INFLUÊNCIA DA INCORPORAÇÃO DE VINHAÇA NAS PROPRIEDADES DE COMPÓSITOS CIMENTÍCIOS NO ESTADO FRESCO
Keywords:
tempo de pega, vinhaça, calorimetriaAbstract
Tension and compression stresses are introduced in the concrete when Portland Cement are used in large volumes, inducing pathologies such as micro-cracks related to sudden changes in temperature. Sucrose is used as a cement hydration retarding additive and produce good results. In this sense, vinasse is a source of sucrose still little explored. Vinasse is a by-product of the sugar and alcohol industry, produced in large volumes, making it very attractive in this application. This study investigates the influence of vinasse on hydration in cement pastes. The total reducing sugars (TRS) and total soluble sugars (AST) as well as the sucrose present in vinasse was determined through Fehling method. The amount of 25%, 50% and 100% of vinasse were used to substitute water in cement pastes composition. The consistency, initial and final setting time and thermal variation during hydration of pastes were. The results show that the lower amount of substitution (25%) leads to an increase in the initial and final setting time, while larger amounts did not cause the same benefits. The calorimetry test confirmed the results obtained by the setting time test, showing less heat of hydration of the paste with 25% substitution of water for vinasse.
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References
ABNT. NBR 16606: Cimento Portland — Determinação da pasta de consistência normal. Rio de Janeiro: ABNT, 2018a.
ABNT. NBR 16607: Cimento Portland — Determinação dos tempos de pega. Rio de Janeiro: ABNT, 2018b.
AHMAD, S.; LAWAN, A.; AL-OSTA, M. Effect of sugar dosage on setting time, microstructure and strength of Type I and Type V Portland cements. Case Studies in Construction Materials, v. 13, p. e00364, dez. 2020. https://doi.org/10.1016/j.cscm.2020.e00364
AMBROZEWICZ, P. H. L. Materiais de Construção Civil: Normas, especificações, aplicação e ensaios de laboratório. São Paulo: PINI, 2012.
ARAÚJO, J. M. Tensões térmicas em blocos de concreto armado. Teoria e Prática na Engenharia Civil, v. 22, p. 1–14, 2013.
ASSI, L. N.; DEAVER, E. (EDDIE); ZIEHL, P. Using sucrose for improvement of initial and final setting times of silica fume-based activating solution of fly ash geopolymer concrete. Construction and Building Materials, v. 191, p. 47–55, dez. 2018. https://doi.org/10.1016/j.conbuildmat.2018.09.199
IAL, I. A. L. Métodos físico-químicos para análise de alimentos. São Paulo, Brasil: [s.n.]. v. 4
JAMIL, N. N. B. The effect of natural retarder on geopolymer concrete with different curing regime. [s.l.] Universiti Teknologi Petronas, 2010.
JUMADURDIYEV, A. et al. The utilization of beet molasses as a retarding and water-reducing admixture for concrete. Cement and Concrete Research, v. 35, n. 5, p. 874–882, maio 2005. https://doi.org/10.1016/j.cemconres.2004.04.036
KUMAR, M.; SINGH, S. K.; SINGH, N. P. Heat evolution during the hydration of Portland cement in the presence of fly ash, calcium hydroxide and super plasticizer. Thermochimica Acta, v. 548, p. 27–32, nov. 2012. https://doi.org/10.1016/j.tca.2012.08.028
KUSBIANTORO, A. et al. Development of Sucrose and Citric Acid as the Natural based Admixture for Fly Ash based Geopolymer. Procedia Environmental Sciences, v. 17, p. 596–602, 2013. https://doi.org/10.1016/j.proenv.2013.02.075
LEME FILHO, J. R. A. Estudo comparativo dos métodos de determinação e de estimativa dos teores de fibra e de açúcares redutores em cana-de-açúcar (Saccharum spp.). Piracicaba: Universidade de São Paulo, 2005.
LEONHARDT, F.; MONNIG, E. Construções de concreto - volume 1: princípios básicos do dimensionamento de estruturas de concreto armado. Rio de Janeiro: Editora Interciência, 1977.
NEVILLE, A. M. Propriedades do concreto. Porto Alegre: Bookman, 2016.
RATTANASAK, U.; PANKHET, K.; CHINDAPRASIRT, P. Effect of chemical admixtures on properties of high-calcium fly ash geopolymer. International Journal of Minerals, Metallurgy, and Materials, v. 18, n. 3, p. 364–369, 29 jun. 2011. https://doi.org/10.1007/s12613-011-0448-3
SOTOLONGO, R.; GAYOSO, R.; GÁLVEZ, M. Contribución al estudio de la sacarosa como aditivo retardador de la hidratación del cemento. Materiales de Construcción, v. 43, n. 230, p. 37–39, 30 jun. 1993. https://doi.org/10.3989/mc.1993.v43.i230.682
VALIN JR, M. DE O. et al. Influência de diferentes climas urbanos na qualidade do concreto. Revista Engenharia e Construção Civil, v. 3, p. 40–54, 2016.
VIECILI, M. J. C.; HASTENPFLUG, D.; GIRARDI, R. Comparativo entre o teste de Vicat e a calorimetria semi-adiabática para determinação do tempo de início e fim de pega em cimentos Portland. Matéria (Rio de Janeiro), v. 23, n. 3, 18 out. 2018. https://doi.org/10.1590/s1517-707620180003.0506