Affiliation:
1. Federal University of Bahia
2. Universidade Federal de São Carlos-SP
Abstract
This paper evaluates the effect of grinding dust (GD), a waste generated in the clutch disc finishing process, on Portland cement hydration. For this, pastes with additions of 5%, 10% and 15% GD, relative to cement weight, were molded and compared with a reference sample. Tests of setting time determination by Vicat needle, calorimetry, monitoring the ultrasonic pulse propagation velocity and mineralogical analysis (X-ray diffraction) in pastes with 1 day of hydration were carried out. It was observed that GD, due to the presence of copper, zinc and phenolic resin in its composition, is responsible for retarding cement hydration and thus increases the setting time and delays the evolution of heat release and pulse propagation velocity. However, the formation of new crystalline phases was not observed.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Reference10 articles.
1. MARIANO, R. D.; RIBEIRO, D. V. Utilização do pó de retifica como retardador de pega no cimento e avaliação das propriedades de argamassas no estado endurecido. Proceedings of 57° Congresso Brasileiro do Concreto. Bonito, Brazil, (2015).
2. ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS (ABNT). Cimento Portland – Determinação do tempo de pega. - NBR NM 65, Rio de Janeiro, Brazil, (2003).
3. SILVA, E.F. Variações dimensionais em concretos de alta resistência contendo aditivo redutor de retração. 2007. 332 p. Thesis (Doctorate) – COPPE, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil, (2007).
4. TASHIRO, C.; TATIBANA, S. Bond strength between C3S paste and iron, copper or zinc wire and microstructure of interface. Cem. Concr. Res., v. 13, pp.377-382, (1983).
5. ARLIGUIE, G.; GRANDET, J. Etude de l'effet retardateur du zinc sur l'hydratation de la pate de ciment Portland. Cem. Concr. Res., v.12, pp.79-86, (1982).