428 SECTION 822
822.01 General
Submit a Certificate of Compliance for the penetrating water repellent. Provide a penetrating water repellent treatment solution that consists of an organosilicon compound dissolved in a solvent carrier that, when applied, produces a hydrophobic surface covalently bonded to concrete. Use an Alkyl -Alkoxysilane organosilicon compounds: Provide a solution meeting the following requirements: - Solvent carrier leaves less than 1 pe rcent residue upon evaporation; - Contains 100 percent active solids; - Certified to meet or exceed the performance criteria listed below based on a single application of the solution according to the manufacturer’s recommended rate of coverage; - Does not stain, discolor, or darken concrete; - Application does not alter the surface texture or form a coating on concrete surfaces; - Compatible with the use of special surface finish texture coatings as specified; and - Treated concrete is surface dry a maximum of 4 hours after application.
822.02 Testing
Provide a repellent that, when applied to concrete meets the following requirements:
A.Absorption. Test Duration Max. Absorption Method Water Immersion 48 hours 1% by weight ASTM C 642 50 days 2% by weight ASTM C 642
B.Chloride Ion Penetration.
C.Scaling Resistance to Deicing Chemicals. Test Duration Max. Absorption Method Salt Water Ponding1 90 days 0.75 lb per yd3 AASHTO T 259 Depth: 0.5 inch to 1 inch AASHTO T 260 1 Based on non- abraded specimens. Test Duration Visual Rating Method Salt Water Ponding 50 Cycles 0 at 25 cycles ASTM C 672 ≤ 3 at 50 cycles ASTM C 672 Section 826 429 SECTION 826 JOINT MATERIALS
826.01 General
Submit a Certificate of Compliance for the joint sealant. Beginning in 10/1/2020 submit the NTPEP testing results for the joint sealant along with the certificate of compliance. Submit a copy of the manufacturer’s recommendations pertaining to the heating and application of the joint sealant material to the Engineer before the beginning of work. Follow the manufacturer’s recommendations. Do not allow the sealer in the field applic ation equipment to exceed the safe heating temperature recommended by the manufacturer. Do not heat any given quantity of material at the pouring temperature for more than six hours and do not reheat the material. Do not place material if the temperature i s below the manufacturer’s recommended minimum application temperature. Do not mix different manufacturer’s brands or different types of sealant together. Place sealant materials when the air temperature is above 40°F.
826.02 Materials
A.Hot Applied Joint Sealant.
1.Type I. Provide joint sealant that meets the requirements of ASTM D 6690, Type I, with the following modifications: − The sealant shall consist of a blend of asphalt cement and vulcanized crumb tire rubber. The asphalt cement shall meet the requirements of AASHTO M 226; − The minimum softening point is revised to 88°C; and − The sealant shall have a specific gravity between 1.13 and 1.17. Provide crumb rubber at a rate of at least 12 percent of the total weight of sealant mixture. Provide crumb rubber that is free of deleterious material and that meets the gradation in Table 826-01. Calcium carbonate may be added to mixture, but the maxim um quantity shall not exceed 4 percent of the weight of the crumb rubber. Table 826 -01 Sieve Size Percent Passing No. 8 100 No. 10 95 – 100 No. 30 0 – 20 No. 50 0 - 5
2.Type IV. Provide joint sealant that meets the requirements of ASTM D 6690, Type IV, except the penetration value requirement is revised to 120 to 150.
Source: North Dakota Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 463–463 of 550.