Characteristics of the ultrafine component of fly ash

Jones, M. R.; McCarthy, A.; Booth, A.P.P.G.

doi:10.1016/j.fuel.2006.01.028

Cited by 66 publications

(30 citation statements)

References 11 publications

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“…Many researches elucidated that increasing the fineness of fly ash either by grinding or classifying could accelerate the hydration of binder and improve the compressive strength of mortar or concrete [9][10][11][12][13]. Both the grinding and classifying process have little influence on the chemical compositions of fly ash, but finer fly ash obtained by classifying increases the amorphous SiO 2 content and tends to decrease the amount of SO 3 [14], and it also results in a low utilization rate of fly ash due to the residue of coarse fly ash. For ground fly ash, the grinding http://dx.doi.org/10.1016/j.conbuildmat.2015.05.117 0950-0618/Ó 2015 Elsevier Ltd. All rights reserved.…”

Section: Introductionmentioning

confidence: 99%

The differences among the roles of ground fly ash in the paste, mortar and concrete

Han

Wang

Feng

2015

Construction and Building Materials

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Section: Introductionmentioning

confidence: 99%

The differences among the roles of ground fly ash in the paste, mortar and concrete

Han

Wang

Feng

2015

Construction and Building Materials

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“…Long et al (2002) observed that the addition of ultrafine fly ash or slag could improve the fluidity of cement paste at low water content. Later, Jones et al (2006) found that the addition of ultrafine fly ash would also increase the flow of mortar. On the use of rice husk ash, Cordeiro et al (2009) found that the addition of ultrafine rice husk ash would reduce the yield stress and viscosity only when the HRWRA dosage is increased to allow for the increase in solid surface area whereas Givi et al (2010) showed that partial replacement of cement by a coarser rice husk ash gives better workability than by a finer rice husk ash.…”

Section: Introductionmentioning

confidence: 99%

Roles of Packing Density and Water Film Thickness in Rheology and Strength of Cement Paste

Kwan

Chen

2012

ACT

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Lowering the water/cementitious materials (W/CM) ratio is the key for the production of high-strength concrete and high-performance concrete, but there is a limit to lowering the W/CM ratio because the water added must be enough to fill the voids between solid particles and form water films coating the solid particles. Hence, an increase in packing density of the cementitious materials would allow a lower W/CM ratio to be adopted. This research aims to evaluate the effects of adding superfine cement (SFC) and condensed silica fume (CSF) on the packing density of cementitious materials, and study the roles of packing density and water film thickness in the rheological properties and compressive strength of cement paste. The results showed that the addition of SFC and/or CSF can significantly increase the packing density and water film thickness, and thereby greatly improve the rheological and strength performances of cement paste.

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“…The higher unburned carbon content of fly ash 1 is likely to have contributed to its observed higher water demand (Rajamma et al, 2009) (relative to fly ash 1) are also notable from Figure 4. The presence of increased pozzolanically active amorphous phases in fly ash 2 was thought to be dominant in this reduction in crystal phases (Jones et al, 2006, Sadique et al, 2012. and CKD 2 and with a combination of cement, CKD 1 and GGBS.…”

Section: Effect Of Ckd Contentmentioning

confidence: 99%

The influence of physico-chemical properties of fly ash and CKD on strength generation of high-volume fly ash concrete

Sadique

Coakley

2016

Advances in Cement Research

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This paper presents a laboratory study on the use of Cement Kiln Dust (CKD) as an activator of fly ash when used in high volumes within concrete. Two separate batches of fly ash and CKD were tested to assess the effect of material variability on binder properties and compressive strength gain. Ternary blends of fly ash (55% -65%), CEM 1 (30%) and CKD (5% -15%) and quaternary blends that included moderate amounts (15% -18.5%) of Ground Granulated Blast-Furnace Slag (GGBS) were prepared.Physico-chemical properties of individual binder materials were compared and concrete compressive strength was measured at 2 days, 7 days and 28 days. Ternary blends of 60% fly ash, 30% cement and 10% CKD resulted in moderate early age and 28 day strength and addition of GGBS enhanced strength significantly due to increased ettringite formation. Particle fineness, water demand and LOI content of fly ash and CaO and SO3 content of CKD were found to be the main physico-chemical factors that influence compressive strength gain.

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Characteristics of the ultrafine component of fly ash

Cited by 66 publications

References 11 publications

The differences among the roles of ground fly ash in the paste, mortar and concrete

The differences among the roles of ground fly ash in the paste, mortar and concrete

Roles of Packing Density and Water Film Thickness in Rheology and Strength of Cement Paste

The influence of physico-chemical properties of fly ash and CKD on strength generation of high-volume fly ash concrete

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