Estudo da influência dos aditivos redutores de água de bases químicas distintas no comportamento de pastas de cimento Portland no estado fresco

Resumo: O tempo de início de pega e a perda de abatimento das pastas de cimento Portland sofrem influência do tipo de aditivo redutor de água utilizado na mistura. Neste trabalho, foi verificada a influência dos aditivos químicos redutores de água dos tipos 1 e 2, quanto à cinética de Leia mais…

Gestão de restrições e monitoramento remoto de obras com imagens 360º = Restrictions management and remote monitoring of works with 360º Images

Resumo: TNos últimos anos, a construção civil vem passando por uma transformação digital, visando processos mais eficientes e colaborativos dentro e fora do canteiro de obras. O Last Planner System (LPS), sistema com origem na filosofia lean construction, é uma abordagem que se destaca por eliminar restrições e gargalos, bem Leia mais…

Implementation of a millimeter-wave butler matrix on metallic nanowires-filled membrane platform

Abstract: Wireless communications with greater transmission capacities are possible in the millimeter wave (mmWave) region. However, to overcome the significant propagation losses in this frequency band, it is necessary to employ more efficient and intelligent antennas based on MIMO and beam-steering phased array technologies. This paper demonstrates the fabrication of Leia mais…

Cross-linked whole cerlls for the sucrose transfructosylation reaction in a continuous reactor

Abstract: Fructooligosaccharides (FOS) are fructose oligomers beneficial to human health and nutrition for prebiotic sugars. Their production occurs by a transfructosylation reaction in sucrose molecules catalyzed by fructosyltransferase enzymes (FTase, E.C.2.4.1.9) adhered to microbial cells. The purpose of this work was to study the preparation, enzymatic activity, and stability of Leia mais…

Thermoactivated cement from construction and demolition waste for pavement base stabilization: a case study in Brazil

Abstract: Construction and demolition waste (CDW) worldwide generation accounts 10billion tonnes yearly. The major fraction is landfilled requiring innovative recycling methods to reduce the associated environmental impacts and to increase its circularity. Our study demonstrated the feasibility of using different CDW fines to develop recycled cements and optimized the content Leia mais…

High activity pozzolan obtained from selection of excavation soils in a construction and demolition waste landfil

Abstract: Excavations soils from construction sites, when included as Construction and Demolition Waste (CDW) can double waste amount and represent up to 80 % of waste composition. Limited recycling strategies are available for the material. In this work, soils with higher kaolinite contents were selected by X-ray diffraction (XRD) to Leia mais…

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