Evaluating residual properties of thermally damaged concrete

Biolzi, Luigi; Cattaneo, Sara; Rosati, Gianpaolo

doi:10.1016/j.cemconcomp.2008.09.005

Cited by 97 publications

(35 citation statements)

References 10 publications

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“…This situation is valid for all studied specimen sizes. Normally, it is expected that the risk of explosive spalling must be increased with the increase of specimen size due to the heat and moisture transport through the specimen [11,12,23]. The microstructure of the tested specimen controls the water expulsion from the concrete at normal as well as at high temperature.…”

Section: Surface Characteristics and Spalling Of Heat Treated Ecc Spementioning

confidence: 99%

“…A review of the literature also showed that the risk of explosive thermal spalling increases with the increase in specimen size. This is due to the fact that specimen size has a direct effect on the rate of heat and moisture loss and the moisture content at the time of testing [11,12]. For example, a smaller size specimen provides a shorter path for moisture to escape during the fire test, thereby reducing spalling forces Therefore, careful consideration must be given to the size of specimens when evaluating the high temperature resistance and spalling behavior of cement-based composites.…”

Section: Introductionmentioning

confidence: 99%

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Specimen size effect on the residual properties of engineered cementitious composites subjected to high temperatures

Erdem

2014

Cement and Concrete Composites

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a b s t r a c tIn this study, size effect on the residual properties of Engineered Cementitious Composites (ECC) was investigated on the specimens exposed to high temperatures up to 800°C. Cylindrical specimens having different sizes were produced with a standard ECC mixture. Changes in pore structure, residual compressive strength and stress-strain curves due to high temperatures were determined after air cooling. Experimental results indicate that despite the increase of specimen size, no explosive spalling occurred in any of the specimens during the high temperature exposure. Increasing the specimen size and exposure temperature decreased the compressive strength and stiffness. Percent reduction in compressive strength and stiffness due to high temperature was similar for all specimen sizes.

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Section: Surface Characteristics and Spalling Of Heat Treated Ecc Spementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Specimen size effect on the residual properties of engineered cementitious composites subjected to high temperatures

Erdem

2014

Cement and Concrete Composites

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“…Visual inspection of colour change of heated gives an idea of the modification in the properties of concrete [28] and shown in Fig. 5 are the concrete specimens and their respective colour change after heating.…”

Section: Results and Analysis 61 Colour Change Of Heated Concretementioning

confidence: 99%

“…For comparison purpose with the other heated specimens, one specimen was left unheated. The concrete specimens were then scanned immediately after cooling the same way as prior to heating since heated concrete undergoes the re-hydration processes [28].…”

Section: Heating Exposure Techniquementioning

confidence: 99%

A non-destructive technique for health assessment of fire-damaged concrete elements using terrestrial laser scanning

Mukupa

Roberts

Hancock

et al. 2016

J Civil Struct Health Monit

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“…Já as alterações físicas são promovidas pelo aparecimento de fissuras e a ocorrência do desplacamento do material. [7,8].…”

Section: Introductionunclassified

Avaliação da resistência residual de lajes alveolares em concreto armado em uma edificação industrial após incêndio

et al. 2017

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RESUMOO concreto, durante exposição a elevadas temperaturas, caracteriza-se pela baixa difusividade térmica e incombustibilidade, resultando em desempenho satisfatório frente ao fogo. Todavia, constatam-se transformações químicas e físicas em seus componentes. A estabilidade do composto relaciona-se com a microestrutura, portanto consegue-se verificar a degradação do material através de técnicas avançadas de análise microestrutural. Neste contexto, o uso de ensaios no material, como a difratometria e fluorescência de raios X, mostrase atraente. Neste artigo, é descrita a inspeção de laje alveolar pré-fabricada de uma edificação industrial, a qual sofreu exposição às altas temperaturas provindas de um incêndio no subsolo da edificação. Avaliou-se o elemento estrutural através de ensaios de caracterização química, em diferentes espessuras da laje de concreto, estimando a temperatura alcançada em cada camada e, consequentemente, a perda de resistência do elemento estrutural. A partir dos resultados, constatou-se a temperatura de, aproximadamente, 700 ºC na superfície da laje e menos de 100 ºC nas camadas mais profundas. Estimou-se a redução na resistência à compressão do concreto na ordem de 25 % na camada de 20 mm e redução praticamente desprezável na região dos fios protendidos, atestando a segurança estrutural da estrutura após o sinistro. Palavras-chave:Concreto. Altas temperaturas. Resistência residual. Difração por raios-x. Fluorescência de raios x. ABSTRACTConcrete, during exposure to elevated temperatures, is characterized by low thermal diffusivity and incombustibility, resulting a satisfactory performance against fire. However, chemical and physical changes occur in its components. The stability of the compound relates to its microstructure, so it is possible to verify the material degradation using advanced techniques of microstructural analyses. In this context, the use of mate-

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Evaluating residual properties of thermally damaged concrete

Cited by 97 publications

References 10 publications

Specimen size effect on the residual properties of engineered cementitious composites subjected to high temperatures

Specimen size effect on the residual properties of engineered cementitious composites subjected to high temperatures

A non-destructive technique for health assessment of fire-damaged concrete elements using terrestrial laser scanning

Avaliação da resistência residual de lajes alveolares em concreto armado em uma edificação industrial após incêndio

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