Comparative evaluation of surface hardness and compressive strength of type iii gypsum after addition of 2% GUM Arabic and 0.2% Calcium hydroxide

Objective: The objective of this study is to compare & evaluate surface hardness and compressive strength of type III gypsum product after addition of 2% Gum Arabic and 0.2% Calcium Hydroxide. Method: For the study, 80 samples were poured out of which 20 were poured with type III gypsum, 20 were poured with type III gypsum and 2% Gum Arabic, 20 were poured with type III gypsum and 0.2% Calcium hydroxide and remaining 20 were poured with 2% Gum Arabic and 0.2% Calcium Hydroxide. 40 samples were tested for surface hardness and remaining 40 for compressive strength. Obtained values were then tabulated, compared and subjected for statistical analysis. Results: Highest compressive strength was seen in samples with no additives. Surface hardness was increased after the addition of additives. Conclusion: There was no effect of Gum Arabic and Calcium Hydroxide on compressive strength of Type III gypsum. Surface hardness was increased after the addition of additives. Highest values were obtained for surface hardness after addition of Gum Arabic and Calcium Hydroxide.