Drying parameters of rendering mortars

Abstract

The objective of this article was to study the drying behavior of rendering mortars. Cement-lime mortars with different mix proportions were evaluatedto analyze the influence of mix materials on water transport. The experimental program was produced to observe the transport of liquid water and vapor water in mortars during the drying process. The liquid water transport was studied through capillary absorption and the water vapor transport by the water vapor permeability test. The drying curves used to investigate drying kinetics were obtained according to the methodology recommended by European standard EN 16322. In summary, it is possible to affirm that the aggregate, the binder and water contents determine the behavior of the mortars regarding water transport. The drying index is considered a good indicator of the easiness of both liquid and vapor water transport.

Effect of Type of Curing and Metakaolin Replacement on Air Lime Mortars for the Durability of Masonries

“…Is important to know how mortars lose the water that they have absorbed to better understand their future performance in terms of durability. A high drying capacity can improve a mortar's durability, avoid the appearance of fungi [44] and contribute to salts' transport to the surface. The drying curves of phase 1 and phase 2 at 28, 90 and 180 days, are presented in Figure 10.…”

Avaliação do comportamento de estanqueidade à água de argamassas e hidrorrepelentes – Parte II

“…Na Tabela 8 apresentam-se os resultados de outros autores para o ensaio de absorção de água por capilaridade para argamassas, contudo, como já destacado, os revestimentos avaliados são diferentes aos utilizados neste estudo. Destaca-se Salomão et al [29] que utilizaram argamassas que absorveram mais água em um intervalo de tempo, chegando a 14,6 g/dm².min 1/2 . Resultado mais alto em relação aos deste estudo onde o coeficiente de capilaridade variou de 0,15 a 2,38 g/dm².min 1/2 (Tabela 6), demonstrando baixa absorção.…”

Drying Process of Cement Mortar Composites Reinforced with Cellulosic Fibres: Experiment and Mathematical Modelling

“…However, the water flow through the mortar pores can also indicate greater ease of degradation. 5 The study of the interaction between water and solid, in particular during the drying process, is one of the keys for durability studies of cement products.…”

“…At this stage, the drying front is inside the material and no longer on its surface, so the vapour diffusion from the interior to the surface of the material is increased. 5 Drying process of cement-based porous materials is required to investigate their microstructure, strength, and drying characteristics. Moreover, clarifying the kinetics of drying is desirable for optimising the drying process, which is significant for engineering, managing waste to obtain ecological material, and developing new drying devices.…”