GENERAL INFORMATION:

All materials proposed for use in concrete and all concrete mix designs shall be approved by the Kansas City Metro Materials Board (KCMMB) prior to use. Such materials include coarse and fine aggregates, cementitious materials, admixtures and water. All materials shall be SAMPLED and TESTED after October 1st of the previous year.

ALL KCMMB approved mix designs for 2011 will expire on April 1, 2012, even if mixes are used on multi-year constructions projects. New mix designs must be submitted to GBA to remain an approved KCMMB supplier for 2012. Mix designs, meeting specification requirements, submitted with a completed checklist in PDF format by February 14, 2012 will be approved by the deadline. Mix designs must be submitted by February 1, 2012 with a completed checklist if GBA is to create the PDF.

The 2012 submittal process will be similar to last year. A $50 fee per mix design will be assessed if the mix designs are received by February 14th. Mix designs received after February 14th will be assessed a $100 fee.  Any mix design requiring approval in less than 10 working days will be assessed a $200 review fee. An additional $100 fee will be assessed for each mix design requiring a second round of comments and $100 for any additional round of comments. Please make checks payable to GBA. All mix designs must be submitted in *.pdf format. Submittals not in *.pdf format will be charged an additional submittal fee of $100 per mix design for GBA to create these files. A *.pdf file can be created using Adobe Software, FedEX Office, American Reprographics, or at CPG for their members. GBA has created an example *.pdf file to follow with a list of instructions . The example file can be located by clicking  KCMMB-sample-mix-design.pdf . Strength tests will be the first item reviewed in any submittal. Mix designs with incomplete or incorrect strength tests will be returned without further review of the mix design. This will count as the first round of comments.

All mix designs shall include the standard Mix_Design_Sheet.xls . PLEASE INCLUDE MIX DESIGN SHEET IN THE MIX DESIGN .PDF AND AS A SEPARATE EXCEL FILE.

All mix designs are good for one year and must follow the NEW 2012 KCMMB Concrete Material Specification.
If multiple mix designs are anticipated, the KCMMB requires testing only on the range of cementitious materials. For example: A submittal for 15%, 20%, and 25% slag requires C1567 testing for the 15% submittal only, and the testing must meet a maximum expansion of 0.10%.

SUBMITTAL ORDER:

• Mix Design Sheet
• Strength Tests
• Cement Certification 
• SCM Certification
• Coarse Aggregate Data
• Fine Aggregate Data
• Admixtures

SUBMITTAL REQUIREMENTS:

Concrete mix design submittals shall include:

• Completed Mix_Design_Sheet.xls . The mix design sheet shall be submitted as part of the PDF AND as an Excel sheet. 
• KCMMB-checklist.xls . If multiple mix designs are submitted using the same materials only one checklist is required. The checklist need not be included in the pdf but should be submitted separately.
• Mix designation (Including 4K, 5K, or HE in the designation).
• Contact information.
• Design slump and allowable range after additions of all admixtures.
• Proportions / weights of all mix materials. 
• Source of all mix materials.
• Design water to cement ratio. Mix designs shall be submitted for each combination of materials, differing material proportions or differing water to cement ratios. 
• Design unit weight at the 6.5% design air content. 
• Proportion of admixtures (Admixtures for water reduction, set acceleration, set retardation, or viscosity modifiers may be shown as optional provided they are Kansas Department of Transportation approved and the mix design shows the allowable application rates or dosages for each optional admixture.) Provide addition rate ranges and specific dosage rates for ALL admixtures in the mix design.
• Admixtures submittals shall include documentation from the manufacturer which provides addition rates. If addition rates for admixtures do not fall within the manufacturers recommended dosage rate a letter from the manufacturer shall be provided. The letter shall specifically state the dosage rate and that the admixture meets the requirements for the KDOT approved type. Individual members reserve the right to reject mixes with admixtures exceeding the manufacturers recommended dosage rates.
• Gradation designation for the coarse aggregate. 
• Test results, performed by a qualified laboratory, that meet current KCMMB coarse aggregate specifications. 
• Test results, performed by a qualified laboratory, for coarse and fine aggregate gradations. 
• Test results, performed by a qualified laboratory, that meet current KCMMB specifications listed above for fine aggregate. Consider sand sources the same, provided they are not more than 25 miles apart on the same river and no tributaries enter the river between the 2 points.
• An ASTM C595 certification from the cement supplier, if using a pre-manufactured Type IP (IP) or (IS) cement. The ready mix supplier shall provide an ASTM C150 certification, ASTM C989 certification (slag) or ASTM C618 certification (fly ash), and testing results for ASTM C 1567 Mortar Bar Expansion if required.  Expansion shall be a maximum of 0.10% at 16 days.
• Compressive Tests:

Compressive tests are required for each mix design submitted. Test results performed by a qualified laboratory for a minimum of three concrete compression tests that meet requirements of chapter 5 of ACI 318 for strength are required. However, if mix designs differ only in water to cement ratios, one set of three compressive tests shall be required for only the highest water to cement ratio.  Each concrete compression test must be sampled from separate batches (Note: One compressive test equals the average strength of two 6-inch, or three 4-inch, diameter cylinders made from the same sample of concrete and tested at 28 days). Compressive test taken before 28 days are acceptable if they meet all requirements.

If the 2012 mix design submittal is the same as the previously approved 2011 mix design, compressive test results completed in 2011 (historical data) on that mix design will be acceptable for the 2012 submittal. Test results for approval of the 2011 mix design are not acceptable. For example, tests were performed in January for the 2011 submittal, those tests could NOT be used for the 2012 submittal.

Mixes without Historical Data
If the mix design is new and historical data is not available the trial batch method outlined in ACI 318 (5.3.3.2) shall be used. The curve described in this section shall be provided with the data.  

Supporting Data
In addition to strength tests, batch tickets or laboratory data shall be provided showing all materials used for each strength test. Batch tickets or laboratory data shall be easily correlated with strength test results. Information on the tickets shall include the plant name, design w/c ratio, batch weights per cubic yard, total batched weight of all materials for quantity delivered, time batched, design slump, allowable slump range, moisture correction for aggregates, and dosages of all approved admixtures. Additionally, a spreadsheet shall be submitted showing the water/cement ratio calculations, for each batch ticket, showing how the water/cement ratio was calculated (for example, portland cement, water added at the plant, free water on aggregate, water added on site). Include any other supporting documents. Strength tests with water/cement ratios below design are not acceptable. Batch tickets or laboratory data showing unapproved additions to the concrete will not be accepted.

High Early Concrete (Maturity):

      In addition to the mix design, a Maturity Curve shall be submitted for any high early strength concrete mixes. The curve will be posted on the KCMMB web site (Private Side).  The curve shall be developed in accordance with ASTM C1074: “Practice for Estimating Concrete Strength by the Maturity Method”.  The submittal for the Maturity Curve shall include the following:

• Test results from all tests required by ASTM C 1074
• Table of times, cylinder breaks at the times stated, temperature of the concrete at the times stated, and the Time Temperature Factor for the times stated.
• A graph showing the Compressive Strength of the concrete in psi on the vertical axis and the log of the Time Temperature Factor on the horizontal axis, with the data plotted on the graph and a best fit line drawn through the data points.

Mix designs shall be approved for the KCMMB year, April 1st through March 31st.

Please send all submittal information to:

Josh Miller
George Butler Associates, Inc.
One Renner Ridge
9801 Renner Blvd.
Lenexa, KS 66219-9745
Tel. 913.577.8254
Fax. 913.577.8380