The fluidity of fly ash-cement paste with superplasticizer

Nagataki, Shigeyoshi; Sakai, Etsuo; Takeuchi, Tohru

doi:10.1016/0008-8846(84)90025-5

Cited by 24 publications

(4 citation statements)

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“…The superplasticizer was not adsorbed on fly ash particles. Nagataki et al 39 found that the adsorption of superplasticizers is dependent on the nature of fly ash.…”

Section: Review Of Previous Workmentioning

confidence: 99%

A review of cement–superplasticizer interactions and their models

Mollah¹,

Adams²,

Schennach

et al. 2000

Advances in Cement Research

204

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This paper presents a focused review of cement±superplasticizer interactions. It has been concluded from the survey of the literature that cement±superplasticizer interactions are generally preceded by the adsorption of superplasticizers on the hydrating cement particles. However, the mechanisms of such adsorptive interactions have not been adequately addressed experimentally or discussed in the literature. The reason for this appears to be the lack of a conceptual model that can delineate the results to date and project needed experiments. A chargecontrolled-reaction mechanism model involving Ca 2 ions from initial hydration is proposed to explain the adsorption characteristics of superplasticizers and other organic additives and their effects. The calcium ions released by hydration form a bilayer immediately upon contact of water with the cement, which is followed by adsorption of superplasticizer anions on the Ca 2 ion side of the bilayer. The interfacial structures and their influence on electrical characteristics, hydration reactions and phase growth in the hydrating cement are discussed in terms of the proposed model.

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“…The superplasticizer was not adsorbed on fly ash particles. Nagataki et al 39 found that the adsorption of superplasticizers is dependent on the nature of fly ash.…”

Section: Review Of Previous Workmentioning

confidence: 99%

A review of cement–superplasticizer interactions and their models

Mollah¹,

Adams²,

Schennach

et al. 2000

Advances in Cement Research

204

View full text Add to dashboard Cite

show abstract

“…The spherical shape of FA allows it to function as ball bearings in cementitious materials, which can improve the workability of fresh concrete (Mindess et al 2003). In addition, loss of ignition (LOI) is a measurement of the carbon content in FA, and it affects concrete workability and properties since FA with a high LOI value has higher water requirement; and FA with a low LOI value can reduce the heat of hydration (Nagataki et al 1984;Dhir et al 1988). The American Society for Testing and Materials (2015) requires the LOI of FA to be less than 4%, and it classifies FA into two types based on their chemical composition (i.e., Type F and Type C).…”

Section: Supplementary Cementitious Materials and Inert Fillersmentioning

confidence: 99%

Tensile behaviour of ultra-high-performance steel fiber reinforced concrete

et al. 2021

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Recent developments in the area of Ultra-High-Performance Steel Fiber Reinforced Concrete (UHP-SFRC) enables reduction in steel reinforcement, and has led to enhanced ductility and toughness of structural components owing to its resilient tensile behaviour. This paper presents the results of an experimental study conducted to investigate the tensile behaviour of UHP-SFRC. Four commercial mixes and two in-house mixes were evaluated using the procedures prescribed in the 2018 edition of Annex 8.1 of CSA-S6. Tensile strength of UHP-SFRC was quantified and correlated through the direct tension test, splitting test, inverse analysis of four-point bending test using either code expressions or nonlinear finite element analysis, and a calibrated empirical expression that links this property to the cylinder compressive strength. In addition, the effect of important parameters on flexural strength including casting methodology, volumetric ratio of steel fibers, and aspect ratio (shear span to depth ratio) of bending prisms have been assessed.

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“…Wang [ 48 ] used image analysis coupled with backscattered electron (BSE) to evaluate the special surface area, which is able to provide a satisfying estimation. Image analysis is also used to study the pore structure of cement paste [ 49 ], reaction degree [ 50 ], glass phases [ 51 ] and elongation [ 52 ] of fly ash. Scanning electron microscopy (SEM) is always used to observe the morphology of fly ash particles.…”

Section: Introductionmentioning

confidence: 99%

Influence of Particle Morphology of Ground Fly Ash on the Fluidity and Strength of Cement Paste

Wang

Zhao

et al. 2021

Materials

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The grinding process has become widely used to improve the fineness and performance of fly ash. However, most studies focus on the particle size distribution of ground fly ash, while the particle morphology is also an important factor to affect the performance of cement paste. This article aims at three different kinds of ground fly ash from the ball mill and vertical mill, and the particle morphology is observed by scanning electron microscopy (SEM) to calculate the spherical destruction (the ratio of spherical particles broken into irregular particles in the grinding process of fly ash), which provides a quantification of the morphology change in the grinding process. The fluidity of cement paste and the strength of cement mortar are tested to study the relation of spherical destruction and fluidity and strength. The results show that the spherical destruction of ground fly ash in a ball mill is more than 80% and that in a vertical mill with a separation system is only 11.9%. Spherical destruction shows a significant relation with the fluidity. To different addition of ground fly ash, the fluidity of cement paste decreases with the increase of spherical destruction. To the strength of cement paste, particle size distribution and spherical destruction are both the key factors. Therefore, spherical destruction is an important measurement index to evaluate the grinding effect of the fly ash mill.

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The fluidity of fly ash-cement paste with superplasticizer

Cited by 24 publications

References 0 publications

A review of cement–superplasticizer interactions and their models

A review of cement–superplasticizer interactions and their models

Tensile behaviour of ultra-high-performance steel fiber reinforced concrete

Influence of Particle Morphology of Ground Fly Ash on the Fluidity and Strength of Cement Paste

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