For more than a century, The Monarch Cement Company has utilized advances in technology for smarter, more efficient processes that are also good for the planet. And now, Monarch is proud to offer Portland-Limestone Cement (PLC)—engineered to reduce carbon emissions by about 10% but with all the performance and resilience you’ve come to expect.
Used successfully around the world since the 1960s, PLC is a direct replacement for Ordinary Portland Cement (OPC) and can already be found in codes and standards across the U.S.
Plus, the manufacturing, application, and durability are the same (if not superior) to OPC, and PLC is produced by the same cement manufacturers, used by the same ready-mix producers, and placed using the same equipment.
Monarch PLC conforms to ASTM C595 and AASHTO M240 standards as a Type IL cement. Type IL cements are also permitted by codes such as ACI 318 for Building Code Requirements for Structural Concrete, ACI 301 for Specification for Structural Concrete, ASTM C94 for Specification for Ready Mixed Concrete, and by the AIA MasterSpec that is used by design firms to develop their specifications for private projects.
In 2021, The Monarch Cement Company built an approximately 100,000 square foot raw material storage building on its campus in Humboldt. The project utilized roughly 5,500 yards of concrete produced with approximately 1,500 tons of Monarch PLC. The placement, finishing, curing, and performance of the Monarch PLC proves that our Type IL is a direct replacement for our Type I/II Portland Cement that we have been producing since 1908.
A greener future
Your process doesn’t change! With no difference in workability, placement, or finishing characteristics, PLC mixes often result in less bleed water and shorter setting times.
Bleeding – Decreases with increasing fineness. Generally of no concern
Setting time (initial, final) – Chance of decrease with increasing fineness Not a concern even up to 15% limestone
How much Co2 can you save by using PLC? See for yourself with the PCA’s PLC Co2 calculator.
PLC is the next generation of traditional Portland Cement. If you’re interested in finding a more sustainable cement, which will reduce energy usage and Co2 emissions, contact us to learn more today.
After producing cement for more than 110 years, we’ve perfected the consistency and quality of our products. However, we’re always working to implement new technology-driven efficiencies to ensure we never stop improving.