Dustiness evaluation in different mortars with thermal cure

• Published in: Journal of building pathology and rehabilitation 2024-12, Vol.9 (2), Article 137
• Main Authors: Souza, Alessandra Tolentino, Silveira Neto, Henrique, da Silva Neto, Gilberto Alves, Caldas, Rodrigo Barreto, dos Santos, White José
• Format: Article
• Language: English
• Subjects: Building Materials; Building Repair and Maintenance; Energy Efficiency; Engineering; Engineering Thermodynamics; Heat and Mass Transfer; Research Article; Structural Materials
• ISSN: 2365-3159; 2365-3167
• DOI: 10.1007/s41024-024-00484-6

Most pathological manifestations are associated with problems in the choice and proportions of materials and difficulty in measuring the effects of climate, substrate characteristics, and application conditions on the properties of coating mortars. The effect is various pathological manifestations in mortars: cracks due to retraction, dustiness, and local and generalized detachment. There is no standard to specify these characteristics, making it impossible to compare types of mortar. This paper proposes a quantitative method for dustiness tests in different mortars (gauged and with chemical admixture), in addition to considering a thermal cure to stimulate the appearance of pathological manifestations. Two proportions of mortars with hydraulic lime and 10 with admixture (plasticizer, water retainer, and air entrainer) were evaluated with cure at a high temperature (40 °C). From the results, it is noticeable that the variation of mixtures with hydraulic lime and chemical admixtures led to considerable changes in the dustiness value, ultimately generating detachment. It is concluded that a greater water retention capacity of the mortar (hydraulic lime or water-retaining admixture) can reduce the harmful effects of accelerated drying. The proposed methods tend to be a good approximation of the values and allow quantitative measurement of the dustiness of the coating mortars.