Microstructural Differences in Response of Thermoresistant (Ceramic) and Standard (Granite) Concretes on Heating. Studies Using SEM and Nonstandard Approaches to Microtomography and Mercury Intrusion Porosimetry Data

Franus, Wojciech; Halicka, Anna; Lamorski, Krzysztof; Józefaciuk, Grzegorz

doi:10.3390/ma11071126

Cited by 5 publications

(5 citation statements)

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“…Cubic specimens with edge length of 10 mm were randomly cut from a rectangular specimen. The weight of the small pieces of concrete was approximately 2.5 g. Prior to the measurement, all specimens were heated overnight at 105 • C and then degassed under vacuum, which is the standard procedure in the mercury intrusion porosimetry (MIP) analysis [39]. Six samples were prepared for each type of concrete.…”

Section: Methodsmentioning

confidence: 99%

Influence of Recycled High-Performance Aggregate on Deformation and Load-Carrying Capacity of Reinforced Concrete Beams

2020

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The use of recycled concrete aggregates (RCA) in high performance concrete (HPC) was analyzed. The paper presents the experimental studies of model reinforced concrete beams with a rectangular section using high-performance recycled aggregates. Two variable contents of recycled aggregate concrete were used in this study: 50% and 100%. The experimental analyses conducted as immediate studies concerned the following issues: short time loads-deflection, load-carrying capacity of beams, deformation of concrete, cracks, and long-term loads-deflection. The comparative analysis involves the behavior of beams made of high performance concrete-high strength concrete (HPC-HSC) recycled aggregates with model control elements made of regular concrete based on natural aggregates. The deflection values for the recycled aggregate beams were 20% higher than in the case of the control beams made of HPC-HSC exclusively. Replacement of aggregate with recycled concrete aggregate resulted in a large decrease in the value of these two parameters, i.e., compression strength by about 42% and modulus of elasticity by about 33%.

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Section: Methodsmentioning

confidence: 99%

Influence of Recycled High-Performance Aggregate on Deformation and Load-Carrying Capacity of Reinforced Concrete Beams

2020

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“…This behavior of the H5S15T125 sample is explained by the evaporation of water and the chemical changes of the hydration products resulting from the temperature rise, causing an increase in the porosity and pore size of the paste [26]. Although the increase in temperature potentiates the geopolymerization effect, the rapid exudation creates a thickening of the porous structure and the mechanical strength properties end up being affected [27].…”

Section: X-ray Microtomography (µCt)mentioning

confidence: 99%

Exploratory study for the alkaline activation of basalt powder as a supplementary cementitious matrix

Gheller

Silva

Fiori

et al. 2022

Rev. IBRACON Estrut. Mater.

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resumo: Portland cement remains the main material of choice in construction due to its thermal, mechanical and durability properties. However, there is growing concern about the large amount of energy consumed and the environmental pollution generated during its production. The objective of this study, therefore, was to evaluate the potential of the fine residual material produced by crushing basalt rocks to form a supplementary cementitious matrix through alkaline activation. Basalt powder with a particle size of less than 53µm was prepared and activated with a sodium hydroxide solution, with a sodium silicate solution as an adjuvant. The curing process of the material was also carried out at 5 temperature levels, 75, 85, 100, 115, 125°C, according to the experimental design. The paste was dry curing at a standard digital laboratory oven for 24 hours. After curing, the compressive strength of the material was evaluated, reaching a mean value of 10.21 MPa for the H5S15T125 mixture at 28 days. The microstructure analysis was performed by X-ray microtomography, presenting the reconstruction of the internal pores and cracks, leading to the conclusion that higher curing temperatures formed more porous matrices, although with more strength. Based on the collected data, the statistical analysis of the design was performed showing that sodium hydroxide and temperature have a statistically significant effect on the response variable compressive strength. As such, the alkali-activation of basalt powder can potentially produce a cementitious material of moderate strength, giving purpose to the residue and reducing the emission of harmful particles into the atmosphere.

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“…O RLS não requer processamento especial para sem aplicado à produção de concreto(ZEGARDŁO; SZELĄG; OGRODNIK, 2016), sendo capaz de fornecer as propriedades do agregado convencional (GARCÍA-GONZÁLEZ et al, 2015;FRANUS, 2018;OGRODNIK, 2016). É possível utilizar o RLS em diferentes proporções de substituição dos agregados naturais e a substituição completa se mostrou viável e vantajosa tecnicamente (OGRODNIK; SZULEJ, 2018).…”

Section: Análise E Síntese Das Conclusõesunclassified

“…O surgimento de fissuras ocasionadas devido à elevação de temperatura é 30 vezes menor utilizando agregado reciclado quando comparado com agregados de granito (FRANUS et al, 2018). Concretos produzidos com cimento de alto teor de alumina e RLS possuem capacidade de trabalhar em temperaturas de até 1000°C (OGRODNIK; ZEGARDŁO; SZELĄG, 2017).…”

Section: Análise E Síntese Das Conclusõesunclassified

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Resíduos De Louça Sanitária Como Componentes De Concretos E Argamassas

Ortigara

Fontanini

2020

Encontro Nacional De Tecnologia Do Ambiente Construído

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O uso de resíduos industriais na produção de compósitos cimentícios pode apresentar vantagens, econômicas, técnicas e ambientais, o que desperta o interesse da comunidade acadêmica. Esta Revisão Sistemática da Literatura – RSL, buscou identificar as formas de reaproveitamento dos resíduos de louças sanitárias -RLS na fabricação de concretos e argamassas, de forma a categorizar os estudos já desenvolvidos, bem como identificar as principais técnicas de caracterização destes resíduos. A proposta de categorização e levantamento sistematizado de fatores oferecidos nesta pesquisa pode auxiliar a diagnosticar possibilidades de reaproveitamento dos resíduos, bem como identifica lacunas do conhecimento científico. Os resultados apontam para um baixo número de artigos publicados, porém com resultados promissores para a incorporação dos RLS nos compósitos.

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Microstructural Differences in Response of Thermoresistant (Ceramic) and Standard (Granite) Concretes on Heating. Studies Using SEM and Nonstandard Approaches to Microtomography and Mercury Intrusion Porosimetry Data

Cited by 5 publications

References 45 publications

Influence of Recycled High-Performance Aggregate on Deformation and Load-Carrying Capacity of Reinforced Concrete Beams

Influence of Recycled High-Performance Aggregate on Deformation and Load-Carrying Capacity of Reinforced Concrete Beams

Exploratory study for the alkaline activation of basalt powder as a supplementary cementitious matrix

Resíduos De Louça Sanitária Como Componentes De Concretos E Argamassas

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