Green Fibers-Reinforced Cement Mortar with the Inclusionof Nano-CaCO3and Metakaolin

Over the previous few decades, there has been a noticeable increase in interest in the useof vegetable fibers and supplemental cementitious elements in mortar and concrete. The datepalm frond was utilized in this study to create date palm fibers (DPF), which were then addedto the cement mortar at percentages of 1%, 2%, 3%, 4%, and 5% by cement weight. Therewere two types of DPFs used: one type was untreated, and the other had a mechanical treat-ment that created holes before applying a layer of polychloroprene (neoprene) on the surface.Metakaolin (MK) and nano calcium carbonate (nano-CaCO3) were added to the cement mor-tar by the weight of cement. MK was replaced by 10% of the weight of cement. Besides, thenano-CaCO3was replaced by 1%, 2%, 3%, and 4% of the weight of cement. Mechanical testsfor flowability, compressive strength, and flexural strength were conducted. In addition, oneMCDM methodology called VIKOR is utilized to choose the best combination out of severalcombinations and criteria. The results indicate that a higher DPF concentration enhancesboth compressive and flexural strength. The mixtures with the DPF coating and mechanicaltreatment give the strongest and most significant results. In addition, the flowability of ce-ment mortar decreases when the DPF concentration increases. In addition to the high contentof nano-CaCO3in cement mortar, given the grater reading of strength, the presence of nano-CaCO3in cement mortar reduces the disparity in result values that have a higher DPF content.The mixtures containing 4% and 5% DPF and 3% and 4% nano-CaCO3are the optimal ones,according to the VIKOR technique.