PORTLAND CEMENT CONCRETE PRODUCTION SECTION 1022 664 D. Permeability: AASHTO T277 , cured in accordance with the Accelerated Moist Curing Method.
E.Making and curing concrete test specimens: AASHTO T23
F.Unit weight: AASHTO T121
G.Compressive strength of concrete: AASHTO T22
1022.14 Mix Temperature Limitations.
A.Measure all temperatures at the point of placement.
B.The maximum allowable temperature for Class D concrete for bridge decks is 85 degrees F.
C.The maximum allowable temperature for Rapid -set concrete is 95 -degrees F.
D.The maximum allowable temperature for all other classes of concrete is 90 degrees F.
E.The minimum allowable temperature for Rapid -set concrete is 70 -degrees F.
F.The minimum allowable temperature for all other classes of concrete is 50 degrees F.
G.Take appropriate actions in accordance with ACI 318 recommendations for hot weather concrete when batch temperatures at the mixing plant reach 6 degrees F below the maximum allowed for the class of concrete produced.
H.Take appropriate actions in accordance with ACI 306 recommendations for cold weather concrete when batch temperatures at the mixing plant reach 6 degrees F above the minimum allowable for the class of concrete produced.
1022.15 Delivery Time of Concrete Batches.
A.The maximum allowable elapsed time between the introduction of the mix water and the final placement of the concrete is 45 -minutes for non -agitating transport vehicles and 60 -minutes for agitating transport vehicles.
B.Delivery time restrictions may be extended with the use of approved water reducing/retarding admixtures, set retarding admixtures, and/or replacement of a portion of the Portland cement content with fly ash cement or GGBFDS cement.
C.The interval between successive loads cannot exceed the lesser of 20 -minutes, or if the surface of the previous load exhibits signs of setting and cannot be mobilized using mechanical concrete vibrators.
1022.16 Additional Self -Consolidating Concrete Requirements.
A.The Department will allow use of self -consolidating concrete on precast and prestress applications with approval of the engineer.
B.Self-consolidating concrete is to conform to all requirements within Section 1022 for the class of concrete specified in addition to the requirements listed in Table 1022. 16-1. Table 1022.16 -1 Self -Consolidating Concrete Requirements Property Test Method Requirement Slump flow ASTM C1611 20 to 30 but within +/ - 3 inches of target slump
Source: Delaware Standard Specifications for Road and Bridge Construction, 2025 Edition. Pages 674–674 of 779.