Effect of temperature on porosity of concrete for nuclear-safety structures

Vydra, V.; Vodák, F.; Kapičková, O.; Hošková, Šárka

doi:10.1016/s0008-8846(01)00516-6

Cited by 64 publications

(36 citation statements)

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“…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). The transport properties of mortar subjected to temperature loading have been investigated (Caré 2008;Chen et al 2010;Chen et al 2010;Pulkrabek and Ibele 1987;Vydra et al 2001). The correlation between heating-induced crack porosity (and crack aspect ratio) and permeability has been investigated (Chen et al 2010).…”

Section: Introductionmentioning

confidence: 94%

“…During its long service life, mortar damage is developed both under the change of internal parameters (e.g. the chemical decompositions as a result of hydration processes (Mainguy et al 2000;Vydra et al 2001), and also under the change of external conditions (e.g. temperature (Lim and Mondal 2014;Vodák et al 2004), moisture (Saemann et al 2000), leading to the significant degradation of material properties.…”

Section: Introductionmentioning

confidence: 99%

“…Those processes can seriously affect durability of the material (Chen et al 2010) so as to reduce the safety of radioactive wastes storage. 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 .…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Special Issue: Aging Management of Nuclear Power Plant

Maruyama¹

2016

ACT

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“…m [7]. The specific surface of calcium oxide is large, therefore it becomes saturated with moisture from the environment and rehydrates.…”

Section: Introductionmentioning

confidence: 99%

The Mechanism of Disintegration of Cement Concrete at High Temperatures

Jocius¹,

Skripkiūnas²

2016

Construction Science

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-Concrete is a composite material composed of a binder, aggregates, water and additives. Mixing of cement with water results in a number of chemical reactions known as cement hydration. Heating of concrete results in dehydration processes of cement minerals and new hydration products, which disintegrate the microstructure of concrete. This article reviews results of research conducted with Portland and alumina cement with conventional and refractory concrete aggregates. In civic buildings such common fillers as gravel, granite, dolomite or expanded clay are usually used. It is important to point out the differences between fillers because they constitute the majority of the concrete volume.

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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 .…”

Section: Introductionmentioning

confidence: 99%