Comparison of the performance of plaster and lime in building coatings

Abstract

In this study, gypsum and lime were used as alternative coating materials in construction, with the aim of comparing the performance of gypsum and lime in construction coatings by evaluating their compressive strength, degree of absorption, and specific weight in addition proportions of 16%, 22%, 50% and 70%. This objective was achieved by following an applied, experimental methodology with a quantitative approach, aimed at comparing the performance of plaster and lime as binders in construction coatings, in proportions of 16%, 22%, 50%, and 70%. Forty cylindrical mortar specimens were prepared, divided equally between mixtures with lime and gypsum. The samples were cured for 7, 14, and 28 days and subjected to compressive strength, absorption rate, and specific weight tests, carried out in the laboratory of the Universidad Privada del Norte. The results showed that maximum compressive strength was obtained with 16% gypsum (4,245 kg/cm2) and 16% lime (5,337 kg/cm2), demonstrating that intermediate percentages optimize structural performance. In terms of absorption, lime mortars had values between 16.67% and 23.00%, and gypsum mortars between 16.38% and 24.04%, demonstrating that lime offers greater stability against moisture. Finally, it is concluded that lime is more suitable for exterior coatings, while gypsum is appropriate for dry interiors due to its better workability and surface finish.