Compressive strength and pore structure of high-performance concrete after exposure to high temperature up to 800°C

Chan, Yukkwan; Luo, Xu; Sun, Wei

doi:10.1016/s0008-8846(99)00240-9

Cited by 285 publications

(118 citation statements)

References 12 publications

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“…The results given in Fig. 2, confirm the coarsening effect of high temperatures on the pore structure reported previously [16][17][18]. Fig.…”

Section: Pore Structure Characterization Of Heat Treated Ecc Specimenssupporting

confidence: 89%

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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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“…The results given in Fig. 2, confirm the coarsening effect of high temperatures on the pore structure reported previously [16][17][18]. Fig.…”

Section: Pore Structure Characterization Of Heat Treated Ecc Specimenssupporting

confidence: 89%

“…Mechanical properties of a material are strongly related to its microstructure. Therefore, to a certain degree, the variation of pore structure reflects the deterioration of concrete subjected to high temperature [17]. The results given in Fig.…”

Section: Pore Structure Characterization Of Heat Treated Ecc Specimensmentioning

confidence: 94%

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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“…However, it is important to note that the residual strengths of the concretes assessed here are just 10% lower than those reported for high performance Portland cement concrete reinforced with steel and polypropylene fibres after exposure to 800 ºC (43), where improved dimensional and mechanical stability of the specimens is expected to result from the inclusion of fibres. This highlights the relatively good stability at high temperatures of concretes based on alkali-activated binders, compared to concrete materials in general.…”

Section: Relación Escoria/ (Escoria+metacaolín) / Slag/(slag+metakaolcontrasting

confidence: 57%

Desempeño a temperaturas altas de morteros y hormigones basados en mezclas de escoria/metacaolín activadas alcalinamente

Bernal

Gutiérrez²,

Ruiz³

et al. 2012

Mater. construcc.

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RESUMENEste artículo evalúa el desempeño de morteros y hormigones basados en mezclas de escoria siderúrgica (GBFS)/metacaolín (MK), activadas alcalinamente expuestos a temperaturas altas. Se identifica una elevada estabilidad en morteros con contenidos de MK de hasta un 60% cuando se exponen a temperaturas de 600 ºC, con una resistencia residual de 20 MPa posterior a la exposición a esta temperatura. Por otra parte, la exposición a temperaturas más elevadas conduce al agrietamiento de los hormigones como consecuencia de una elevada contracción de la matriz cementante y las restricciones por efecto de los áridos, especialmente en aquellos especímenes con cementantes que contienen altos contenidos de MK. Se identifican diferencias significativas en las propiedades de absorción de agua de morteros y hormigones, y esto se relaciona con las divergencias en el desempeño de estos materiales posterior a la exposición a temperaturas altas. Esto indica que el desempeño a temperaturas elevadas de morteros de activación alcalina no es completamente transferible a hormigones, ya que los sistemas difieren en permeabilidad. Las diferencias en los coeficientes de expansión térmica entre matriz cementante y los áridos gruesos contribuyen al macrofisuramiento del material y su consecuente reducción de propiedades mecánicas.Palabras claves: cementos alcalinos, altas temperaturas, escoria siderúrgica, metacaolín, propiedades mecánicas. SUMMARYThis paper assesses the performance of mortars and concretes based on alkali activated granulated blastfurnace slag (GBFS)/metakaolin (MK) blends when exposed to high temperatures. High stability of mortars with contents of MK up to 60 wt.% when exposed to 600°C is identified, with residual strengths of 20 MPa following exposure to this temperature. On the other hand, exposure to higher temperatures leads to cracking of the concretes, as a consequence of the high shrinkage of the binder matrix and the restraining effects of the aggregate, especially in those specimens with binders containing high MK content. A significant difference is identified between the water absorption properties of mortars and concretes, and this is able to be correlated with divergences in their performance after exposure to high temperatures. This indicates that the performance at high temperatures of alkali-activated mortars is not completely transferable to concrete, because the systems differ in permeability. The differences in the thermal expansion coefficients between the binder matrix and the coarse aggregates contribute to the macrocracking of the material, and the consequent reduction of mechanical properties. . La principal diferencia entre estas dos clases de cementantes es la presencia de calcio en la escoria lo que promueve la formación de una estructura compuesta fundamentalmente por geles de silicatos cál-cicos hidratados (C-(A)-S-H) (2), mientras que en los geopolímeros se forman geles del tipo aluminosilicato sódi-co hidratado (N-A-S-H) (4). KeywordsEl uso tanto de metacaolín como de escoria activada a...

