From Limestone To Cement

{question} my cement supplier is adding limestone to their cement.Is there anything to worry about? will i have to reduce the fly ash content i normally use? {answer} recently, astm c150 was harmonized to meet the aashto m85 to allow up to 5% limestone in the cement.The history of limestone in cement is a little checkered, and as a result, there is some controversy in this decision, .