870 Page 525870 CONCRETE JOINT SEALER
870.1REQUIREMENTS
A.Hot Poured Elastic Joint Sealer: The sealant will conform to the requirements of ASTM D6690 Type IV or be on the Department’s Approved Products List for joint sealants for asphalt over long jointed concrete pavement. Hot poured elastic joint sealer meeting the requirements of ASTM D6690 Type IV will not weigh more than 9.35 pounds per gallon. Test methods will conform to ASTM D5329, except the fine aggregate used in preparing the concrete test blocks will conform to Section 800. The Contractor will furnish a Certificate of Compliance for hot poured elastic joint sealer not listed on the Department’s Approved Products List. B.Low Modulus Silicone Sealant: Low modulus silicone sealant will be furnished in a one-part silicone formulation. The sealant must be on the Department’s Approved Products List and must meet the following requirements: Test Limit Test Method Tack Free Time 20-75 minutes MILS 8802 Specific Gravity 1.010-1.515ASTM D792 (Method A) Durometer Hardness Type A: [Cured 7 days at 77°F ±3° and 45% to 55% R.H.]10-25 0°F ASTM D2240 Tensile Stress: [150% elongation, 7 days at 77°F ±3° and 45-55% R.H.]45 psi maximum ASTM D412 (Die C) Elongation: [7 day cure at 77°F ±3° and 45- 55% R.H.]1000% minimum ASTM D412 (Die C) Shelf Life6 month minimum from date of manufacture Ozone and Ultra Violet ResistanceNo chalking, cracking or bond loss after 5000 hours Movement Capability and Adhesion [ 7 day cure in air 77°F ±3°]No adhesive or cohesive failure, *1 all 3 specimens must exceed 500% extension at 0°F Bond to Concrete Mortar Concrete Briquettes [air cured 7 days at 77°F ±3°]50 psi minimum 0°F AASHTO T 132*2 *1Prepare the specimens using 1" x 2" x 3" concrete blocks made in accordance with ASTM D 5329, except the fine aggregate will conform to Section 800. A sawed face will be used for bond surface. Seal 2 inches of block leaving 1/2 inch on each end of specimen unsealed. The depth of sealant will be 3/8 inch and the width 1/2 inch. Subject the sealant to movement at a rate of 2 inches per minute until failure. *2Briquettes molded in accordance with AASHTO T 132 sawed in half and bonded with approximately 10 mils of sealant and tested using clips meeting AASHTO T 132. Briquettes will be dried to constant weight in oven 100°C ± 5°. They will be tested in tension at a loading rate of 0.3 inches per minute. The backer rod will be a non-moisture absorbing, closed cell, resilient material meeting the requirements of ASTM D5249 approximately 25% larger in diameter than the width of the joint to be sealed. The backer rod will be compatible with the sealant and no bond or reaction will occur between the rod and the sealant. 871 Page 526871 ASPHALT CONCRETE CRACK SEALANT
871.1REQUIREMENTS
A.Asphalt Concrete Crack Sealant Type IV: The sealant will conform to the requirements of ASTM D6690 Type IV. The sealant material will not weigh more than 9.35 pounds per gallon. Only products that meet the above requirements and have performed satisfactorily based on Department analysis may be used. A listing of acceptable products meeting ASTM D6690 Type IV requirements may be obtained from the Department's Approved Products List. Products on the Department’s Approved Products List for joint sealant for asphalt over long jointed concrete pavement may also be used. The blocking medium will be an inert, compressible material which is compatible with the sealant. B.Asphalt Concrete Crack Sealant Type IV Modified: The sealant will conform to the requirements of ASTM D6690 Type IV except as modified below. The sealant material will not weigh more than 9.75 pounds per gallon. Resilience % will be between 30 – 60%. Only products that meet the above requirements and have performed satisfactorily based on Department analysis may be used. A listing of acceptable products meeting ASTM D6690 Type IV Modified requirements may be obtained from the Department's Approved Products List. Products on the Department’s Approved Products List for joint sealant for asphalt over long jointed concrete pavement may also be used. The blocking medium will be an inert, compressible material which is compatible with the sealant.