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“…It is generally acknowledged that high temperature can increase mortar's porosity due to the generation of micro-cracks in the structure Gao et al 2002;Vydra et al 2001). The effect of temperature on strength properties of concrete has been extensively investigated (Bastami et al 2011;Chan et al 2000;Cül-fik and Özturan 2002;Ergün et al 2013;Fall and Samb 2009;Gardner et al 2005;Lin et al 2015), and it was concluded that the reduction in strength of a concrete is disastrous if heated up to 800°C . As reported in many publications (Caré 2008;Castellote et al 2004;Farage et al 2003;Lim and Mondal 2014;Rostásy et al 1980;Zhang et al 2013), the change of micro-structure and pore structures of mortar subjected to high temperatures was studied, revealing that the port-landite in mortar was decomposed abruptly and transformed into lime when it was heated up to 620°C before cooling (Castellote et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Special Issue: Aging Management of Nuclear Power Plant

Maruyama¹

2016

ACT

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PrefaceEven after the accident of the Fukushima Daiichi Nuclear Power Plant, the Japanese government has positioned nuclear power as an important base load power source in terms of energy policies and has focused on safety operation of the nuclear power generation. This is because it is an indispensable power source for the use of renewable energy in Japan with limited resources. On the other hand, the first generation commercial reactors in the world generally have a designed life of 30 to 40 years, but most of them have been in existence for more than 20 years. Japan is no exception, and several NPPs aged already more than 40 years.Analysis and research show that many commercial reactors leave enough capacity to operate beyond the designed service period. Replacement of the concrete members used in the reactor buildings is expensive making it difficult in many cases. Therefore, in order to continue nuclear power generation over the long term, it is necessary to maintain the performance of the concrete member during the designed service period. From this point of view, it is indispensable to conduct research on maintenance management, performance evaluation, and prediction of deterioration of concrete structures.Research on concrete in the field of civil engineering and building science has been conducted for a long time, while reevaluation of concrete performance, physical properties and various problems in terms of nuclear field needs, i.e. Plant Life Management and Ageing Management, and addressing issues peculiar to the nuclear power field will be an important contribution from the field of concrete research to the field of nuclear power engineering. As discussed at OECD / NEA, alkali silica reactions and radiation influence are important issues for the maintenance of nuclear power plants, and many research on them has been reported.Also in the past, research investment on concrete in the field of nuclear power has been carried out many times in Japan as well as in other developed countries. However, the international publication of the research results has been limited. In this ACT special issue, especially on advanced research in recent years, I widely urged stakeholders to make efforts to allow research trends in Japan to be forecast from other countries.Based on these backgrounds, we applied for papers focusing on Plant Life Management at nuclear power plant facilities and related technologies in the research related to concrete. I think that it became a State of the Art report, which highlights the current problems. I also anticipate it could lead to a trust from the society concerning future nuclear power generation technology and a development of the concrete research field. AbstractA review of the current state of knowledge on the effects of radiation on concrete in nuclear power production applications is presented. Emphasis is placed on the effects of radiation damage, as reflected by changes in engineering properties of concrete, in the evaluation of the long-term operation and for plant life or...

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Compressive strength and pore structure of high-performance concrete after exposure to high temperature up to 800°C

Cited by 285 publications

References 12 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

Desempeño a temperaturas altas de morteros y hormigones basados en mezclas de escoria/metacaolín activadas alcalinamente

Special Issue: Aging Management of Nuclear Power Plant

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