10-53 more than 0.007 ounces per square inch. Do not use curing compound until the applicable
tests have been performed for each batch and has been approved by the Engineer. The curing compound shall be Type 2, white pigmented, except where clear type is required for a particular application, the curi ng compound shall be Type 1D, clear or translucent with fugitive dye. Deliver curing compound in the manufacturer ’s original clean, sealed containers. Legibly mark each container with the name of the manufacturer, the name of the compound, the type of com pound, the manufacturer ’s batch number, the date of manufacture and the manufacturer ’s recommended shelf life. Do not use curing compound that has been in storage for more than one year from the date of manufacture or more than the manufacturer ’s recommend ed shelf life, whichever is less.
B.Test Procedures Curing compound will be tested in accordance with ASTM C309, except the size of molds for making test specimens will be approximately 5.5 inches in diameter by approximately 1 inch deep, or any other size s elected by the Engineer. 1026 -3 POLYETHYLENE FILM Polyethylene film shall meet ASTM C171 for white opaque polyethylene film, except that when tested for moisture retention efficiency the loss shall not be more than 0. 007 oz./sq.in of surface area. 1026 -4 WATER All water used for curing concrete shall meet Article 1024 -4 and Table 1024- 2. Water from wells, streams, ponds or public water systems may be used. 1026 -5 BURLAP Burlap shall meet AASHTO M 182. Any class of burlap will be acceptable. Use new burlap or burlap that has been used for no purpose other than curing concrete. New burlap shall be free from starch, filler or other substances added during manufacture, or shall be washed to remove such substances before use. 1028 -1 JOINT FILLER Provide a nonbituminous type joint filler that meets AASHTO M 153 for Type s I, II or III, or a bituminous type that meets AASHTO M 213. Furnish a Type 3 material certification in accor dance with Article 106 -3 with each lot of the joint material supplied to each project. 1028 -2 HOT APPLIED JOINT SEALER Provide a hot applied joint sealer listed on the NCDOT APL, that conforms to ASTM D6690 . Products must be current with the applicable AASHTO Product Evaluation & Audit Solutions workplan to remain on the NCDOT APL. Furnish a Type 3 material certification in accordance with Article 106 -3 for each lot of the joint sealer supplied to each project. 1028 -3 LOW MODULUS SILICONE SEALANT Provide a cold applied, single component, chemi cally curing low modulus silicone sealant from the NCDOT APL . Products must be current with the applicable AASHTO Product Evaluation & Audit Solutions workplan to remain on the NCDOT APL. Acid cure sealants are not acceptable for use on Portland cement concrete. Bond breakers shall meet Article 1028 -4.
10-54 (A) Silicone Sealant Types
1.Type NS A non- sag silicone for use in sealing horizontal and vertical joints in Portland cement concrete pavements and bridges. Tooling is required.
2.Type SL A self-leveling silicone used to seal horizontal joints in Portland cement concrete pavements and bridges. Tooling is not normally required.
B.Requirements TABLE 1028 -1 PHYSICAL PROPERTIES OF SEALANT Property Requirement Test Method Peel Minimum of 20 lb/in of width with at least 75% cohesive failure ASTM D903 bonded on concrete block Movement Capability and Adhesion No adhesive or cohesive failure after 10 cycles of test movements of +100% (extension) and –50% (compression) ASTM C719 Silicone sealant shall meet the Table 1028 -1, ASTM D5893. Furnish a Type 3 material certification in accordance with Article 106- 3 for each lot of joint sealer material supplied to each project. Deliver each lot of sealant in containers plainly marked with the manufacturer ’s name or trademark, lot number and date of manufacture. 1028 -4 BOND BREAKER Install silicone sealant over a bond breaker to prevent the sealant from bonding to the bottom of the joint. Use bond breakers that do not stain or adhere to the sealant and are chemically inert and resistant to oils. Furnish a Type 3 material certification in accordance with
Article 106 — 3 for each lot of bond breaker material supplied to each project.
A.Type L Type L backer rod is a closed -cell expanded polyethylene foam backer rod. Use this backer rod in roadway and bridge joints and with Type NS silicone only. Use Type L backer rod that complies with Table 102 8-2.
B.Type M Type M backer rod is a closed -cell polyolefin foam backer rod which has a closed- cell skin over an open cell core. Use this backer rod in roadway and bridge joints with both silicone sealant types. Use Type M backer rod that complies with Table 102 8-2.
Source: North Carolina Standard Specifications for Roads and Structures, 2024 Edition. Pages 469–470 of 857.