Federal Highway Officials Release TechNote on Portland Limestone Cement
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The Federal Highway Administration (FHWA) has published TechNote Pub No: FHWA-HRT-23-104 on Portland Limestone Cement (PLC). The publication discusses the history of PLC in the U.S.; reviews the specifications – ASTM C595 and AASHTO M 240 – that address the chemical and physical requirements for the blended cement that can contain between 5 and 15% interground limestone; and discusses how PLC is manufactured with the associated reduction of emissions.
The TechNote discusses the engineering principles of nucleation, particle packing and chemical effects of PLC when used in concrete and discusses the impact on fresh and hardened properties of concrete, including volume stability and durability from various research studies. Several case studies discuss the successful use of PLC in concrete in transportation projects. The TechNote outlines some potential changes to concrete performance and suggests best practices to evaluate and test PLC in concrete mixtures. The bulletin was created to help state highway agencies (SHAs) and contractors get better acquainted with technical and background information regarding PLC and to promote its success stories nationwide.
Click here to access the TechNote.
