飛灰水泥砂漿抗壓強度和超音波速預測模式

Prediction Models of Compressive Strength and UPV of Cement Mortar with Fly Ash

本研究主要以再生水泥砂漿，利用體積法設計，將再生材料飛灰取代水泥（0%, 10%, 20%, 30%），進行抗壓強度及超音波速試驗，並應用雙曲線函數（hyperbolic function） 進行非線性多變數的迴歸分析，以建立飛灰水泥砂漿抗壓強度和超音波速預測模式。試驗結果與分析值的比較顯示，抗壓強度迴歸求得之判決係數R2 為0.981，平均絕對誤差百分比MAPE 值為8.84%；超音波速迴歸求得之R2 為0.987，MAPE 值為1.52%。因此本文研擬的預測分析模式在抗壓強度和超音波速等都有不錯之分析結果。至於本研究試驗結果趨勢及預測分析模式，是否適用其他的配比條件，仍有待進一步的研究與驗證。

This study used recycled cement mortar and adopted the volumetricmethod for experimental design, which replaced cement (0%, 10%, 20%,30%) with fly ash to test compressive strength and ultrasonic pulse velocity(UPV). The hyperbolic function was applied to perform the nonlinearmultivariateregression analysis of the compressive strength and UPVprediction models. The calculated results were in accordance with laboratorymeasureddata, which were mortar compressive strength and UPV ofvarious mix proportions. In addition, the coefficient of determination R2 andmean absolute percentage error (MAPE) were 0.981 and 8.84% for the compressive strength, 0.987 and 1.52% for the UPV, respectively. The proposedmodels were highly accurate in predicting the compressive strengthand UPV of fly ash cement mortar. However, with other ranges of mixtureparameters, the predicted models must be further studied.