The Development of Highly Durable Concrete Using Classified Fine Fly Ash in Hokuriku District

Hashimoto, Tohru; Torii, Kazuyuki

doi:10.3151/jact.11.312

Cited by 16 publications

(4 citation statements)

References 5 publications

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“…Incidentally, in this region, the ASR suppressing effect of locally produced fly ash has been confirmed and the ASR control measures by fly ash have been recommended in recent years (Sannoh et al 2008;Hashimoto et al 2013;Torii et al 2016).…”

Section: Mineralogical Properties and Alkali-silica Reactivity Of Volmentioning

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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Section: Mineralogical Properties and Alkali-silica Reactivity Of Volmentioning

confidence: 99%

Special Issue: Aging Management of Nuclear Power Plant

Maruyama¹

2016

ACT

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“…Worldwide, industrial waste from thermal combustion of coal is been used for soil and asphalt stability, concrete production and as raw material for cement and embankment works among others (Hashimoto and Torii, 2013). According to Malhotra (2002), annual global production of fly ash is closely 500 million tonnes, but only approximately 20% is being utilized by the concrete industry.…”

Section: Introductionmentioning

confidence: 99%

Performance of Fly Ash as Replacement for Non-Renewable Constituent in Asphaltic Concrete for Road Development

CHUKWUKA¹,

OLUGBENGA²,

Aderinlewo³

et al. 2021

JCEU

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The non-renewable constituent used in asphalt concrete consumed large amount of materials resulting an increase in the price of asphalt mixture and consequently the cost of road development. On the other hand, huge industrial waste being generated daily from human activities causes environmental degradations. Thus, the study evaluates the performance of fly ash (FA) in asphalt concrete development targeted for road application. The aggregate, bitumen, and fly ash were characterized before being used. The stone dust in asphalt mixture was replaced with FA in predetermined proportions of 2, 4, 6, and 8% to produce a cylindrical specimen of asphalt mixture concrete. Marshal stability test, flow test, X-ray diffraction (XRD), X-ray Fluorescence (XRF) and Scanning Electron Microscope (SEM) was conducted on the composite samples. From the results, stability values of 7.39, 7.70, 7.90 and 8.22 KN was obtained at 2, 4, 6 and 8% replacements, respectively. Hence, the optimum value of 8.22 KN obtained from 8% partial replacement with FA is adequate for heavy traffic while other partial replacement from 2- 6% with stability within the range of 7.39-7.90 KN is suitable for medium traffic in accordance with the criteria for the marshal mix design method provided by Asphalt institute (1997). Corresponding values of 3.7, 3.5, 3.3 and 3.0 mm was obtained for the flow. The flow, air void, void in mineral aggregates and void filled with bitumen results all satisfied Nigeria general specification for road and bridges (1997). Therefore, fly ash can be used as partial replacement in asphaltic concrete to enhance the performance of the mix with a reduced cost for pavement construction.

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“…As for BFS, 42% level of BFS replacement ratio is the replacement ratio being used for blast-furnace slag mix cements type B which is the popular BFS cement in Japan. In addition, Japan's researcher commonly used these replacement ratios in experimental studies [9][10][11]. Moreover, the andesite aggregate from Hokkaido, Japan was used as the reactive aggregate and the accelerated mortar bars experiment will be conducted according to the JIS A1146 mortar bar test method.…”

Section: Introductionmentioning

confidence: 99%

The Effectiveness of High Quality Supplementary Cementitious Materials for Mitigating ASR Expansion in Concrete with High Alkali Content

Prasetia

2015

Eng. Technol. Appl. Sci. Res.

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Alkali silica reaction (ASR) is influenced by external factors such as the surrounding environment of high alkalinity. Countries with cold climate have a high probability to be exposed to high concentrations of NaCl solution by the deicing salt. This condition will lead to serious ASR problems in concrete, if the aggregates contain reactive silica. The main research work in this paper is to investigate the effect of 15% replacement ratio of high quality fine fly ash (FA15%) and 42% replacement ratio of blast furnace slag (BFS42%) on the ASR mitigation in concrete with different alkali amount inside the pore solution. The experiments were conducted according to the accelerated mortar bars experiment following the JIS A1146 mortar bar test method. In addition, post-analysis such as observation of ASR gel formation by the Uranyl Acetate Fluorescence Method and observation of thin sections using a Polarizing Microscope were also conducted. The mortar bar tests show a very good mitigation effect of supplementary cementitious materials (SCMs). The results show that only small ASR expansions, which can be categorized as “innocuous”, occurred for specimens with 1.2% Na2Oeq using FA15% and BFS42%. However, larger alkali amount inside the system will require more SCMs amount.

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The Development of Highly Durable Concrete Using Classified Fine Fly Ash in Hokuriku District

Cited by 16 publications

References 5 publications

Special Issue: Aging Management of Nuclear Power Plant

Special Issue: Aging Management of Nuclear Power Plant

Performance of Fly Ash as Replacement for Non-Renewable Constituent in Asphaltic Concrete for Road Development

The Effectiveness of High Quality Supplementary Cementitious Materials for Mitigating ASR Expansion in Concrete with High Alkali Content

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