Cement additives

Your question addresses different areas of technology: (1) cement milling, and (2) concrete admixtures (an important topic for users of cement and those who need to appreciate their problems, and one for which a selection of books are available). Grinding aids historically achieve exactly what their name suggests, and the most appropriate cost-effective chemical formulations may be different when different materials are being ground. "Quality improvers" for cement have become economically interesting during the past decade or two. When using such mill additives it is important to recognise what reactions they are influencing: for example, if it's the early-age hyrdration of C3A, then the dosage most likely should be based upon the proportion of clinker in a composite cement grind, rather than the total solid througput.