Estimation of the Bond grindability index from chemical analysis values and modulus of mixture of raw material of marls

In this study, the relationships between Bond grindability index (G_bg) and chemical constituents were investigated on marl samples from the AS cement factory (Burdur/Turkey). First, standard Bond grindability tests were carried out for marl samples. Then, chemical analysis values were performed for six different marl samples. Second, the modulus of mixture of raw materials (lime saturation factor, cementation index, saturation factor, cementation index, alumina modulus, lime and silica modulus, hydraulic modulus, silica modulus) was calculated. Finally, the relationships between the Bond grindability (G_bg) with chemical analysis values (calcium oxide, silicon dioxide and loss on ignition) and modulus of a mixture of raw materials were examined. The validity of the obtained relationship equations have been confirmed with correlation coefficients (r²) of as high as 0·954, outside silica modulus through a simple regression analysis of marl samples. From these relationships, the Bond grindability index of marl samples can be determined with good accuracy.