Evaluación de aditivos y fibras sintéticas en la mitigación del mapeo en revoques interiores del proyecto Amantina Etapa 2, Itagüí.

Abstract

Cement-based renders are essential components for the protection, durability, and aesthetic performance of buildings. However, they frequently exhibit map cracking (crazing), a superficial cracking pattern caused by plastic, hydraulic, and thermal shrinkage processes. These mechanisms generate microcracks that adversely affect the adhesion and long-term durability of the finish. In the Amantina Stage 2 project, located in Itagüí, Antioquia, Colombia, this pathology was identified on the interior walls of Floors 1, 2, 3, 4, and 5. This study aims to experimentally verify the effectiveness of plasticizing admixtures, water-retaining agents, and synthetic fibers in mitigating map cracking and improving the durability of interior cement renders. A quantitative and experimental methodology will be adopted, involving the application of five mortar treatments (one control mix and four modified mixes) under actual construction site conditions. The variables to be evaluated include crack density and crack width, bond strength using the pull-off test, and capillary water absorption using the Karsten tube test. The results are expected to establish technical criteria for mix design and application procedures that reduce surface cracking and enhance the performance of cement renders in buildings exposed to similar climatic and construction conditions.