Setting behavior of blended cement with limestone: influence of particle size and content

Knop, Yaniv; Peled, Alva

doi:10.1617/s11527-014-0509-y

Cited by 34 publications

(15 citation statements)

References 21 publications

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“…Therefore, according to Figure 1 , partial replacement of the original cement with fine limestone powder increased the hydration rate at the initial stage, although this decreased the active component in the blended cement (original cement). A similar effect on the hydration reaction, mainly at the initial stages, was reported in the literature [ 6 , 9 , 10 , 11 , 18 ].…”

Section: Resultssupporting

confidence: 81%

“…However, it was also shown that the combination of additives in a blended cement increases its packing density [ 17 ]. 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 ].…”

Section: Introductionsupporting

confidence: 59%

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

Knop

Peled

2018

Materials

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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.

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Section: Resultssupporting

confidence: 81%

Section: Introductionsupporting

confidence: 59%

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

Knop

Peled

2018

Materials

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“…Figure 4 shows that the O-RMA was covered with more CaCO 3 particles than B-RMA. Fine CaCO 3 promotes a hydration reaction and enhances the ITZ (interfacial transition zone) [43]; thus, the compressive strength of O-RMA/C is higher than that of B-RMA/C. The compressive strength of the B-RMA/C and O-RMA/C increased more than that of the U-RMA/C from 3 to 7 d, and the increase was similar with the mass death of bacteria in the later period.…”

Section: Resultsmentioning

confidence: 99%

Properties of Concrete Prepared with Recycled Aggregates Treated by Bio-Deposition Adding Oxygen Release Compound

Zhu

et al. 2019

Materials

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Recycled aggregates have high water absorption and crushing index. In order to improve the properties of recycled aggregates in concrete production, various treatments were used to modify the aggregates. In recent years, bio-deposition as a new treatment method of recycled aggregates was environmentally friendly. An improved method of bio-deposition was implemented to modify the properties of recycled mortar aggregates (RMA). O-bio-deposition is based on aerobic bacteria induced CaCO3 precipitation by respiration by varying the distance between the RMA and the bottom of the container and by adding an oxygen release compound to the culture solution that contains bacteria to promote the induction of CaCO3. First, the physical properties, including water absorption, crushing value, and apparent density, of the coarse RMA under different treatment methods were determined, and an o-bio-deposition treatment method was obtained. The fine RMA was treated and compared with the untreated RMA. Concretes were then prepared from the treated coarse RMA, and compressive strength and slump were determined. In addition, the effect of the o-bio-deposition treatment on the RMA surface and the micro-cracks of concretes were observed by scanning electron microscopy (SEM). It was found that the water absorption and crushing index of the coarse RMA treated by o-bio-deposition were reduced by 40.38 and 19.76% compared with untreated RMA, respectively. Regarding the concrete, the slump and the compressive strength (28 d) of concrete were increased by 115% and 25.3%, respectively compared with the untreated concrete.

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“…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

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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.

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Setting behavior of blended cement with limestone: influence of particle size and content

Cited by 34 publications

References 21 publications

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

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

Properties of Concrete Prepared with Recycled Aggregates Treated by Bio-Deposition Adding Oxygen Release Compound

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

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