Georgia Chapter ACI, Newsletter
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April Newsletter

April 2016: Issue 4

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Friday, April 22, 2016
GA Chapter ACI Lunch Meeting
Concrete Overlay of Asphalt Parking Lots
Brian Killingsworth, PE
Sr. VP Div. Head Local Paving, NRMCA

Crowne Plaza Hotel, Atlanta Perimeter Ravinia
11:30 am Registration
12:30-1:30 pm Lunch Meeting
Information & Registration at:

Saturday, May 5, 2016
ACI Field Tech Grade I Training
TEC Services, Inc.
Lawrenceville, GA
8:00 am - 12:30 pm

Saturday, May 14, 2016
ACI Field Tech, Grade I Certification Exam
Lehigh Cement SE Lab
Doraville, GA
7:30 am — 2:00 pm

Saturday, May 21, 2016
ACI Aggregate, Strength & Lab Tech Training
TEC Services, Inc.
Lawrenceville, GA
8:00 am – 4:00 pm

Friday, May 27, 2016
GA Chapter ACI Lunch Meeting
ACI Certification Programs: Past, Present & Future

Crowne Plaza Hotel, Atlanta Perimeter Ravinia
11:30 am Registration
12:30-1:30 pm Lunch Meeting
Information & Registration at:

Saturday, June 4, 2016
ACI Field Tech Grade I Training
TEC Services, Inc.
Lawrenceville, GA
8:00 am - 12:30 pm

Saturday, June 11, 2016
ACI Field Tech, Grade I Certification Exam
TEC Services, Inc.
Lawrenceville, GA
7:30 am — 2:00 pm

Saturday, June 18, 2016
ACI Aggregate, Strength & Lab Tech Exams
TEC Services, Inc.
Lawrenceville, GA
7:30 am – 4:00 pm

Thursday, June 30, 2016
GA Chapter ACI
Vigil D. Skipper Seminar
Bluegrass Materials
1505 Ronald Reagan Blvd.
Cumming, GA 30041
8:00 am Registration
8:30 am – 11:30 am Seminar, RM Plant & Quarry Pit Tour
11:30 am Jim & Nicks BBQ Lunch
Information & Registration at:
Saturday, July 2, 2016
ACI Field Tech Grade I Training
TEC Services, Inc.
Lawrenceville, GA
8:00 am - 12:30 pm
Saturday, July, 2016
ACI Field Tech, Grade I Certification Exam
Thomas Concrete GA Lab
Atlanta, GA
7:30 am — 2:00 pm
Saturday, July 30, 2016
ACI Masonry Lab & Field Tech Training
S&ME, Inc.
Duluth, GA
8:00 am - 12:30 pm
Saturday, August 6, 2016
ACI Field Tech Grade I & Strength Tech Training
TEC Services, Inc.
Lawrenceville, GA
8:00 am - 12:30 pm
Saturday, August 13, 2016
ACI Field Tech, Grade I & Strength Tech Certification Exam
Thomas Concrete GA Lab
Atlanta, GA
7:30 am — 2:00 pm
Saturday, August 27, 2016
ACI Masonry Lab & Field Tech Certification Exam
S&ME, Inc.
Duluth, GA
8:00 am - 12:30 pm
Important Note:  ACI Training & Exams are for
Pre-registered Persons Only.
**No walk up seating available**
For Information go to:

2016 Georgia Chapter Officers:

Wilbur Bragg, P.E. 
McVeigh & Magnum Engineers

Vice President:
Wayne Wilson, P.E. 

Nadia Groome

Ralph Hodgins

Board of Directors:

Leif Owens
Wheeler Services

Bill O'Hora
Nova Engineering and Environmental

Tom Pfeifer, P.E.
Uzun & Case Engineers

Rick Tilson
Argos Ready Mix

Justin Lazenby
Thomas Concrete

Daniel Kuemmerle, P.E.  

Immediate Past President
Angela San Martin, P.E. 
Metromont Corporation

President's Message

It is springtime! Pollen is covering everything, and maybe construction dust will float around too (but not enough to get any contractors in trouble). The weather is warming, but as I write this it has gotten a little colder again. Sunday morning my neighbors’ flowering shrubs are covered with sheets, drop cloths, and beach towels. Hopefully we do not have to worry about cold-weather concrete placement anymore this year.

