The Kentucky

Ready Mixed Concrete Association

1 HMB Circle ● Frankfort, KY 40601 ● Phone: 502-695-1535 ● Fax: 502-695-9499 ● Web: www.krmca.org July 2016

Calendar of Events

ACI Level I Classes

July 26,

August 23,

September 22,

2016

KRMCA Summer Meeting

Jenny Wiley State Resort

Park– Board Meeting on

July 21

July 20-24,

2016

KRMCA Fall Board

Meeting—Naples, FL

November 9-

13, 2016

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August 2016

The KRMCA wishes you and your

family a safe and happy

Independence Day!

KRMCA Summer Meeting is Fast Approaching!

In just three weeks, the KRMCA will be holding its Annual Summer Meet-ing. This year’s event will be held at the Jenny Wiley State Resort Park on Dewey Lake in Pres-tonsburg, KY. The event will begin on Thursday, July 21, 2016, with early

arrivals coming in on Wednesday, July 20th, and will end on July 24, 2016. This event will be filled with food and fun for the family, while important association business will be conducted. This year, there will again be golf for those that would like to play at the renowned StoneCrest Golf Course, a beautiful mountain top course built on a reclaimed strip mine. There KRMCA has reserved tee times for both Friday and Saturday– when you arrive, you will be able to reserve your time at the registration desk. There will also be swimming and boating, and events for the whole family. This year, the kids will enjoy learning how to throw tomahawks, how to make primitive fires and how to make cobra braid survival bracelets. Also of note for family events is the Jenny Wiley Theater, next to the Jenny Wiley Convention Center (where KRMCA events will take place). During the KRMCA Summer Meeting, there will be two plays available to see at the thea-ter– Mary Poppins and 9 to 5. Please visit the theater website for ticket infor-mation (http://www.jwtheatre.com/). Hopefully you are planning on joining the KRMCA for this fun-filled event! If you have any questions, please contact the KRMCA Office. Please see page 6 for the tentative schedule of events. See you in a couple weeks!

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Specializing in Risk Management for the

Ready Mix Concrete Industry

Services Include:

Loss Control

Driver Training

Unique Marketing Approach

Risk Retention Programs

Business Income Analysis

In House Claims Service

BOWLING GREEN LEXINGTON

1240 Fairway Street 181 Prosperous Place

P.O. Box 1779 Lexington, KY 40509

Bowling Green, KY 42103

NASHVILLE OWENSBORO

830 Crescent Centre Drive 2009 Frederica Street

Suite 260 P.O. Box 785

Franklin, TN 37067 Owensboro, KY 42302

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Aggregate Mineral Fillers for Use in Concrete Mixtures– PART 2 Tim Kaiser, Cemex

The CONCRETE. When the source of material is different than the fine aggregate source, it is recommended to apply the different specific gravity of the material in the volume calcu-lations. The quantity of mineral filler material, as portion of the blended or manufactured sand, is factored in to the fineness modulus equation. The procedure generally follows ACI 211.1 steps, with an additional line showing the mineral filler component as part of the powder content. Mixture proportions should use a combined gradation tool, such as the Power 45 Chart, to display the physical characteristics of the total aggregate in the concrete mixture. A few definitions are provided to explain some of the terminology related to mixture proportion-ing. Powder Content is the total volume of cementitious material and mineral fillers in a con-crete mixture which are finer than the No. 20 Sieve, including the fine materials contained in the natural sand and coarse aggregate. At a constant water/powder ratio, an increased powder content usually improves workability. Paste Content is the volume of powder and water in a concrete mixture. Higher paste con-tents tend to result in increased unit shrinkage. Packing Density is a value which, when increased, usually requires less water to fill the voids between the solid particles. However, some water is also needed to provide separa-tion between these particles, making it difficult to predict the ideal density, which contrib-utes to optimal strength. Considering the higher fineness of the blended fine aggregate, the water demand of the

concrete mixture is expected to be higher, and the concrete must be tested to show that

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Aggregate Fillers Continued from Page 3... no more than 120% of the water was required to achieve the same workability, as compared to the control mixture. When different sources of DoF mineral fillers have the same fineness, the source with a lower Methylene Blue value may demon-strate improved workability and slump retention. Concrete mixtures exhibiting the same packing density do not necessarily correlate to equivalent workability, as it is more dependent upon particle shape and size. While the higher fines content from the aggregate may cause a reduction in work-ability, slump can be increased using either an in-creased water content or an adjusted admixture dosage.

