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The production of Civil Construction chain covers several segments and results in major impacts to the environment. The cement packaging, for example, is an abundant waste in all constructions that, as CLASS B residues (CONAMA, 2002), should be recycled or deposited in temporary storages; in fact, this disposal is not always done properly. This article is part of a Master thesis that considers that sustainable practices should occur systemically. It rose the hypothesis that fiber Kraft paper could enhance the composition of the cement matrix in order to evaluate its potential uses. To accomplish this goal, the study opted for kraft application in fiber cement boards: practical and flexible component, potentially used for vertical sealing with no structural function. The purpose of this article, therefore, is to analyze the mechanical behavior of a composite cement, reinforced by natural fibers kraft paper derived from discarded packaging of cement. The research method applied has experimental nature. It was produced plates (specimens), adopting three dashes of different percentage, by mass, of fiber content: the first (reference specimen) has no fiber content, but the other two is filled with 6% and 12% of fiber, respectively. The materials used for the production of the specimens were Portland cement (CPV ARI), water, limestone dust and fiber kraft paper. The analysis of the composite includes tests of tensile strength in bending, bulk density, permeability, water absorption and dimensional variation immersion/drying, all defined by the NBR 15498:2007 (Brazilian standards). The composite has not reached yet most of the requirements demanded by the

Comportamento mecânico de compósito cimentício reforçados com fibras de papel Kraft