scholarly journals Influence of Humidity on Yield Stress Determination by Slump Test of Slip-Prone Clayey Soils and Their Relation with the Chemical Properties

2012 ◽  
Vol 02 (04) ◽  
pp. 102-105
Author(s):  
Arturo F. Méndez-Sánchez ◽  
Ana M. Paniagua-Mercado ◽  
Karen E. Nieto-Zepeda ◽  
Leonor Pérez-Trejo ◽  
Elvia Diaz Valdés ◽  
...  
Keyword(s):  
Yield Stress ◽  
Chemical Properties ◽  
Clayey Soils ◽  
Stress Determination ◽  
Slump Test

Critical Indicator of Slip-Prone Clayey Soils Due Rainfall in Teziutlán-Puebla-México Zone: Yield Stress Determination by Slump Tests

2009 ◽  
Vol 1242 ◽  
Author(s):  
Arturo. F. Méndez-Sánchez ◽  
Karen E. Nieto Zepeda ◽  
Leonor Pérez-Trejo ◽  
Ana M. Paniagua-Mercado
Keyword(s):  
Water Content ◽  
Critical Point ◽  
Yield Stress ◽  
Clayey Soil ◽  
Clayey Soils ◽  
Stress Determination ◽  
Stress Evaluation ◽  
Maximum Precipitation ◽  
Reported Data ◽  
Rain Data

ABSTRACTThe yield stress evaluation as a function of water content for slip-prone clayey soils due to rainfall is studied in this work, particularly, the clayey soil from the region Teziutlán-Puebla-México. Yield stress was calculated as a function of water content using the slump test in cylindrical geometry. Results show a critical point of water content where yield stress decreases dramatically, and those values were related to the historical daily rain data. It was found a maximum precipitation millimeters that triggers the landslide, but still is low compared with the historical reported data.

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.

Comparative yield stress determination for pure and interstratified smectite clays

2004 ◽  
Vol 44 (3) ◽  
pp. 262-269 ◽  
Author(s):  
Saoussen Laribi ◽  
Jean-Marie Fleureau ◽  
Jean-Louis Grossiord ◽  
Nejia Kbir-Ariguib
Keyword(s):  
Yield Stress ◽  
Stress Determination ◽  
Smectite Clays

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.

Sources of error in yield stress determination of doped crystals

1985 ◽  
Vol 20 (5) ◽  
pp. K50-K51
Author(s):  
M. Hartmanová ◽  
G. A. Andreev
Keyword(s):  
Yield Stress ◽  
Stress Determination ◽  
Sources Of Error

scholarly journals On the evaluation of yield stress of soils for debris flow analysis

2019 ◽  
Vol 92 ◽  
pp. 05002
Author(s):  
Carlos Besso ◽  
Tácio Mauro Pereira de Campos
Keyword(s):  
Debris Flow ◽  
Yield Stress ◽  
Mass Movement ◽  
Flow Analysis ◽  
Rheological Parameters ◽  
Test Results ◽  
Slump Test ◽  
Acceleration And Deceleration ◽  
Cheap Alternative ◽  
Set Up

Debris flow materials behave as a fluid, hence its analysis requires rheological parameters such as yield stress and viscosity. Yield stress is associated to the start and the end of the mass movement downhill in the sense that it denotes the yield transition from the creep to the flow regime, i.e., passage from solid to fluid state. This paper presents an experimental study of the yield stress of a colluvium from Rio de Janeiro, through its determination in a modified set-up of the slump test and in a rotational parallel plate rheometer. Tests were performed in five different water contents above its liquidity limit, providing a fairly good relationship between yield stress and water content. While slump test provides yield stress related to the beginning of the movement (acceleration), rheometer results are related to flow's outset and stoppage. As a result, the percentual differences between yield stresses associated with acceleration and deceleration were less than 5% in all testes, which is related to the low hysteresis effect in the flow curves obtained in the rotational rheometer. Comparing the two methodologies, it is proposed a correction from rheometer to slump test results. Results obtained are compared with data presented in other studies involving soil's yield stress, showing a good acceptance of the slump test results as a cheap alternative to rheometers.

103 Application of Nanoindentation to Yield Stress Determination at Micro Area

2007 ◽  
Vol 2007.15 (0) ◽  
pp. 17-18
Author(s):  
Atsushi SEKIKAWA ◽  
Futoshi NISHIMURA ◽  
Ikuo IHARA
Keyword(s):  
Yield Stress ◽  
Stress Determination

On the yield stress of geotechnical materials from the slump test

1991 ◽  
Vol 28 (3) ◽  
pp. 457-462 ◽  
Author(s):  
B. Rajani ◽  
N. Morgenstern
Keyword(s):  
Yield Stress ◽  
Undrained Shear Strength ◽  
Bingham Fluid ◽  
Published Data ◽  
Important Class ◽  
Slump Test ◽  
Volcanic Lava ◽  
Undrained Shear ◽  
Good Agreement

There exists an important class of materials, e.g., debris, volcanic lava, sludges, and remoulded sensitive clays, that are known to behave like a Bingham fluid. One of the important properties of a Bingham fluid is the so-called yield stress, and it is usually determined using a coaxial viscometer apparatus. It would be impractical and cumbersome to use this apparatus for many of the materials referred to earlier, and we propose here to examine the use of the slump test. The slump test is used in the concrete industry to evaluate workability and consistency. A statical model is developed to explain the deformation mechanism, and it permits the determination of yield stress. The validity of the statical model is verified using published data on mortar and our own data on Devon silt. The yield stress obtained with the slump test is also compared with the undrained shear strength obtained using the fall cone test. Good agreement is found between the two values. Key words: Bingham fluid, yield stress, slump test, Devon silt.

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