Time-resolved yield stress measurement of evolving materials using a creeping sphere

Kashani, Alireza; Provis, John L.; Deventer, Ben B. G. van; Qiao, Greg G.; Deventer, J.S.J. van

doi:10.1007/s00397-015-0839-x

Cited by 6 publications

(3 citation statements)

References 39 publications

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“…Alkali-activated materials (AAMs) have also been proven as useful model systems for the testing and validation of mini-slump [51] and creeping sphere [52] rheological measurement methods.…”

Section: Rheologymentioning

confidence: 99%

Recent progress in low-carbon binders

Shi

Provis

2019

Cement and Concrete Research

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493

131

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The development of low-carbon binders has been recognized as a means of reducing the carbon footprint of the Portland cement industry, in response to growing global concerns over CO2 emissions from the construction sector. This paper reviews recent progress in the three most attractive low-carbon binders: alkali-activated, carbonate, and belite-ye'elimite-based binders. Alkali-activated binders/materials were reviewed at the past two ICCC congresses, so this paper focuses on some key developments of alkali-activated binders/materials since the last keynote paper was published in 2015. Recent progress on carbonate and belite-ye'elimite-based binders are also reviewed and discussed, as they are attracting more and more attention as essential alternative low-carbon cementitious materials. These classes of binders have a clear role to play in providing a sustainable future for global construction, as part of the available toolkit of cements.

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“…Alkali-activated materials (AAMs) have also been proven as useful model systems for the testing and validation of mini-slump [51] and creeping sphere [52] rheological measurement methods.…”

Section: Rheologymentioning

confidence: 99%

Recent progress in low-carbon binders

Shi

Provis

2019

Cement and Concrete Research

Self Cite

493

131

View full text Add to dashboard Cite

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“…The ability to measure the effect of time can also be useful to investigate the complex coupling between viscoplastic deformation, aging, and rejuvenation (Agarwal and Joshi 2019;Coussot 2018;Joshi and Petekidis 2018). Moreover, the methodology used appears competitive compared to some others (Kashani et al 2015) for its simplicity.…”

Section: Conclusive Remarksmentioning

confidence: 99%

An alternative approach for measuring yield stress and its application in Carbopol microgel

et al. 2021

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An innovative experimental apparatus for the direct measurement of yield stress was conceived and realized. It is based on a torsion pendulum equipped with a magnetic dipole and a rotating cylinder immersed in the material to be investigated. The pendulum equilibrium state depends on the mechanical torque applied due to an external magnetic induction field, elastic reaction of the suspension wire, and shear yield stress. Experimental results are reported showing that the behavior of the pendulum rotation angle, in different equilibrium conditions, provides evidence of the yield stress presence and enables its evaluation by equilibrium equations. The dependence on time of the equilibrium approach was also studied, contributing to shed light on the relaxation effect in the transition from a fluid-like to solid-like behavior, as well as on the eventual thixotropic effects in non-Newtonian fluids. The validity of the proposed technique and related experimental apparatus was tested in aqueous Carbopol solutions, with different weight percentages. The linear procedure, combined with the effectiveness and reliability of the proposed experimental method, candidates it to be used for the study of peculiar behaviors of other yield stress complex fluid such as blood, crude waxy oils, ice slurries, and coating layer used in the food industry and also for fault sliding in geodynamics.

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“…Setting was indicated by a sharp rise in yield stress, at a time when the Vicat penetration measurements still showed nothing. Kashani et al [32] used the creeping sphere method to measure the time-resolved yield stress of alkali-activated slag pastes up to 140 min. In this study, blast furnace slag was sequentially substituted with two Class F fly ashes with different particle sizes in the binary blast furnace slag-metakaolin geopolymer to further broaden the chemical domain for solidifying and stabilizing HSW with a focus on the time dependence of fresh and cured properties.…”

Section: Introductionmentioning

confidence: 99%

Rheology, Setting, Heat of Reaction, and Compressive Strength of a Geopolymer Radioactive Waste Form

et al. 2023

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This work contributes to our understanding of the properties of geopolymers as waste forms made of three pozzolans, to be used, e.g., to immobilize liquid low-activity radioactive waste. A binary blast furnace slag and metakaolin geopolymer composition was tailored to achieve flexible rheological properties and workability for in-can mixing or mixing/pumping applications by adding fly ash, a third pozzolan. We investigated quantitatively the early stages of geopolymerization (before and after setting) of alkali-activated slag–metakaolin–fly ash pozzolans. The effect of fly ash glass particle size on material properties was studied as well. Measurements include heat of reaction, compressive strength, yield stress, plastic viscosity, rheological setting, as well as initial and final setting following the Vicat method. A rheological time of initial setting is suggested for geopolymers, in analogy to Portland cement. The results of Vicat needle and rheological measurements are compared and quantitatively related to heat and set time data. Maximum heat flow and compressive strength are linearly correlated.

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Time-resolved yield stress measurement of evolving materials using a creeping sphere

Cited by 6 publications

References 39 publications

Recent progress in low-carbon binders

Recent progress in low-carbon binders

An alternative approach for measuring yield stress and its application in Carbopol microgel

Rheology, Setting, Heat of Reaction, and Compressive Strength of a Geopolymer Radioactive Waste Form

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