Some producers may consider including the AMF material volume in with the total powder content, which can increase the admixture content per cubic yard without changing the dosage per hundred pounds of cementitious materials. Depending on the workability and bleeding characteristics of the concrete mixture, the total powder content may be adjust-ed (higher or lower, depending on specification language). While the AMF materials are not cementitious materials, if the producer intends to include the AMF material with the cementitious materials content to determine the total powder content in mixture propor-tioning, it is suggested to calculate based on a target volume, rather than on a target mass. Proportions based on equivalent mass will result in a higher powder volume, which may be detrimental. The setting characteristics of mixtures contain-ing AMF materials are generally assumed to be similar to those of the control mixture when the water content, powder content and admixture content remain consistent with the control mix-ture. The uses of higher percentages of miner-al filler in a blended sand are expected to re-quire adjustments to several proportioning fac-tors. Conducting concrete trial batches is nec-essary to properly determine the effects on the fresh and the hardened concrete properties, as compared to the same mixture without mineral filler. The strength activity index of the concrete mixture containing AMF materials must be at least 75% of the control mixture at an age of 28 days. There are certain applications which may either promote or limit the use of AMF materi-

als. These fine mineral fillers have enhanced the performance of pumped concrete,

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Aggregate Fillers Continued from Page 4... improved the robustness of self-consolidating concrete mixtures, and have been successful in moderating the setting characteristics of high volume fly ash mixtures. However, these mate-rials are not recommended when the concrete will be exposed to sulfates, unless an alternative mitigation strategy is employed. Some state DOT specifi-cations require special approval before using blended or manufactured sands in certain applications. If a concrete producer intends to use a blended sand, some state DoTs require the ma-

terial to be blended as-received, rather than allowing the blending to be performed at the ready mix plant. The benefits of using GCC or DOF mineral filler materials in concrete mixtures are most readily realized by the concrete producers who are also quarry operators furnishing their own coarse and fine aggregates. Maximizing the underutilized quarry byproducts in con-crete mixtures can provide long-term benefits to the operating economics as well as con-crete performance.

This article was prepared by Tim Kaiser, Technical Services Manager for Cemex. The KRMCA published Part 1 in the June KRMCA Newsletter. For a full article copy, please

contact the KRMCA Office.

1 ACI 211.XR - Standard

Practice for Selecting Pro-portions for Normal, Heav-yweight, and Mass Con-crete, American Concrete Institute, Farmington Hills, MI. 2 ASTM International, West

Conshohocken, PA 3 Multi-Scale Investigation

of the Performance of

Limestone in Concrete,

Bentz et al, Construction

and Building Materials, 75 (2015), http://dx.doi.org/10.1016/j.conbuildmat.2014.10.042

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2016 KRMCA Golf Outing Frankfort Country Club

Frankfort, KY On Monday, June 20th, the KRMCA held its 30th Annual Golf Outing at Frankfort Country Club in Frankfort, KY. The event was a huge success! Thanks to everyone that attended, and a special thanks to the Gold Club Spon-sors that were also Golf Outing Hole Sponsors. If you see one of the following sponsors out and about, please thank them! KRMCA Golf Outing Hole Sponsors were: All-Rite Ready Mix Baker Concrete Construction Buzzi Unicem Cemex/Kosmos Cement Charah, Inc. Ernst Concrete Kentucky Essroc Cement Corp. Flyash Direct GCP Applied Technologies Hilltop Companies imi—Irving Materials, Inc. LafargeHolcim Lehigh Cement Company Liter’s Inc. Logan Lavelle Hunt Nugent Sand Company RussTech Admixtures, Inc. Stalite Stephens Manufacturing Co. Viking Truck/Oshkosh/McNeilus The event started out with registration and lunch before the shotgun began. At noon, golfing began and lasted until dinner. With dinner being served, the awards were also handed out. Congratulations to the following 2016 KRMCA Golf Outing Winners: A Flight: 1st Place– Mayo, Greer, Greer, Greer 2nd Place– Condo, Condo, Barnhart, Papinia 3rd Place– McGrady, Hannold, Byers, Blair 4th Place– Church, Davenport, Neskols, Underwood, Moe B Flight: 1st Place– Morrison, Mabbitt, Vittitow, Turner 2nd Place– Neumeister, Jones, Spalding, Applebaum 3rd Place– Wimsatt, Layman, Harrison, Bryant 4th Place– McMillan, Wells, Cole, Cole C Flight: 1st Place– Webster, Johnson, Stewart, King 2nd Place– Messick, Smith, Williams, Storm 3rd Place– Deters, Suter, Nofziger, Korfhage 4th Place– Howard, Owens, Irvine, Duba D Flight: 1st Place– Hornback, Liter, Liter, Murphy 2nd Place– Ray, Newell, Newell, Couch 3rd Place– Russell, Robertson, Heller, Good 4th Place– Wells, Steffen, Turner, Moore Closest to the Hole: Alex Greer- #2 Clay McMillan- #8 Blair Jones- #10 Brett King- #17 Longest Drive: Haydon Kolfage- #5 Longest Putt: Eddie Webster- #18

