ACI November Newsletter (copy) Print

President's Report

Are you tired of the Halloween stuff yet? Not to worry it seems the stores are trying to get a real jump on Christmas this year as I noticed Christmas Trees, decorations and holiday lights out at our local Home Depot last week! I can remember my Mom watching a QVC “Christmas in July” special 20 years ago and thinking this is the craziest thing ever. With the way things keep happening so fast, maybe not so crazy thinking anymore?

By all accounts it looks like our joint lunch meeting with GA ICRI was a success, thanks to Joshua Lloyd for putting the program together for us.  Chapter member and Student Scholarship Chairman, Kelly Roberts is soliciting submissions for this year’s GA Chapter ACI Student Scholarships. Every year our Chapter awards $7500 in scholarship money to two deserving Collage Students currently enrolled in a concrete related program in Georgia.  The Scholarships are named for deceased member legends Robert H. Kuhlman and LaGrit F. “Sam” Morris, look for submittal information in this newsletter.

Speaking of scholarships, registration for our annual Scholarship Fundraising Clay Shoot is well underway. The event is set for Friday, November 10 at the Etowah Valley Sporting Clays Park in Dawsonville, GA. Steven Maloof is bringing his newly christened smoker to cook an expected delicious BBQ Lunch for us.

Remember to mark your calendars, as our last two Friday Lunch Meetings for 2017 occur a little earlier in the month to avoid Thanksgiving and Christmas: November 17 & December 15. Also look out for our 2018 Ballot for Officers which are due in by December 8. Look forward to seeing you all in Dawsonville on November 10.

Take care and be safe out there,

Wayne M. Wilson, PE
Georgia Chapter ACI, 2017 President

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Luncheon Recap

We had our sixth lunch meeting of 2017 this year at Maggiano’s in Dunwoody.  We had a big group of people in attendance as it was a joint meeting with the local chapter of ICRI. The presentation was given by C.W. Matthews Contracting Company, Inc., who did the demolition and reconstruction of the I-85 bridge segment that collapsed. Our speakers were Adam Grist, who is the Vice President of Structures for C.W. Matthews and Mark Dolan, who is a Senior Structures Engineer at C.W. Matthews. Click here to view the presentation.

The presentation showed the bridge on fire and the collapse interspersed with a few personal anecdotes. Further information gave the background of the incident, firefighting, clean up, and the investigation that had to take place. After that there was a very interesting segment on the demolition of the bridge spans affected by the fire, using a machine that crushes concrete. There was also a careful selective demolition of columns to ease reconstruction efforts.

The presentation also went into the planning that was going on at the same time as the demolition. This included the decision to use the existing 1980’s drawings and to expedite the ordering of precast concrete girders from plants in Savannah and Atlanta. There was a lot of very effective collaboration from the Georgia Department of Transportation and the engineers involved in this effort. 

Various aspects of the reconstruction were discussed such as the enlarging of the columns to ease construction and minimize demolition. A film showing the whole placing sequence of girders and topping was shown and a discussion of special rules on precast girder delivery being waived and the great amount of work involved in completing the project well before expectations.

In closing, 2017 Vice President Tom Pfeiffer presented Adam and Mark the GA Chapter Travel Mug and thanked everyone for their attendance. There were a number of good questions and comments on this very interesting topic that greatly affected our commutes in Atlanta.

Upcoming luncheon dates for the rest of the year are below: 

  • November 17
  • December 15

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Our Next Event

Be sure and join us on November 17, 2017 for a presentation by Steven J. Stokowski, PG on New Diagnostic Observations for Concrete Petrography! 









Speaker: Steven J. Stokowski, PG

www.linkedin.com/in/stevenstokowski/
cell: 508-259-3536    
email: sstokowski@tecservices.com

Steve is the Principal Petrographer with TEC Services, Lawrenceville, GA.  Steve has extensive petrographic experience with historic, modern, and cutting-edge concrete. He has a MS in Geology from the South Dakota School of Mines and Technology. Steve is the past or present Chair of AEG-Atlanta, AEG-BWH, SME-DC, and NESM. He is Registered or Certified as a Geologist in Georgia, Maine, Virginia and other states.

