2017-005B - Laserfiche WebLink

Home Browse Search

i release agent that will contaminate, degrade, or alter the characteristics of the asphalt mix or is hazardous or detrimental to the environment. Petroleum derivatives (such as diesel fuel), solvents, and any product that dissolves asphalt are prohibited. Provide each truck with a tarpaulin or other waterproof cover mounted in such a manner that it can cover the entire load when required. When in place, overlap the waterproof cover on all sides so it can be tied down. Cover each load during cool and cloudy weather and at any time it appears rain is likely during transit with a tarpaulin or waterproof cover. Cover and tie down all loads of friction j course mixtures. 334-5.5 Preparation of Surfaces Prior to Paving: 334-5.5.1 Cleaning: Clean the surface of all loose and deleterious material by the use of power brooms or blowers, supplemented by hand brooming where necessary. 334-5.5.2 Patching and Leveling Courses: As shown in the plans, bring the existing surface to proper grade and cross-section by the application of patching or leveling courses. 334-5.5.3 Application over Surface Treatment:Where an asphalt mix is to be placed over a surface-treatment, sweep and dispose of all loose material from the paving area. 334-5.5.4 Tack Coat: Use a rate of application as defined in Table 334-5. Control the rate of application to be within plus or minus 0.01 gallon per square yard of the target application rate. The target application rate may be adjusted by the Engineer to meet specific field'conditions. Determine the rate of application as needed to control the operation. When using PG 52-28, multiply the target rate of application by 0.6. Table 334-5 Tack Coat Application Rates Asphalt Mixture Type Underlying Pavement Surface Target Tack Rate al/ d2 Newly Constructed Asphalt Layers 0.03 minimum Base Course, Structural Course, Milled Surface or Oxidized and 0.06 Dense Graded Friction Course Cracked Pavement Concrete Pavement 0.08 334-5.6 Placing Mixture: 334-5.6.1 Alignment of Edges: With the exception of pavements placed adjacent to curb and gutter or othertrue edges, place all pavements by the stringline method to obtain an-accurate, uniform-alignment of the pavement-edge. -Control--the unsupported pavement edge to ensure that it will not deviate more than plus or minus 1.5 inches from the stringline. 334-5.6.2 Rain and Surface Conditions: Immediately cease transportation of asphalt mixtures from the plant when rain begins at the roadway. Do not place asphalt mixtures while rain is falling, or when there is water on the surface to be covered. Once the rain has stopped and water has been removed from the tacked surface to the satisfaction of the Engineer and the temperature of the mixture caught in transit still meets the requirements as specified in 334-5.3, the Contractor may then place the mixture caught in transit. 01025-40 Technical Specifications F:\Public Works\ENGINEERING DIVISION PROJECTS\1123 43rd Ave Sidewalk Improvements 26th St.to Airport Dr West\Admim\bid documents\Master Contract Documents\Technical Specifications.doc