The presence of free lime and periclase in converter slag prevents it from directly being utilized as a source of concrete aggregate due to the deleterious expansion caused by reaction of free lime and periclase. In general. a six-month aging period is suggested in order to avoid any potential problems. but it is a tedious process that requires a long period of time. https://www.spidertattooz.com/Estes-C6-5-ENGINE-BULK-PACK/