粉煤灰掺量对简化权重成熟度法预测准确性的影响

The Amount of Fly Ash Influence to Prediction Accuracy Using the Simplified Weighted Maturity Method

摘要: 本文结合东部过境高速公路连接线工程，应用简化权重成熟度预测粉煤灰混凝土早期抗压强度，研究表明，(预测值/实测值)均值1.00，变异系数6.5%，预测准确性高；在水胶比0.45和胶凝材料400 kg/m³固定的情况下，不同粉煤灰掺量的强度预测公式的斜率相同、截距不同，粉煤灰掺量每增加10%，截距减少5 MPa。

Abstract: In this paper, the early compressive strength of fly ash concrete is predicted in the Shenzhen east-ern transit expressway connecting line project, using the Simplified Weighted Maturity Method. The result of the study shows that: the mean value (predicted value/measured strength) is 1.00; the C.V is 6.5% and the prediction accuracy is high. Under the condition of W/B 0.45 and cementitious material 400 kg/m³, the slope of the strength prediction formula for different fly ash concrete is same and the intercept is different. When fly ash content increases 10%, the intercept reduces 5 MPa.