The Indiana Department of Transportation (INDOT) has set a limit of 10% limestone content by mass in Type IL cement, according to Recurring Special Provision RSP-M-069. Some industry groups have questioned the technical basis for this restriction and its impact on material use.
The American Concrete Association (ACA) is working with INDOT to discuss these concerns. The ACA notes that neighboring states have different standards. Investigations are ongoing into recent bridge deck defects. Both parties are seeking a solution that addresses performance and material standards…