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Rheological and stability analysis of cement pastes incorporating silica-based wastes

Particuology 2024年第6期89卷 144-152页

作者： Julia da Rosa Martins Janaíde Cavalcante Rocha dachamir hotza Luciano Senff Graduate Program in Materials Science and Engineering(PPGMAT) Federal University of Santa Catarina(UFSC)Florianópolis88040-900SCBrazil Graduate Program in Civil Engineering(PPGEC) Federal University of Santa Catarina(UFSC)Florianópolis88040-900SCBrazil Graduate Program in Chemical Engineering(POSENQ) Federal University of Santa Catarina(UFSC)Florianópolis88040-900SCBrazil Department of Mobility Engineering Federal University of Santa Catarina(UFSC)Joinville89219-600SCBrazil

This study investigates the influence of waste characteristics,especially zeta potential,on the properties of cement pastes and *** focus is to evaluate the impact of the zeta potential of cement particles and waste materials on the sedimentation speed,rheology,and hardening time of stabilized cement *** Cement II F 40,retarder additive,silica,and fly ash were used in the *** pastes were prepared,and during the stabilization period,their rheological properties and pH were *** zeta potential and sedimentation speed of the cement and waste particles were measured at the pH that the pastes presented during the entire stabilization *** the stabilization period,the pastes were subjected to the hardening time *** zeta potential analyses revealed diverse values for the different powder types,with the cement particles exhibiting a zeta potential of−3.0 mV,the silica particles exhibiting−10.5 mV,and the fly ash particles exhibiting−20.3 *** influence of the high zeta potential modulus was observed on the sedimentation speed,with the solution containing fly ash exhibiting a speed of 40.01μm/s,whereas the solution containing only cement exhibited a speed of 99.38μm/*** the pastes,the results indicate that the presence of fly ash particles with a significantly negative zeta potential led to a 16%reduction in hardening time compared to particles with a lower modulus of zeta *** tests showed that the inclusion of fly ash particles prevented the formation of *** the zeta potential influenced agglomerate formation and hardening time,it was found to have no effect on yield stress or viscosity.

关键词： Wastes Zeta potential Setting time Rheometry

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Multi-stage block freeze concentration via gravitational method applied to increase of the nutritional content of Morinda citrifolia ***

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Food Bioscience 2023年第1期51卷 985-994页

作者： Edipo da Silva Almeida Mateus Antonio Knapp Juliana De Gregori da Rocha dachamir hotza Debora de Oliveira Department of Chemical Engineering and Food Engineering(EQA) Federal University of Santa Catarina(UFSC)88040-970FlorianopolisSCBrazil

The processing of Morinda citrifolia fruit normally results in a large number of waste leaves that hold many bioactive compounds with nutritional and pharmacological *** work aimed to evaluate the effects of a multi-stage block freeze concentration(BFC)via gravitational method on the physicochemical properties of the leaf extract(noni tea).The results in solid retention showed fractions almost 7 times most concentrated than the initial *** addition,when compared to the initial content,the BFC process showed an efficiency higher than 90%in the retention of phenolic *** in liquid chromatography allowed the detection and quantification of phenolic compounds,in which the total amount increased by more than 1000%in relation to the initial content after each BFC ***,it was also possible to observe a significant increase in the antioxidant activity of the concentrated product after the simulated in vitro digestion *** was concluded that using a non-thermal,sustainable,low-cost processing,promoted the obtaining of concentrated fractions with high biological and nutritional values with promising properties for application in the development of functional foods from agroindustrial wastes.

关键词： Morinda citrifolia Block freeze concentration Phenolic compounds Antioxidant profile In vitro digestion Functional food

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Heteromorphic Hematite Pigments Obtained from Steel Scrap and Encapsulated in Amorphous Silica for Porcelainized Stoneware

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材料科学与工程（中英文版） 2010年第5期4卷 1-13页

作者： Viviana Possamai Della Janaina Accordi Junkes Antonio Pedro Novaes de Oliveira dachamir hotza Federal Institute of Espirito Santo-IFES Graduate Program on Metallurgical and Materials Engineering-PROPEMM Vitoria29040-780 ES Brazil Federal University of Santa Catarina-UFSC Gradttate Program on Materials Science and Engineering-PGMA T Florian6polis88040-900 SC Brazil

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