November 2019, Volume 35, Issue 6 Print

President's Memo

Happy Halloween!! Well Summer is officially over, and it seems the cold is here to stay. Construction season here in Chicago will be coming to an end for the year, but not before the big fall push! Projects all over the area are trying to finish as much work as they can before the snow flies, which translates to a busy end of the season for all of us.

Right around this time every fall I like to reflect on the past year: Did I accomplish everything I set out to at the beginning of the year? What can I improve on? Who or what around me can I be thankful for that help me achieve my goals every day? As we get ready for holidays with family and friends, it is always nice to remind ourselves why we do what we do – personally, I enjoy getting to create and build something that will be used for generations after me!

This month will mark our third dinner meeting of the season, we welcome Jan Vosahlik and Jose Pacheco from CTL Group and look forward to their presentation on “Extended Workability for Concrete: Goals and Challenges” at Erie Café. Please check our website for details and registration – this should be a fun presentation, hope to see you all there!

A lot of us have just returned from the ACI-National Fall Conference in Cincinnati Ohio, where we gathered as industry leaders and academic professionals to collaborate on new ideas and technologies. Most of the ACI-IL Board were in attendance, preparing and learning for the Spring 2020 Convention being held in Rosemont in late March. It has definitely been a challenge, but we are very proud to host this next convention and look forward to making it a great success in the Spring!

Looking forward to seeing you all at our November 13th dinner meeting at Erie Café and don’t forget about our annual Toys for Tots event being held at a new location (DOC Wine Bar, Lombard) on November 20th – there will also be a special holiday presentation out in front of DOC Wine Bar that night!!

We are always looking for new volunteers to help us plan these events, if you want to get more involved or even join the board – please attend one of our open board meetings, which take place at 3:30pm before our dinner meetings.

Hope everyone is staying busy, and as the temperatures continue to drop – STAYING WARM!!

Best Wishes,

Peter J. Schroeder

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Calendar of Events

Monthly Dinner Meetings
Nobember 13 at Erie Cafe, Chicago
January 15 at Gibsons Oakbrook
February 26 at Erie Cafe, Chicago
April 15 at Gibsons, Oakbrook

Toys for Tots
November 20 at DOC Wine Bar, Lombard

2020 Spring Convention
March 29 - April 2
Rosemont, IL

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November Dinner Meeting

Title: Extended Workability for Concrete: Goals and Challenges


Presenters: Jose Pacheco Ph.D., Jan Vosahlik Ph.D.

CTLGroup, Concrete & Cement-Based Materials Group


Modern construction often requires that concrete mixtures for special applications are designed with extended workability. Common industry practice to evaluate extended workability consists of measurements of a concrete slump or slump flow at time intervals. Performance requirements for initial, interval, and final slump and slump flow are defined at the discretion of the specifier but vary greatly from project to project. Along the slump or slump flow evaluation, determination of other fresh properties and hardened properties are often required as part of the extended workability performance testing. In some cases, however, challenges related to the extended workability performance can lead to constructability issues such as plastic shrinkage cracking. This presentation will cover the current standard of practice for extended workability evaluations, strategies to achieve workability extension without detrimental effects to the hardened concrete performance, and present case studies in which the intended evaluation resulted in very different field performance.


Jan Vosahlik

Dr. Vosahlik specializes in the development, characterization, and evaluation of concrete mixtures, with focus on conventional, self-consolidating, high-performance, and other specialty concretes. He is an expert in rheology of cement-based materials, fresh concrete properties optimization and troubleshooting, and concrete pumpability. His technical work includes characterization of concrete air void system and assessment of freeze-thaw durability, implementation of new technologies in concrete mixture design, and use of novel test methods and characterization technique of construction materials. At CTLGroup, Dr. Vosahlik’s main focus is on design, development and troubleshooting of concrete mixtures, solving construction-related issues, deployment of new products in the construction industry, and research & development. Prior to joining CTLGroup, Dr. Vosahlik was a research assistant at Kansas State University. While there, he conducted research projects focused on improving construction practices and durability of local infrastructure.


Jose Pacheco

Dr. Pacheco has expertise in the development of high performance and conventional concrete mixtures for construction; construction troubleshooting; assessment and evaluation of concrete degradation mechanisms; and service life predictions for new and existing concrete structures. His other areas of technical work include moisture and transport properties of concrete, volumetric changes of concrete (creep & shrinkage), internal curing, and advanced characterization techniques. Dr. Pacheco specializes in providing solutions for asset owners, engineering firms, and contractors on several subjects including the selection and evaluation of construction materials, construction troubleshooting, durability performance of existing concrete and steel structures, and the selection of repair and mitigation techniques for extending service life. Prior to working at CTLGroup, Dr. Pacheco worked at the Dutch Institute of Applied Sciences (TNO) in the Netherlands as a consultant on civil engineering projects. His work focused on concrete durability and degradation, concrete materials evaluation, and concrete repair.


