Um with melamine.Figure 21. Cont.Coatings 2021, 11,20 ofFigure 21. Analysis location and outcomes for the compound containing polycarbonate salts with calcium sulfate, displaying the common sample location and X-ray spectrograph (supply: the author): (a) micrograph of Almonertinib Purity gypsum with polycarbonate salts; (b) chemical composition; (c) chemical composition of gypsum with polycarbonate salts.Figure 22. Analysis region and results for the compound containing calcium sulfate with polycarboxylate. Displaying the basic sample area and X-ray spectrograph (source: the author): (a) micrograph of gypsum with policarboxylate; (b) chemical composition; (c) chemical composition of gypsum with polycarboxylate.Coatings 2021, 11,21 ofFigure 23. Evaluation area and benefits for the ��-Lapachone Activator citric acid compound with calcium sulphate, showing the common sample region and X-ray spectrograph (source: the author): (a) micrograph of gypsum with citric acid; (b) chemical composition; (c) chemical composition of gypsum with citric acid.5. Conclusions All of the bases tested improved and modified the mechanical properties (bending strength, compressive strength, and Shore C hardness) of the mortar (plaster) as in comparison to the reference without additives in the similar water/plaster (W/P) ratio, giving improved workability (higher fluidity and longer setting time). The Shore C hardness values in all tests exceeded 80 units. The Shore C hardness index values decreased considerably as we improved the proportions of additives inside the mortars. The very best mechanical resistance final results when it comes to flexural strength and compressive strength have been obtained with melamine compounds, whose values have been properly above the minimum values essential by the regulations, even though essentially the most unfavorable aspect was the setting times, which varied from three to 7 min, according to the percentage of additive utilized; around the contrary, the setting instances for the polycarboxylates, citric acid, and polycarbonate salts increased considerably, according to the proportion of your mixture, reaching values of up to 117.58 min. Both melamines and synthetic melamine polymers offered good outcomes with regards to compressive strength (99 N/mm2 ) and flexural strength (3.55.88 N/mm2 ), as did naphthalenes with regards to compressive strength (13.884.39 N/mm2 ) and bending (3.83.61 N/mm2 ). These final results were substantially larger than the rest with the test compounds. Citric acid showed stable behaviour and was close to naphthalene with regards to its compressive strength (7.93.77 N/mm2 ) and bending (3.15.83 N/mm2 ) values.Coatings 2021, 11,22 ofComparing the outcomes from the various additives utilized in these tests with other innovative additives that may be found these days on the marketplace, which include graphene powder, which is often utilized as an additive in gypsum [26], it could be observed that the bending resistance values for the additives tested were in line using the flexural resistance values, with these values becoming greater than those expected by the regulations. The setting time was inversely proportional for the mechanical resistance of your calcium sulfate additive, so by increasing the setting time the mechanical resistance with the plaster was decreased, while its values have been usually above the minimum expected by the existing regulations.Author Contributions: Conceptualization, J.A.F.Y., L.M.S.J. and J.J.P.P.; methodology, J.A.F.Y., L.M.S.J. and J.J.P.P.; software, A.M.G. in addition to a.M.C.A.; validation, J.A.F.Y., L.M.S.J. and J.J.P.P.; formal evaluation, J.A.F.Y. and L.M.S.J.; investigation, J.A.