Contribution of PFA to concrete workability and strength development

Dhir, Ravindra K.; Hubbard, F. H.; Munday, John G. L.; Jones, M. R.; Duerden, S.L.

doi:10.1016/0008-8846(88)90012-9

Cited by 40 publications

(11 citation statements)

References 5 publications

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“…The chemical composition of ground¯y ashes is not shown because the chemical composition of the¯y ash may remain unchanged after grinding. 16 Only the loss of ignition parameter (which increased) was modi®ed by the grinding process. Finally, the chemical parameters for sieved¯y ashes were seen to be similar to those of unprocessed¯y ash.…”

Section: Results and Discussion Characterization Of Processed Fly Ashesmentioning

confidence: 99%

“…This situation is probably due to the fact that complete loss of the outer glass had occurred, exposing the mullite/quartz crystal endoskeleton of all the¯oaters. 16 Figure 4(c) shows that for ground¯y ash mortar only crystalline material was left, with a total loss of glass from both the outer and inner zones. particles totally covered by hydration products can be observed.…”

Section: Studies Of Cement/fly Ash Matrix By Semmentioning

confidence: 96%

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Long term mechanical strength behaviour in fly ash/Portland cement mortars prepared using processed ashes

Payá¹,

Borrachero²,

Monzó³

et al. 2002

J of Chemical Tech & Biotech

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It is well-known that some treatments of¯y ash may improve its reactivity and consequently the strength of mortars containing these processed ashes. In this paper the effects of treatments on¯y ashes are compared: sieving, grinding, and magnetic extractions from aqueous suspensions. The in¯uence of these processed ashes on compressive strength development of mortars containing processed¯y ashes for long curing periods was studied. The gain or loss of compressive strength with respect to mortar that contains original ash has been calculated; most mortars present positive values, although for the longest curing times (more than 90 weeks), these values tend towards unity except for ground¯y ash mortars. The grinding treatment has proved to be an effective treatment for improving the compressive strength of mortars containing¯y ashes over long curing times. The high activity index values versus curing time for mortars containing 60% replacement demonstrate that for high¯y ash volume mortars the processing of original ash has very favourable effect on the strength. Moreover, the morphology of the cement/¯y ash hydrated matrix of old mortars was analysed by SEM and also thermogravimetric methods have been applied for evaluation of lime content and hydrates. For old mortars containing a high volume of ground¯y ashes (60% replacement) residual lime due to hydration of Portland cement has not been detected, suggesting that the optimum replacement in order to produce the maximum quantity of pozzolanic reaction products would be lower than 60%.

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Section: Results and Discussion Characterization Of Processed Fly Ashesmentioning

confidence: 99%

Section: Studies Of Cement/fly Ash Matrix By Semmentioning

confidence: 96%

Long term mechanical strength behaviour in fly ash/Portland cement mortars prepared using processed ashes

Payá¹,

Borrachero²,

Monzó³

et al. 2002

J of Chemical Tech & Biotech

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“…The replacement of cement with fly ash will increase the volume of cementitious materials in mixture. The increase of paste volume in concrete results in a reduction in aggregate particle interference and it will also increase the workability of concrete [9,16]. The mix proportion of of concrete was calculated based on the Modified Maximum Density Theory [17].…”

Section: Methodology/experimental Workmentioning

confidence: 99%

Using Cementitious Materials Such as Fly Ash to Replace a Part of Cement in Producing High Strength Concrete in Hot Weather

Turuallo

Mallisa

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The use of waste materials in concrete gave many advantages to prove the properties of concrete such as its workability, strength and durability; as well to support sustaianable development programs. Fly ash was a waste material produced from coal combustion. This research was conducted to find out the effect of fly ash as a part replacement of cement to produce high strength concrete. The fly ash, which was used in this research, was taken from PLTU Mpanau Palu, Central Sulawesi. The water-binder ratio used in this research was 0.3 selected from trial mixes done before. The results of this research showed that the strength of fly ash concretes were higher than concrete with PCC only. The replacement of cement with fly ash concrete could be up to 20% to produce high strength concrete .

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“…The HVFA concrete is one specific type of fly ash concrete with higher fly ash content that is above 50% with lower water cementitious material ratio (0.4) and lower cement contents. Fly ash used to improve the workability of fresh concrete to reduce the heat hydration, to improve economy, to decrease permeability, to increase durability and strength of concrete [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Performance of High Volume Fly Ash in Concrete Structures

Thangaraj¹

2012

IOSRJMCE

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Contribution of PFA to concrete workability and strength development

Cited by 40 publications

References 5 publications

Long term mechanical strength behaviour in fly ash/Portland cement mortars prepared using processed ashes

Long term mechanical strength behaviour in fly ash/Portland cement mortars prepared using processed ashes

Using Cementitious Materials Such as Fly Ash to Replace a Part of Cement in Producing High Strength Concrete in Hot Weather

Performance of High Volume Fly Ash in Concrete Structures

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