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Indiana Department of Transportation Limits on Type IL Cement
INDOT’s Recurring Special Provision (RSP-M-069), which limits limestone content in Type IL cement to 10% by mass, lacks technical justification and may unnecessarily restrict material performance and innovation. Experience in adjacent states and elsewhere contradicts INDOTs approach. ACA is advocating a collaborative approach with INDOT to address their concerns. This briefing summarizes key technical considerations and ongoing efforts in the active investigation into the root cause of the bridge deck defects.