however, the chlorideion penetration must meet one of the following:
AASHTO T 277, Table 1, not to exceed 2,800 coulombs; or
AASHTO T 358, Table 1, greater than or equal to 15.6 kΩ-cm for 4- inch by 8- inch cylinders and 12.3 kΩ-cm for 6- inch by 12- inch cylinders.
• Shrinkage (Microstrain) . The 28- day shrinkage according to ASTM C157 is not to exceed 500 microstrain unless approved up to 550 microstrains by the DME/DMM. Wet cure specimens in the lab for 14 days before beginning the 28- day shrinkage testing (42 total days ).
If permeability and shrinkage testing have been met for AAAP with No. 57’s, these tests are not required for AAAP with No. 8’s, provided the aggregates are from the same source.
Design the cement concrete for AA slip form and AA form paving to meet the following requirements:
• Permeability . Design the concrete mixture to meet a target chlorideion penetration of Low, Very Low, or Negligible after a 56- day or less curing period according to AASHTO T 277 or AASHTO T 358; and
• Shrinkage ( Microstrain) . The maximum 28- day shrinkage according to ASTM C157, after 28- day air storage method, does not exceed 0.05%.
• The DME/DMM has the option of accepting mix designs with a chlorideion penetration of Moderate, however, the chlorideion penetration must meet one of the following:
ͦ AASHTO T 277, Table 1, not to exceed 2,800 coulombs; or ͦ AASHTO T 358, Table 1, minimum 15.6 k Ω-cm for 4- inch by 8- inch cylinder and 12.3 k Ω-cm for a 6-inch by 12- inch cylinders.
A higher -class concrete may be used in place of an indicated lower -class concrete if the higher -class concrete conforms to all the requirements of the indicated lower class, and if approved by the Department.
designs according to ACI 211.2. Design lightweight c ement concrete to have a range of Equilibrium Density of 110 pounds per cubic feet to 117 pounds per cubic feet with a target of 115 pounds per cubic feet, when tested according to ASTM C567. Supply the following information to the District Materials Unit at least two weeks before conducting trial mixes:
• Approximate absolute vol ume of coarse aggregate (cubic feet )
• Suggested c oarse aggregate factor (CAF) (pounds per cubic yard)
• Oven- dry loos e weight of coarse aggregate (pounds per cubic feet )
• Specific gravity factor
• Percent absorption
Store and use lightweight aggregates in a stable, uniform, saturated condition to ensure the aggregate, if batched, is at a moisture greater than saturated surface dry (SSD). Us e the same source of aggregates and mix design throughout the entire project. Plastic densit