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SITE CONCRETE Section 03000 15-1207 shrinkage -compensated, fiber reinforced, cementitious repair mortar for horizontal, vertical and overhead applications as manufactured by W.R. Meadows or accepted equal. V. Non -shrink Grout: Masterflow 713 Plus by Master Builders or approved equal. Premixed, non-metallic, no chlorides, non -staining and non -shrinking per CRD -C621, Corps of Engineers Specification and ASTM C 1107, Grades B and C. W. Aggregate Base: Class 2 AB per Caltrans specification section 26-1.02A. X. Joint sealant for expansion joints: Single component silicone sealant, Type S, ASTM D5893. 1. Reference Standard: ASTM C920, Grade P, Class 25, Use T. 2. Dow Corning 890 -SL (self -leveling) Silicone, or accepted equal. 3. Dow Corning 888 -NS (non -sagging) Silicone, at slopes exceeding 5%. May not be used at asphalt surfaces. 4. Color: Custom color as selected by Architect. Y. Pre- Formed plastic Expansion Joint; W.R. Meadows 3/8" "Snap Cap", Tex -Trude expansion joint cap, or an approved equal. 2.02 CONCRETE DESIGN AND CLASS A. Designed Strength and Classes of Concrete: The following mixes are not applicable to concrete items exceeding 4 feet in height above the adjacent grade. 1. Class "B": Concrete shall have 1" max. size aggregate, shall have 3000 psi min. at 28 day strength with a maximum water to cementitious ratio no greater than 0.50. Use for exterior slabs, including walks, vehicular paved surfaces, manhole bases, poured -in- place drop inlets, curbs, valley gutters, curb & gutter and other concrete of like nature. 2. Class "D" concrete of 1" max. size aggregate shall have 3500 psi 28 day strength with a maximum water to cementitious materials ratio of 0.55. Use for footings and retaining walls not attached to buildings, and planter walls, monument signs, and other site concrete not described for use in Class "B". B. Slump Limits: Provide concrete, at point of final discharge, of proper consistency determined by Test Method ASTM C143 with a slumps of 4" plus or minus 1". C. Mix Design: All concrete used in this work will be designed for strength in accordance with provisions of CBC, Section 1905A.3. Should the Contractor desire to pump concrete, a modified mix design will need to be submitted for review. Fly ash may be used in concrete to improve workability in amounts up to 15% of the total cementitious weight. D. Air Entrainment; Per the Local Jurisdiction minimum requirements, but no less than 3%. 2.03 MIXING OF CONCRETE A. Conform to requirements of CBC, Chapter 19A. B. All concrete shall be mixed until there is uniform distribution of material and mass is uniform and homogenous; mixer must be discharged completely before the mixer is recharged. C. Concrete shall be Ready -mixed Concrete: Mix and deliver in accordance with the 5