Sistemas cimento, cinza volante e cal hidratada: mecanismo de hidratação, microestrutura e carbonatação de concreto.

Filho, Juarez Hoppe

doi:10.11606/t.3.2008.tde-19082008-172648

Cited by 7 publications

(3 citation statements)

References 10 publications

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“…The FCs used in this research have a high silica content (22.9%) (Table 1), not commonly found in lignocellulosic fibers. Silica accelerates the hydration rate of C3S [50], which corroborates the increase in maximum temperatures of cementitious pastes with the addition of FCs.…”

Section: Monitoring Initial Hydration Reaction Of Cement Compositesupporting

confidence: 74%

Effect of combined fiber-microcrystalline cellulose reinforcement on the rheology and hydration kinetics of cementitious composites

Bilcati,

Costa,

Tamura

2024

Rev. IBRACON Estrut. Mater.

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The influence of the combined addition of cellulose fibers (FC) and microcrystalline celluloses (MCC) on the fresh properties and hydration kinetics of cementitious composites was investigated. For this purpose, sixteen different formulations of FC-MCC celluloses in the cement matrix were analyzed, in which various cellulose fibers were 0.5%, 1.0%, and 1.5% and microcrystalline cellulose in 0.4%, 0.6% and 0.8% about the cement mass. The cementitious composites with the addition of FC-MCC celluloses were characterized in terms of rheological behavior, which was determined through the Squeeze flow method, fluidity through the mini-slump test, and hydration kinetics determined through the temporal evolution of the temperature of the mixtures. The initial hydration tests showed that the maximum addition of MCC (0.8%) used in this work reduced the maximum temperature of the cementitious composites, as well as the combination of FCs with MCC 0.8. Cellulose fibers took a longer time to reach the maximum temperature. The combined contents of FC 1.0-MCC 0.4 and FC 0.5-MCC 0.6 promoted an increase in the maximum temperature, which could indicate a dispersive effect of the cellulose particles with the cementitious system. The results of the compression flow showed that the studied samples presented a flow with very low loads and extended for a large part of the curve. Te increase in the amount of cellulose fiber alters the main phenomena related to flow: with a high cellulose content (FC 1.5%) there is an increase in friction between the particles, leading to the conclusion that the amount of cellulose fibers in the cementitious system influences on the rheological behavior and the occurrence of phase separation.

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Section: Monitoring Initial Hydration Reaction Of Cement Compositesupporting

confidence: 74%

Effect of combined fiber-microcrystalline cellulose reinforcement on the rheology and hydration kinetics of cementitious composites

Bilcati,

Costa,

Tamura

2024

Rev. IBRACON Estrut. Mater.

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“…It was used the same mass (around 30 mg) for all samples, in order to reduce inaccurate results from heterogeneous mass quantity [30,31]. Two sub-samples were used per treatment.…”

Section: Thermogravimetric Analysis (Tga)mentioning

confidence: 99%

Rationalizing the impact of aging on fiber–matrix interface and stability of cement-based composites submitted to carbonation at early ages

et al. 2016

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The objective of this work is to show the effect of carbonation at early stages on fiber-cement composites and impact on hydration, chemical and dimension stability. Carbonation increased the content of CaCO 3 polymorphs and consumed Ca(OH) 2 and other hydrated calcium phases. Micrographs and energydispersive spectrometry showed the CaCO 3 formed is precipitated in the pore structure of the matrix, decreasing diffusion of Si, S, and Al during hydration. Therefore, a refining process of pore sizes is produced, and fiber-matrix interface in carbonated composites was improved, leading to volume stabilization of the composite, as indicated by lower drying shrinkage and lower porosity.

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“…A carbonatação é a capacidade do gás carbônico (CO2) que se encontra na atmosfera e adentra os poros do concreto, podendo atingir a armadura e danificá-la (Hoppe Filho, 2008).…”

Section: Carbonataçãounclassified

Análise de manifestações patológicas em estruturas de concreto armado: uma revisão

Morais

Silva

Barboza

et al. 2020

RSD

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The term pathology addressed in civil engineering comprises the study of the origin, treatment of building problems, representing aesthetic damage, reduction of building performance, and may impair the functionality of the building or its subsystems. Damage to reinforced concrete structures can be avoided even in the projects phase, several works present problems with pathological manifestations, problems that can be very costly their recovery. In this context, this article aims through a literature review study to analyze the main pathological incidences in reinforced concrete structures, in addition to proposing practical solutions to the problems, answers presented by the authors of the respective works of the case studies analyzed. This work was based on papers from the Google Acadêmico scientific literature database, totaling 15 studies, using the publications from January 2009 to January 2020, having the following keywords: Pathology of buildings, pathological analysis, civil construction, reinforced concrete and higher incidences. Through the literature addressed, it was possible to verify that of the pathologies analyzed, the most frequent is corrosion of the reinforcement, being present 100% of the studies analyzed and then stand out the incidences of pathologies of the type fissure and spots, with 73% and 60%, respectively. It was verified that the cracks represent 53% of the pathological manifestations found in the works; Eflorescencia (47%); Buckling (27%) and Carbonation (20%).

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Sistemas cimento, cinza volante e cal hidratada: mecanismo de hidratação, microestrutura e carbonatação de concreto.

Cited by 7 publications

References 10 publications

Effect of combined fiber-microcrystalline cellulose reinforcement on the rheology and hydration kinetics of cementitious composites

Effect of combined fiber-microcrystalline cellulose reinforcement on the rheology and hydration kinetics of cementitious composites

Rationalizing the impact of aging on fiber–matrix interface and stability of cement-based composites submitted to carbonation at early ages

Análise de manifestações patológicas em estruturas de concreto armado: uma revisão

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