The present study considers the incorporation of the aggregates (sand, gravel) and a product of reinforcement (vegetable fibers of the palm trees) in the plaster, whose principal objective is the formulation of an air concrete which can replace the hydraulic concretes in certain uses and applications, while changing its brittle behavior of traction like any hydraulic binder. The analysis of the results shows that the vegetable fibers incorporated change completely the rheological behavior of material and increase considerably its flexural strength and its ductility, by improving its threshold of cracking. The mode of rupture of the composite depends on the length of fibers used.
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