On-Demand Course: Transition to Type IL Portland Limestone Cement (PLC)

Price: $ 39.00 USD

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INSTRUCTIONS: View the recorded webinar. Complete 10-question quiz with a score of 80% or higher to receive a certificate for 0.1 CEU (equivalent to 1.0 PDH).

Continuing Education Credit: 0.1 CEU (1.0 PDH)

Approved AIA and ICC

Access Period: 30 days


This is a recorded webinar from August 1, 2023.

The production of Portland cement emits carbon dioxide (CO2), which has been identified as a green-house-gas. Therefore, cement companies have been taking steps to reduce the CO2 output at their plants globally since the 1970’s, and more recently in the United States.

One way to reduce CO2 emissions is by eliminating the production of ASTM C150 Type I, and replacing it with an ASTM C595 Type IL Portland Limestone Cement (PLC). This presentation will address the fundamental reasons for the change, and from a quality perspective, how a cement plant might go about managing the change.

Additionally, the presentation will review concrete test data, compiled from varying cement plants and companies, with the intent of revealing why some may feel they have experienced issues with concrete compressive strengths, set times, and water demand, while others may report no significant changes to their concrete.

Ultimately, all will better understand the technical merits regarding this transition, and how to work successfully into the future with PLC.


Document Details

Author: Claude Bergeron

Publication Year: 2023


Categories: Cementitious Materials, Concrete Fundamentals, Materials, Mixture Proportioning

Formats: Online Learning

Table of Contents

Learning Objectives:

1. Describe industry initiatives to reduce carbon emissions through the CLEAN Future Act, H.R.1512 – 117th US Congress (2021 – 2022) and how this new Law impacts the cement and concrete industry.

2. Explain what a material’s Global Warming Potential (GWP) is, and why cement plants continually evaluate their GWP.

3. Discuss how finely ground limestone, although relatively inert compared to clinker or supplementary cementitious materials (SCM), will still contribute to the desirable properties of concrete.

4. Compare concrete data from the past two years, from two different regions of the United States, explaining why cement plants promote the transition to PLC as a ‘like-for-like’ transition.


Any applicable errata are included with individual documents at the time of purchase. Errata are not included for collections or sets of documents such as the ACI Collection. For a listing of and access to all product errata, visit the Errata page.

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Quantity Discount
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