Prediction of mortar-cube strength from cement characteristics

A model was developed to predict portland cement mortar-cube strengths at any age from one to 28 days with consistently high accuracy, based on a linear regression of selected physical and chemical characteristics routinely obtained in the cement laboratory. Random differences between model predictions and measured mortar-cube strengths appeared at all ages, but declined in magnitude with increasing age. Data “clustering” at given test ages resulted in low predictive capability of the model until it was “corrected” through a time-sequence dynamic correction procedure. The final model is: f′t = a(C3S)+b(C2S)+c(C3A+1.125{SO3})+d(C4AF)+e(SO3) + f(Blaine)+g(lnWC′) + Co.