794 707.6 -POLYETHYLENE COATED BURLAP FOR CURING CONCRETE : This material shall consist of burlap impregnated on one side with white opaque plastic film. The plastic film shall be securely bonded to the burlap. The film shall be clean and free o f imperfections. Acceptance will be based on visual inspection. 707.7 -BURLAP CLOTH MADE FROM JUTE OR KENAF FOR CURING CONCRETE : The burlap cover shall be clean and free of defects. The cover shall provide a water retention blanket over the concrete. Acceptance will be based on visual inspection. 707.8 -WATERPROOF PAPER FOR CURING CONCRETE : Waterproof paper shall consist of two sheets of kraft paper cemented together with bituminous material and reinforced with fiber. The top surface shall be white. Acceptance will be based on visual inspection. 707.9 -LIQUID MEMBRANE -FORMING COMPOUNDS FOR CURING CONCRETE : Curing compounds shall conform to the requirements of ASTM C309, Type 2, Class A. All curing compound must be tested by NTPEP and shown to meet the specification listed in the paragraph above.
707.10 White Polyethylene Sheeting (Film) for Curing Concrete :
The sheeting shall be opaque white plastic film. The film shall be clean and free of imperfections. Acceptance will be based on visual inspection.
707.11 Epoxy Resin Pr Otective Coating :
The material shall conform to the requirements of ASTM C881, Type III, Grades 1 or 2, Class B or C. Pigmentation shall be required in the sy stem so the cured coating shall conform to Federal Color Standard 595, No. 16357.
707.12 Concrete Sealer :
707.12.1 General: The material shall be a one component, water repellant penetrating
sealer, meeting the criteria listed in section 707.12.2. The material shall be capable of meeting the criteria with a single coat and shall not alter the color of the treated surfaces.
707.12.2 Acceptance: The Contractor shall furnish certified laboratory test data showing
the material meets the following performance requirements:
1.Absorption -ASTM C64 2 (non -air entrained concrete). Concrete should be proportioned and mixed in accordance with AST M C672. Sealed concrete, under total immersion, will not exceed 1.0% absorption after 48 hours or 2.0% absorption after 50 days.
2.Scaling Resistance -ASTM C672. A rating of "No Scaling" after 100 cycles on the sealed concrete (non -air entrained concrete) a s compared to "Severe Scaling" on untreated concrete.
3.NCHRP 244, Series II -Cube Test 3.1 Weight Gain -not to exceed 25% of untreated cube. 3.2 Absorbed Chloride -not to exceed 25% of untreated cube.
4.NCHRP 244, Series IV -Southern Exposure 4.1 Absorbed Chloride -not to exceed 10% of untreated concrete. 795 707.13 -ACCELERATING ADMIXTURES FOR CONCRETE :
707.13.1 Acceptance Requirements for Approval of Accelerators: Accelerating
admixtures for concrete shall be non -chloride and shall be tested by NTPEP (National Transportation Product Evaluation Program). The NTPEP testing results shall meet the requireme nts of AASHTO M 194, Type C.
707.13.2 Performance Requirements for Concrete Accelerators:
707.13.2 1 -The effects of using accelerating admixtures may vary widely with different
types of cement, cement from different mills, aggregate proportions, aggr egates from different sources and of different gradation, and changes in water -cement ratio. Therefore, no accelerator 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 Type C 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.
707.13.2 2 -The mix shall contain the quantity of admixture recommended by the
manufacturer at the prevailing temperature.
707.13.3 Certification of Accelerating Admixtures: When a Contractor proposes to use
an approved accelerating admixture, the procedure set forth in subsection 707.2.4 shall apply.
707.13.4 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 707.13.2.
707.14 Water -Reducing and Accelerating Admixtures for Concrete :
707.14.1 Acceptance Requirements for Approval of Water -Reducing and
Accelerating Admixtures: Water -reducing and accelerating admixtures for concrete shall be tested by NTPEP (National T ransportation Product Evaluation Program). The NTPEP testing results shall meet the requirements of AASHTO M 194, Type E.
707.14.2 Performance Requirements for Concrete Water -Reducing and Accelerating
Admixtures:
707.14.2 1 -The effects of using water -reducing and accelerating 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 water -reducing accelerator 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 Type E admixtures as specified or permitted under thi s 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.
707.14.2 2 -The mix shall contain the quantity of admixture recommended by the
manufacturer at the prevail ing temperature.
Source: West Virginia Standard Specifications for Road and Bridge Construction, 2023 Edition. Pages 816–817 of 1,006.