Coupled effect of time and temperature on variations of yield value of highly flowable mortar

Petit, Jean-Yves; Khayat, Kamal H.; Wirquin, Eric

doi:10.1016/j.cemconres.2005.11.001

Cited by 74 publications

(22 citation statements)

References 9 publications

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“…Breakdown of initial connections between cement particles due to hydration can also contribute to structural breakdown: the decrease in shear stress at constant shear rate [15,40], which is often confused with thixotropic behavior [41]. For workability loss, the rheological parameters will increase with elapsed time [42], as cement-based materials transform from a liquid into a solid material. Cement physical and chemical properties, as well as chemical admixtures can significantly alter the rheological properties, including thixotropy, structural breakdown and workability loss.…”

Section: Definitionsmentioning

confidence: 99%

Avoiding inaccurate interpretations of rheological measurements for cement-based materials

Wallevik

Feys

Wallevik

et al. 2015

Cement and Concrete Research

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228

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Section: Definitionsmentioning

confidence: 99%

Avoiding inaccurate interpretations of rheological measurements for cement-based materials

Wallevik

Feys

Wallevik

et al. 2015

Cement and Concrete Research

Self Cite

228

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“…This result implies that the rate of fly ash hydration is apparently constant during the prolonged mixing time, and an ongoing buildup in the network structure bonded by hydration products occurs. Petit et al [31] explored the effect of time on the rheological properties of highly flowable mortars and revealed that the yield stress increases in a linear fashion with time up to the end of the dormant period for the admixtures considered. Figure 3d demonstrates the influence of CaCl 2 concentration on the rheograms of ash-tailings slurry mixtures.…”

Section: Resultsmentioning

confidence: 99%

Rheology of Fly Ash Mixed Tailings Slurries and Applicability of Prediction Models

Lee

Kim

2017

Minerals

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Abstract:Coal fly ash has potential applications in the management of reactive mine tailings. The shear stress versus shear rate curves obtained during viscometer tests are presented to describe the rheological behaviors of tailings slurries mixed with fly ash. The investigation was conducted on specimens prepared with different fly ash additions as well as prepared at variable conditions of temperature, mixing time, and CaCl 2 solution. It was observed that the rheological properties of ash-tailings slurry mixtures are influenced by the hydration of fly ash as well as the particle packing and arrangement. Rheological properties of specimen mixtures were determined from the resulting flow curves using the existing rheological models. The performance of prediction models in calculating the rheological properties of the mixed specimens, as quantified by the root mean square error (RMSE), varied with the mixture constituents, temperature, and time. In general, the Papanastasion, Herschel-Bulkley, Sisko, and Robertson-Stiff models were found to be favorable for use with mixtures of fly ash and tailings slurries, compared to the Bingham, Modified Bingham, Casson, and De Kee models.

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“…The lower the charge density, the slower but the more polymers can adsorb. In case of high dosages, some molecules will not adsorb directly but time dependent [3,6]. Typically highly charged PCEs are used for quick performance over a short period of time, whereas lowly charged PCEs are used if flow retention is required.…”

Section: Introductionmentioning

confidence: 99%

Effects of Superplasticizer and Viscosity-Modifying Agent on Fresh Concrete Performance of SCC at Varied Ambient Temperatures

Schmidt

Brouwers

Kühne

et al. 2010

Design, Production and Placement of Self-Consolidating Concrete

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Abstract. Varying ambient temperatures in plants or on construction sites during casting of SCC can cause serious problems affecting the fresh concrete performances, such as rheological properties and setting time, with consequences for the hardened properties in the structure. By sensible choices of the components, the robustness of SCC mixtures against temperature variations can be improved. However, this aspect has not been the focus of intensive research yet. In this study the effects of varied ambient temperatures on the early performance of differently composed SCC mixtures are investigated, with emphasis on changes in rheology, early deformations, heat evolution and setting. Focus is placed on the study of the influence of the polycarboxylate ether molecule type as well as different viscositymodifying agents on the temperature robustness. Effects on the relevance for practical concrete applications are evaluated, which will provide a reliable framework of possible actions on the appropriate use of admixtures for SCC.

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Coupled effect of time and temperature on variations of yield value of highly flowable mortar

Cited by 74 publications

References 9 publications

Avoiding inaccurate interpretations of rheological measurements for cement-based materials

Avoiding inaccurate interpretations of rheological measurements for cement-based materials

Rheology of Fly Ash Mixed Tailings Slurries and Applicability of Prediction Models

Effects of Superplasticizer and Viscosity-Modifying Agent on Fresh Concrete Performance of SCC at Varied Ambient Temperatures

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