Physical and mechanical characterization of traditional Brazilian clay bricks from different centuries

Some Engineering Properties of Ancient Fire Clay Bricks Discovered at the Dilbat Archaeological Site, South of Hilla City

“…This test depends mainly on the measurement of the length of time it takes for ultrasonic waves to travel from one point to another through a specific medium or substance (Fig. 2) (Araújo et al, 2020). The value of the longitudinal waves Vp was measured and through it the transverse waves Vs were calculated according to the equation ( 6): (Araújo et al, 2020) V s = 0.7 × V p (6) Through the relationship between the Vp &Vs, the following modulus were calculated, poisson's ratio (𝜇) as in the following equation: (Araújo et al, 2020).…”

“…2) (Araújo et al, 2020). The value of the longitudinal waves Vp was measured and through it the transverse waves Vs were calculated according to the equation ( 6): (Araújo et al, 2020) V s = 0.7 × V p (6) Through the relationship between the Vp &Vs, the following modulus were calculated, poisson's ratio (𝜇) as in the following equation: (Araújo et al, 2020).…”

“…Therefore, the compressive strength (Fc) of the bricks of the study area can be calculated according to the following equation: (Araújo et al, 2020) F c = 2.7718 × e 0.533×V p (12)…”

Fired pressed pellet as a sample preparation technique of choice for an energy dispersive X-ray fluorescence analysis of raw clays

“…The choice of clay depends on its properties and cost. Further research on raw clay for physico-mechanical and chemical properties is critical for this purpose [9][10][11]. Clays from different sources have varying properties.…”

Contribuição à análise de pastas de cal hidráulica e cal hidratada para reparos em revestimentos de fachadas de edificações históricas

“…O conhecimento dos materiais e das técnicas tradicionais envolvidos na confecção de argamassas de cal é, para Barbero-Barrera et al (2014), um dos pontos-chave para sua manutenção e conservação, considerando o reparo de revestimentos existentes e a definição de novos traços. Araújo et al (2020) explicam que conhecer os parâmetros físicos, mecânicos e de durabilidade de materiais antigos é imprescindível para se compreender o desempenho global de prédios históricos e planejar ações de manutenção e reabilitação. Quanto aos tipos de cal, a cal hidratada é composta por hidróxidos de cálcio, podendo conter também hidróxidos de magnésio e óxidos livres, e seu endurecimento é resultante da carbonatação dos hidróxidos (CINCOTTO et al, 2007).…”