Constructing a model for predicting optimum gypsum content of Portland cement

الملخص EN

Mathematical models are driven to predict the Optimum Gypsum Content (O.

G.

C.) of Portland cement at ages of 3, 7, 28, and 60 days, which imparts the cement maximum compressive strength.

To obtain such models the present study is divided into two parts : 1.

Development of statistical models for prediction of compressive strength of Portland cement.

2.

Formulation of the optimization problem, and formulation of the final form of the proposed models for predicting O.

G.

C.

of cement.

It was found that the mathematical derivation of the statistical models does not yield good results when the statistical model is a function of time.

But it yields good results when a special model is used for each age.

It was found that the fineness of cement, C3S, C2S, C3A, C4AF contents, unsoundness, initial setting time, and final setting time are the major factors in O.

G.

C.

and compressive strength prediction models.