for Highway Construction Page 432 of 71 5 SECTION 568 – ELASTOMERIC CONCRETE HEADER
568.01 Description.
Provide and install elastomeric concrete headers in prepared blockout areas as specified. Include the collection and disposal of waste debris.
568.02 Materials.
Provide elastomeric concrete that consists of a field- mixed, 2- part polyurethane material and pre- graded aggregate mix; the Department does not allow epoxy -based materials. Provide a manufacturer’s certification that attests the proposed materials are pre -tested and meets this specification.
A.Elastomeric Concrete. Provide ambient cure material, 100 percent solids, 2- component polyurethane with pre- graded aggregate mix exhibit ing the physical properties listed in Tables 568.02- 1 and 568.02- 2. When properly mixed and poured, the elastomeric concrete cures rapidly, flows and fills voids, spalls, or irregularities to form a monolithic unit. Table 56 8.02- 1 – Elasto meric Cured Binder Physical Properties Test Method Minimum Requirement Tensile Strength ASTM D638 1,000 psi Ultimate Elongation ASTM D638 150% Tear Resistance ASTM D624 80 lb/in for Highway Construction Page 433 of 71 5 Table 568.02- 2 – Elastomeric Cured Binder and Aggregate Physical Properties Test Method Minimum Requirement Compressive Strength ASTM D695 2,000 psi Resilience @ 5% deflection ASTM D695 90% Wet Bond Strength to Concrete Note 1 250 psi Impact Resistance @ - 20 °F Note 2 No cracks Durometer Hardness ASTM D2240 50 Note 1: Saw briquette in half so that cut surface area equals approximately 1 square inch. Ensure mortar briquette conforms to ASTM C190. Place briquette in mold and cast elastomeric conc rete against sandblasted surface. Submerge specimen in room temperature water for 7 calendar days. Test specimen to failure using a Riehle Briquette Tester. Failure can occur anywhere within the test specimen. Note 2: Cast 2.5- inch diameter and 0.375- inch thick disc test specimens then condition for 4 hours at test temperature. Drop a 1 pound steel ball onto the center of the specimen through a plastic tube from a height of 7 feet.
B.Bonding Agent. Provide manufacturer’s 2- component, 100 percent solids bonding agent. Apply bonding agent to the sides and base of the preformed concrete blockout before elastomeric concrete placement. Store, mix, and apply in accordance with the manufacturer’s safety data sheet and written instructions. Identify liquid components by the following information: Part A – Resin Color: Clear Part B – Activator Color: Tan Submit certified test results meeting the requirements in Tables 568.02- 1 and 568.02 -2 for the proposed products for approval before use.
568.03 Construction Requirements.
Meet with the Engineer and discuss the method of installation before performing the work pertaining to the elastomeric concrete headers. Ensure a qualified manufacturer's representative is onsite during the initial installation to meet with the Contractor and the Engineer, to train the Cont ractor in mixing and placement procedures, and to ensure the installation procedures are in accordance with the manufacturer's warranty requirements. Ensure the concrete blockout has cured for 7 calendar days and has reached a minimum compression strength of 3,000 psi before placing elastomeric concrete. Sandblast and vacuum the blockout surfaces and immediate surrounding concrete area to remove dirt, dust, sand, oil, grease, paint , corrosion deposits , laitance, and bond- inhibiting materials immediately before placing the elastomeric concrete. Prime the substrate surface as specified by the manufacturer and ensure joint gap is as specified on the plans before placing the elastomeric concrete . Mix and place the elastomeric concrete in accordance with the manufacturer’s instructions and as specified. Provide the Engineer with 1 set of the manufacturer’s instructions at least 1 week before the placement begins. Install the elastomeric concrete when the temperature is at least 45 F and rising. for Highway Construction Page 434 of 715 568.04 Method of Measurement. The Engineer will measure acceptably completed work by the cubic yard.
568.05 Basis of Payment .
The Department will pay for accepted quantities at the contract unit price as follows: Pay Item Pay Unit Elastomeric Concrete Header ................................................................. CY Removal of existing expansion joint material within designated blockout areas and expansion joint seal installation are covered in other contract pay items . 570-573 for Highway Construction Page 435 of 715 SECTION 569 – REMOVAL OF EXPANSION JOINT
569.01 Description.
Remove existing joint material consisting of elastomeric concrete, steel armor angles, and concrete within the removal limits specified.
569.02 Materials.
Not specified.
569.03 Construction Requirements.
Before starting work, obtain approval for the appropriate joint removal methods and equipment. Remove steel armor angles and concrete within the proposed blockout so the concrete is not damaged beyond the limits. Use jackhammers with a nominal rating of 15 pounds or less and held at an angle 45° or less from the sur face of the slab to remove the existing concrete within the new nosing limits specified. Notify the Engineer immediately if unsound concrete is encountered beyond the removal depth. Repair concrete overbreak or other damage outside the lim its specified at no additional cost to the Department.
569.04 Method of Measurement.
The Engineer will be measure acceptably completed work by the foot.
569.05 Basis of Payment .
The Department will pay for accepted quantities at the contract unit price as follows: Pay Item Pay Unit Removal of Expansion Joint ................................................................... FT Removed materials are the Contractor’s property and must be properly disposed.
Source: Idaho Standard Specifications for Highway Construction, 2023 Edition. Pages 468–470 of 768.