Basic Study on the Viscosity Equation of Cement Paste in Consideration of Flocculation State

We examined a working hypothesis of sticky thermoelectric (TE) materials, which is inversely designed to mass-produce flexible TE sheets with lamination or roll-to-roll processes without electric conductive adhesives. Herein, we prepared p-type and n-type sticky TE materials via mixing antimony and bismuth powders with low-volatilizable organic solvents to achieve a low thermal conductivity. Since the sticky TE materials are additionally injected into punched polymer sheets to contact with the upper and bottom electrodes in the fabrication process, the sticky TE modules of ca. 2.4 mm in thickness maintained temperature differences of ca. 10°C and 40°C on a hot plate of 40 °C and 120°C under a natural-air cooling condition with a fin. In the single-cell resistance analysis, we found that 75∼150-µm bismuth powder shows lower resistance than the smaller-sized one due to the fewer number of particle-particle interfaces in the electric pass between the upper and bottom electrodes. After adjusting the printed wiring pattern for the upper and bottom electrodes, we achieved 42 mV on a hot plate (120°C) with the 6 x 6 module having 212 Ω in the total resistance. In addition to the possibility of mass production at a reasonable cost, the sticky TE materials provide a low thermal conductivity for flexible TE modules to capture low-temperature waste heat under natural-air cooling conditions with fins for the purpose of energy harvesting.

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Sticky thermoelectric materials for flexible thermoelectric modules to capture low–temperature waste heat

Satoh

Otsuka

Sakurai

et al. 2020

MRS Advances

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Study on the Rheological Constants Estimation Method of Cement Paste by Flow Test

Higashifunamichi

Yamada

2021

Transactions of AIJ

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In this study, we performed various patterns paste flow analysis using FEM. After that, we performed correlation analysis on a relationship between flow characteristics and rheological constants obtained from FEM analysis. Correlation analysis revealed that there is a strong relationship between yield stress and flow value, and between plastic viscosity and paste density and flow arrival time. we investigated these relationships by actual test results (flow test and rheological test) using cement paste, and we proposed a rheological constants estimation equations. In addition, the effectiveness of estimation equations were confirmed by reproducing the actual flow test results using MPS.

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Study on the Rheological Constants Estimation Method of Cement Paste and Mortar by Flow Test

Higashifunamichi

Yamada

Hirano

2023

Transactions of AIJ

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In this study, we assumed that the cement paste and mortar are continuums and proposed a rheological constants estimation equation that can be applied to both cement paste and mortar. After that, the effectiveness of the proposed equations was verified using MPS analysis, and the effectiveness was confirmed in cement paste and low-fluidity mortar. However, for high-fluidity mortar, the actual measurement results could not be reproduced well by MPS analysis. In the case of high-fluidity mortar, the actual measurement results could be reproduced well in the MPS analysis considering thixotropy .

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Basic Study on the Viscosity Equation of Cement Paste in Consideration of Flocculation State

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Cited by 3 publications

References 3 publications

Sticky thermoelectric materials for flexible thermoelectric modules to capture low–temperature waste heat

Sticky thermoelectric materials for flexible thermoelectric modules to capture low–temperature waste heat

Study on the Rheological Constants Estimation Method of Cement Paste by Flow Test

Study on the Rheological Constants Estimation Method of Cement Paste and Mortar by Flow Test

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