414 SECTION 810
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. Section 812 415 SECTION 812 WATER
812.01 Water
Use water that is clean and free of oil, acid, alkali, organic matter, and other substances detrimental to the finished product. If the water source is known to be potable, no testing will be required. If the potability of the water is unknown, the Engineer will test the water according to the requirements of Table 812-01. Where the source of water is relatively shallow, enclose the intake to exclude silt, mud, grass, or other solid materials. Table 812-01 Test Requirement Test Method Total Solids by Mass < 2500 ppm ASTM C 1603 Sulfate < 3000 ppm ASTM D 516 Chloride < 500 ppm ASTM D 512 pH from 6.0 to 8.6 If one or more test shown in Table 812-01 exceed the requirements, with the exception of the pH, then the water source is not acceptable. If test results show a pH value less than 6.0 or more than 8.6, the Engineer will determine the compressive strength of mortar mixed using the sampled water in accordance with AASHTO T 106. The 7 day compressive strength will be compared to results obtained using distilled water in place of the sampled water. If the sampled water specimens achieve less than 90 percent of the strength of the distilled water specimens, do not use the water source.
Referenced in this section
CONCRETE CURING MATERIALS in other states
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Source: North Dakota Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 449–449 of 550. View official source ↗