Zobrazeno 1 - 10
of 206
pro vyhledávání: '"Paulo J M Monteiro"'
Publikováno v:
IET Microwaves, Antennas & Propagation, Vol 16, Iss 10, Pp 627-638 (2022)
Abstract In an urban built city environment, the performance of electromagnetic (EM) wave propagation through building materials poses a new set of challenges to radio frequency engineers in the prediction of the 5G‐network coverage planning. We pr
Externí odkaz:
https://doaj.org/article/35c1c38be6844ad2b6b4d61e33ccbd01
Publikováno v:
Sensors, Vol 23, Iss 20, p 8624 (2023)
Recent advances in embedded antenna and sensor technologies for 5G communications have galvanized a response toward the investigation of their electromagnetic performance for urban contexts and civil engineering applications. This article quantitativ
Externí odkaz:
https://doaj.org/article/aee9d417b24f4920999cc14605204e20
Publikováno v:
Environmental Research Communications, Vol 5, Iss 5, p 055002 (2023)
Decarbonization of the cement and concrete industries is one of the top priorities on the path to a carbon-neutral economy. This article presents a novel model for evaluating the emissions from the production of metakaolin (MK) as a supplementary cem
Externí odkaz:
https://doaj.org/article/85cd1525cb0144689e235dd00da9e2a1
Autor:
Ana Paula Kirchheim, Erich D. Rodríguez, Rupert J. Myers, Luciano A. Gobbo, Paulo J. M. Monteiro, Denise C. C. Dal Molin, Rui B. de Souza, Maria Alba Cincotto
Publikováno v:
Materials, Vol 11, Iss 4, p 568 (2018)
The tricalcium aluminate (C3A) and sulfate content in cement influence the hydration chemistry, setting time and rheology of cement paste, mortar and concrete. Here, in situ experiments are performed to better understand the effect of gypsum on the e
Externí odkaz:
https://doaj.org/article/9f2fe4935b664e4e8d884e5db07b82ad
Autor:
Francieli Tiecher, Marcia E. B. Gomes, Denise C. C. Dal Molin, Nicole P. Hasparyk, Paulo J. M. Monteiro
Publikováno v:
Materials, Vol 10, Iss 9, p 1022 (2017)
This paper presents research on the influence of quartz deformation in aggregates for the development of the alkali-silica reaction in concrete and its relationship with silica dissolution. The study also compares these characteristics with the field
Externí odkaz:
https://doaj.org/article/8710d7f5fb6f4e86a44f30488207ff92
Publikováno v:
Materials, Vol 10, Iss 2, p 131 (2017)
This study assesses the quantitative effects of incorporating high-volume fly ash (HVFA) into tricalcium silicate (C3S) paste on the hydration, degree of silicate polymerization, and Al substitution for Si in calcium silicate hydrate (C–S–H). The
Externí odkaz:
https://doaj.org/article/f8e6fd788e3a4d6b9b361aa6e91bade7
Autor:
Vanessa Rheinheimer, Cise Unluer, Jiawei Liu, Shaoqin Ruan, Jisheng Pan, Paulo J. M. Monteiro
Publikováno v:
Materials, Vol 10, Iss 1, p 75 (2017)
MgO cements have great potential for carbon sequestration as they have the ability to carbonate and gain strength over time. The hydration of reactive MgO occurs at a similar rate as ordinary Portland cement (PC) and forms brucite (Mg(OH)2, magnesium
Externí odkaz:
https://doaj.org/article/5511242ef42d473099428e628dd57e58
Autor:
Sungchul Bae, Manabu Kanematsu, Daniel Hernández-Cruz, Juhyuk Moon, David Kilcoyne, Paulo J. M. Monteiro
Publikováno v:
Materials, Vol 9, Iss 12, p 976 (2016)
The understanding and control of early hydration of tricalcium silicate (C3S) is of great importance to cement science and concrete technology. However, traditional characterization methods are incapable of providing morphological and spectroscopic i
Externí odkaz:
https://doaj.org/article/378e8d32ce0942bb9eaebf4da7be5586
Autor:
Vanessa Rheinheimer, Sejung Rosie Chae, Erich D. Rodríguez, Guoqing Geng, Ana Paula Kirchheim, Paulo J. M. Monteiro
Publikováno v:
Materials, Vol 9, Iss 9, p 745 (2016)
This paper shows the microstructural differences and phase characterization of pure phases and hydrated products of the cubic and orthorhombic (Na-doped) polymorphs of tricalcium aluminate (C3A), which are commonly found in traditional Portland cemen
Externí odkaz:
https://doaj.org/article/036fc28ff2474e509cf248ff9941b199
Publikováno v:
Environmental Research Letters, Vol 11, Iss 7, p 074029 (2016)
Due to its prevalence in modern infrastructure, concrete is experiencing the most rapid increase in consumption among globally common structural materials; however, the production of concrete results in approximately 8.6% of all anthropogenic CO _2 e
Externí odkaz:
https://doaj.org/article/36d467e664d545f2810b6679065c9815