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 Last Updated 08/22/2017:  Specification clarification for the use of slag cement.

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GENERAL INFORMATION:

All materials proposed for use in concrete and all concrete mix designs shall be approved by the Eastern Missouri Pavement Consortium (EMPC) 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 EMPC approved mix designs for 2017 will expire on April 1, 2018, even if mixes are used on multi-year construction projects. New mix designs must be submitted to the EMPC administrator to remain an approved EMPC supplier for 2018. Mix designs, meeting specification requirements, submitted via EMPC website, empcpavement.org, received by February 14, 2018 will be approved by the deadline. 

EMPC will preapprove aggregates and cementitious materials. Submit certifications directly to EMPC. If the material is approved by EMPC it will be added to the website as an option.

FEES:

Concrete Mix Designs:

$100 fee per mix design (when received by June 30th)

$120 fee per mix design (when received after June 30th)

$240 fee per mix design requiring approval in less than 10 working days

Note: An additional $120 fee will be assessed for each mix design requiring a second round of comments and $120 for any additional round of comments.

GBA will invoice for all concrete mix design submittals. Please do not submit payment prior to receiving an invoice. Please make checks payable to GBA.

All mix designs shall be submitted through the website using the 2017 Mix Design Submittal Form on empcpavement.org.

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 are good for one year and must follow the 2017 EMPC Concrete Material Specification.

SUBMITTAL REQUIREMENTS:

Concrete mix design submittals shall include:

    • Completed “2017 Mix Design Submittal Form” with attached supporting documentation (strength tests, material certifications and admixture data sheets).
    • Proportion of admixtures (Admixtures for water reduction, set acceleration, set retardation, or viscosity modifiers may be shown as optional. Provide addition rate ranges and specific dosage rates for ALL admixtures in the mix design. ALL optional admixtures shall be submitted in the following format for dosage: zero, anticipated dosage, approved range (0, X (Y-Z) cwt. Admixtures listed as optional shall require approval from the owner prior to use.
    • Admixtures shall be on the Missouri Department of Transportation PAL.
    • Admixture 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, as listed in supplied documentation, a letter from the manufacturer shall be provided. The letter shall specifically state the dosage rate and range approved by MoDOT. Individual members reserve the right to reject mixes with admixtures falling outside the manufacturers recommended dosage rates.
    • Compressive Tests:

Compressive tests shall be on concrete that contains materials, sources, ratios, admixtures, and admixture dosages consistent with the submitted mix design, and the specification, normally accepted within the Saint Louis Metro Area. For currently approved designs, each strength test will have been completed since the most recent approval date (except as noted below). For new mix designs, strength tests will have been completed in the previous 12 months. Compressive tests (strength test) are required for each mix design submitted, however, if mix designs differ only in water to cement ratios, compressive strength test results for the highest water cement ratio will be acceptable in all mix designs of the series. For the purposes of the EMPC approval process, a strength test is defined per ACI-318-11, section 5.6.2.4.Each concrete compression test must be sampled from separate batches.  ACI 318-11 will be referred to as the Code in the remainder of this section. 

Required average compressive strengths shall meet the requirements of section 5.3.1 and 5.3.2 of the Code with the following modifications:

Section 5.3.1

One half of the tests submitted under section 5.3.1 of the Code shall be on compressive tests batched after the previous years’ approved mix design date.

Documentation showing the standard deviation and all other relevant calculations shall be provided.

Section 5.3.2.2

Concrete for compressive tests must be batched after the approval date of the previous years’ submittal. Batch tickets or Laboratory data shall be provided for each compressive test and shall include, plant name, design w/c ratio, design weights per cubic yard, total weight of all materials batched, time batched, design slump, moisture correction for aggregates, and dosages of all admixtures.  Batch tickets or laboratory data shall be easily correlated with strength test results.

Provide documentation for each batch 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, submitted for annual approval, on concrete with water/cement ratios below design are not acceptable. Batch tickets or laboratory data showing unapproved additions to the concrete will not be accepted.

Actual batched concrete for compressive tests shall include all of the design water, cement, and all non-optional admixtures

Compressive tests taken before 28 days are acceptable if they meet all other requirements.

Mixes without Historical Data

If the mix design is new and historical data is not available the trial batch method outlined in section 5.3.3.2 or 5.3.2 of the Code shall be used. The curve described in section 5.3.3.2 shall be provided with the data.  

Test results performed by a qualified laboratory for a minimum of three concrete compression tests that meet requirements of chapter 5 of ACI 318-11 for strength are required.

Aggregates and Cementitious Material Submittals shall include (Online Form and Attached PDF Format):

    • Contact information
    • Source of material
      • Aggregate and cementitious material submittals shall include all pertinent information regarding the specification and will be submitted to the EMPC administrator. All submittals shall include a statement, from the testing agency, stating the material meets the requirements of the EMPC specification and any current, prevailing referenced specifications.
    • Test results, performed by a qualified laboratory, that meet the current EMPC Specification for aggregates.
    • Test results, performed by a qualified laboratory, that meet the current EMPC Specification for Cement.
    • Test results, performed by a qualified laboratory, that meet the current EMPC Specification for Secondary Cementitious Materials.

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. Expansion shall be a maximum of 0.10% at 16 days.

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

Please send all submittal information through the website. Contact the EMPC administrator with questions.

Kim Streicher

George Butler Associates, Inc.

kstreicher@gbateam.com

Tel. 636-385-5638