Characterization of Lightweight Cementitious Composites Reinforced with Piassava Fibers Using Mechanical Tests and Micro-Tomography


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Abstract


A lightweight mortar produced by the incorporation of EVA (Ethylene-Vinyl Acetate) and reinforced with short fibers of piassava was studied. Piassava fibers were extracted from Attalea funifera Martius plants, which are palm trees from Amazon Forest and, mostly, from the southern region of Bahia, Brazil.  The aim of the study was the evaluation of the internal structure of mortars, by analyzing images from computed micro-tomography through X-rays (μCT) transmissions. Thus, the effect of reinforcement with the element piassava could be measured. It was also performed mechanical tests to evaluate the tensile strength in three-point bending tests and the compression strength of composites. The EVA incorporation resulted in strength losses, but was partially recovered when the fibers were added. The piassava fibers, EVA grains, pores and micro-cracks could be identified, classified and quantified from the application of region descriptors such as area and eccentricity. The characterization using μCT images was efficient in the case of lightweight mortars produced with EVA waste and reinforced with piassava fibers. The analysis of the internal structure regions would be difficult to be studied with other materials characterization techniques
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Keywords


Lightweight Mortar; X-Ray Computed Micro-Tomography; Digital Image Processing; Piassava Fibers

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References


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