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

Abstract

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 withS1B. 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.

Sustainable reduction of sulfate contained in gypsum waste: perspectives and applications for agroforestry waste and sanitary sewage

“…Plaster gypsum, a semi-hydrated calcium sulfate obtained through dehydration of the gypsum mineral (CaSO 4 .2H 2 O), plays a vital role in the construction industry. Employed in various products such as ceiling tiles, partition blocks, and drywall, gypsum is integral to numerous construction applications (Guedri et al, 2023). However, construction, renovation, and demolition activities result in significant amounts of waste, known as construction and demolition waste (CDW), which includes, in addition to plaster, materials such as wood, concrete, and heavy metals.…”

Advancing the Circular Economy: Reusing Hybrid Bio-Waste-Based Gypsum for Sustainable Building Insulation

“…In terms of thermal behavior, the lowest thermal conductivity is the criterion for lowering building energy consumption. Studies have suggested insulation materials and demonstrated the benefits of natural waste/fibers such as date palm fibers [14], cellulose fibers [25,26], wood waste [7,27], wheat straw [28], Posidonia oceanica fibers [29], rice straw [18], and Sargassum muticum [30].…”

Physico-Mechanical Properties and High-Temperature Resistance of Gypsum-Based Colored Foam Concretes

“…Gypsum is a building material with many advantages, such as fire resistance and high sound insulation [20]. According to the 2019 statistical evaluation, the importance of this item can be estimated [21]. For example, production in the United States is estimated at 20 million tons, China at 16 million tons, Iran at 16 million tons, Turkey at 10 million tons, Spain at 7 million tons and Thailand at 9.3 million tons [19].…”