Cement Materials Based on Cellulosic Fibers for Plasters

Abstract

This paper presents physical and mechanical properties of cementitious composites/plasters containing cellulosic fibers in portion 2.0% and 5.0% of filler replacement after 28 days of hardening. Cellulosic fibers (Greencel) originated from bleached wood pulp and unbleached waste paper used in this experimental work were characterized from the point of view cellulose structure. Experimental investigations reveal that adding cellulosic fibers reduces composites density (up to 8.2 %) in comparison with composites without any fibers. Moreover, the presence of wood pulp and recycled fibers in composites cause higher values of water absorbability than sample without fibers. Also, the decrease in compressive strength values for tested fiber cement plasters was observed (14.1 -18.0 MPa) in comparison to reference sample (26.6 MPa). But the identified compressive strength values are in accordance with European standard (5 MPa) for plasters.

Analysis of the Structure of Cellulose Fibers Using the Imagej Program and Fibercement Properties on their Basis

“…Technical conditions". Findings of experiment [6] showed that fibers of cellulose extracted from waste paper possess following properties: specific gravity -1,5 g/сm 3 , elastic modulus -133 GPа, deformation at break -3…6%. Computer diagnostics of morphometric parameters of cellulose fibers was performed with the use of ImageJ program: length (L f ), width (d f ), the area of projection (А f p ), the area of cross section (S f ), the common area of surface (А ф o ), volume (V f ), coefficient of cross section form (К f S ) were performed with the help of the program ImageJ [3].…”

“…Synthetic fibers contribute into formation of optimal mineral framework and reduce of shrinkage deformations of foam concrete. Authors assume that besides advantages mentioned above, the use of discreet fibers gives an opportunity to reduce the structural weight , improvement of heat-shielding characteristics and fire-resistance of wall fences [6,7]. The term "cellulose fiber" represents the group of fibers that derive from timber and plants, which differ in size, thickness, form and fiber durability.…”

“…Cellulose fibers can be used as micro-reinforcing filler in materials of hydrated hardening. Author considers that cellulose fibers increases durability of cement stone when stretching out 3 times [6]. This research deals with the influence of morphometric indicators of cellulose fibers extracted from waste paper on indicators of durability of cement stone.…”