View this email in your browser      Forward this email to someone else
Graphic: CP Tech Logo



March–April 2021

Reducing Cement Content in Optimized Mixtures

Hot off the press is a March 2021 report on research that investigated the performance of concrete paving mixes containing reduced cementitious content. Work included both field and lab testing of the fresh mixture as well as of the longer-term performance for test sections of a MNRoad low-volume road. The study was sponsored by the National Road Research Alliance (NRRA) and conducted by the CP Tech Center.
Its key findings? While workability was marginal in the experimental mixture proportioned with 470 lb/yd³ of cementitious materials, the properties and performance of the test sections remained similar to that of the control section.

Two new guides on geotechnical cement released

Removing and replacing unstable or expansive soils to increase the durability of rigid and flexible pavements as well as structures costs time and money. The CP Tech Center's Guide to Cement-Stabilized Subgrade Soils, produced in collaboration with the Portland Cement Association (PCA), describes how cement-stabilized subgrade can economically and sustainably ensure a strong, nonexpansive subgrade across a range of climates.
Another CP Tech Center guide recently produced in conjunction with PCA is the Guide to Lightweight Cellular Concrete for Geotechnical Applications. This guide shows how portland cement and water slurry mixed with preformed foam to create air voids is a strong, lightweight, durable, and inexpensive alternative to soil or fill replacement, reducing ground settlement and improving embankments' bearing capacity as well as static and seismic stability.
Because lightweight cellular concrete is highly flowable, it is also useful in confined spaces where placing earthen fill is difficult—or even impossible.

Join upcoming CP Tech Center webinars
on Tuesdays at 12 pm (CST)

April 6: 
Understanding the value of competition

May 11: 
Best practices for recycled concrete aggregate (RCA)

All webinars offer Professional Development Hours (PDHs)
and are available for signup here.

(Previous webinar recordings, slide handouts, and speakers' Q&A responses are available here.)

Join upcoming National Concrete Consortium (NC²) webinars

Register now for the Spring 2021 National Concrete Consortium (NC²) Webinars to be held April 13ᵗʰ, 14ᵗʰ, and 15ᵗʰ beginning at 9:00 AM Central (CDT) each morning. PDH Certificates will be provided to attendees after the conclusion of the webinars. There is no cost to attend.

NC² meetings are open to all interested parties, including agency personnel, industry representatives, consultants, and academics. To be added to the mailing list for upcoming meetings, please contact Denise Wagner at 515-294-5798 or

CP Tech Center continues "traveling" virtually

Webinar presentations continue to play a key role in CP Tech Center technology transfer at the national, state, and local levels. 

At the national level, CP Tech Center director Peter Taylor and Kamran Amini (CTLGroup) led an American Concrete Institute webinar on salt scaling for 150 attendees on March 2ⁿᵈ.

In the CP Tech Center's most recent Concrete Pavement Technology Tuesday webinar on March 9ᵗʰ, Dr. Larry Sutter, PE (Michigan Technological University), Patricia Baer (Pennsylvania DOT), and Jim Casilio, PE (Pennsylvania Aggregates and Concrete Association) presented to 531 attendees on "Advancements in Our Knowledge and Action to Control Alkali-Silica Reaction (ASR) in Concrete Pavements."
At the state level, Peter Taylor and CP Tech Center Technology Transfer Engineer, Jerod Gross, held a National-Concrete-Consortium-sponsored concrete paving inspectors' workshop for the North Dakota DOT on February 23ʳᵈ–24ᵗʰ with more than 150 attendees total.
Jerod Gross also presented a webinar on March 2ⁿᵈ about “Optimizing Bases, Subbases, and Subgrades for Concrete Pavement” to an audience of 78 attendees for the Michigan Concrete Association's virtual workshop series.

At the local level, COVID forced the Winter 2020–2021 Iowa Concrete Lunch & Learn season online (versus its traditional format of one topic presented in person at various times throughout each quarter in ten different Iowa locations).This enabled this winter's Lunch & Learn season to address six different topics—and attract a record-breaking 1,509 total attendees from around the country.
For example, the March 5ᵗʰ finale webinar delivered by Jerod Gross and John Hart, Iowa DOT PCC field engineer, on the topic of PCC paving inspection included 309 agency, county, and consulting engineers.
Finally, in the CP Tech Center's own backyard, Peter Taylor served as guest speaker for a webinar on February 25ᵗʰ to 50 engineers-in-the-making enrolled in Iowa State University's "Design of Concrete" course.

Why and how to build with concrete for long-life pavements and bridges must be communicated not merely at the national level but also to our local engineers working on the ground—and to our engineers of the next generation. This is why the CP Tech Center values its involvement in all of the above.

Meet the board members

The CP Tech Center is housed within the Institute for Transportation (InTrans), Iowa State University’s hub of local, regional, and national transportation-focused research and technology transfer. InTrans' Director, Shauna Hallmark, is responsible for overseeing InTrans’ 15 centers and programs and represents Iowa State University on the CP Tech Center’s Executive Board of Directors.
Like CP Tech Center staff, Shauna has developed a wide range of workbooks, guidance documents, and other technology transfer resources related to her own research area of traffic safety. Shauna therefore strongly supports the CP Tech Center goal of reducing the time it takes for engineering research to become day-to-day practice by quickly getting proven new approaches and technologies into the hands of practitioners to start making a difference in the real world.

Paving Association Execs

Please forward this newsletter to your members as appropriate.
Copyright © 2021 National Concrete Pavement Technology Center. All rights reserved.

The goal of Resources is to let our partners know about publications and other products, events, and training opportunities provided by the National Concrete Pavement Technology (CP Tech) Center at Iowa State University.

CP Tech Center / 2711 S Loop Drive / Suite 4700 / Ames, IA 50010

Want to change how you receive these emails?
Update your preferences or unsubscribe from this list.

Want to join? Subscribe to this newsletter.