796 707.14.3 -Certification of Water -Reducing and Accelerating Admixtures: When a Contractor proposes to use an approved water -reducing and accelerating admixture, the procedure set forth in 707.2.4 shall apply.
707.14.4 Additional Test Requirements for Water -Reducing and Accelerating
Admixtures (Optional): Either prior to or at any time during construction, the Engineer may require the selected admixture to be tested further to determine its effect on the streng th of the concrete. When so tested, the water -reducing accelerator shall meet the requirements specified in 707.14.2.
707.15 Hydration Control Stabilizing Admixtures for Concrete :
707.15.1 Acceptance Requirements for Approval of Hydration Control Stabilizing
Admixtures: Water -reducing and accelerating admixtures for concrete shall be tested by NTPEP (National Trans portation Product Evaluation Program). The NTPEP testing results shall meet the requirements of AASHTO M 194, Type B or D .
707.15.2 Performance Requirements for Concrete Hydration Control Stabilizing
Admixtures:
707.15.2 1 -The effects of using hydrat ion control stabilizing admixtures may vary
widely with different types of cement, cement from different mills, aggregate proportions, aggregates from different sources and of different gradation, and changes in water -cement ratio. Therefore, no hydration control stabilizing admixture shall be used until the concrete of the specified class, designed in accordance with these Specifications and made with the ingredients proposed for use by the Contractor, including hydration control stabilizing admixtures as specified or permitted under this Specification, is shown to meet the requirements of AASHTO M 194 for water reduction and compressive strength increases at ages 3, 7, and 28 days.
707.15.2 2 -In order for a concrete mix design, containing a hydration control stabilizing
admixture, to be considered for the allowable concrete discharge time extension for excessive haul time, as outlined in Section 601.7, the additional following extended discharg e time testing is required in that subject mix design. Upon completion of the mixing of at least one of the trial batches at the minimum cement factor, for the subject mix design, as required in MP 711.03.23, air content and slump tests in accordance wi th Section 601.4.1 shall be performed on that trial batch of plastic concrete. A test to establish the initial and final times of setting of the concrete mix shall also be performed, in accordance with ASTM C403. The air content and slump tests shall the n be repeated at 45 -minute intervals, until a period of 3 -hours after the completion of mixing has elapsed. The value obtained by any of the air content tests during the 3 -hour period shall not vary, from the value obtained by the initial air content tes t, by more than 2.5 percentage points. The value obtained by any of the slump tests during the 3 -hour period shall not vary, from the value obtained by the initial slump test, by more than 1.75 inches. The results of all these tests shall be included, al ong with all the other information required in MP 711.03.23, when the subject mix design is submitted for approval. When more than one mix design, for the same Producer/Supplier, is submitted for approval on the same day, only one set of extended discharg e time tests, as outlined in 797 paragraphs two through five of this sub -section, will be required for that entire group of mix designs. That one set of extended discharge time tests, for the subject group of mix designs, shall be performed on the mix design, in that group of mix designs, which has the highest cementitious material content. If the results of that set of extended discharge time tests meet the requirements of this sub -section, then all of the mix designs, in that group of mix designs submitted on that same day for that Producer/Supplier, shall be approved for use with the extended discharge time.
707.15.2 3 -The subject concrete mix design, and the concrete mix used during
construction, shall contain the quantity of admixture recommended by the manufacturer at the prevailing temperature.
707.15.3 Certification of Hydration Control Stabilizing Admixtures: When a
Contractor proposes to use an approved hydration control stabilizing admixture, the procedure set forth in 707.2.4 shall apply.
707.15.4 Additional Test Requirements for Hydration Control Stabilizing
Admixtures (Optional): Either prior to or at any ti me during construction, the Engineer may require the selected admixture to be tested further to determine its effect on the strength of the concrete. When so tested, the hydration control stabilizing admixture shall meet the requirements specified in subsection 707.15.2.
