EVALUATION OF THE INCORPORATION OF CHEMICAL ADMIXTURES LIME-FREE MORTARS FOR WALL COATINGS

Authors

  • Marlete Moraes UFPA
  • SHARA Portilho UFPA
  • CAROLINA C. COELHO
  • ANDRIELI MORAIS DE OLIVEIRA Universidade Federal de Goiás

Abstract

In general, it is known that the composition of mortars for wall coverings and their characteristics in the fresh state influence their rheological properties, labor productivity, service execution schedule, quality of the coating performed, durability and performance of the walls. Mortars produced with hydrated lime are more plastic, have greater water retention and have better behavior when hardened. However, in some cities like Tucuruí/PA, there is no supply of hydrated lime. So, an expectation to improve the properties of these mortars in the fresh and hardened state is the use of chemical admixtures, such as plasticizers. Thus, this work aims to evaluate of two plasticizing admixtures, commercialized in the region, in relation to the behavior in the fresh and hardened state of cement mortars for wall coverings. The results showed that the mortars with admixtures had a lower mass density and required less water to obtain the same consistency, compared to the mortar without admixtures. The water retention values were similar for the three types of mortars tested. All mortars met the minimum established for bond strength. Finally, in general, mortar with additive A had the best performance, followed by mortar without a admixtures and mortar with additive B. Correlations of properties in the hardened and fresh state were established for the tested mortars.

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Published

2023-07-01

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Artigos