Springtime also means the start of the baseball season. The structural engineering department in my office went to the Atlanta Braves season opener. The weather was perfect. On the way to and from Turner Field, we drove by the SunTrust Stadium under construction which is about halfway complete. On the way to last month’s GA ACI meeting, I was stopped at a traffic signal at the new stadium. I was amazed that a flatbed semi-truck carrying double-tees did a U-turn in the intersection on US 41. The precast is for a parking deck under construction beside the stadium.

Last week a bunch of coworkers went to lunch together. Our long fixed-in-place table had a concrete top.  Clear and tinted aggregate was used. Of course, beer bottle bottoms were embedded but exposed on the surface. A couple of beer bottle cross-sections were also visible on the surface. The top was beautiful, and even the non-structural people were commenting on it. This shows the versatility of concrete: from a simple tabletop to the structures for large buildings.

GA ACI hopes you can attend the April 22 meeting. The topic is “Bonded Concrete Overlays of Asphalt Parking Lots” to be given by Brian Killingsworth, P.E., NRMCA’s senior vice president, local paving.  Deteriorated asphalt parking areas can be made almost new again with bonded concrete overlays. A few months ago, my office’s asphalt parking lot was resurfaced. The area was simply “painted” with asphalt and re-striped; the cracks were not even filled in.

I would like to repeat my request from last month. The Georgia Chapter ACI is starting our second half century and our membership year. If you are not yet a member or are a past member who has not renewed yet, please visit our website for more information on how to start or to renew your membership. Wayne Wilson has some wonderful topics lined up. The Skipper Seminar is on June 30 and will be tours of a concrete plant and a quarry (can you say “yabba dabba doo?”).

Wilbur C. Bragg, II
Georgia Chapter ACI, President

March Luncheon Recap 

The room for our March Meeting was a little weird and/or different being on the third floor of the hotel right next to the pool and fitness center. Speaking of being a little different and weird, our meeting presenter this month was long time GA Chapter Member and my dear friend Gary Knight. Gary gave us a run down on a fresh way to look at concrete mixture analysis by re-thinking the traditional approach of strength vs. water/cement ratio. His presentation can be found here

Gary opened with a review of the traditional approach of looking at w/c ratio, first proposed by Duff Abrams in 1918. This approach has become known as Abrams’ Law; “For a given set of materials and conditions, the compressive strength of concrete depends solely on the relative quantity of water compared with the cement”.  Vance Dodson later proposed looking at something call the Omega Index Factor (OIF) which looks at the Cement Factor (portland cement only portion of a mixture) divided by the w/c ratio. Gary mentioned Vance’s book Concrete Admixtures, as being an excellent resource.

Gary then showed us some traditional w/c ratio & OIF mixture comparisons to illustrate how they vary and present data differently.  One big advantage of the OIF approach of looking at mixture performance is the ease at which you can evaluate a given mixture component’s performance in a concrete mixture. Gary showed us several examples of past chemical admixture and fly ash concrete mixture evaluation trials in which he used the OIF approach to gage each materials relative performance in a particular mixture. He also mentioned how easy it was, once you have a gage of relative performance, to relate that performance to actual concrete mixture cost.

Gary then closed with some OIF theory notes and parting thoughts, summarized as follows:
  • In the original Vance Dodson work fly ash substitution rates were done on equal volume not weight.
  • When adjusting aggregate volume to maintain mixture yield, maintain the aggregate size percentages to keep the aggregate gradation constant, i.e. don’t just adjust sand volume for yield.
  • Keep constant slump for best comparison.
  • Remember, Cement Factor is portland cement only and does not include SCM’s
  • Overall goal, when evaluating a given set of materials, is to change only one aspect of the mixture proportion at a time.
After several group questions, Georgia Chapter Vice President Wayne Wilson closed the meeting by thanking everyone for their attendance and presenting Gary with his very own GA Chapter Speakers Cup.

