Estimation of fly ash reactivity for use in alkali-activated cements - A step towards sustainable building material and waste utilization

Shekhovtsova, Julia; Zhernovsky, I.; Kovtun, Maxim; Kozhukhova, N. I.; Zhernovskaya, I.; Kearsley, Elsabé P.

doi:10.1016/j.jclepro.2017.12.270

Cited by 68 publications

(26 citation statements)

References 50 publications

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“…Many authors (Rakesh et al, 2007;Temuujin et al, 2009;Kumar and Kumar, 2011;Kumar et al, 2015;Shekhovtsova et al, 2018) have broached the effect of fineness on ash reactivity, separating the material either by sieving (particles under 45 µm (Duvallet et al, 2015) or electrostatic precipitation (Kumar et al, 2015). Their findings have consistently shown that mechanical strength rises substantially with ash fractions of under 45 µm.…”

Section: Introductionmentioning

confidence: 99%

Mechanical-Chemical Activation of Coal Fly Ashes: An Effective Way for Recycling and Make Cementitious Materials

et al. 2019

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This paper is wholly committed to resource efficiency through the valorization of waste from other industries, and more specifically fly ash as a raw material to produce concrete-like geopolymers. In particular, this study aimed to determine the effect of the physical and chemical characteristics of recycled coal fly ash used to manufacture alkaline cement on reaction kinetics and product microstructure and performance. The ash was mixed with 8 M NaOH and cured for 20 h at 85 • C and RH > 90% to form a compact paste, after which mechanical strength was determined and the reaction rate was calculated using isothermal conduction calorimetry. The findings showed that vitreous content (SiO 2 /Al 2 O 3 ), reactive and (especially) fineness play a very important role in both the development of cement mechanical strength and the composition and structure of the reaction products formed.

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Section: Introductionmentioning

confidence: 99%

Mechanical-Chemical Activation of Coal Fly Ashes: An Effective Way for Recycling and Make Cementitious Materials

et al. 2019

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“…Beyond 5.500 cm 2 /g, the fineness has little effect on the mechanical strength [20]. In other studies, the strength has been found to increase when the Blaine fineness increases from 171 to 472 m 2 /kg, especially at lower values [29]. At fineness between 15.67 and 25.55 m 2 /g, a positive relationship was found between the surface area of metakaolin powders and the compressive strength of the geopolymers [30].…”

Section: Introductionmentioning

confidence: 81%

“…The mechanical performance of geopolymers is generally evaluated after curing at temperatures between 60 • C and 90 • C [22,33] or even at 100 • C [29,32]. Curing is also performed under high humidity as the concrete mixture is covered with plastic membranes or bags after preparation [22,23,25,28].…”

Section: Introductionmentioning

confidence: 99%

Laboratory Evaluation of Finely Milled Brick Debris as a Soil Stabilizer

2019

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Brick is one of the most common building materials, and it is also one of the largest components of waste generated from both construction and demolition. Reuse of this waste would reduce the environmental and social impacts of construction. One potential bulk use of such waste is as a cementing agent for soil stabilization. However, this is currently limited by the need to mill the residue to a particle size below 0.035 mm. In this study, the behavior of two soil types stabilized using alkali-activated brick dust was investigated. The unconfined compression strength at different curing temperatures and moistures and the use of different types and concentrations of alkaline activators were investigated. It was found that the addition of brick dust resulted in an increase in the soil strength between 1.7-2.3 times with respect to the non-stabilized material, suggesting that the resulting materials will find practical applications in construction.

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“…Сроки схватывания и равномерность изменения объема цементно-зольного теста определялись в соответствии с требованиями TCVN 6017:2015 (СРВ) [19].…”

Section: таблица 1 использование золошлаковых отходов в качестве сырьunclassified

“…Химический состав образцов зол-уноса представлен в таблице 2. Используя информацию о содержании оксидов в составе стеклофазы зол-уноса был произведен расчет значений степени полимеризации или степень SiO2-связности кремнекислородного тетраэдра стеклофазы по формуле (1), ранее предложенной А. Аппеном [18,19] : 3 5 2 2 3 2 2 2 2 3 5 2 3 MeO 15. Hopkins C.J., Cabrera J.G., The shape factor: a parameter to assess the effect of pulverized fuel ash on the flow properties of cement pates and concrete.…”

Section: таблица 1 физические характеристики зол-уносаunclassified

Mechanics of Crushing Medium in Ball Mills With Longitudinal-Transverse Motion of Grinding Bodies

Богданов¹,

Bogdanov

Фадин³

et al. 2018

Bulletin of Belgorod State Technological University Named After. V. G. Shukhov

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Estimation of fly ash reactivity for use in alkali-activated cements - A step towards sustainable building material and waste utilization

Cited by 68 publications

References 50 publications

Mechanical-Chemical Activation of Coal Fly Ashes: An Effective Way for Recycling and Make Cementitious Materials

Mechanical-Chemical Activation of Coal Fly Ashes: An Effective Way for Recycling and Make Cementitious Materials

Laboratory Evaluation of Finely Milled Brick Debris as a Soil Stabilizer

Mechanics of Crushing Medium in Ball Mills With Longitudinal-Transverse Motion of Grinding Bodies

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