Shear-Thickening Behavior of Cement Pastes under Combined Effects of Mineral Admixture and Time

Yang, Hu; Lu, Cairong; Mei, Guoxing

doi:10.1061/(asce)mt.1943-5533.0002123

Cited by 10 publications

(5 citation statements)

References 18 publications

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“…Studies also have shown that cementitious material is a kind of time-dependent material. The workability and mechanical properties of cementitious materials, including rheological properties change along with resting time [34,35,36]. Aiad et al [37] found that the addition of chemical admixtures will make a great influence on the rheological properties of cement paste for a relatively long time (120 min).…”

Section: Introductionmentioning

confidence: 99%

Influence of Nano-SiO2, Nano-CaCO3 and Nano-Al2O3 on Rheological Properties of Cement–Fly Ash Paste

Peng

Long

2019

Materials

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Rheological curves of cement–fly ash (C–FA) paste incorporating nanomaterials including nano-SiO2 (NS), nano-CaCO3 (NC) and nano-Al2O3 (NA) at different resting times (hydration time of 5 min, 60 min, and 120 min) were tested with a rheometer. The rheological behaviors were described by the Herschel–Bulkley (H–B) model, and the influences of these nanomaterials on rheological properties of C–FA paste were compared. Results show that the types, content of nanomaterials and resting time have great influences on the rheological properties of C–FA paste. Incorporating NS and NA increases yield stress and plastic viscosity, and decreases the rheological index of C–FA paste. When the content of NS and NA were 2 wt%, the rheological index of C–FA paste was less than 1, indicating rheological behavior changes from shear thickening to shear thinning. Meanwhile, with rising resting time, yield stress and plastic viscosity increased significantly, but the rheological index decreased evidently, showing paste takes on shear thinning due to the rise of resting time. However, incorporating 3 wt% NC and the rising of resting time did not change the rheological properties of C–FA paste. These differences are mainly that the specific surface area (SSA) of NS (150 m2/g) and NA (120 m2/g) are much larger than that of NC (40 m2/g). The huge SSA of NS and NA consume lots of free water and these tiny particles accelerate the hydration process during resting time.

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Section: Introductionmentioning

confidence: 99%

Influence of Nano-SiO2, Nano-CaCO3 and Nano-Al2O3 on Rheological Properties of Cement–Fly Ash Paste

Peng

Long

2019

Materials

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“…The rheological properties of cement mixes can be separated into two categories: rheological parameters and rheological characteristics. Rheological parameters are important indexes to quantify the rheology of cementitious materials, which mainly include plastic viscosity and yield stress calculated by Bingham model [17][18][19]. Rheological characteristics relate to the phenomenon that the shear stress-shear rate relation of cement paste changes due to external shear force disturbance.…”

Section: Introductionmentioning

confidence: 99%

Effect of hydroxypropyl methyl cellulose on rheological properties of cement-limestone paste

2023

Archives of Civil Engineering

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The effects of hydroxypropyl methylcellulose (HPMC) on the rheology and viscoelasticity of cement-limestone paste were evaluated, as was the mechanism of HPMC from the viewpoint of zeta potential and adsorption amount. The results revealed that the greater the content of HPMC or the viscosity of its aqueous solution, the lower the fluidity of the composite paste and therefore the higher the rheological parameters. The relation between torque and rotational velocity of cement-limestone paste is linear; nevertheless, the shear thickening degree of paste increased following the addition of HPMC, demonstrating typical viscoelastic properties. The addition of HPMC prolonged the induction duration and delayed the emergence of the exothermic peak of hydration, decreased zeta potential and conductivity, and increased the propensity of suspension particles to agglomerate. The adsorption amount of polycarboxylate superplasticizer (PCE) decreased with increasing aqueous solution viscosity and HPMC concentration due to the winding effect of HPMC's high molecular chain structure and the competing adsorption of HPMC and PCE.

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“…Rheological properties are the intrinsic properties of concrete workability, and rheology of cement paste largely dictates rheology of concrete, especially at early ages [16,17]. For the Bingham model, the two most important basic parameters are plastic viscosity and yield stress [18,19]. Besides the properties of fluid, cement paste will show certain elastic properties when subjected to different amplitude or frequency of external shear force, which is described as the term "viscoelasticity" [20,21].…”

Section: Introductionmentioning

confidence: 99%

Rheo-viscoelastic behavior and viscosity prediction of calcium sulphoaluminate modified Portland cement pastes

2021

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Shear-Thickening Behavior of Cement Pastes under Combined Effects of Mineral Admixture and Time

Cited by 10 publications

References 18 publications

Influence of Nano-SiO2, Nano-CaCO3 and Nano-Al2O3 on Rheological Properties of Cement–Fly Ash Paste

Influence of Nano-SiO2, Nano-CaCO3 and Nano-Al2O3 on Rheological Properties of Cement–Fly Ash Paste

Effect of hydroxypropyl methyl cellulose on rheological properties of cement-limestone paste

Rheo-viscoelastic behavior and viscosity prediction of calcium sulphoaluminate modified Portland cement pastes

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