413 SECTION 808
808.01 Air -Entraining Admixtures
Use air -entraining admixtures that meet the requirements of AASHTO M 154.
808.02 Chemical Admixtures
Chemical admixtures may be used, but must meet the requirements of AASHTO M 194 and be classified as Type A under ASTM C 494. Other types of admixtures may be used, but must be approved by the Engineer before use. Section 810 414 SECTION 810 CONCRETE CURING MATERIALS
810.01 Curing Materials
A.Burlap Cloth. Use burlap cloth that meets the requirements of AASHTO M 182.
B.Liquid-Membrane-Forming Compounds.
1.Type 2. Supply curing compound that meets the requirements of ASTM C 309 Type 2.
2.Type 2, Class B. Supply curing compound that meets the requirements of ASTM C 309 Type 2, Class B and meets the requirements of Table 810-01. Table 810 -01 Properties Value Total Solids, % by weight of compound 42 minimum % Reflectance in 72 hours 65 minimum Loss of Water, kg/m2 in 24 hours 0.15 maximum Loss of Water, kg/m2 in 72 hours 0.4 maximum Settling Test (NDDOT 6) 2 maximum
V.O.C. Content, g/L 350 maximum Use a resin that is 100 percent poly -alphamethylstyrene.
3.Curing Compound for Pigmented Concrete. Use a curing compound when curing pigmented concrete that meets the requirements of ASTM C 309 Type 1-D.
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Source: North Dakota Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 448–448 of 550. View official source ↗