Note: AEG is the Association of Environmental and Engineering Geologists
SME is the Society for Mining, Metallurgy, and Exploration
NESM is the New England Society for Microscopy

Program: New Diagnostic Observations for Concrete Petrography 

Changes in concrete technology make this an exciting time to be a concrete petrographer, as illustrated by four case histories. First, we investigated many cases of early scaling of the top of concrete sidewalks and a road. These projects used concrete with a state-mandated mix design containing 70% GGBFS (ground-granulated blast furnace slag, a pozzolanic replacement for portland cement, PC), but had different contractors. The scaling was due to leaching and migration downward of portlandite (Ca(OH)2) before it reacted the GGBFS, which had greater crystallinity than normally observed, so was unlikely to be very reactive.  Portlandite is a PC hydration product essential for the pozzolanic chemical reaction with GGBFS that results in concrete durability.  We suspect that the GGBFS was a defective import, instead of the product previously made at the Sparrows Point Steel Mill in Baltimore, which closed. 

The second case history involves Alkali Carbonate Reactively (ACR). A precast, prestressed concrete product exhibited pattern cracking in less than one year, an unusual situation, especially given that the coarse aggregate was relatively pure dolomite. ACR occurs primarily with argillic dolomitic limestones. There are a few reported cases of ACR with pure dolomites in the US and worldwide that are debated for a variety of technical and economic reasons. In this case, the dolomite aggregate in the concrete contains partially dissolved dolomite crystals, microcracks filled with calcite ((CaCO3)2) that extend from the aggregate into the cement paste, the aggregate and surrounding cement paste has an elevated potassium (K) content suggestive of a chemical reaction with the K component of the cement, and there are isolated concentrations of EDX-identified magnesium (Mg) suggestive of Brucite.  In the third case history, we used minor occurrences of ASR (Alkali Silica Reactivity) in concrete as an indicator of minimum relative humidity.  

The associated projects investigated the widespread deterioration of concrete foundations made with aggregate containing pyrrhotite (Po). Po is an unstable mineral with time in the presence of oxygen and moisture. While it is reasonable to presume that a concrete foundation would have a high relative internal humidity, this is not a given because the foundations have a bituminous moisture barrier adjacent to the soil. Work by Stenger (1982[1]) established that 50% is the minimum relative humidity for Po oxidation. Observation of minor ASR reactions with slate in the PC allowed the historic relative humidity to be great enough to oxidize Po because Stark (1991[2]) established that the minimum relative humidity in concrete for ASR at 70%.  In the fourth case history, in super-plasticized, low w/c mixes we recognized an association of low cement hydration and concrete microcracking adjacent to coarse aggregate that was batched dry and absorbed water from the mix.  This is essentially the opposite of the concept of internal curing, where wet, absorptive rock causes better hydration of cement.

[1] Stenger, H. F., 1982, Oxidation of Sulfide Minerals VII. Effect of Temperature and Relative Humidity on the Oxidation of Pyrrhotite: Chemical Geology, V. 35, p. 281-295

[2] Stark, D., 1991,The Moisture Condition of Field Concrete Exhibiting Alkali-Silica Reactivity: CANMET/ACI Second International Conference on Durability of Concrete, SP-126, American Concrete Institute, p 973- 987


The Georgia Chapter ACI hosts monthly luncheon meetings throughout the year. Luncheons are an opportunity to network with your peers, earn Professional Development Hours and further your industry knowledge.

11:30 am – Registration
12:00 noon – Luncheon

*Walk-Ins will be charged $45.00
Please register by Wednesday, November 15, 2017.

Click here to register!

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Scholarship Announcement

Georgia Chapter ACI Robert H. Kuhlman and LaGrit F. "Sam" Morris Student Scholarships

Every year, the Georgia Chapter of the American Concrete Institute (ACI) awards one $5,000 scholarship and one $2,500 scholarship to a local undergraduate or graduate student that has an interest in the areas of concrete technology, materials, design, construction or any combination of these areas.

