best result was obtained with emulsion of a mixture incorporating 1% by weight of wood fiber nanofibrillate in the presence of an anionic surfactant (SDBS). Thermal conductivity measurements and thermal expansion coefficient, compared to nanofibrillated wood fiber reinforced cement pastes, showed the reinforcing efficiency of cellulose fiber nanofibrillate. The degree of hydration of the cement increased with nanofibrillated wood fibers. This property has been confirmed by Fourier transform infrared spectroscopy. These analyzes revealed that the presence of nanofibrillated wood fibers generates and promotes the hydration of the cement, producing more portlandite and calcium silicate gel, which influences the compressive strength which gives a strong improvement.

Nanomaterials in Cementitious Composites: An Update

“…Figure 6 shows a transmission electron microscope image of CNFs in an aqueous solution [ 85 ]. All of the studies report that the addition of CNFs improve the degree of hydration [ 86 , 87 , 88 , 89 , 90 ]. CNF can increase both the flexural and compressive strength, possibly because of a higher degree of hydration and densification in the cement paste microstructure, but they lower the workability [ 91 , 92 , 93 , 94 , 95 ].…”

Effect of organoclay and wood fiber inclusion on the mechanical properties and thermal conductivity of cement-based mortars

“…The contact angle device used was an OCA 15 from Dataphysics, equipped with a CCD camera, with a resolution of 752 × 582 square pixels, operating at an acquisition rate of 4 images per second. The data collected was processed using OCA software [27].…”

“…To explain the influence of WFsT, the phase composition of cement was determined through XRD of cement with a percentage variation of WFsT [27]. The corresponding XRD patterns, at one day of treatment, are shown in Figure 3.…”