Evaluation of zeta potential of calcined clays and time-dependent flowability of blended cements with customized polycarboxylate-based superplasticizers

2021 ◽  
Vol 308 ◽  
pp. 125061
Author(s):  
Ricarda Sposito ◽  
Matthias Maier ◽  
Nancy Beuntner ◽  
Karl-Christian Thienel
Keyword(s):  
Zeta Potential ◽  
Time Dependent ◽  
Blended Cements

scholarly journals Effect of mixing water types on the time-dependent zeta potential of Portland cement paste

2013 ◽  
Vol 20 (3) ◽  
pp. 285-292 ◽  
Author(s):  
Bahri Ersoy ◽  
Sedef Dikmen ◽  
Tayfun Uygunoğlu ◽  
Mehmet Galip İçduygu ◽  
Taner Kavas ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Portland Cement ◽  
Cement Paste ◽  
Cement Industry ◽  
Time Dependent ◽  
Mineral Admixtures ◽  
Water Type ◽  
Water Types ◽  
Portland Cement Paste ◽  
Mixing Water

AbstractThe measurement of zeta potential (ZP) has important applications in a wide range of industries including ceramics, pharmaceuticals, medicine, mineral processing, electronics, cement industry and water treatment. It provides new information on cement hydration, gel structure formation and the effects of chemical and mineral admixtures. In this study, ZP and pH measurements of Portland cement suspension prepared at wt% 1 cement/water ratio in the presence of four different types of waters, i.e., pure water, tap water, and salted (NaCl and CaCl2) water, were carried out depending on the time. Also, vicat tests of Portland cement pastes prepared at a water-to-cement ratio of 0.34 were performed. After the vicat tests, X-ray diffraction analysis and scanning electron microscopy investigations were performed on the samples. The most important result obtained from this study is that setting time and time-dependent ZP values of Portland cement paste have different values depending on the used mixing water type. Among the water types, water with CaCl2 gives the lowest ZP as absolute value, so this leads to minimum initial and final setting times for the cement paste prepared with this type of water.

Investigating the time-dependent zeta potential of wood surfaces

2018 ◽  
Vol 518 ◽  
pp. 165-173 ◽  
Author(s):  
Livius F. Muff ◽  
Thomas Luxbacher ◽  
Ingo Burgert ◽  
Benjamin Michen
Keyword(s):  
Zeta Potential ◽  
Time Dependent ◽  
Wood Surfaces

scholarly journals Filler and Water Reducer Effects on Sedimentation, Bleeding and Zeta-Potential of Cement Paste

2018 ◽  
Vol 58 (1) ◽  
pp. 107-125 ◽  
Author(s):  
Ya Peng ◽  
Bård Pedersen ◽  
Serina Ng ◽  
Klaartje de Weerdt ◽  
Stefan Jacobsen
Keyword(s):  
Hydrostatic Pressure ◽  
Zeta Potential ◽  
Cement Paste ◽  
Time Dependent ◽  
Sedimentation Rates ◽  
Combined Effects ◽  
Zeta Potentials ◽  
The Stability ◽  
Pressure Changes ◽  
Improve Stability

Abstract Bleeding and sedimentation quantify the stability of fresh cement paste, whereas the addition of fillers and water reducers affect the stability. The effect of various types of fillers and water reducers was investigated by measuring bleeding, hydrostatic pressure and electroacoustic zeta-potential. Depending on their characteristics and use, fillers can improve stability by reducing sedimentation rate and bleeding. The combined effects of fillers and water reducers on the sedimentation rates, quantified as time-dependent hydrostatic pressure changes (dp/dt) in fresh matrix, correspond to their effects on zeta-potentials. The influence of the water reducers on sedimentation and bleeding exceed that of filler type.

Scanning Electron Microscopy and x-ray analysis of microparticles and early hydration effects

1995 ◽  
Vol 53 ◽  
pp. 692-693
Author(s):  
Yun Lu ◽  
David C. Joy
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Resolution ◽  
Morphological Development ◽  
Early Hydration ◽  
X Ray ◽  
Blended Cements ◽  
Powder Particles ◽  
Chemical Wastes ◽  
Scanning Electron

High resolution scanning electron microscopy (SEM) and energy dispersive x-ray analysis (EDXA) were performed to investigate microparticles in blended cements and their hydration products containing sodium-rich chemical wastes. The physical appearance of powder particles and the morphological development at different hydration stages were characterized by using high resolution SEM Hitachi S-900 and by SEM S-800 with a EDX spectrometer. Microparticles were dispersed on the sample holder and glued by 1% palomino solution. Hydrated bulk samples were dehydrated by acetone and mounted on the holder by silver paste. Both fracture surfaces and flat cutting sections of hydrating samples were prepared and examined. Some specimens were coated with an 3 nm thick Au-Pd or Cr layer to provide good conducting surfaces. For high resolution SEM S-900 observations the accelerating voltage of electrons was 1-2 KeV to protect the electron charging. Microchemical analyses were carried out by S800/EDS equipped with a LINK detector of take-off angle =40°.

Sign in / Sign up

Export Citation Format

Share Document