Georgia Chapter Members to be Honored at Spring ACI Convention in Milwaukee, WI

Henry L. Kennedy Award
“for outstanding leadership in the development of a standard for repair of existing concrete buildings and in recognition of his research contributions for repair of concrete and masonry structural members”
Lawrence F. Kahn, FACI, is Professor Emeritus at the School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA. He retired after 39 years at Georgia Tech in 2015, and is now an affiliated consultant with Wiss, Janney, Elstner Associates, Inc., Atlanta, GA. He is a Past Chair of ACI Committees 364, Rehabilitation, and 562, Evaluation, Repair and Rehabilitation of Concrete Buildings, and has also served on the ACI Technical Activities Committee; the Concrete Research Council; ACI Committees 440, Fiber-Reinforced Polymer Reinforcement; 546, Repair of Concrete; and 563, Specifications for Repair of Structural Concrete in Buildings; and Joint ACI-ASCE Committee 441, Reinforced Concrete Columns. He was President and Vice President of the Georgia Chapter – ACI.  Kahn received the ACI Delmar L. Bloem Distinguished Service Award in 2013 and was elected a Fellow of ACI in 1983. 

He also is a Fellow of the American Society of Civil Engineers (ASCE) and The Masonry Society (TMS). His research interests include durability of prestressed concrete bridge structures and seismic resistance and repair of structural masonry and concrete.  Kahn received his BSCE from Stanford University, Stanford, CA, in 1966; his MSCE from the University of Illinois at Urbana-Champaign, Champaign, IL, in 1967; and his PhD in civil engineering from the University of Michigan, Ann Arbor, MI, in 1976.

ACI Fellow
An ACI Fellow is an individual who has made “outstanding contributions to the production or use of concrete materials, products, and structures in the areas of education, research, development, design, construction, or management.”
Gary F. Knight is the Technical Service/Quality Control Manager for Lehigh Cement, South Division in Atlanta, GA. He started with Heidelberg (Lehigh) Cement in 2006 and has worked directly in the cement, concrete, and aggregates industry since 1986. He is a Past Chair and member of ACI Committee 211, Proportioning Concrete Mixtures, and has also served on the Committee on Nominations; and ACI Committees 214, Evaluation of Results of Tests Used to Determine the Strength of Concrete; 237, Self-Consolidating Concrete; 302, Construction of Concrete Floors; and 522, Pervious Concrete. His research interests include concrete mixture optimization and calorimetry.

Knight received his degree in civil engineering from Southeastern Massachusetts University, South Dartmouth, MA, in 1973. He is a voting member of ASTM International Committees C01, Cement, and C09, Concrete and Concrete Aggregates. He is the author of the “Concrete Mix Evaluator” computer program for proportioning concrete mixtures. Knight received a Certificate of Merit from the Precast/Prestressed Concrete Institute (PCI) for contributing support to the PCI SCC FAST TEAM in 2004.

Concrete International Magazine Article 

This month in Concrete International…..
Reprinted from the April 2016 issue of Concrete International with permission from American Concrete Institute (

This month’s article, “Caliche: Nature’s Natural Concrete” was chosen mainly because I thought it was really cool and because the Casa Grande Ruins photo on page one of the article caught my eye. Why did a Ruins picture catch my eye? My daughter, a Senior at Peachtree Ridge High School, has been accepted into the School of Archeology at The College of Charleston for the upcoming fall semester. 
A massive structure known as the Casa Grande Ruins was built in the 1300s near Coolidge, AZ. The material used to construct Casa Grande was caliche, a natural-occurring clay soil containing calcium carbonate and small percentages of sand and small rocks. For construction purposes, the caliche soil was mined in large lumps, broken into smaller pieces, and mixed with water to make a caliche slurry. Test results for mortar cubes produced using a small sample of caliche are reported, showing that the material has a relatively high compressive strength…


Skipper Seminar Save the Date

Date: Thursday June 30, 2016

Time: Registration — 8:00 a.m.
           Seminar, RM Plant & Quarry Pit Tour — 8:30
           a.m. to 11:30 a.m. 
           Jim & Nicks BBQ Lunch — 11:30 a.m. to 1:00

Location: Bluegrass Materials Quarry Training Room 
                 1505 Ronald Reagan Blvd
                 Cumming, GA 30041 

*PPE will be required. Please bring hardhats, glasses, boots, and vests. Bluegrass will have a limited quantity available. 

April Meeting 4/22/16

Be sure and join us on April 22, 2016 for a presentation by Brian Killingsworth, P.E., NRMCA's senior vice president, on "Bonded Concrete Overlays of Asphalt Parking Lots." 

Click here to register today!
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