Qualification: Undergraduate or Graduate students attending school full?time in Georgia.  At the time of application, the applicant shall have been accepted to an accredited college or university and pursuing a degree in engineering, architecture, construction management, material science, or other relevant degree.  As a condition of accepting this scholarship, the applicant is expected to give a 30?40 minute presentation at one of the monthly Georgia Chapter ACI luncheons.  The topic of the presentation may be on the student’s research or thesis topic or other area of interest related to the concrete industry.

All completed applications for ACI scholarships will be reviewed by the board. Applicants chosen
to receive awards will be notified by the end of January and the award will be presented at the
annual ACI Awards Ceremony in January.

All applicatons must be submitted by December 8, 2017.

Download the Application here.

Contact Kelly Roberts with questions.

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Scholarship Clay Shoot

ACI Georgia Chapter – Scholarship Fund

2nd Annual Sporting Clay Shoot
Friday November 10, 2017 Etowah Valley Sporting Clay Park
Dawsonville, Georgia

This will be the second annual shooting event in the Chapter’s history!
We can all get together, enjoy the beautiful fall weather, SHOOT FLYING OBJECTS, then have a nice lunch!

Registration begins at 7:30 am
Shotgun Start at 9:00 am

Cost: $125.00 per Shooter

Includes firearm rental, 100 clays at over 14 stations, golf cart and lunch!

Prizes for 1st and 2nd place teams!

Sponsorship of each stand is available! Space will be limited to 56 Entries!

Click here to view the event flyer.

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KSU ASCE Competition Sponsorship

Want to Sponsor the KSU ASCE Competition Team?

The American Society of Civil Engineers (ASCE) Student Chapter at Kennesaw State University (KSU) is involved in providing students with the opportunity to learn more about construction and civil engineering, connect students with the outside community of practicing engineers and prepare students to interact in a professional environment. Our goals are to provide the students with monthly scholarly meetings with outside practitioners, to cultivate community among the engineering students, and to reach out to the younger community.

Within ASCE there are three competition teams: Steel Bridge, Concrete Canoe, and Minor Competitions. Each team’s success is predicated on the other team’s success and we all work together to help each other to complete tasks and meet deadlines. Each team member dedicates at least all day every Saturday, with most dedicating Fridays and Sunday afternoons to make competing possible. Having a successful team also takes funding from sponsors. Each year, our competition teams spend upwards of $50,000 in material procurement, tools, competition related fees and travel.

 

This year’s Southeastern Regional Conference Competition is being hosted by University of Florida (UF) in Gainesville, FL and we expect to have a larger team then the previous year of 44 students traveling; this means travel expenses are going to be great. Any money donated would go to helping these hardworking students get the opportunity to compete at the regional level. While any amount of assistance will be greatly appreciated, the attached flyer outlines the benefit to the team and the sponsor’s benefits.  Please consider supporting the KSU ASCE Competition team.

Click here to fill out a sponsorship form.

If you have any questions, please contact Megan Moody at mmoody11@students.kennesaw.edu or 770-893-9559.

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Concrete International Magazine Article

This month in Concrete International…..
Reprinted from the November, 2017 (V. 39 No. 11) issue of Concrete International with permission from American Concrete Institute (www.concrete.org)

Position Statements from the Concrete Polishing Council of ASCC

The American Society of Concrete Contractors has Concrete Polishing Council as one of its four main specialty councils.  The CPC has brought together polishing and slab construction contractors to understand each other and work together to make a product owner’s will be happy with.

This article explains some of the background of this venture, explains several technical aspects of polishing, and talks of coordination of subcontracts in these three separate position statements within the article.

Link to article: https://www.concrete.org/publications/getarticle.aspx?m=icap&pubID=51701245

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Outside the Cylinder

“Opus Caementicium Pars Duo”  

Back in May we discussed Roman Concrete (Opus Caementicium in Latin).  Since then, there was an interesting article in Nature, so I felt we should revisit for Part Two (Pars Duo).

The island of Surtsey, off the southwest coast of Iceland, is made of volcanic rock which has the same ingredients as Roman concrete.  Surtsey is unique because it was formed of heat, volcanic material, and seawater, which creates hydrothermal minerals that cause the rocks to be strong.

