TACA HIGH STRENGTH CONCRETE CONTEST

A contest of technology, experience, and a little luck.

HIGH STRENGTH CONCRETE COMPETITION. This is a compressive strength concrete competition sponsored by the Specification Committee of TACA. The purpose will be to showcase the material innovations and techniques that are available in the Texas marketplace. All participants will be requested, but not required to submit the mix design, as well as a detailed description of any special procedures for mixing, material addition, etc. All participants will have access to any submitted mix designs after the competition in a full report detailing results and mix designs. This is not about ordinary concrete. This is high strength concrete. Cost is not an issue. In similarly sponsored competitions around the country, it is not uncommon to see a 28-day compressive strength in excess of 20,000 psi. The following rules and guidelines will apply. Good luck.

  1. Participation is open to all allied and producer members of TACA, as well as Universities.
  2. There will be two categories in the competition, Plant Mix and Lab-Crete. Participants are welcome to participate in one or both categories.
  3. The Plant Mix contest will be based on the highest 28-day average compressive strength generated from three 4” x 8” cylinders. However, each participant will be required to submit four 4” x 8”cylinders.
  4. The Lab-Crete contest will be based on the highest 56-day average compressive strength generated from three 4” x 8” cylinders. Each participant will be required to submit four 4” x 8” cylinders.
  5. The four cylinders will all be cast on the same day from the same batch design, no earlier than March 31, 2017. The attached Cylinder Verification should be signed by an officer of the company attesting to the date the cylinders were cast.
  6. All materials used in the Plant Mix concrete mixtures must be commercially available to the public at large within the State of Texas.
    1. Material certification must accompany each entry. This includes mill certifications and aggregate gradations, and any other materials requirements generally used for a mix design submission.
    2. Technical data sheets for each chemical admixture or additional supplementary pozzolanic materials must also accompany each entry.
  7. There are no limitations in the Lab-Crete contest regarding availability of materials within the state of Texas. Material certifications and technical data sheets may accompany each entry as described in the Plant Mix rule 6.1 and 6.2. If hazardous materials are used in the mix (steel fibers, caustic substances, etc.) appropriate notification and instructions must accompany the cylinders. In the interest of information sharing friendly competition TACA recommends and requests the technical data for mix constituents, but allows participants the choice in divulging proprietary information.
  8. Mix designs can be cast no earlier than March 31, 2017. A verification letter (see attached form) signed by a senior company official will be included with the submittal form.
  9. There is no limitation on cement content, admixture dosage, pozzolanic replacement, minimum or maximum slumps, water content, etc.
  10. All preliminary mix design batching, casting, and curing activities, must take place on the submitting member’s property, i.e. no mixing and casting at the plant or lab, and then sending off to some specialty lab for curing, or vice-versa.
    1. Final mixing and batching of concrete for the cylinders in Plant Mix competition must occur in a standard 10 yd3 truck or a volumetric mixer truck. A central mix batch plant may be utilized, but the concrete must be discharged from a ready mix concrete truck.
    2. There are no restrictions as to how the concrete is to be mixed for the Lab-Crete competition.
  11. Submitting member/ student is required to grind and/or cap their cylinders in preparation for strength testing. Do not deliver cylinders with pad caps. It is the participant’s choice on how to prepare the ends. However, the cylinders will be tested in the condition they are received. If the cylinders are received uncapped they will be tested uncapped. TxDOT and TACA will not be responsible for cylinder end preparation prior to testing. Lab personnel will determine viability of specimen for testing.
  12. Only one submission for each category (four 4” x 8” cylinders) per TACA member/ student. The best three out of four strength tests will be used to calculate the winners for the 28-day and/ or 56-day strength result for the competition.
  13. Each submission should include a Cylinder Verification Sheet, a mill Certification for each cementitious material used (including all pozzolans), a gradation sheet for each aggregate used (including specific gravity, unit weight, and absorption), and technical data sheets for each chemical admixture used.  These items may be uploaded below and submitted when you complete the entry form.
  14. Rule clarification questions should be submitted in writing via e-mail to Chair of the Specification Committee Kevin Copeland, Wiss, Janney, Elstner Associates, Inc. at kcopeland@wje.com.
  15. Winners will be announced at the TACA Annual Meeting on June 16, 2017, and receive trophies and bragging rights.
  16. Cost for participation is $100. Fee waived for students.
  17. Testing of the cylinders will be done by TxDOT. Do not leave paperwork with TxDOT. All paperwork is to be submitted to TACA. The testing lab will not have the names of the companies submitting the cylinders, only an entry number. Once you complete the form below and click submit, your entry number will be shown on the email confirmation of your application.  Please label all your cylinders with the entry number.
  18. Cylinder drop off is due no later than end of business on April 21, 2017 for Plant Mix cylinders and Lab-Crete Cylinders. Any cylinders that arrive later than 4:00PM on the specified date will NOT be allowed to participate in the contest. Testing of the cylinders will be accomplished on April 27, 2017 for Plant Mix cylinders and May 25, 2017 for Lab-Crete cylinders.
  19. Cylinder drop off location is Attn: Rachel Cano, TxDOT Cedar Park Campus, Building 51 (9500 N. Lake Creek Parkway, Austin, TX 78717; Email: Rachel.Cano@txdot.gov; Phone: 512-506-5921)

Cylinder Verfication

I do hereby certify that the cylinders used in the 2017 TACA High Strength Concrete competition were cast on the following date
and will not be greater than 28 days in age at the time of testing.
COMPANY
TECHNICAL REPRESENTATIVE
COMPANY OFFICER OR SENIOR OFFICIAL
Each submission should include a Cylinder Verification Sheet, a mill Certification for each cementitious material used (including all pozzolans), a gradation sheet for each aggregate used (including specific gravity, unit weight, and absorption), and technical data sheets for each chemical admixture used.
If you have them prepared, you can attach these documents below as either a single combined PDF, separate PDF files or a zip file of your PDF documents.
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