Specifications include, but are not limited to: CRACK SEALANT o The crack sealant shall be a hot-applied rubberized asphalt, meeting ASTM D3405 as recommended to fill cracks from 1/4 inch to 3/4 inch wide. At a minimum, the sealant material shall meet or exceed the following requirements. Color Black Solids 63% Minimum Rubber 6.5% Minimum Asphalt 45% Minimum Approved products: 1. Crafco – Roadsaver 222, 515 or 535 2. P&T Products – Dura-Fill 3405 LM Surface Preparations: 1. Route and clean the cracks with high-pressure air to provide a clean, dry reservoir to receive the new materials. 2. Treat the cracks with a heat lance to prevent vegetation growth. 3. Apply the crack sealant filing the cracks from bottom to top prior to placing the aggregate seal coat. 4. Over-band the crack areas 1” beyond the crack edges on both sides, and the over-band materials shall be flush with the pavement surface. 5. Install the crack filler prior to the aggregate seal coat application. Application: 1. Completely fill or seal the cracks and allow them to harden. The material shall be flush with the pavement surface. Remove any excess materials. 2. Apply the materials on a warm, dry surface when the air temperature is between 45 degrees F and 90 degrees F and rain is not forecast or imminent. 3. Apply sand or tissue paper over the crack sealant material to minimize the potential for tracking. 4. Protect the area from vehicular and pedestrian traffic for a minimum of 24 hours, or as recommended by the manufacturer. AGGREGATE SEAL COAT The asphalt shall be liquid asphalt a cationic emulsified asphalt CRS-2 or CRS-2P polymer modified emulsion. Aggregate Classification: Class A: Crushed quarry or mine traprock (basalt, diabase, gabbro, or other related igneous rock types), quartzite, or granite. Other igneous or metamorphic quarry or mine rock may be used only with specific written approval of County Staff The aggregate shall meet MN/DOT 3127 FA-2 grading and/or WIDOT Section 475 as listed below. Sieve Size Percent Passing by Weight 1/4 inch 100 No. 4 85 - 100 No. 8 10 - 40 No. 16 0 - 10 No. 50 0 – 5 No. 100 0 – 1 5% maximum allowable shale content by weight Equipment: 1. Distributor: The distributor shall be computerized, designed, equipped, maintained, and operated so the material may be applied uniformly on variable widths of surface up to 18 feet at readily determined and controlled rates up to 2.0 gallons per square yard, with uniform pressure, and with an allowable variation from a specified rate not exceeding 0.02 gallons per square yard. The distributor shall include a tachometer, pressure gauges, accurate volume measuring devices or a calibrated tank, and shall be equipped with a power unit for the pump, and full circulation spray bars adjustable laterally and vertically. A hose and spray nozzle attachment shall be provided for applying material to areas inaccessible to the spray bar. 2. Aggregate Spreader: The spreader shall apply the cover aggregate with a computerized aggregate spreader capable of distributing the aggregate uniformly to the required width and at the designated rate, with the application sharply defined at the edges. 3. Pneumatic-Tired Roller: The roller shall be self-propelled, weighing not less than 200 pounds per inch of rolling width. 4. Sweepers: Provide a rotary power broom capable of cleaning the pavement surface prior to spraying the bituminous material and to also remove all the loose aggregate after the curing period is complete. Surface Preparation: 1. At the time of applying the bituminous material, the pavement surface shall be dry and clean, and all necessary repairs or reconditioning work shall have been completed as provided for in the contract. 2. Remove and dispose of objectionable foreign matter, including all vegetation, on the pavement surface. 3. In some areas of the parking lot, the existing pavement striping paint is becoming delaminated from the pavement surface. The loose paint should be removed from the pavement surface using sand blasting, soda blasting, grinding, or other acceptable means, without damaging the underlying pavement, prior to applying the seal coating materials. 4. Apply a releasing agent or protective covering to the utility covers prior to the application of the bituminous material. At completion, the utility covers shall be cleaned to expose their original surface. Application of the Bituminous Material: 1. The application of the bituminous material shall be governed by the porosity and surface texture of the existing pavement. 2. The bituminous material shall not be applied until the loaded aggregate spreader is on-site and ready to begin the application of the cover aggregate immediately, with sufficient truckloads of aggregate being at the site to cover the length of the anticipated applications of the bituminous material. 3. Apply the bituminous material at a rate of 0.15 to 0.25 gallons per square yard, based upon the anticipated traffic levels and aggregate size to ensure proper embedment. 4. The application shall produce a uniform and consistent film without ridges and skips. Adjustments to the spray bar and nozzles shall be made prior to the application of the bituminous material on the areas to be aggregate seal coated. 5. The temperature of the bituminous material at the time of the application shall be within the limits specified below: Cationic Emulsified Asphalt CRS-2P: 125 to 185 degrees F.
