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Title |
Prediction of the Rheological Properties of Cement Mortar Applying Multiscale Techniques
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Authors |
최은석(Eun-Seok Choi) ; 이준우(Jun-Woo Lee) ; 강수태(Su-Tae Kang) |
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DOI |
https://doi.org/10.11112/jksmi.2024.28.2.69 |
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Keywords |
유변특성; 항복응력; 소성점도; Chateau-Ovarlez-Trung 방정식; Krieger-Dougherty 방정식 Rheology; Yield stress; Plastic viscosity; Chateau-Ovarlez-Trung equation; Krieger-Dougherty equation |
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Abstract |
The rheological properties of fresh concrete significantly influence its manufacturing and performance. However, the diversification of newly developed mixtures and manufacturing techniques has made it challenging to accurately predict these properties using traditional empirical methods. This study introduces a multiscale rheological property prediction model designed to quantitatively anticipate the rheological characteristics from nano-scale interparticle interactions, such as those among cement particles, to micro-scale behaviors, such as those involving fine aggregates. The Yield Stress Model (YODEL), the Chateau-Ovarlez-Trung equation, and the Krieger-Dougherty equation were utilized to predict the yield stress for cement paste and mortar, as well as the plastic viscosity. Initially, predictions were made for the paste scale, using the water-cement ratio (W/C) of the cement paste. These predictions then served as a basis for further forecasting of the rheological properties at the mortar scale, incorporating the same W/C and adding the cement-sand volume ratio (C/S). Lastly, the practicality of the predictive model was assessed by comparing the forecasted outcomes to experimental results obtained from rotational rheometer.
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