Displaying items by tag: Portland Limestone Cement

Stop press! The Portland Cement Association (PCA) has renamed itself as the American Cement Association (ACA).

Speaking to the audience at the IEEE-IAS/PCA Cement Industry Cement Conference taking place this week in Birmingham, Alabama, ACA president Mike Ireland said that the new name better represents its members, from the Atlantic seaboard to the Pacific coast. He added that the old name, the PCA, had caused the association confusion over the years with it being mistaken as only representing Portland, Oregon, or Portland, Maine.

This follows comments from Ireland to Global Cement Magazine in April 2024. At that time he also mentioned how changing levels of production of ordinary Portland cement (OPC) compared to blended cements had suggested a rethink. Surveys were then sent out by the PCA asking people what they thought about in connection to the association and which name suggestions they liked. A year or so later and the new name has arrived. Thankfully the PCA didn’t determine the name by public ballot alone, thereby avoiding the risk of a joke name. Readers wondering about this can remind themselves about the time the UK Natural Environment Research Council ran a website survey asking what a new polar research ship should be called. The vessel was eventually called the RRS Sir David Attenborough rather than the internet’s choice of Boaty McBoatface!

Global Cement Weekly also reflected upon the point Ireland made about the change in the blends of cement being used. The adoption of Portland Limestone Cement (PLC) production in the US contributed to the rise in blended cements shipments. United States Geological Survey (USGS) data shows that shipments of blended cements more than doubled from 26Mt in 2022 to 61Mt in 2024. This compares to shipments of OPC of 41Mt in 2024. This change appears to have been mostly accepted so far, but it is not without its detractors. For example, take this campaign promoting a return to traditional Type I and II cements on ‘performance’ grounds.

As for the US cement market, USGS data shows that shipments of Portland and blended cement fell by about 13% year-on-year to 11.8Mt in the first two months of 2025 from 13.8Mt in the same period in 2024. This was for both domestic shipments and imports. Most of the cement companies that have so far released first quarter financial results for 2025 reported poor weather adversely affecting sales. Holcim noted that sales improved in March 2025. Cemex blamed its lower sales volumes of cement and ready-mixed concrete on the period having one less working day compared to 2024. CRH pointed out in its analysts’ presentation that the first quarter of the year is typically the smallest of the four in terms of sales volumes. The really interesting data may start to emerge in the second and subsequent quarters, as the markets and supply chains start to react to current US trade policy. At the time of writing, widespread tariffs on many countries were announced at the start of April 2025 but then subsequently paused for 90 days.

The American Cement Association has a new name for the 21st Century. The PCA has served it well as a name for over 100 years, but now seems a good time for a change. Whether the future is one of blended cements, carbon capture, a return to OPC or whatever else remains to be seen. Yet the future of construction in the US looks set to involve plenty of cement. There are sure to be challenges along the way. Here’s to the next 100 years.

Taiwan: Taiwan Cement Corporation (TCC) and 100 construction firms have together launched the Low Carbon Construction Pioneer Alliance. CNA News has reported that the founding members eliminated 146,000t of CO₂ emissions altogether through their use of reduced-CO₂ building materials since November 2024. This includes despatches of 800,000m³ of Portland limestone cement (PLC) concrete by TCC, with 2.5Mm³ in cumulative orders to date. TCC first launched its PLC in October 2023, touting an emissions reduction of 15% compared to ordinary Portland cement (OPC). It since enlarged the net reduction to 24% through production modifications.

Taiwan Cement chair Zhang Anping said "TCC took the initiative to align with the Global Cement and Concrete Association and released the lowest-carbon PLC concrete in Taiwan. The CO₂ reduction is far greater than the 53% as defined by the government.”

US: The Portland Cement Association (PCA) has commended the Connecticut Department of Transportation's approval of Portland limestone cement (PLC), marking its acceptance in all US states and the District of Columbia. PLC, with increased limestone content, maintains traditional Portland cement's efficacy but reduces CO₂ emissions by up to 10%. The US avoided more than 4Mt of CO₂ emissions in 2023 by using PLC and other blended cements. This achievement coincides with growing cement consumption by state transportation departments, fuelled by the Bipartisan Infrastructure Law.

Mike Ireland, president and CEO of PCA, said "This milestone is a huge step forward for sustainable American construction. Switching to PLC promises to save millions of tonnes of CO₂. Using a lower-emission product that meets all the performance requirements of traditional cement means the construction sector can build with durability, safety and sustainability in mind."

