Physical characterization of UK pulverized-fuel ashes for use in concrete

Dhir, Ravindra K.; Jones, M. R.; Munday, John G. L.; Hubbards, Frederick H

doi:10.1680/macr.1985.37.131.75

Cited by 12 publications

(9 citation statements)

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“…These and differences in irregular and porous particles between materials, are likely to influence the concrete results. Research from the 1980s (Dhir et al, 1985) gave general agreement between water requirement (in mortar) and concrete for equal slump.…”

Section: Concrete Propertiesmentioning

confidence: 86%

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Influence of modern coal-fired power technologies on fly ash properties and its use in concrete

McCarthy

Yakub

Csetényi

2019

Advances in Cement Research

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The Paper investigates the properties and use of fly ash produced from technologies developed to reduce environmental impact/improve efficiency of the coal-fired power generation process. These include, NOx reduction, co-combustion, supercritical steam technology and oxy-fuel combustion. The nine samples examined were characterized physically, chemically and in terms of their reactivity. Tests were also carried out for consistence and compressive strength of concrete. Comparisons were made with (i) a selection of reference fly ashes, (ii) the requirements of EN 450-1 and (iii) fly ash studies from the 1980s and 1990s. The results indicate that for some processes, fly ash tended to be coarser and of higher loss-on-ignition (co-combustion and incombustion NOx reduction), while for others lower carbon contents were found (supercritical steam), or there was little obvious effect. Fly ash chemistry was slightly affected in some cases, but mainly as expected for the coal being used. There was general agreement between water requirement and activity index with fly ash fineness. Similar effects were noted with concrete in terms of superplasticizing admixture dose for a target slump and compressive strength. The behaviour of the materials was similar to that from the earlier studies and suggests suitability for use in concrete construction.

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Section: Concrete Propertiesmentioning

confidence: 86%

“…To assist the data interpretation, scanning electron microscopy (SEM) studies were carried out. Comparisons were also made with research from the 1980s and 1990s, considering fly ashes produced during these periods (Dhir et al, 1985;Dhir et al, 1996), where appropriate.…”

Section: Programme Of Workmentioning

confidence: 99%

Influence of modern coal-fired power technologies on fly ash properties and its use in concrete

McCarthy

Yakub

Csetényi

2019

Advances in Cement Research

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“…As far as the effect of PFA variability on the performance of PFA concrete is concerned, the most important aspect of physical property is the fineness of the PFA, and the most important aspect of chemical property is the carbon content[1, 2,3,4, 5,6].…”

Section: Significance Of the Variability Of Pfa Propertiesmentioning

confidence: 99%

Strength development, deformation properties and mix design of pulverized fuel ash concrete

Balendran

Pang

1995

Structural Survey

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Discusses the properties of pulverized fuel ash (PFA) concrete both in its fresh and hardened states, with emphasis on aspects which are relevant to warmer localities such as Hong Kong. Sufficient research evidence, including surveys of existing structures, have been reviewed to conclude that PFA, when used correctly and properly, has the potential to enhance the performance of good concrete. Analyses the contribution of PFA in the enhanced performance of concrete. Cautions that much of the enhanced performance depends on the microstructure of the concrete, which in turn depends significantly on a proper mix design, with or without PFA. Proposes that water reduction is a desirable property of PFA. However, considers it possible to accommodate PFA characteristics in the mix design and by the use of plasticizer to produce good quality PFA concrete. Briefly discusses the characteristics of Hong Kong locally produced PFA.

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“…The required concrete workability and strength can be obtained with most as he^,'^-'^ within the national fineness range of around 5-40%. 20 In contrast, the specifications on fineness of OPC given in BS 12" is set as a minimum of 225 m2/kg, which makes it a permissive standard, given that the annual weighted mean and range values26 for fineness were 340 m2/kg and 305-370 m2/kg respectively in 1960, and 337 m2/kg and 287-390 m2/kg in 1980. 45.…”

Section: Dr R K Dhir Mr M R Jones and Dr F H Hubbard Dundee Umentioning

confidence: 99%

Discussion. A Study of Twnety-Five Year Old Pulverized Fuel Ash Concrete Used in F Oundation Structures.

Cabrera¹,

Woolley²,

Corish³

et al. 1986

Proceedings of the Institution of Civil Engineers

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Physical characterization of UK pulverized-fuel ashes for use in concrete

Cited by 12 publications

References 0 publications

Influence of modern coal-fired power technologies on fly ash properties and its use in concrete

Influence of modern coal-fired power technologies on fly ash properties and its use in concrete

Strength development, deformation properties and mix design of pulverized fuel ash concrete

Discussion. A Study of Twnety-Five Year Old Pulverized Fuel Ash Concrete Used in F Oundation Structures.

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