Comparative study between the individual, dual and triple addition of (SF), (TGP) and (PVA) for improving Local Plaster of Paris (LPOP) properties

A comparative study has been carried out in the current work to investigate the influence of three additives [ namely ; Polyvinyl Acetate (PVA), Tree Glue Powder (TGP) and Silica Fume (SF)] on two fundamental characteristics of Local Plaster of Paris (LPOP) (namely; Setting Time and Compressive Strength) in order to enhance both of them (together). This target had been achieved firstly; by adding each additive individually, secondly; by adding each one of them with another one (dually), and thirdly; by adding all of them together (triple addition). The experimental work contains preparing eight LPOP mixtures based on the weighted content of those additives (1.0% for TGP, 4.0% for PVA and 1.2% for SF) as well as the reference mixture (i.e. a mixture free of additives). All the aforementioned mixtures had a (Water / Plaster = 0.5). It was found that; adding each additive individually, enhances one of the aforementioned characteristics and decrease the other, whereas adding two of them dually, was found either to significantly enhance one characteristic and mitigate the decreasing in the other, or slightly enhance one of them. Finally, It was also found that adding all the three additives together, gives the optimum enhancement for both characteristics together (precisely: 23.8% for the compressive strength and310.4% for the setting time)..