704.1 704.1(b)
704.1GENERAL —
Cement concrete is a mixture of Portland cement, fine aggregate, coarse aggregate, water , and air -entraining admixture, with or without water reducing admixture, retarding admixture, or supplementary cementitious material (SCM ). The methods of producing concrete referred to in these Specifications are defined as follows:
and central plant or a stationary plant located near the project. Concrete is delivered to the work site by truck, agitator truck, or mixer truck.
placing the dry ingredients in a truck mixer. Measured water is then added to the truck drum from the plant water system and the concrete is mixed in the truck at the plant. Mixing is not allowed enroute to or at the work site.
mixer. The unit is capable of proportioning concrete ingredients from self -contained bins and mixing the materials with measured water in a self -contained mixer. The concrete is mixed and discharged at the work site.
• Cement . Section 701
• Fine Aggregate, Type A . Section 703.1
• Coarse Aggregate, Type A, maximum size AASHTO No. 467, No. 57, No. 67, or No. 8 (Stone, Gravel, or Slag) . Section 703.2
• Coarse Aggregate, Type A Lightweight . Section 703.2(a)6
• Coarse Aggregate, Type A, for AA Slip Form Paving, AA Form Paving, AA Accelerated Paving, and HES Paving. Section 703.2, except as follows: AASHTO No. 467, No. 57, No. 67, or No. 8. Do not exceed 3.0% absorption for gravels and 2.0% absorption for all other aggregates. Coarse aggregates with higher absorption may be allowed provided mix design specimens meet 300 freeze- thaw cycles according t o ASTM C666 with less than 0.04% dilation and/or durability factor greater than 80.
• Water . Section 720.1
• Admixtures . Section 711.3
• Supplementary Cementitious Material (SCM) . Section 724
Cement Concrete Criteria Class of Concrete Use Cement Factor(2)(4)(10) (lbs./cu. yd.) Water Cement Ratio(5) (lbs./lbs.) Minimum Mix(1,7) Design Compressive Strength (psi) 28-Day Structural Design Compressive Strength (psi) Days Min. Max. Min. Max. 3 7 28(8) 56(8) AAAP Bridge Deck 560 640 0.45 — 3,000 4,000 — 4,000 AAA(3) Other 634 752 0.43 — 3,600 4,500 — 4,000 AAAP LW Bridge Deck 600 730 0.45 --- 3,000 4,000 --- 4,000 AA Slip Form Paving 517 611 0.37 0.42 — 3,000 4,000 — 3,500 AA Form Paving