scholarly journals Effects of PCE on the Dispersion of Cement Particles and Initial Hydration

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3195
Author(s):  
Weiwei Zhu ◽  
Qingge Feng ◽  
Qi Luo ◽  
Xiukui Bai ◽  
Xianhao Lin ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Film Thickness ◽  
Water Film ◽  
Experimental Results ◽  
Hydration Products ◽  
Cement Pastes ◽  
Degree Of Hydration ◽  
Water Film Thickness ◽  
Adsorption Amount

The effects of polycarboxylate superplasticizers (PCEs) on the dispersing properties and initial hydration of cement particles with various water-to-cement (w/c) ratios was investigated, including the water film thickness (WFT), rheology, fluidity, adsorption of PCEs, zeta potential, degree of hydration, hydration products. The experimental results demonstrate that the initial rheological and fluidity parameters were more sensitive to the PCE dosage at a lower w/c because the WFT and the zeta potential on cement particles change more significantly. Moreover, the higher adsorption amounts of the PCEs at a lower w/c lead to a stronger inhibition of the initial hydration, whilst, at the same PCE dosage, the cement pastes have a more rapid fluidity loss and quicker hydration reactions at a higher w/c due to a lower adsorption amount of the PCE on cement particles.

Effects of packing density and water film thickness on fresh and hardened properties of ternary cement pastes

2020 ◽  
Vol 32 (10) ◽  
pp. 444-455 ◽  
Author(s):  
Guillermina Marchetti ◽  
Edgardo Fabián Irassar ◽  
Viviana Fátima Rahhal
Keyword(s):  
Film Thickness ◽  
Packing Density ◽  
Water Film ◽  
Cement Pastes ◽  
Water Film Thickness ◽  
Hardened Properties

Influence of Ground Slag on the Rheology of Mortar

2013 ◽  
Vol 438-439 ◽  
pp. 67-71
Author(s):  
Qian Qian Zhang ◽  
Jian Zhong Liu ◽  
Jia Ping Liu
Keyword(s):  
Film Thickness ◽  
Specific Surface ◽  
Yield Stress ◽  
Surface Area ◽  
Specific Surface Area ◽  
Water Film ◽  
Plastic Viscosity ◽  
Rheological Parameters ◽  
Water Film Thickness ◽  
Binder Ratio

The effects of ground slag with different specific surface area on the rheology of mortar at water-binder ratio of 0.25, 0.28 and 0.30 were investigated, and the combined effects of packing density and solid surface area on the rheology of mortar were evaluated in terms of the water film thickness. The results show that with the increasing of specific surface area of slag (220 m2/kg-784 m2/kg), plastic viscosity and yield stress decrease. The correlations of yield stress and plastic viscosity to the water film thickness are basically linear with high correlation R2 values. The action of the ground slag on the rheology of mortar can be characterized by water film thickness, and with the increasing of water film thickness the rheological parameters decrease.

Measuring Water Film Thickness in a Wet Gas Compressor Diffuser: Design, Calibration, and Testing of Electromagnetic Probes

2017 ◽  
Author(s):  
Craig Nolen ◽  
Melissa Poerner
Keyword(s):  
Film Thickness ◽  
Water Level ◽  
Water Film ◽  
Probe Design ◽  
Two Phase ◽  
Water Film Thickness ◽  
Wet Gas ◽  
Flow Phenomena ◽  
In Series ◽  
Electromagnetic Probes

The distribution of water in the diffuser of a wet gas compressor is not well understood. Measurements of water film thickness across the diffuser surface would improve the understanding of two-phase flow phenomena in wet gas compressors. Electromagnetic probes were designed in order to measure water film thickness in the diffuser of a SwRI-designed wet gas compressor. The probes consisted of two electrode foils plated on a thin insulating substrate, allowing them to be bonded in place without drilling through the diffuser. An AC signal was passed between the electrodes, and the voltage across a resistor in series with the electrodes was recorded. As the water level covering the electrodes increased, the recorded voltage increased. A method of calibrating the probes was developed and used prior to installation in the diffuser. Testing showed the probes to be effective at detecting the presence of water in the diffuser and indicating the general water level. Improvements in probe design, calibration, and installation are needed to provide more precise water film thickness data.

Effects and threshold of water film thickness on multi-mineral cement paste

2020 ◽  
Vol 112 ◽  
pp. 103677 ◽  
Author(s):  
Hengrui Liu ◽  
Xiao Sun ◽  
Hui Du ◽  
Hao Lu ◽  
Yuanshan Ma ◽  
...  
Keyword(s):  
Film Thickness ◽  
Cement Paste ◽  
Water Film ◽  
Water Film Thickness
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