707.16 Concrete Protective Coating Materials :
707.16.1 Acceptance: For initial approval, the manufacturer shall submit representative
samples, colors chip(s) and certified laboratory test data along with the Material Data Sheets on the batch of material that is going to be used on WVDOH’s projects to the Division of Materials for review, approval and placing on the Department’s List of Approved Materials. In addition, the Materials Division may require that a representative from the manufacturer of the product be present at the project site during the application of the concrete protective coating to provide guidance on the mixing (if any), application of the product, and surface preparation. If the initially accepted product has not been used on a WVDOH’s project for a period of two consecutive years, the product shal l be removed from the Department’s List of Approved Materials. Any re -approval of a removed product shall comply with Subsection 707.16.1 Subsequent approval of an initially accepted product shall be based on the manufacturer’s submittal of a certificat ion to the Materials Division on each batch of the product that is going to be used on WVDOH’s projects. Such a certification shall be stating that the said product passes the laboratory test requirements listed in this subsection. Tests listed herein ar e the minimum testing requirements to be met. When requested in writing, the Engineer may accept materials based on conformance to the same type of test but differing on minor procedural points. Attach copies of test procedures which differ from those st ated herein. In addition to the material, provide brochures or booklets containing detailed instructions and explanatory remarks about surface preparation, application procedures, and operations.
A.Freeze -Thaw Test . Cast and cure three concrete specimens no less than 4 by 6 by 6 inches. Moist cure specimens for 14 days and then dry in room air at 60° to 80°F for three (3) hours and remove. 1.) Immerse in water at room temperature 60° to 80°F for three (3) hours and remove. 2.) Place in cold storage at 5°F for one (1) hour and remove. 798 3.) Thaw at room temperature 60° to 80°F for one (1) hour. 4.) Repeat steps 1, 2, and 3 to complete a total of 50 cycles. At the end of 50 cycles of the Freeze/Thaw Test, ensure that the coated specimens show no visible defects.
B.Accelerated Weathering. Test according to ASTM G153. Apply at an application rate of 50± 10 ft 2/gal. Test for 5,000 hours in an Enclosed Carbon Arc Weatherometer. Perform the test in 120 minutes cycles consisting of 102 minutes of light and 18 minutes of light and demineralized water. At the end of the exposure test, ensure that there are no checking, cracking, or loss of film integrity, and no oth er firm defects. The color difference after 5,000 hours shall be no more than five ΔE units.
C.Salt Spray Resistance. Apply the masonry coating to concrete at a rate of 50± 10 ft2/gal, and test the coating according to ASTM B117. Expose the coating to a f ive percent (5%) sodium coating chloride (salt) solution for 300 hours, and maintain it at 95°F during the period of exposure. Ensure that it shows no loss of adhesion or deterioration at the end of the 300 hours.
D.Fungus Growth Resistance . Ensure that th e protective coatings pass a fungus resistance test as described by the ASTM D3273. At the end of four weeks exposure there shall be no growth on the coatings.
707.17 Specific Performance Admixtures for Concrete :
707.17.1 Acceptance Requirements for Approval of Specific Performance
Admixtures: Specific performance admixtures for concrete shall be tested by NTPEP (National Transportation Product Evaluation Program). The NTPEP testing results shall meet the requirements of AASHTO M 194, Type S.
707.17.2 Performance Requirements for Concrete Accelerators:
707.17.2 1 -The effects of using specific performance admixtures may vary widely with
different types of cement, cement from different mills, aggregate proportions, aggregates from different sources and of different gradation, and changes in water -cement ratio. Therefore, no specific performance admixture shall be used unt il the concrete of the specified class, designed in accordance with these Specifications and made with the ingredients proposed for use by the Contractor, including Type S admixtures as specified or permitted under this Specification, is shown to meet the requirements of AASHTO M 194 for compressive strength at ages 3, 7, and 28 days.
707.17.2 2 -The mix shall contain the quantity of admixture recommended by the
manufacturer at the prevailing temperature.
707.17.3 Certification of Specific Performance Admixtures: When a Contractor
proposes to use an approved specific performance admixture, the procedure set forth in subsection 707.2.4 shall apply.
707.17.4 Additional Test Requirements for Accelerating Admixtures (Optional):
Either prior to or at any time during construction, the Engineer may require the selected admixture to be tested further to determine its effect on the strength of the concrete. When so tested, the accelerator shall meet the requirements specified in subsection 707.17.2.
Source: West Virginia Standard Specifications for Road and Bridge Construction, 2023 Edition. Pages 818–820 of 1,006.