WYDOT 472.0 (Rev. 01-15)

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CONTRACTOR CONCRETE MIX DESIGN PROCEDURE

Scope: This procedure describes required mix design procedures for independent

concrete mix designs and establishes the information which is to be reported with a submitted mix design. This procedure applies to Quality Control / Quality Assurance (QC / QA) projects which require the Contractor to submit concrete mix designs.

Ensure laboratories performing mix designs meet the requirements of WYDOT

Standard Specifications Section 114.2 and 414.4.4. Use: This procedure is to be used for preparation of a mix design by the contractor and

for submission of a contractor’s mix design. Submit information on a WYDOT Form E-45 (see example form in this section) to the WYDOT Materials Program for final approval.

Reference Documents: AASHTO T 22 Standard Method of Test for Compressive Strength of

Cylindrical Concrete Specimens AASHTO T 96 Standard Method of Test for Resistance to Degradation of

Small-Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine

AASHTO T 104 Standard Method of Test for Soundness of Aggregate by Use of Sodium Sulfate or Magnesium Sulfate

ACI 211.1 Portland Cement Association (PCA) “Design and Control of Concrete Mixtures” - Absolute Volume Method

WYDOT 114.2 WYDOT Standard Specifications WYDOT 414 WYDOT Standard Specifications WYDOT 414.4.4 WYDOT Standard Specifications WYDOT 513.4.4 WYDOT Standard Specifications

WYDOT SS-500G WYDOT Supplementary Specification - Structural Concrete with Quality Control and Quality Acceptance

WYDOT 475.0 Correlation of Compressive Strength to Flexural Strength WYDOT 476.0 Allowable Range of Mix Design Strength Results WYDOT 832.0 Deleterious Substances in Portland Cement Concrete WYDOT E-45 Concrete Mix Design WYDOT T-100SE Structural Concrete Pavement Mix Design WYDOT T-100PE Portland Cement Concrete Pavement Mix Design

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Procedure: The concrete mix design shall be conducted according to industry common

practice. A recommended method is the American Concrete Institute (ACI) 211.1 “Absolute Volume Method” as described in the Portland Cement Association (PCA) “Design and Control of Concrete Mixtures”. The mix design process shall include a trial batch. The trial batch may be done in either a laboratory mixer or a field production mixer.

Structural Concrete:

The mix design shall meet the requirements of WYDOT Standard Specifications 513.4.4 and WYDOT Standard Specifications 513.4.4 ”Mix Design” and WYDOT SS-500G ASupplementary Specification for Structural Concrete with Quality Control and Quality Acceptance@, and any additional requirements shown in the contract. The mix design information shall be reported on WYDOT Form T-100SE (see blank form in this section).

The mix design results will include a minimum of three 28 day compressive strength results. The Alaboratory mix design strength@ will be defined as the mean of the 28 day compressive strength results.

Portland Cement Concrete Pavement:

The mix design shall meet the requirements of WYDOT Standard Specifications Section 414 APortland Cement Concrete Pavement@, and any additional requirements shown in the contract. The mix design information shall be reported on WYDOT Form T-100PE (see blank form in this section). The mix design results will include a minimum of three 28 day compressive strength results and three 28 day flexural strength. The Adesign flexural strength@ will be defined as the average of the 28 day flexural strength results, unless modifications are indicated in the contract. The range of the mix design strength values shall meet the limits as specified in WYDOT 476.0.

A compressive strength to flexural strength correlation constant shall be calculated according to WYDOT 475.0 and reported on WYDOT Form T-100PE. This constant shall be used for calculating flexural strength based on field collected compressive strength cylinders.

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General: Suppliers should contact their admixture product sales representative for specific

mix design recommendations. Current WYDOT specifications allow a maximum of 0.45 water-to-cementitious materials (w/cm) ratio. In order to achieve workable mixes, normal range water reducers alone may not perform adequately. Water reducers are listed in WYDOT 111.0 as normal range (NRWR), mid-range (MRWR), and high-range (HRWR).

With the exception of accelerators, on-site admixtures are not required as part of the mix design trial batch. However, the mix design information shall include the information listed following under “AdmixturesA on the appropriate WYDOT Form T-100, T-100PE, or T-100SE.

When stabilizers are to be used in the mix design, the stabilizer shall be incorporated into the trial batch. The stabilizer shall be added as indicated in the batching sequence. The transport time shall be simulated prior to reactivating the stabilizer. The mix design information shall include the information listed as follows under @Stabilizer@ on the appropriate WYDOT Form T-100, T-100PE, or T-100SE.

Include the following:

Class of Concrete and Specified Design Strength

Fine Aggregate Information;

Dry Weight and SSD Weight Aggregate Gradation Fineness Modulus Specific Gravity (SSD) Absorption Sodium Sulphate Loss per AASHTO T 104

Colorimetric (See WYDOT 832.0) Source Location

Coarse Aggregate Information;

Dry Weight and SSD Weight Aggregate Gradation Specific Gravity (SSD) Absorption Sodium Sulphate Loss per AASHTO T 104 Percentage of Wear per AASHTO T 96 Source Location

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Additional Information;

Weight, Type, and Brand of Cement Weight, Class, and Source of Fly Ash Weight, Class, and Source of Other Pozzolans All Admixtures and Dosages (including any special handling or

mixing requirements for admixture introduction) Weight of Net or Mixing Water (total water minus absorbed water) Water/Cement Ratio Water/Cement+Pozzolan ratio Unit Weight, Slump and Air Content Early Strength Results (1, 2, 7 day, etc.), for high early strength

mixes Fracture Type of Cylinders per AASHTO T 22

(See Form T-100SE) A minimum of four 28-day Compressive Strength Results for structural concrete. A minimum of three 28-day Compressive Strength Results and a minimum of three 28-day Flexural Strength Results for Portland Cement Concrete Pavement.

On-Site Admixtures;

Type of admixtures which are anticipated on site Dosage rate (including maximum dosage rate) Mixing requirements

Stabilizers;

Type of stabilizer Dosage rate, not to exceed 4 oz per 100 lb cement Mixing requirements during transport Anticipated slump and air loss (if any) during transport Method of reactivation at the site Initial set time

Units:

Weights: lb Volumes: gal/yd³ respectively Admixture: fluid oz/100 lb of cement or lb/yd³ Strength: psi

A batching sequence shall be submitted with the WYDOT Forms T-100, T-100PE, or T-100SE.

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