Packing density modeling of blended cement with limestone having different particle sizes

Knop, Yaniv; Peled, Alva

doi:10.1016/j.conbuildmat.2015.09.063

Cited by 61 publications

(12 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Obviously, many investigations are being focused on how to improve the reactivity of these SCMs. The main choices are: (i) Mechanical activation (Knop and Peled, 2016;Liu et al, 2018) (controlling the particle size distribution); (ii) Thermal activation (Vizcaíno-Andrés et al, 2015;Scrivener et al, 2018b) (especially for calcined clays-LC3 technology-); (iii) Chemical activation (Ruiz-Santaquiteria et al, 2013;Allahverdia and Malekia Mahinroosta, 2018) ("alkaline activated cement"). It is quite probable that future will lead to us to a combination of those options above mentioned like the most effective choice.…”

Section: Introductionmentioning

confidence: 99%

Studies About the Hydration of Hybrid “Alkaline-Belite” Cement

2019

View full text Add to dashboard Cite

The mechanical performance of a hybrid cement containing 48% fly ash, 48% mineralized belite clinker, 1. 5% gypsum and 2.5% Na 2 SO 4 was analyzed and the hydration products were identified. The findings showed that the newly designed cement met European standard EN 197-1 compositional, mechanical and setting time requirements (cement type IVB). The hydration products forming in this blended "alkaline-belite" cement (as it was determined through XRD, 29 Si and 27 Al MAS NMR and electron microscopy) consisted in a mix of cementitious gels: C-(A)-S-H and N-(C)-AS -H, which interacted and over time evolved toward the latter with no detriment to the mechanical strength developed by the cement.

show abstract

Section: Introductionmentioning

confidence: 99%

Studies About the Hydration of Hybrid “Alkaline-Belite” Cement

2019

View full text Add to dashboard Cite

show abstract

“…An effect on the packing density was also shown by Knop et al [ 18 ]; blended cement with limestone additive and combined particle sizes attained a greater packing density than single-sized limestone-blended cement. In addition, this effect of the limestone size and content on the packing density was simulated by a mathematical model [ 19 ]. The same effect was also observed by Vuk et al [ 9 ], who showed that the addition of fine limestone powder (2% residue on a 90-mm sieve) decreases the water demand necessary for standard consistency and also decreases the initial and final settings, as measured by the Vicat method.…”

Section: Introductionmentioning

confidence: 99%

Sustainable Blended Cements—Influences of Packing Density on Cement Paste Chemical Efficiency

Knop

Peled

2018

Materials

Self Cite

View full text Add to dashboard Cite

This paper addresses the development of blended cements with reduced clinker amount by partial replacement of the clinker with more environmentally-friendly material (e.g., limestone powders). This development can lead to more sustainable cements with reduced greenhouse gas emission and energy consumption during their production. The reduced clicker content was based on improved particle packing density and surface area of the cement powder by using three different limestone particle diameters: smaller (7 µm, 3 µm) or larger (70 µm, 53 µm) than the clinker particles, or having a similar size (23 µm). The effects of the different limestone particle sizes on the chemical reactivity of the blended cement were studied by X-ray diffraction (XRD), thermogravimetry and differential thermogravimetry (TG/DTG), loss on ignition (LOI), isothermal calorimetry, and the water demand for reaching normal consistency. It was found that by blending the original cement with limestone, the hydration process and the reactivity of the limestone itself were increased by the increased surface area of the limestone particles. However, the carbonation reaction was decreased with the increased packing density of the blended cement with limestone, having various sizes.

show abstract

“…Dentre os vários fatores que afetam o empacotamentomorfologia, porosidade, densidade das partículas, efeito de parede, técnica de compactaçãoo estado de dispersão das partículas é o que influi diretamente na trabalhabilidade e demais propriedades do concreto no estado fresco [12][13][14]. Partículas finas tendem a ser submetidas a forças coesivas interparticulares (forças de Van der Waals) formando pequenos aglomerados de partículas [15].…”

Section: Conceito De Empacotamento De Partículasunclassified

Considerações sobre a eficiência de misturas de concreto de cimento Portland com base no conceito de empacotamento de partículas

2020

View full text Add to dashboard Cite

RESUMO O concreto é o material de construção mais utilizado e nos últimos anos, estudos têm sido desenvolvidos em busca de materiais com desempenho mecânico e durabilidade superior. Com a finalidade de abranger a realidade das obras civis no que se refere à produção in loco do concreto convencional e de alta resistência, diversos métodos de dosagem são propostos. Apesar de esses métodos permitirem obter a proporção ideal entre os materiais constituintes da mistura de concreto, é possível otimizar a composição aplicando-se o conceito de empacotamento de partículas. Diante disso, o presente estudo tem por objetivo avaliar a eficiência do empacotamento de partículas de misturas de concretos de cimento Portland amplamente utilizados na prática da construção civil, obtidas por métodos de dosagem tradicionais. Para isso, foram produzidos três traços deconcreto utilizando o método de dosagem tradicional IPT/EPUSP, sendo dois para concretos com classe de resistência convencional e um de alta resistência. Conhecendo a proporção e a distribuição granulométrica dos materiais constituintes desses concretos, o coeficiente de distribuição de cada mistura foi determinado considerando o modelo de empacotamento de Alfred. Posteriormente, mantendo-se o mesmo coeficiente de distribuição, as misturas de concretos foram otimizadas aplicando o conceito de empacotamento de partículas, sendo determinadas as propriedades físicas e mecânicas dos concretos. No processo de otimização, verificouse lacunas entre as distribuições granulométricas dos materiais constituintes normalmente considerados na produção dos concretos, caracterizando uma deficiência quanto ao empacotamento. Com relação as propriedades do concreto no estado endurecido, as misturas otimizadas apresentaram, em geral, propriedades físicas e mecânicas superiores aos concretos de referência.

show abstract

Packing density modeling of blended cement with limestone having different particle sizes

Cited by 61 publications

References 18 publications

Studies About the Hydration of Hybrid “Alkaline-Belite” Cement

Studies About the Hydration of Hybrid “Alkaline-Belite” Cement

Sustainable Blended Cements—Influences of Packing Density on Cement Paste Chemical Efficiency

Considerações sobre a eficiência de misturas de concreto de cimento Portland com base no conceito de empacotamento de partículas

Contact Info

Product

Resources

About