INFLUENCE AND DISPERSION OF NANOFIBER FLOURS OF WOOD MODIFIED ON PROPERTIES OF CEMENT BASED MORTARS
Wood nanofibers from industrial waste have been used as a partial replacement of cement for cement paste at a content of up to 2% by weight of cement. The effect of the nano fiber wood content on the porosity, the compressive strength and the degree of hydration of the cement was investigated. Results have shown an improvement in the compressive strength by more than 40% with 1% of added fiber wood. The chemical modification of nanofibers wood by grafting of chains alkyls in their surfaces can reduce the quantity of water absorbed by the sample. The addition of an anionic additive (SDBS) in the water of mixing improves of more the surface of samples by minimizing the size of pores by emulsion effect, from where the absorption of water reduces. The degree of hydration of the cement has increased with the cellulose content containing nanofibrils. The analyze revealed that the presence of nano fiber wood favored the hydration of the cement by producing more calcium silicate gel and portlandite, probably the main reason for this improvement in compressive strength.
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