Congratulations to all the winners, and thanks to the Hole Sponsors! Turn to pages 16 & 17 to see some pictures from this year’s outing...

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Rate Increases are in Effect for ACI Level I Classes Beginning with the July 26th ACI Level I Class, there will be an increase in the cost for the certification. At the Winter Board Meeting, the Board voted to increase the fees for the class to make up for increase in expenses for the class over the last five-seven years. As you will notice in this newsletter, there are two ACI Level I registration forms– one for the May and June classes, and one for the July, August and September classes. This is to re-flect the changes in the fees. The May ACI Level I class is currently filled, with some avail-ability still in the June class– seats will be filled on a first come, first serve basis, with KRM-CA members receiving priority. The new registration form has “New class rates effective July 1, 2016” in the top left corner of the form. Another change that will be occurring come July is additional fees that can be accrued dur-ing the ACI Level I class. Beginning with the July class, if you cancel within a week of the class, there will be a $100 charge, plus any cancellations will be charged the cost of the ACI Manual (or it can be returned). If you cancel over a week out, there won’t be a can-cellation fee, just the charge for the manual, unless it is returned. Another change is that if you change classes from one month to the next– you will be permitted one move, but if you move again, there will be a $100 charge, and each time after that, there will be addi-tional $100 charges. Please make sure you can attend the class for which you register. Should you have any questions, please contact the KRMCA Office. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

KRMCA 2016 Membership Directory

By now, KRMCA members should have received their directory listing form and directory ad form in the mail. Please make sure that you make any changes neces-sary, provide a company point-of-contact email, and send it back to the KRMCA Office, even if there aren’t any changes to your listing. Included in the mailing was the Directory advertise-ment form. If you would like to advertise in the KRMCA Directory, please fill this form out and send it in to the KRMCA Office. There is plenty of time to make a deci-sion of whether or not to advertise. Should you have any questions about advertising, please contact the KRMCA Office. If you have any questions regarding company listings or advertising, please contact the KRMCA.

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RMC Foundation Releases Driver Recruitment and Onboarding Resources

The Ready Mixed Concrete (RMC) Research & Education Foundation is proud to announce the release of several new driver recruitment and onboarding resources. These new tools, which include nine-minute and two-minute recruitment videos and 30-second and 60-second radio spots, will help ready mixed concrete producers introduce the industry to new potential drivers and recruit them for their own companies. The vide-os can also serve as interview and onboarding resources to give driver candidates and new-hires an in-depth look at "A Day in the Life" of a professional mixer truck driver.

"At a time when con-crete producers are at their busiest while also competing with other industries for new driv-ers, it is essential that our industry has access to easily-implemented resources that will in-crease outreach and draw new potential pro-fessionals to the indus-try and these new re-sources meet that need," said Foundation Chairman Matt Wood of Ash Grove Cement Company, adding "These resources help to highlight the posi-tives of becoming a professional mixer driv-er, such as being home-based and helping to build their community,

benefits which will also help bring new blood to the concrete industry." Foundation Executive Director Julie Garbini noted that "The development and release of these new driver recruitment resources is very timely when the need for additional drivers is at its peak. We are delighted to be able to provide these important new tools in support of the concrete industry."

These video and audio clips are very large in size. We have made them available for download from the Foundation's website here and they may be viewed from the Foundation's YouTube page here. They will also be available on the Foundation's special edition USB key containing most of the Foundation's delivera-bles to-date. Additional information about this project and others funded by the RMC Research & Education Foundation may be found at www.rmc-foundation.org.

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