Correlation between the adsorption behavior of colloidal polymer particles and the yield stress of fresh cement pastes

2022 ◽  
Vol 152 ◽  
pp. 106668
Author(s):  
Chaoyang Zhang ◽  
Xiangming Kong ◽  
Jianwei Yu ◽  
Daniel Jansen ◽  
Joachim Pakusch ◽  
...  
Keyword(s):  
Yield Stress ◽  
Adsorption Behavior ◽  
Polymer Particles ◽  
Cement Pastes

scholarly journals The influence of sulfate availability on rheology of fresh cement paste

2020 ◽  
Vol 30 (1) ◽  
pp. 54-63
Author(s):  
Willy Mbasha ◽  
Rainer Haldenwang ◽  
Irina Masalova
Keyword(s):  
Yield Stress ◽  
Calcium Sulfate ◽  
Chemical Properties ◽  
Plastic Viscosity ◽  
Cement Clinker ◽  
Flow Properties ◽  
Cement Pastes ◽  
Hardened Properties ◽  
Physical And Chemical ◽  
And Chemical Properties

AbstractNatural gypsum can degenerate into hemihydrate during cement clinker grinding which changes the physical and chemical properties of cement hydration, affecting therefore the fresh and hardened properties of cement based materials. Cement systems containing a constant total amount of calcium sulfate (4%) with relative proportions of hemihydrate and natural gypsum were considered. Rheological measurements were executed on an Anton Paar MCR51 rheometer to evaluate the flow properties of cement pastes. Results show that, the yield stress and the plastic viscosity of cement pastes were affected when the degeneration of natural gypsum exceeded 50%. Above this concentration, the yield stress remarkably increased and a variation in plastic viscosity of about 50% was observed. Using TG-DSC techniques, it was shown that, the amount of formed ettringite could not explain these rheological changes. However, centrifugational packing and SEM-SE measurements confirmed that, more than the amount of ettringite precipitated, ettringite morphology plays a major role in controlling the yield stress and plastic viscosity of fresh cement pastes.

Testing Procedures on Materials to Formulate the Ink for 3D Printing

2020 ◽  
Vol 2674 (2) ◽  
pp. 21-32 ◽  
Author(s):  
Malo Charrier ◽  
Claudiane Ouellet-Plamondon
Keyword(s):  
3D Printing ◽  
Yield Stress ◽  
Three Dimensional ◽  
Testing Procedure ◽  
Full Potential ◽  
Cement Pastes ◽  
Slump Test ◽  
Testing Procedures ◽  
Transportation Sector ◽  
Printing Ink

Three-dimensional (3D) printing has been used in various fields to tackle applications difficult for conventional manufacturing. To realize the full potential of this technology in the transportation sector, it is imperative to identify suitable tests and mixtures for printing “inks” made of mortar. In this study, several conventional and non-conventional tests on mortars and cement pastes were conducted. This work highlights the correlation between the results of slump test and the deformation test that indicates the comportment of the mixture under a stack of printed layers. Moreover, a strong connection between yield stress and mini-slump is observed, demonstrating a simplification of the testing procedure, and a link between the mortar and the cement paste is developed. In the printing ink design phase, this association enables the prediction of flowability. The yield stress and the final radius of the mini-slump tests were very well correlated for the admixture tested. The use of the mini-slump test simplifies the testing procedure and allows for quicker formulations of admixtures in the printing ink.

Effect of vane configuration on yield stress measurements of cement pastes

2016 ◽  
Vol 230 ◽  
pp. 31-42 ◽  
Author(s):  
Joseph J. Assaad ◽  
Jacques Harb ◽  
Yara Maalouf
Keyword(s):  
Yield Stress ◽  
Cement Pastes ◽  
Stress Measurements

Yield stress during setting of cement pastes from penetration tests

2009 ◽  
Vol 39 (5) ◽  
pp. 401-408 ◽  
Author(s):  
D. Lootens ◽  
P. Jousset ◽  
L. Martinie ◽  
N. Roussel ◽  
R.J. Flatt
Keyword(s):  
Yield Stress ◽  
Cement Pastes ◽  
Penetration Tests

Measurement of yield stress of cement pastes using the direct shear test

2014 ◽  
Vol 214 ◽  
pp. 18-27 ◽  
Author(s):  
Joseph J. Assaad ◽  
Jacques Harb ◽  
Yara Maalouf
Keyword(s):  
Yield Stress ◽  
Direct Shear Test ◽  
Shear Test ◽  
Direct Shear ◽  
Cement Pastes

scholarly journals Cumulative effect of hydrophobic PLMA and surface epoxide groups in composite polymer particles on adsorption behavior of congo red and direct red-75

2019 ◽  
Vol 12 (8) ◽  
pp. 4989-4999 ◽  
Author(s):  
Rukhsana Shabnam ◽  
Muhammad A.J. Miah ◽  
Mostafa K. Sharafat ◽  
Mohammad A. Alam ◽  
Hasan M.T. Islam ◽  
...  
Keyword(s):  
Congo Red ◽  
Cumulative Effect ◽  
Adsorption Behavior ◽  
Composite Polymer ◽  
Polymer Particles ◽  
Composite Polymer Particles

Rheological Properties of Fresh Cement Paste and its Relation to Adsorption Behavior of Superplasticizer

2009 ◽  
Vol 405-406 ◽  
pp. 96-102
Author(s):  
Dong Lin ◽  
Man Man Fang ◽  
Xiao Lin Xi ◽  
Heng Chang Wang ◽  
Su Hong Yin ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Adsorption Capacity ◽  
Cement Paste ◽  
Apparent Viscosity ◽  
Adsorption Behavior ◽  
Cement Pastes ◽  
Effect Mechanism ◽  
Naphthalene Sulfonic Acid ◽  
Uv Visible ◽  
S Curve

This paper studied rheological properties of fresh cement pastes and adsorption behavior of superplasticizers which are FDN-5R, a type of naphthalene sulfonic acid based condensate, 3350, a type of polycarboxylate superplasticizer, by R/S-SST rheometer and UV Visible Spectrometer. Results show that superplasticizers can reduce the flocculation structure of fresh cement paste obviously and reduce the yield stress and apparent viscosity. The turn of thixotropic property is: blank sample > FDN-5R > 3350, especially the sample with 3350’s curve of upward and downward almost match together and the thixotropic property drives to zero. Shearing stress, apparent viscosity and thixotropic property are decreased, adsorption capacity is higher by the superplasticizer adding. The bigger effectual adsorption, the better dispersive action of flocculation and rheological properties of fresh cement pastes. Therefore, we can understand the effect mechanism and properties of superplasticizer much better by combining the molecular structure, adsorption capacity, dispersive action and rheological properties.

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