PREDICTION OF VISUAL SEGREGATION JUDGEMENT BY LOGISTIC REGRESSION ANALYSIS FOR HIGH AND MEDIUM FLUIDITY CONCRETE

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  • NONAKA Kiyoshi
    TAIHEIYO CEMENT CORPORATION, Central Research Laboratory（2-4-2, Osaku, Sakura-shi, Chiba 285-8655, Japan）
  • MEGURO Takafumi
    TAIHEIYO CEMENT CORPORATION, Central Research Laboratory（2-4-2, Osaku, Sakura-shi, Chiba 285-8655, Japan）
  • ISHIDA Masao
    TAIHEIYO CEMENT CORPORATION, Central Research Laboratory（2-4-2, Osaku, Sakura-shi, Chiba 285-8655, Japan）
  • YAMADA Yoshitomo
    UNIVERSITY OF THE RYUKYUS, Faculty of Engineering（1, Senbaru, Nishihara-cho, Nakagami-gun, Okinawa 903-0213, Japan）

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Other Title
  • ロジスティック回帰分析を用いた高流動・中流動コンクリートの目視材料分離予測手法の検討

Abstract

<p>Segregation for high and medium fluidity concrete is visually judged conventionally, which has difficulty for labor saving and IT-driven optimization due to variation between observers and small amount of information. In this study, binomial logistic regression analysis is utilized to relate rheological constants and standard segregation judge. Plastic viscosity, yield value, and judging location （in mixing vessel or on slump flow board） are chosen as explanatory variables. Analysis result evaluated that the lower the plastic viscosity and the lower the yield value, the higher the risk of segregation, and observation in mixing vessel tend to judge as segregated than observation on slump flow board. Statistically, all explanatory variables are evaluated as significant factors （p-value＜0.01）. When standard threshold, which judge as segregated when the segregation risk is higher than 50 percent is used, 90.7％ of experimental data are predicted correctly. In addition, safer threshold could be chosen to lower false negative rate （risk to overlook segregation）. The result of this study determined almost no medium fluidity concretes slump flow of which is less than 550mm are judged as segregated regardless of plastic viscosity and judging location. On the other hand, when slump flow is more than 550mm, not only plastic viscosity but also judging location has an important effect on segregation judge.</p>

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