2015
DOI: 10.1590/s1678-86212015000300023
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Pozolanas de elevada reatividade: uma avaliação crítica do ensaio de Índice de Atividade Pozolânica (IAP) com cal usando Difração de Raios X

Abstract: As adições minerais pozolânicas estão presentes em grande parte dos cimentos utilizados na produção de concreto estrutural. A seleção de pozolana requer caracterização prévia de seu potencial reativo, o que é realizado, diretamente, por meio do ensaio Chapelle modificado ou, indiretamente, por meio do ensaio de resistência à compressão de argamassa com cimento Portland ou cal hidratada. O objetivo deste trabalho é quantificar o IAP com cal da cinza de casca de arroz, metacaulim e sílica ativa, além da utilizaç… Show more

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Cited by 10 publications
(4 citation statements)
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“…The results are also similar to those obtained in the literature consulted [24,25]. MEDEIROS et al [24] studied the reactivity of some materials according to the reaction and interaction with calcium hydroxide by X-ray test. These authors commented that the indirect method to assess the strength developed in mortar with lime has influenced the composition of the matrix.…”
Section: Evaluation Of Coal Fly Ash In Cementitious Matricessupporting
confidence: 85%
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“…The results are also similar to those obtained in the literature consulted [24,25]. MEDEIROS et al [24] studied the reactivity of some materials according to the reaction and interaction with calcium hydroxide by X-ray test. These authors commented that the indirect method to assess the strength developed in mortar with lime has influenced the composition of the matrix.…”
Section: Evaluation Of Coal Fly Ash In Cementitious Matricessupporting
confidence: 85%
“…The higher strength of the Metakaolin in the early ages is expected, since its higher fineness in relation to the FAMC. In addition, the higher content of aluminates justify this performance because are responsible by increase of the strength in the early ages [24] [25].…”
Section: Results Obtained With the Concretesmentioning
confidence: 99%
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“…Voglis et al [20], Antiohos et al [21], Cabral [22], Dantas [23], Picanço et al [24], Vaitkevicius et al [25], Gómez-Zamorano et al [26], AboEl-Enein et al [27] and Silva [28] also used the reasoning of comparing the intensity of peaks for studying pozzolans, as other works from the research group that created this paper also did. Publications of Gobbi [29], Raisdorfer [30], Medeiros et al [31] and Medeiros et al [32] and Hoppe Filho et al [33] are examples of this. Therefore, in this part of the study, the X-Ray Diffraction technique was applied to samples of concrete mortar and the evaluation was focused in comparing the portlandite peak intensity (located at 34,2°2h in the diffractograms).…”
Section: Study About Alkaline Reserve Using Xrdmentioning
confidence: 99%