Effect of calcined clay on the properties of cementitious mortar reinforcedby Posidonia Fiber
1Civil Eng. Dept., National School of Engineers of Gabes, University of Gabes, Gabes-Tunisia
2Laboratory of Civil Eng., National School of Engineers of Tunis, University of Tunis El Manar, Tunisia
Posidonia fiber has a negative visual impact on tourism and produces bad odors due to the decomposition of microorganisms. Thus, its recovery for waste recycling and other sustainable uses is encouraged. In this context, the objective of this work was to study the influence of calcined clay as a mineral coating for fibers and the surface treatments (hydro-thermal by water boiling and chemical treatment by NaOH) on the durability of Posidonia fiber and to evaluate their effect on the physical and hygroscopic properties, rheological, mechanical and micro-structural performances, and chemical attack of cementitious mortars with supplementary materials. An experimental study was carried out by varying volume ratios (5%, 12.5%, and 20%). The effects of these treatments on the physical, thermal and morphology properties of the fibers were determined. The water absorption of mortar reinforced by fibers coated with calcined clay decreased compared to composite reinforced by fibers treated without coating. The calcined clay makes the fibers relatively less hydrophilic. According to the various mechanical tests, adding treated Posidonia fibers in a pozzolanic matrix improves the composite properties.
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