711.01 711-1 SECTION 711 CONCRETE CURING MATERIALS AND ADMIXTURES
711.01 Curing Materials . Curing materials shall conform to the following requirements:
Burlap Cloth made from Jute or Kenaf AASHTO M 182 Liquid Membrane -Forming Compounds for Curing Concrete ASTM C309 Sheet Materials for Curing Concrete AASHTO M 171* *Only the performance requirements of AASHTO M171 shall apply. Straw used for curing shall consist of threshed straw of oats, barley, wheat, or rye. Clean field or marsh hay may be substituted for straw when approved by the Engineer . Old dry straw or hay that breaks readily in the spreading process will not be accepted.
711.02 Air-Entraining Admixtures . Air-entraining admixtures shall conform to the
requirements of AASHTO M 154. Admixtures that have been frozen will be rejected per subsections 106.08 and 106.09.
711.03 Chemical Admixtures. Chemical admixtures for concrete shall conform to the
requirements of AASHTO M 194. Admixtures that have been frozen will be rejected. Corrosion inhibiting admixtures shall conform to the requirements of ASTM C1582. Pigments for integrally coloring concrete shall conform to the requirements of ASTM C979. 711.03 711- 2 THIS PAGE INTENTIONALLY LEFT BLANK 712.01 712-1 SECTION 712 MISCELLANEOUS
712.01 Water . Water used in mixing or curing concrete shall be reasonably clean and free of
oil, salt, acid, alkali, sugar, vegetation, or other substance injurious to the finished product. Concrete mixing water shall meet the requirements of ASTM C1602. The Contractor shall perform and submit tests to the Engineer at the frequencies listed in ASTM C1602. Potable water may be used without testing. Where the source of water is relatively shallow, the intake shall be so enclosed as to exclude silt, mud, grass, and other foreign materials.
712.02 Calcium Chloride. Calcium chloride shall conform to the requirements of AASHTO M
144.
712.03 Hydrated Lime . The hydrated lime for hot mix asphalt (HMA) shall conform to the
requirements of AASHTO M 303, Type I. In addition, the particle size requirements shall conform to AASHTO M 303 when tested per CP-L 4209 Physical Testing of Quicklime, Hydrated Lime, and Limestone.
712.04 (unused)
712.05 Precast Concrete Units. Precast concrete manhole base sections, riser sections, and
grade rings shall conform to AASHTO M 199. All other precast units shall be cast in substantial forms. Structural concrete used shall attain a minimum 28 -day compressive strength of 3000 psi as determined per AASHTO T 22. When air -entrained concrete is specified, it shall have an air content of 5 to 8 percent by volume. The precast units shall be cured per AASHTO M 170. Additional reinforcement shall be provided as necessary to provide for handling of the precast units. A sufficient number of cylinders shall be cast, and field cured from each batch, or truck -mixer load, of concrete to permit compression tests at 7, 14, and 28 days, and to allow for at least two cylinders for each test. When the strength requirement is met, the units will be certified for use. Cracks in units, honeycombed or patched areas in excess of 30 square inches, excessive water absorption, or failure to meet strength requirements will be cause for rejection.
712.06 Frames, Grates, Covers, and Steps. Metal units shall conform to the plan dimensions
and to the following specification requirements for the designated materials. Gray iron castings shall conform to the requirements of AASHTO M 306 and AASHTO M 105, Class 35B. Carbon -steel castings shall conform to the requirements of AASHTO M 103, grade 415 -205, Class 2. Ductile iron castings shall conform to the requirements of ASTM A536. Grade shall be optional unless otherwise designated. Structural steel shall conform to the requirements of AASHTO M 270. Malleable iron castings shall conform to the requirements of ASTM A47. Grade shall be optional unless otherwise designated. Steps shall conform to the requirements of AASHTO M 199. Galvanizing, where specified for these units shall conform to the requirements of AASHTO M 111.