A group of scientists plan to travel there and do some drilling to get samples to try to further understand Roman concrete and its qualities.  They also plan to bring some warm clothes with them.

Roman concrete contained volcanic ash and seawater, though the exact mixture and full list of ingredients is still elusive.  The idea of this mission is to look at this island that is made of volcanic ash, of very similar type, and naturally it is in seawater.  Findings could provide some missing ingredients to make a very strong and durable concrete mix. 

Scientists will drill two holes, one straight down, and one at an angle.  They will then study the influence of microbial life inside the volcanic rock but more importantly, how minerals are formed, which may provide them a window of understanding.

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ACI Awards

 

Submit YOUR Project for next year! 

You can now upload project materials throughout the year in your own private folder through Google Drive! Simply contact ngroome@gaconcrete.org and she will create & share a folder with you where you can compile all your submission materials as you go. 

This will make it easy to organize everything throughout the year as you prepare for your submission.

Click Here for Google Drive Submission Instructions.

2017 Project Submission Form.

The ACI Awards Program is your chance to show off your organization's expertise and ingenuity. ACI Award winners are recognized as industry leaders invested in advancing the design and construction of concrete structures. 
 
Submitting your project is an opportunity to:

  • Promote your industry partners and share the good work they do
  • Share new technologies your organization is utilizing


Award winners will receive:

  • recognition in Georgia construction publications
  • recognition on Georgia ACI website
  • recognition and awards plaque at the annual awards banquet


Eligibility:


All architects, engineers, contractors, developers and industry-related professionals are eligible to enter this competition. Projects to be nominated must have been completed between January 1, 2016 and October 31, 2017 and be located in the state of Georgia. 

There is a $95 cost per entry.  

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Calendar of Events

Saturday, November 4, 2017
ACI Field Tech, Grade I & Strength Tech Training
TEC Services, Inc.
Lawrenceville, GA
8:00 am — 2:00 pm 

Friday, November 10, 2017
GA Chapter ACI Scholarship Fund Raising Clay Shoot
Etowah Valley Sporting Clays Park
619 Sporting Hill Drive
Dawsonville, GA

7:30-8:00 am Registration
8:00-12:00 pm Shoot
12:30 pm Lunch

Meeting Information and Registration available at: www.aci-ga.org

Saturday, November 11, 2017
ACI Field Tech, Grade I & Strength Tech Certification Exams
Lehigh SE Concrete Lab
Doraville, GA
7:30 am — 2:00 pm

Friday, November 17, 2017
GA Chapter ACI Lunch Meeting
What’s New in Concrete Petrography
Steve Stokowski, PG, Principal Petrographer, TEC Services

Westin Atlanta Perimeter North
7 Concourse Parkway NE
Atlanta, GA 30328

11:30 am Registration
12:00-1:30 pm Lunch Meeting
Meeting Information and Registration available at: www.aci-ga.org

Saturday, November 18, 2017
ACI Lab Tech, Aggregate & Concrete Certification Exams
TEC Services, Inc.
Lawrenceville, GA
7:30 am — 2:00 pm

Saturday, November 18, 2017
ACI Flatwork Finisher Training & Certification Exam
Argos Concrete Lab
Cumming, GA
7:30 am — 2:00 pm

Saturday, December 2, 2017
ACI Field Tech, Grade I & Strength Exam Review Workshop
TEC Services, Inc.
Lawrenceville, GA
7:30 am — 2:00 pm

Saturday, December 9, 2017
ACI Field Tech, Grade I & Strength Tech Certification Exams
Ready Mix USA Concrete Lab
Woodstock, GA
7:30 am — 2:00 pm

Friday, December 15, 2017
GA Chapter ACI Lunch Meeting
Annual Holiday Reception &
Scholarship Winner Presentations

Westin Atlanta Perimeter North
7 Concourse Parkway NE
Atlanta, GA 30328
11:30 am Registration
12:00-1:30 pm Lunch Meeting
Meeting Information and Registration available at: www.aci-ga.org

Important Note:  ACI Training & Exams are for
Pre-registered Persons Only.
**No walk up seating available**

For Information on any of our exams or events go to: www.aci-ga.org

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