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Properties Evaluation of Composite Materials Based on Gypsum Plaster and Posidonia Oceanica Fibers

  • Estimating the amount of material without significant losses at the end of hybrid casting is a problem addressed in this study. To minimize manufacturing costs and improve the accuracy of results, a correction factor (CF) was used in the formula to estimate the volume percent of the material in order to reduce material losses during the sample manufacturing stage, allowing for greater confidence between the approved blending plan and the results obtained. In this context, three material mixing schemes of different sizes and shapes (gypsum plaster, sand (0/2), gravel (2/4), and Posidonia oceanica fibers (PO)) were created to verify the efficiency of CF and more precisely study the physico-mechanical effects on the samples. The results show that the use of a CF can reduce mixing loss to almost 0%. The optimal compressive strength of the sample (S1B) with the lowest mixing loss was 7.50 MPa. Under optimal conditions, the addition of PO improves mix volume percent correction (negligible), flexural strength (5.45%), density (18%), and porosity (3.70%) compared with S1B. On the other hand, the addition of PO thermo-chemical treatment by NaOH increases the compressive strength (3.97%) compared with PO due to the removal of impurities on the fiber surface, as shown by scanning electron microscopy. We then determined the optimal mixture ratio (PO divided by a mixture of plaster, sand, and gravel), which equals 0.0321 because Tunisian gypsum contains small amounts of bassanite and calcite, as shown by the X-ray diffraction results.

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Author:Abdessalam Guedri, Kawthar YahyaORCiD, Noureddine Hamdi, Oscar Baeza Urrea, Jean Frank WagnerORCiD, Mohamed Faouzi Zagrarni
Parent Title (English):Buildings
Place of publication:Basel
Document Type:Article
Date of completion:2023/01/09
Date of publication:2023/01/09
Publishing institution:Universit├Ąt Trier
Contributing corporation:The publication was funded by the Open Access Fund of Universit├Ąt Trier and the German Research Foundation (DFG)
Release Date:2023/12/08
Tag:Posidonia oceanica fibers; composite materials; correction factor; gypsum plaster
GND Keyword:Faser; Gips; Neptungras; Optimierung; Verbundwerkstoff
Volume (for the year ...):2023
Issue / no.:Band 13, Heft 1
Number of pages:15
Institutes:Fachbereich 6
Licence (German):License LogoCC BY: Creative-Commons-Lizenz 4.0 International

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