Pozzolanic properties of reject fly ash in blended cement pastes

Poon, Chi Sun; Qiao, Xiuchen; Lin, Zong Shou

doi:10.1016/s0008-8846(03)00213-8

Cited by 75 publications

(26 citation statements)

References 20 publications

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“…2. It is expected that the content of arcanite in FA2 will provide an ambient environment for breaking the glass phase of fly ash particles (Poon et al 2003) as well as playing a catalytic role during the early stage of hydration (Rodrigues et al, 1999). The chemical compositions of FA1 and FA2 are shown in Table 1.…”

Section: Fly Ashesmentioning

confidence: 99%

Hydration Kinetics of a Low Carbon Cementitious Material Produced by Physico-Chemical Activation of High Calcium Fly Ash

Sadique

Al-Nageim

2012

ACT

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The hydration kinetics of a ternary system containing high lime fly ash activated with alkali sulphate rich fly ash has been studied. The effect of low intensive mechanical activation of fly ashes influencing the particle packing and water demand was undertaken. A ternary blend of fly ashes and silica fume was found to show improved bond strength between the binder paste and aggregate rather than the binder paste matrix with progressive hydration after 90 days. Analogous physico-chemical properties of the developed ternary blend with the control cement were revealed. Quick dissolution of K + , Na + and SO 4 2-into the liquid phase as well as consumption of Ca 2+ by silica fume in a high-pH environment were the predominant factors for producing a dense non-expansive hydration product by the ternary blend.

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Section: Fly Ashesmentioning

confidence: 99%

Hydration Kinetics of a Low Carbon Cementitious Material Produced by Physico-Chemical Activation of High Calcium Fly Ash

Sadique

Al-Nageim

2012

ACT

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“…Blended cement pastes (with 10% or 30% of oil shale ash) possessed stronger mechanical properties after being accelerated by 2.25%, 4.5% or 6.25% Na 2 SO 4 [6]. Adding 4% Na 2 SO 4 efficiently accelerated the pozzolanic activity of low grade ash (reject fly ash) when cement was replaced by 10%, 25% and 40% ash [7]. Moreover, when cement pastes contained a high volume of fly ash (%80%), Na 2 SO 4 effectively reduced the setting time and increased the compressive strength [8], and improved both of the early and later strengths at 23-65°C [9].…”

Section: Introductionmentioning

confidence: 99%

Recycling of switchgrass combustion ash in cement: Characteristics and pozzolanic activity with chemical accelerators

Wang

Shao

Matovic

et al. 2014

Construction and Building Materials

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“…The pozzolanic properties of r-FA in cement pastes have already been reported earlier, with encouraging results [33]. Poon and Ho suggested that it is technically feasible to utilize r-FA as part of the powder content in the production of SCC [34].…”

Section: Introductionmentioning

confidence: 71%

A Study on the Manufacturing of Energetically-Modified Reject Fly Ash and the Characteristics of Mortar

Jeong¹,

Chu²,

et al. 2016

J. Korean Ceram. Soc

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This paper presents an experimental study for the purpose of reducing the cost of producing ultrahigh performance fibrereinforced concrete (UHPFRC). Reject fly ash (r-FA) and recycled glass powder (GP) were examined as replacement materials for the silica sand and cement used to prepare UHPFRC, respectively. In addition, curing UHPFRC specimens at 25• C and 90• C was investigated to determine differences in mechanical properties. The results showed that using r-FA and GP reduces the flowability of fresh UHPFRC. The use of GP increased the mechanical properties of the UHPFRC. Moreover, the test results indicate a significant improvement in the mechanical properties of plain concrete by the inclusion of r-FA as partial replacement of fine aggregate (sand) and can be effectively used in UHPFRC. Furthermore, specimens cured at 25• C give lower compressive strength, flexural strength, and fracture energy than specimens cured at 90• C.

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Pozzolanic properties of reject fly ash in blended cement pastes

Cited by 75 publications

References 20 publications

Hydration Kinetics of a Low Carbon Cementitious Material Produced by Physico-Chemical Activation of High Calcium Fly Ash

Hydration Kinetics of a Low Carbon Cementitious Material Produced by Physico-Chemical Activation of High Calcium Fly Ash

Recycling of switchgrass combustion ash in cement: Characteristics and pozzolanic activity with chemical accelerators

A Study on the Manufacturing of Energetically-Modified Reject Fly Ash and the Characteristics of Mortar

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