Please register by Monday, November 18th. If you are a Member, remember to login first to receive the member price. If you have any questions, please e-mail [email protected]


$65.00 Non-Member Attendee

$55.00 Member

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Toys for Tots

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October 2019 Meeting Recap

Dave Zwicke, Sr. Director & Regional Economist for the PCA gave another outstanding presentation at the October dinner meeting. Dave presented detailed information on the economic outlook for the local and national cement demand and construction trends for the next five years. Dave also discussed the possible impact that Federal and State infrastructure spending could have on cement consumption over the next few years.

In addition, Dave was assisted by Joe Chiappe the Great Lakes Economist for the PCA who gave an update on the residential market which showed a slowdown in single family construction and a minor increase in multi-family housing over the next few years. Dave presented information on non-residential construction and the possible impact of wood mid-rise buildings in the future. The presentation concluded with the cement consumption forecast for Illinois over the next five years that shows 1 % to 3% growth per year over the next 5 years.

We would like to thank Dave Zwicke and Joe Chiappe for their presentations. We would also like to thank the NIRMMA members who attended the dinner meeting.

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Troubleshooting: Solutions to Concrete Field Problems

When concrete starts to deteriorate, clients need a person who can think on their feet and come up with solutions...that's trouble-shooting.  In this course, participants will learn about real-life problems caused by inadequacies in design, construction, and maintenance practices.  Based on various problems, participants will learn how to come up with suitable solutions.

For more information or to register, click here.

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SEAOI/ICRI Seminar - Nov. 7th

A SEAOI/ICRI 2019 Assessment & Repair of Concrete Structure Seminar will be held on November 7th in Northbrook. For more information or to register, please click here.

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A Call To Arms!

We need your services - the ACI-National Convention is coming to Chicago on March 29th through April 2nd, 2020 – and we need your help!! The ACI-IL Board will be looking for volunteers to help in several key areas of the convention. Including manning our ACI-IL Chapter booth, helping to get people to the Tuesday night Mixer event (Bub-City Rosemont), helping with other local tours and special events. If you are interested in helping out, please attend any of our open board meeting which take place at 3:30pm before our dinner meeting each month.

Thank you for your help!!

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Is Your Member Info updated on Website?

Are you an ACI-IL Member? We hope you are.

The primary interest of the Illinois Chapter of ACI is technical education. The Chapter uses a variety of means, including the presentation of monthly dinner meetings that attract anywhere between 50 and over 100 people in attendance.  The dinner meetings are a great way to develop business and professional development and even earn pdh hours. Members receive a discount for attending.

Being a local member of ACI also gives you benefits at the national level at a much cheaper cost. As a local member, you can be listed in the national directory and have access to on-demand courses for pdh’s. You’ll also receive a free digital subscription to Concrete International magazine.

BUT….the information listed on our website needs to be complete with your name, address and e-mail address in order for ACI National to accept your enrollment. SO, if you are a member, login today and make sure your information is complete and up to date!

If you have any problems logging in, please e-mail [email protected] and we'll help you out.


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Upcoming Certification Sessions

Certification sessions are usually held at the ACI-IL Certification Facility: 650 W. Grand Ave., Elmhurst, IL 60126 - Suite 106

ACI-IL Certification programs include the following offerings:
Grade 1 Field Technician
Aggregate Lab Technician 1
Strength Lab Technician 1
Concrete Construction Special Inspector
Adhesive Anchor Installer
Adhesive Anchor Installer Inspector

Check the schedule below for a session or sessions of interest. Review the class listings below and register. Sessions are filling up quickly, so don’t delay!

12th - SCC Testing Technician, Elmhurst, IL
19th - Strength Lab Technician 1 - Millennia Lab, Warrenville, IL

See the ACI-IL website for course descriptions, registration forms and frequently asked questions at

If you need help registering just call (773)775-7558 and leave a message for our registrar Ms. Nicole Galati who will assist you with registration assistance, hotel recommendations and payment methods.

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Certification Sponsors

Thank you to our Certification Sponsors!

Certification GOLD Sponsors:

Certification SILVER Sponsors:

Interested in sponsoring?
Contact Pete Stamatopoulos at 630-804-9577.

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