US: Eagle Materials has outlined its climate change mitigation successes in its 2023 Sustainability Report. During 2023, the company increased its production of blended cement products, including Portland Limestone Cement (PLC). It commenced a major CO2 reduction study with the US Department of Energy, and established a Greenhouse Gas Reduction Team to explore new clean technologies. Eagle Materials says that it is currently working to increase the use of alternative fuels at three of its cement plants.

Canada: Lafarge Canada has transitioned its St-Constant, Quebec, cement plant to the production of OneCem Portland limestone cement (PLC). The producer expects the transition to reduce the St-Constant cement plant’s CO₂ emissions by 60,000t in 2024 alone.

Lafarge Canada (East) president and CEO David Redfern said "We are excited to take another crucial step in our sustainability journey. The transition to OneCem production at our St-Constant plant indicates Lafarge Canada's nonstop commitment to driving positive change within our construction industry. Our teams have been engaged in reducing our products’ environmental impact by embracing greener practices and materials."

UK: The World Cement Association (WCA) has welcomed the introduction of the revised BS 8500 standard, which allows for a wider range of Portland limestone cement (PLC) and ground granulated blast furnace slag (GGBFS) combinations in concrete. WCA chief executive officer Ian Riley, however, described the revision as ‘not breaking new ground but catching up.’ He called on the UK and other jurisdictions to begin enacting performance-based standards.

Riley said “It is good to see BSI making this change to concrete standards, however, this is still a very modest step forward. Firstly, ground limestone has been used successfully as a cement component in many markets for decades. Secondly, in order to produce concrete with the lowest embodied carbon and the highest circularity, we need to move away from standards that require particular recipes.”

Canada: Heidelberg Materials says that its integrated Delta cement plant in British Columbia has switched to exclusively producing its EcoCem Portland limestone cement (PLC). EcoCem PLC is a Portland limestone cement that contains up to 15% limestone and generates approximately 10% less CO₂ compared to other Portland cements. It has equivalent performance to ASTM and CSA standards for Type I/II Portland cement in strength and durability, and can be used in any application where Portland cement Type I is normally used.

Prior to the full transition to PLC production, the plant had already taken steps to reduce its CO2 emissions by using alternative fuels. The Delta cement plant has been in operation since the 1970s.

US: The United States Geological Survey has reported that the US consumed 40.5Mt-worth of cement shipments in the first five months of 2023. This corresponds to a 4.3% year-on-year fall from five-month 2022 volumes of 41.5Mt. Blended cement, primarily Type IL Portland limestone cement (PLC), accounted for 37% of shipments, compared to 16% in the corresponding period of 2022. Total demand rose by 4.3% year-on-year and by 19% month-on-month to 10.2Mt in May 2023. Imports of cement and clinker totalled 10.5Mt. The leading source of imported cement and clinker were Türkiye, which supplied 3.34Mt (32%), Canada, which supplied 1.58Mt (15%), and Vietnam, which supplied 1.3Mt (13%).

US production of clinker dropped by 2.1% to 29.5Mt in the first five months of 2023, from 30.1Mt a year earlier.

Nigeria: Lafarge Africa has applied to the Standards Organisation of Nigeria (SON) to use the product name Roadcem for its CEM-II Portland limestone cement (PLC) when sold in bulk. The Nigeria Tribune newspaper has reported that Lafarge Africa supplies PLC in bulk for use as a soil stabiliser in roadbuilding. It sells supplies the product bagged to retailers as Classic PLC.

SON certified Lafarge Africa's PLC under its Mandatory Conformity Assessment Programme.

US: Heidelberg Materials North America inaugurated its 2.4Mt/yr Mitchell cement plant in Indiana on 14 July 2023. The plant is equipped with a 3600 bag/hr rotary packer, and also boasts a 154,000t-capacity clinker storage dome. It will produce Heidelberg Materials North America's EcoCem Portland limestone cement (PLC), alongside other products. The producer said that the new plant will help to address US cement supply chain constraints amid a planned US$110bn infrastructure overhaul.

Heidelberg Materials North America president and chief executive officer Chris Ward said "The plant will reduce CO₂ emissions per tonne of clinker by almost 30%, mainly through operating on natural gas. Our investment in the Mitchell facility helps us lower our carbon footprint, while serving the growing demand for more sustainable products in this key market.”